Answer:
unknown
Explanation:
Psi communication: The term "Psi communication" was initially originated in an article named 'Mass Communication and Para-Social Interaction' during 1956 by Donald Horton, and is also denoted as "parasocial interaction". It is described as a phenomenon that involves "one-sided interaction" between people, encompassing the viewer knowing a specific celebrity well whereas the viewer himself or herself is being completely unknown for the celebrity in return.
In the question above, the given statement represents that the Psi communication is responsible for transforming via an unknown process as one of its members are considered as unknown of the transfer, so the correct answer would be "unknown process".
Six friends are at a pizzeria. They want to order enough pizza so that each person can eat at least 2/5 . start fraction, 2, divided by, 5, end fraction of a pizza. What is the minimum number of pizzas they should order?
Friend #1 gets at least 2/5 of a pizza.
Friend #2 gets at least 2/5 .
Friend #3 gets at least 2/5 .
Friend #4 gets at least 2/5 .
Friend #5 gets at least 2/5 .
Friend #6 gets at least 2/5 .
Sum . . . . . . . . . at least 12/5 of a pizza.
Simplify . . . . . . at least 2.4 pizzas.
-- If pizzas can be bought by the half, they should order at least 2-1/2 pizzas.
-- If only whole pizzas have to be ordered, then they should order at least 3 pizzas.
Answer:
3 pizza if your in khan! :D
Explanation:
Juanita, en medio de la cuarentena tuvo que salir de su casa por algunos artículos que necesitaba; utilizó su tapabocas y guantes, salió corriendo con velocidad de 3m/s a comprar, 3 kilogramos de arroz, dos litros de leche y 5 tapabocas. Para completar el total de las cosas, primero debe ir al supermercado que esta ubicado a 50 metros, en dirección 30 grados con respecto a la horizontal partiendo desde su casa, y de allí, salir para la droguería que se encuentra ubicada a 70 metros, dirección 150 grados desde el supermercado geográficamente con respecto a la horizontal. 1. Clasifique las cantidades escalares y las cantidades vectoriales del problema
Answer:
the scalar quantities in this exercise are: 3 kg rice, 2 liters of milk and 5 face masks, the rapides 3 m / s
the vector quantities are: the displacement to the supermarket and the drugstore
Explanation:
For this problem we are asked to find scalar quantities and vector quantities.
A scalar quantity is one that is described by a number with its units
A vector quantity is that described by a number (module), a direction and a sense, that is, they must be represented by a vector
the scalar quantities in this exercise are: 3 kg rice, 2 liters of milk and 5 face masks, the rapides 3 m / s
the vector quantities are: the displacement to the supermarket module 50 m directional 30º sense with respect to the horizontal.
The displacement to the drugstore modulo 70 m direction 150º with respect to the supermarket
A 100 Newton force applied to a machine lifts a 400 N object. What is the actual mechanical advantage of
this machine?
Answer:
m = 4
Explanation:
It is given that,
A 100 Newton force applied to a machine lifts a 400 N object.
We need to find the mechanical advantage of this machine.
The mechanical advantage of a machine is given by the ratio of output force to the input force.
Here, output force is 400 N and input force is 100 N
So, mechanical advantage becomes :
[tex]m=\dfrac{400}{100}\\\\m=4[/tex]
So, the mechanical advantage of this machine is 4.
The actual mechanical advantage of this machine will be:
"4".
ForceA force represents a pushing as well as pulling on such material or item caused by its contact with some other thing.
According to the question,
Input force = 100 N
Output force = 400 N
Now,
The mechanical advantage be:
→ m = [tex]\frac{Out. \ force}{Inp. \ force}[/tex]
By substituting the values, we get
= [tex]\frac{400}{100}[/tex]
= 4
Thus the above response is appropriate.
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A student decides to go to the kitchen for a late night snack. When opening the door, she notices the light from inside seem to cover more floor than the open door. Which wave behavior have they experienced?
a) Diffraction
b) Refraction
c) Reflection
d) Interference
Answer:
diffraction
Explanation:
Object B has a mass of 10 kg. Object B collides with another
object. If the momentum of object B after the collision is
18 kg.m/s 18 kg.m/s, its velocity is m/s.
