Answer:
option B
−1.92 m/s2
Explanation:
Given in the question,
time took by truck to slow down = 3.56 sec
initial speed of truck = 112 km/h
final speed of truck = 87.4 km/h
1 km/h = 0.277778 m/s
112 = 31.1 m/s
87.4 = 24.28 m/s
Formula use to calculate the acceleration
v - u = at
where v is final speed
u is initial speed
a is acceleration
t is time
plug values in the equation
24.28 - 31.1 = a(3.56)
-6.8 = a(3.56)
a = -6.8 / 3.56
a = -1.9 m/s²
Help...??
Which describes the behavior of light when traveling from a medium through which it travels more slowly, such as water to a medium through which it travels faster , such as air?
a. light travels perpendicular to the normal.
b. light bends away from the normal.
c. light bends towards the normal.
d. light travels in a straight line.
"If a ray of light passes across the boundary from a material in which it travels slowly into a material in which travels faster, then the light ray will bend away from the normal line."
I hope this helps, it bends away from the normal
An electric current produces a magnetic field because of ______.
A.) Magnetism
B.) The Moving Protons
C.) Magnetic field
D.) Induction
An electric current produces a magnetic field because of the motion of charged particles. While the original question suggests moving protons, it is actually the movement of electrons in the current that generates the magnetic field. This process is closely related to the principle of induction, where changing magnetic fields induce electric currents in conductors.
Explanation:An electric current produces a magnetic field due to the magnetic field from the moving charges in the current. When electric charges are in motion, such as when electrons flow through a conductor, they generate a magnetic field around them. This is a fundamental principle of electromagnetism, informed by Oersted's discovery and formalized by the works of Faraday and Henry. The key underlying concept relating to the production of magnetic fields by electric currents is the motion of charged particles, which in most cases are electrons.
To address the original question: An electric current produces a magnetic field because of B.) The Moving Protons. However, this is a misleading choice as it is actually the electrons that move in a conductor, not protons. A more accurate statement would be the movement of charged particles—typically electrons in circuits—produces a magnetic field.
One can induce a magnetic field through the interaction of magnets with conductors, a process known as induction. For example, moving a bar magnet through a wire loop (as stated in the provided information), known as motional emf, will induce an electric current in the wire loop due to the changing magnetic flux.
Learn more about Magnetic Fields by Electric Currents here:
https://brainly.com/question/13810372
#SPJ12
Which object has the greatest gravitational attraction ?
Jupiter is the largest planet in our Solar System. Hence, Jupiter has the greatest gravitational attraction in our Solar System.
What is gravity?Gravity is a fundamental interaction in physics that produces attraction between all objects with mass or energy. Of the four fundamental interactions, gravity is by far the least powerful; at the level of subatomic particles, it makes no difference at all.
The motion of planets, stars, galaxies, and even light is controlled by gravity, which is the most important interaction between things at the macroscopic level.
Strength of gravitational force an be expressed as:
E = GM/r²
Where G = universal gravitational constant and M = mass of the planet; r = distance between the planet and the object.
As Jupiter is the largest planet in our Solar System, Jupiter has the greatest gravitational attraction in our Solar System.
Learn more about gravity here:
https://brainly.com/question/4014727
#SPJ6
what is the proper equation to use for finding the net force in the y direction
The direction of the acceleration is the same as the direction of the net force: 34 degrees. Apply the equation <eq04017> to find the magnitude of the net force, giving you 35.4 N. Use the magnitude of the force and the mass to find the magnitude of the acceleration: a = F/m = (35.4 N)/(0.10 kg) = 354 m/s2.
Answer: it’s Fnety =(FT)(Sin 32°)- Fg
Explanation:
I guessed it right
The average kinetic energy of the particles in an object is directly proportional to its A) heat. B) volume. C) temperature. D) potential energy.
the average kinetic energy of the particles in an object is directly proportional to its TEMPERATURE.
Answer: B
Explanation: the answer is b
The efficiency of a device such as a lamp can be calculated using this equation:
efficiency = (useful energy transferred ÷ energy supplied) × 100
Using the formula, calculate the efficiency of the lamp shown in the diagram above.
A) 7%
B) 25%
C) 70%
D) 75%
Answer: C- 70%
Explanation:
Useful energy = 250J-75J = 175J
175J/250J*100= 70%
Efficiency should always be less than 1 or below 100% because every device wastes some energy. You committed a calculating error if you receive a result that is more than 1 or 100% Thus option C is correct.
What efficiency of a device as a lamp can be calculated?Efficiency refers to how effectively a technology converts energy input into usable energy output. The percentage of energy delivered in beneficial ways determines a device's efficiency. Either a decimal or a percentage can be used to represent the efficiency.
Any efficiency can be determined by dividing the energy input by the energy output by 100%. This equation serves as a general representation of energy in the form of heat or power.
Therefore, Useful energy = 250J-75J = 175J 175J/250J×100= 70%
Learn more about efficiency here:
https://brainly.com/question/28008092
#SPJ3
A force of 2 newtons is required to stretch a spring 4 cm. The amount of force required to stretch the same spring 8 cm is _____ newton(s)
a) 1
b) 2
c) 4
d) 8
Answer will be c for this one!
Which of these statements about mixtures is true A.mixtures are made up of elements bonded together B.Elements and compounds are types of mixtures C.Pure substances are made up of mixtures combined in specific ratios D.mixtures are classified based on the distribution of particles in them
The true statement is that mixtures are classified based on the distribution of particles in them. Mixtures are a combination of two or more pure substances that retain their individual properties. Elements and compounds, often components of a mixture, are not inherently mixtures themselves.