Answer:
1.8m/s
Explanation:
We know that the momentum of an impact of a body is the mass times he velocity
M= mv
Given data
Mass m= 10kg
Momentum M= 18 kg.m/s
Velocity v=?
We can solve for velocity by submitting our given data in the momentum equation
18 = 10*v
v= 18/10
v= 1.8m/s
Answer: 1.8m/s
Explanation: bigger brain
A ray in glass arrives at the glass-water interface at an angle of 48° with the normal. The refracted ray, in water, makes a 72° angle with the normal. The index of refraction of water is 1.33. Then the ray in glass is redirected so its new angle of incidence is 37°. What is the new angle of refraction in the water? Show all work. (2 points)
An electromagnetic wave of frequency 2.30 × 10^14 Hz propagates in carbon tetrachloride with a speed of 2.05 x 10^8 m/s. What is the wavelength of the wave in carbon tetrachloride? Show all work and include units of measure. (2 points)
Based on the data in the graph provided, which value is closest to the index of refraction of quartz for extreme violet light of wavelength 400 nm? (1 point)
1.44
1.53
1.56
1.67
The index of refraction of medium 1 is 2.3 and the index of refraction for medium 2 is 1.6. What is the critical angle for light traveling within medium 1 toward medium 2? (1 point)
40°
14°
44°
70°
A ray of laser light strikes a glass surface at an angle θa = 22.5° to the normal. What is the angle θb of the refracted ray? Let the index of refraction for glass nb = 1.77. (1 point)
12.7°
12.5°
31.8°
10.1°
As explained by the theory of quantum electrodynamics, light is best described as _____. (1 point)
Both a wave and particles.
A wave, not particles.
Particles, not a wave.
Match the following types of electromagnetic waves with where they exist on the electromagnetic spectrum. (2 points)
1
2
3
4
a. Radio Waves
b. Infrared
c. Gamma Rays
d. X-Rays
Describe the difference(s) between electromagnetic waves and mechanical waves. Provide an example of each in your descriptions. (2 points)
A step-down transformer providing electricity for a residential neighborhood has exactly 2750 turns in its primary. When the potential difference across the primary is 5670 V, the potential difference at the secondary is 240 V. How many turns are in the secondary? Show all work. (2 points)
A circuit has 3 resistors, all connected in parallel. Let R1 = 4.0 Ω, R2 = 3.0 Ω, and R3 = 6.0 Ω. What is the equivalent resistance of the circuit? Show all work and include units of measure.
Answer:
hope this helps
...........
Along a horizontal line, from left, a point, a large giraffe labeled Object, a small giraffe labeled Image, a double concave lens centered on the line, another point on the line. A dotted orange line passes up and right through the first point, goes to the head of the large giraffe, turns solid, and passes through the lens to the label 2. A shorter orange line passes straight from the top of the large giraffe to the center of the lens. A Dotted green line runs straight from the left through the neck of the larger giraffe through the lens to a label 3 on the right side. A shorter green line runs from the top of the larger giraffe to the center of the top half of the lens and then as a dotted line to the second point. A solid blue line runs from the top of the large giraffe through the center of the lens to a label 1 right of and below the lens. In the diagram, the shape of the lens is and the image is .
Answer:
In the diagram, the shape of the lens is concave and the image is virtual
Explanation:
yes
Answer:
concave and virtual
Explanation:
Explanation:
The average force of a baseball is 18.9 N . It’s mass is 0.145kg fine the acceleration in m/s^2
Answer:
the acceleration is 130.3m/s²
Explanation:
Given data
Force F= 18.9N
Mass of ball m= 0.145kg
Acceleration a=?
Applying the Newton's second law of motion
"The rate of change of momentum of a body is proportional to the external force".
F=ma
a= F/m
a= 18.9/0.142
a= 130.3m/s²
The acceleration of the baseball is 130.35 [tex]m/s^2[/tex].
Given the following data:
Average force of a baseball = 18.9 NewtonMass of baseball = 0.145 KilogramsTo find the acceleration of the baseball, we would apply Newton's Second Law of Motion:
Mathematically, Newton's Second Law of Motion is given by this formula;
[tex]Acceleration = \frac{Force}{Mass}[/tex]
Substituting the given values, we have;
[tex]Acceleration = \frac{18.9}{0.145}[/tex]
Acceleration = 130.35 [tex]m/s^2[/tex]
Therefore, the acceleration of the baseball is 130.35 [tex]m/s^2[/tex].
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Write a nuclear equation to describe the neutron induced fission of u-235 to form xe-134 and sr-100. Determine how many neutrons are produced in the reaction.
Answer:
The nuclear equation is give as [tex]\ce{^{235}_{92}U} + \ce{^{1}_{0}n} \rightarrow \ce{^{134}_{54}Xe} + \ce{^{100}_{38}Sr} + 2 (\ce{^{1}_{0}n})[/tex]
The number of neutrons produced = 2
Explanation:
Since the reaction is a neutron induced fission of Uranium, a certain amount of neutron will be emitted with Xe - 34 and Sr - 100
Therefore the nuclear equation is given as:
[tex]\ce{^{235}_{92}U} + \ce{^{1}_{0}n} \rightarrow \ce{^{134}_{54}Xe} + \ce{^{100}_{38}Sr} + y (\ce{^{1}_{0}n})[/tex]
To get the value of y:
Sum of mass numbers at the reactant = Sum of mass numbers at the product
235 + 1 = 134 + 100 + y
y = 236 - 234
y = 2
Therefore, the nuclear equation above becomes:
[tex]\ce{^{235}_{92}U} + \ce{^{1}_{0}n} \rightarrow \ce{^{134}_{54}Xe} + \ce{^{100}_{38}Sr} + 2 (\ce{^{1}_{0}n})[/tex]
As seen from the equation above, the number of neutrons produced in the reaction = 2
The nuclear equation for the neutron-induced fission of U-235 to form Xe-134 and Sr-100 is 235U + 1n → 134Xe + 100Sr + xn. The number of neutrons produced in the reaction can vary, but it is typically two or three.
Explanation:The nuclear equation to describe the neutron-induced fission of U-235 to form Xe-134 and Sr-100 is:
235U + 1n → 134Xe + 100Sr + xn
Here, xn represents the number of neutrons produced in the reaction. The exact value of xn depends on the specific reaction and can vary. In general, the fission of U-235 produces two or three neutrons, each of which is capable of causing the fission of another nucleus.
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The force or push that causes electric charges to move is called
Answer:
electrostatic force
Explanation:
Electrostatic force is the force that exists between electric charges on stationary charged bodies
The threshold frequency in a photoelectric experiment is most closely related to the A) brightness of the incident light B) work function of the photoemissive metal C) area of the photoemissive metal D) thickness of the photoemissive metal
The correct option is "work function of the photoemissive metal". The threshold frequency in a photoelectric effect experiment is most closely related to the work function of the photoemissive metal, which is the amount of energy required to eject an electron from the metal's surface.
The threshold frequency in a photoelectric experiment is closely related to the work function of the photoemissive metal (Option B). The threshold frequency is a characteristic of a metal and represents the minimum frequency of incident light required to eject electrons from the metal surface. If the frequency of the incident light is below this threshold, no photoelectrons are ejected regardless of the light's intensity or any other factors, such as the area or thickness of the metal.
In the case of using a metal with a lower threshold frequency (Option 3), this would correspond to a photoemissive metal with a lower work function, allowing electrons to be ejected with lower frequency (and thus, less energetic) light. Conversely, if a metal with a higher work function is used (Option 4), photons with energy less than this work function would not eject electrons, as their energy would be insufficient to overcome the electron binding energy inherent to the metal.
g = 10 N/kg or 10 m/s2
A tennis ball of mass 0.2 kg drops from a height of 20 m. When it hits the ground, it bounces to a height of 14 m.
Describe what happens next
What was the Potential Energy (EP) of the ball before it fell?
What was the efficiency of the bounce?
How fast will Danielle be moving as she reaches the bottom of the hill?
Answer:
a) [tex]U_{g} = 40\,J[/tex], b) [tex]\eta = 70\,\%[/tex], c) [tex]v = 20\,\frac{m}{s}[/tex]
Explanation:
a) The initial potential energy is:
[tex]U_{g} = (0.2\,kg)\cdot \left(10\,\frac{m}{s^{2}} \right)\cdot (20\,m)[/tex]
[tex]U_{g} = 40\,J[/tex]
b) The efficiency of the bounce is:
[tex]\eta = \left(\frac{14\,m}{20\,m} \right)\times 100\,\%[/tex]
[tex]\eta = 70\,\%[/tex]
c) The final speed of Danielle right before reaching the bottom of the hill is determined from the Principle of Energy Conservation:
[tex]K = U_{g}[/tex]
[tex]U_{g} = \frac{1}{2}\cdot m \cdot v^{2}[/tex]
[tex]v = \sqrt{\frac{2\cdot U_{g}}{m} }[/tex]
[tex]v = \sqrt{\frac{2\cdot (40\,J)}{0.2\,kg} }[/tex]
[tex]v = 20\,\frac{m}{s}[/tex]
A 6,000-watt electric water heater is plugged into a 240-volt outlet and used for 0.75 hours. How much current runs through the water heater?
0.04 amps
19 amps
25 amps
33 amps
The current running through the water heater is found by dividing the power by the voltage. In this case, it works out to be 25 amps.
Explanation:To find the current, we use the formula for power in electrical circuits: Power = Voltage x Current. In this situation, the power is 6,000 watts, and the voltage is 240 volts. So to find the current, we only need to rearrange the formula to Current = Power / Voltage = 6000 / 240,
When calculating this, we find that the current is indeed 25 amperes. Therefore, when the electric water heater is used for 0.75 hours, it uses a current of 25 amps.
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You see an image of yourself in a mirror because light waves are A) diffracted. B) reflected back at you. C) refracted through air. D) refracted to a focal point.
Answer:
(b) reflected back at you
Explanation:
Answer:
B) Reflected back at you.
Explanation:
Because of the smooth surface light reflects and bounces back to you making you see a reflected image of your self.
Hope this helped! Good luck and stay safe!!
You used the right-hand rule to determine the z component of the angular momentum, but as a check, calculate in terms of position and momentum: what is xpy? what is ypx? therefore, what is the z component of the angular momentum of the child about location a?
In the case of x py, L is in the positive z-direction.
In the case of y px L the negative z-direction.
What is Angular momentum?
When The angular amount is defined by the relation
Then L = r x p
Then the bold are vectors, where r is the position vector and p is the linear amount vector.
When The module of this vector can be concentrated by the relation
After that L = r p sin θ
Although the direction of the vector L can be found by the right-hand rule where the thumb pinpoints in the direction of the displacement vector, When the fingers extended in the direction of the moment p which is the exact direction of speed, and also the palm ends in the direction of the angular momentum L
In the case x py
the thumb is in the x-direction, Then the fingers are extended in the direction, and also the palm is in the positive z-direction
In such the case y px
Therefore, the thumb is in the y-direction, the fingers are in the x-direction, the palm is in the negative z-direction
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The z-component of angular momentum can be found using the cross product of the position and momentum vectors. The formula Lz = xpy - ypx expresses this component, where x and y are position coordinates along the x and y axes, respectively, and px and py are the momentum components along those axes.
Explanation:The angular momentum L of a particle with respect to a point can be calculated as the cross product of the particle's position vector r and its linear momentum p. If we take x to be the position along the x-axis and py to be the component of the momentum along the y-axis, then xpy would represent the contribution of these components to the angular momentum around the z-axis. Similarly, if y is the position along the y-axis and px is the component of momentum along the x-axis, then ypx is also a contribution to the angular momentum around the z-axis.
However, according to the right-hand rule for cross products, the z-component of the angular momentum calculated from these components would be Lz = xpy - ypx, since the cross product is defined as r x p = (ypx - xpy)k, where k is the unit vector in the z-direction.
Elabora una tabla, como la del ejemplo, con los resultados obtenidos en los test que desarrollaste en actividades anteriores. Luego, responde: ¿qué indican esos resultados con respecto a tu condición física y cómo se relacionan con tu salud? A partir de tus respuestas, plantéate el reto de mejorar tu condición física manteniendo o mejorando tu rutina de ejercicios o la práctica permanente de actividad física.
Explanation:
Clear rendering reads;
"Make a table, like the one in the example, with the results obtained in the tests you carried out in previous activities. Then answer: What do these results indicate regarding your physical condition and how do they relate to your health? From your answers, consider the challenge of improving your physical condition by maintaining or improving your exercise routine or permanent practice of physical activity".
So the incomplete text above it seems you've been instructed to perform an experiment and then state your result/analysis.
True or Flase The fastest moving traffic on the expressway will be traveling in the right lane
I think this answer is False because i believe the right lane is the slowest lane you could be in.
The statement that the fastest moving traffic on the expressway is in the right lane is false. Slower traffic typically occupies the right lane, while faster traffic uses the left lanes. The right lane is generally for slower vehicles or those preparing to exit.
The statement "The fastest moving traffic on the expressway will be traveling in the right lane" is False. Typically, on an expressway or freeway, the right lane is designated for slower-moving traffic or for vehicles that are about to exit. The left lane is generally used for passing and faster-moving traffic.
For example, if you are driving at 60 mph in the right lane and another car is driving at 65 mph, that car will most likely be in the left lane to pass you. Therefore, the fastest-moving traffic will be found in the left lanes rather than the right lanes.
Can someone please help me with this pre ap physics question?
Answer:
they will be moving east and west, or perpendicular to particles of the wave.
Explanation:
Answer:
The answer is B: Perpendicular to the particles of the wave
Explanation:
What is the definition for Astrology?
Astrology is a belief system which posits that the positions and movements of celestial bodies (the Sun, Moon, and planets) can influence human affairs and natural phenomena. Astrological practices involve the creation of horoscopes, which are detailed charts calculated based on the exact time, date, and location of an individual's birth, with the intention of gaining insight into personality traits, relationships, and life events.
The origins of astrology are rooted in ancient civilizations and can be traced back thousands of years. Early forms of astrology were used by the Babylonians as a method for predicting seasonal shifts and interpreting celestial cycles as omens. Horoscopes, central to natal astrology, detail the positions of the planets within the zodiac at the moment of one's birth, aiming to provide guidance or predictions. Critiques of astrology as a scientific practice point to a lack of empirical evidence and reproducibility, the Forer effect (subjects giving high accuracy ratings to vague and general personality descriptions), and the logical inconsistencies within astrological traditions which discredit its validity as a science.
Calculate the amount of heat needed to raise 1.0 kg of ice at -20 degrees Celsius to steam at 120 degree Celsius
Answer:
801.1 kJ
Explanation:
The ice increases in temperature from -20 °C to 0 °C and then melts at 0 °C.
The heat required to raise the ice to 0 °C is Q₁ = mc₁Δθ₁ where m = mass of ice = 1 kg, c₁ = specific heat capacity of ice = 2108 J/kg°C and Δθ₁ = temperature change. Q₁ = 1 kg × 2108 J/kg°C × (0 - (-20))°C = 2108 J/kg°C × 20 °C = 4216 J
The latent heat required to melt the ice is Q₂ = mL₁ where L₁ = specific latent heat of fusion of ice = 336000 J/kg. Q₁ = 1 kg × 336000 J/kg = 336000 J
The heat required to raise the water to 100 °C is Q₃ = mc₂Δθ₂ where m = mass of ice = 1 kg, c₂ = specific heat capacity of water = 4187 J/kg°C and Δθ₂ = temperature change. Q₃ = 1 kg × 4187 J/kg°C × (100 - 0)°C = 4187 J/kg°C × 100 °C = 418700 J
The latent heat required to convert the water to steam is Q₄ = mL₂ where L = specific latent heat of vapourisation of water = 2260 J/kg. Q₄ = 1 kg × 2260 J/kg = 2260 J
The heat required to raise the steam to 120 °C is Q₅ = mc₃Δθ₃ where m = mass of ice = 1 kg, c₃ = specific heat capacity of steam = 1996 J/kg°C and Δθ₃ = temperature change. Q₃ = 1 kg × 1996 J/kg°C × (120 - 100)°C = 1996 J/kg°C × 20 °C = 39920 J
The total amount of heat Q = Q₁ + Q₂ + Q₃ + Q₄ + Q₅ = 4216 J + 336000 J
+ 418700 J + 2260 J + 39920 J = 801096 J ≅ 801.1 kJ
How is mechanical energy calculated?
A. by adding potential energy and kinetic energy
B. Oby subtracting potential energy from kinetic
energy
C. by multiplying potential energy and kinetic energy
D. by dividing potential energy by kinetic energy
Answer: [A] "by adding potential energy and kinetic energy"
Explanation: Mechanical Energy = Potential Energy + Kinetic Energy
Answer: d
Explanation:
Danielle has a mass of 80 kg and is sitting in a wagon at the top of a 20-m high hill. She slides down. a) How much kinetic energy will she have at the bottom of the hill?
Answer:
E = 15680 J
Explanation:
We have,
Mass of Danielle is 80 kg
He is at the top of hill at a height of 20 m
As she slides down at the bottom of the hill, its potential energy gets converted to its kinetic energy. So, the kinetic energy at the bottom of the hill is :
[tex]E=mgh\\\\E=80\times 9.8\times 20\\\\E=15680\ J[/tex]
So, she will have 15680 J of kinetic energy at the bottom of the hill.
What is the current understanding about light? Light behaves as________
A.neither particles nor
waves
B.particle
C.waves
D.both particles and waves
Answer:
D
Explanation:
Light travels in waves. It is also a particle. The dual nature of light as "both a particle and a wave" has been proved, its essential theory was further evolved from electromagnetics into quantum mechanics. Einstein believed light is a particle (photon) and the flow of photons is a wave.
A heat engine is a device that uses _____to produce useful work.
A heat engine is a device that uses heat to produce useful work.
Answer:
Heat
Explanation:
A student wants to determine whether an unknown solid is an ionic compound. He puts some in water and finds that it does not dissolve. He says that this proves the solid is ionic. Which best evaluates the student's reasoning?
He is incorrect, because water can dissolve ionic solids.
The test proves nothing, because water dissolves all solids.
He is correct, because polar liquids cannot dissolve ionic solids.
The test proves nothing, because it only shows that the solid is a compound.
The correct evaluation of the student's reasoning is: He is incorrect, because water can dissolve ionic solids.
To evaluate the solubility of a solid in water as a means of determining its ionic nature, one must consider the interactions between the solid and the water molecules. Water is a polar solvent, meaning it has a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom. This polarity allows water to solvate ions by surrounding cations with its oxygen side and anions with its hydrogen side. As a result, water can often dissolve ionic compounds by breaking the ionic bonds and stabilizing the individual ions in solution.
However, the solubility of ionic compounds in water is not solely dependent on their ionic nature. It also depends on the lattice energy of the solid and the hydration energy of the ions. Some ionic compounds have very high lattice energies, meaning the ions are held together very strongly in the solid state, which can prevent them from dissolving in water if the hydration energies are not sufficient to overcome the lattice energy.
Therefore, the student's conclusion that the solid is not ionic simply because it does not dissolve in water is incorrect. The inability of the solid to dissolve could be due to a high lattice energy rather than the absence of an ionic bond. To truly determine the nature of the solid, additional tests such as checking for conductivity when the solid is dissolved in other solvents or performing a flame test would be necessary.
The other options can be evaluated as follows:
- The test proves nothing, because water dissolves all solids: This statement is incorrect because not all solids dissolve in water. There are many examples of covalent solids that do not dissolve in water.
- He is correct, because polar liquids cannot dissolve ionic solids: This statement is incorrect because polar liquids like water can dissolve ionic solids, provided that the hydration energies are sufficient to overcome the lattice energy.
- The test proves nothing, because it only shows that the solid is a compound: This statement is partially correct in that the test alone does not prove the solid is ionic or covalent. However, it is misleading to say that the test only shows that the solid is a compound, as the test does not provide information about the compound's bonding nature.
In conclusion, the student's reasoning is flawed because the insolubility of a solid in water does not conclusively prove that the solid is not ionic. Further tests are required to determine the nature of the solid's chemical bonding.
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___________ describes the specific genetic makeup of a living thing and cannot be observed.
Genotypes describe the specific genetic makeup of a living thing and cannot be observed.
Genotypes represent the combination of alleles or genes that an organism possesses for a particular trait or set of traits. They are responsible for determining the inherited characteristics and potential traits that an organism can exhibit.
They can vary for different traits within an individual organism or across different individuals within a species. They play a fundamental role in genetics and inheritance, as they determine the genetic information that is passed from one generation to the next.
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Given that a ball has a mass of 0.16kg calculate it's weight take gravity 10N/kg
Answer:
1.6 N
Explanation:
Weight, W = mg where m = mass = 0.16 kg and g = 10 N/kg
W = mg = 0.16 kg × 10 N/kg = 1.6 N
a car driver takes a total of two hours to make a journey of 75 km. She has a coffee
of half an hour and spends a quarter of an hour stationary in a traffic jam. At what
erage speed must she travel during the rest of the time if she wants to complete the
journey in the two hours?
Final answer:
The driver must maintain an average speed of 60 km/h during the driving portion of the trip to cover 75 km in the remaining 1.25 hours after a coffee break and traffic jam.
Explanation:
The average speed necessary to complete a journey given certain time constraints. To determine the needed average speed, we can subtract the time spent not driving (coffee break and traffic jam) from the total time available for the trip. This gives us the actual driving time. Using the formula speed = distance \ time, we can calculate the average speed required to cover the 75 km journey in the remaining driving time.
In this case, the driver spends half an hour on coffee (0.5 hours) and a quarter of an hour (0.25 hours) in a traffic jam, which subtracted from 2 hours gives 1.25 hours (2 - 0.5 - 0.25 = 1.25 hours) of driving time. The average speed required is then speed = 75 km \ 1.25 hours = 60 km/h.
As the resistance increased under 25 V, the current blank. Compared to calculated currents, experimental currents proved to be blank . Currents varied proportionally according to resistance: 10 Ω of resistance produced a current of blank A, while 100 Ω of resistance produced a current of blank A.
Answer:
Decreased, The Same, 2.5 and .25
Explanation:
One normal afternoon in undisclosed City X, the chocolate factory workers overload the Easter egg machine. A group of angsty teens cutting school at the edge of City X see a large explosion from across town as the factory explodes, covering the rooftops in unrefined sugars. Five seconds later, they hear the boom. Approximately how far are they from the factory? show work
A. 68.6 m
B. 145 m
C. 1,715 m
D. 60,000 m
Answer:
The correct option is;
C. 1,715 m
Explanation:
We are given the information from the group of teen at the City edge
Time of arrival of explosion sound = 5 s after sighting
Time of sighting explosion = 5 s before hearing the boom
Speed of sound in air ≈ 343 m/s
Speed of light = 299,792 km/s
Therefore, distance covered by sound in 5 seconds is given by the following equation;
[tex]Speed = \frac{Distance}{Time}[/tex]
[tex]\therefore 343 \ m/s= \frac{Distance}{5 \, s}[/tex]
Hence Distance = 343 m/s × 5 s = 1715 m
To check, we compare the time it would take for the light to cover 1715 m
That is [tex]Time = \frac{Distance}{Speed} = \frac{1715}{299,792,000} = 0.00000572 \, s[/tex] which is instantaneous hence the distance can be approximated by the time duration for the speed of sound.
Therefore, the distance of the students from the factory is approximately 1,715 m
Using the speed of sound at 24.0°C, which is roughly 343 m/s, and knowing the sound took 5 seconds to reach the observers, the calculated distance to the explosion is 1715 meters.
The question involves calculating the distance from an observed event based on the speed of sound, which falls under the subject of Physics. To determine how far the teens are from the factory, we can use the speed of sound, which depends on air temperature. Given the standard temperature of 24.0°C, the speed of sound in air is approximately 343 meters per second. The explosion sound reached the teens 5 seconds after they saw it, meaning the sound traveled for 5 seconds to reach them.
The distance can be calculated using the formula: distance = speed x time. Plugging in the values: distance = 343 m/s x 5 s = 1715 meters. Therefore, the teens were approximately 1715 meters away from the factory when they heard the explosion.