Explanation:Among the statements given about mixtures, the true one is statement D: mixtures are classified based on the distribution of particles in them. Mixtures are a combination of two or more pure substances in which each substance keeps its own properties. They are not chemically combined. Elements and compounds can often form part of a mixture but are not, in themselves, mixtures. Elements, compounds, and mixtures each have different classifications and properties in the field of chemistry.
Learn more about Mixtures here:https://brainly.com/question/22742069
#SPJ6
If a light Ray is aimed so that it bounces off a metal drain in a pool, the light Ray will reflect off the drain according to ? A) shells law B) the law of reflection C) the law of refraction D) the law of incidence
Answer:
B) the law of reflection
Explanation:
When a light ray reflects off a surface, it obeys the law of reflection.
A few definitions before giving the law of reflection:
- The angle of incidence is defined as the angle between the incident ray and the normal to the surface
- The angle of reflection is defined as the angle between the reflected ray and the normal to the surface
The law of reflection states that:
- The angle of incidence is equal to the angle of reflection
- The incident ray and the reflected ray lie both on the same plane.
A 111.6 g sample of iron was heated from 0°C to 20°C. It absorbed 1004 J of energy. What is the specific heat capacity of iron?
Formula
H = m*c*ΔT
Givens
H = 1004 J
m = 111.6
ΔT = 20 - 0
ΔT = 20
c = ?
Solution
1004 = 111.6 * c * 20 Multiply the right.
1004 = 2232*c Divide to get c
1004/2232 = c Do the division
0.4498 = c
Specific heat of iron = 0.4498
Why higher voltage means thinner cables and why it is then cheaper?
The higher the voltage, the lower the current. ... The lower current that accompanies high voltage transmission reduces resistance in the conductors as electricity flows along the cables. This means that thin, light-weight wires can be used in long-distance transmission.
a screwdriver with a 1-cm shaft and a 4-cm handle is used to tighten a screw calculate the mechanical advantage
Mechanical advantage = 4
Explanation;Screwdriver is a type of wheel and axle and the mechanical advantage of a wheel and axle depends upon the size of the wheel compared with the size of the axle.To calculate the mechanical advantage of a wheel and axle, you take the radius of the wheel, (which is the distance from the center of the wheel to the outside edge), and divide it by the radius of the axle.In this case;
Radius of the screwdriver’s handle = 4 cm
Radius of the shaft = 1 cm
Therefore,
Ideal mechanical advantage = 4 cm/1 cm
= 4
What is the temperature of a gas in which the atoms are moving very, very slowly? Question 9 options: cold hot room temperature
The temperature of the gas will be cold, because the atoms move very slow,
Answer:
cold
Explanation:
According to kinetic theory of gases, gases at same temperature have same kinetic energy. The speed (v) of the particles of the gas is directly proportional to the temperature (T) of the gas.
K.E. ∝ T
v ∝ T
In the given situation, the atoms of gas are moving very slowly. This means that the temperature of the gas must be very low. The temperature of the gas would be cold.
The diagram shows a spectrometer being used to analyze a sample of a solution.
Which letter represents the diffraction grating?
A. W
B. X
C. Y
D. Z
Answer
B. X
A plate of glass or metal ruled with very close parallel lines, producing a spectrum by diffraction and interference of light.
diffraction grating is an optical component that splits and diffracts light into several beams travelling in different directions. The light emerges with its colours separated.
Answer:
X
Explanation:
I just answered this question on my quiz
Which planet in the list below is larger than Earth? A. Saturn B. Mars C. Mercury D. Venus
ANSWER:
the planet that is larger than earth is Saturn
~batman wife dun dun dun...aka ~serenitybella
it would be Saturn
The equatorial diameter of Saturn is 120,536 km; that's about 9.5 times bigger than the diameter of the Earth. The surface area of Saturn is 83 times the area of Earth, and the volume is 764 times the volume of Earth. In other words, you could fit 764 planets the size of Earth inside Saturn.
If you get married in 2019, and then in the future 28 years have past what would your age be. Also when you get married in 2019 the age is 18
the answer is 46 because the year is 2047 and you was eighteen in 2019 so you was born in 2001
To calculate the age after 28 years from getting married at age 18 in 2019, you add 28 to 18, resulting in an age of 46 years.
If someone gets married at the age of 18 in the year 2019, to calculate their age after 28 years have passed, you simply add 28 to their age at marriage. Here's the step-by-step calculation:
Age at marriage: 18 yearsYears passed: 28 yearsNew age = Age at marriage + Years passedNew age = 18 years + 28 yearsNew age = 46 yearsTherefore, after 28 years have passed since getting married in 2019, the person would be 46 years old.
During which month will Europe and Africa each have equal amounts of sunlight?
The answer is March because they are have an equal amount of sunlight in the vernal equinox which is during the month March.
Answer: March and September
Explanation: Equinox is a term that is related to the position of the Earth in relation to the Sun, and this is a short period of time when the plane of the equator passes through the center of the Sun. This happens twice a year and there are spring and autumn equinoxes, more specifically around March 20 and September 23, and then, thanks to the position of the Earth's equator in relation to the center of the Sun, the amount of sunlight is the same in Africa and Europe. So in March and in September.
if a 6kg ball is hanging by a rope from the ceiling at rest, what is the tension of the rope?
Answer:
58.8 N
Explanation:
Since the ball is hanging at rest, the net force on the ball must be zero.
There are only two forces acting on the rope:
- Its weight, downward, given by W = mg, where m = 6 kg is the mass of the ball and g=9.8 m/s^2 is the acceleration due to gravity
- the tension in the rope, T, upward
Therefore, the equation for the forces is:
[tex]T-W=0[/tex]
And solving for T, we find:
[tex]T=W=mg=(6 kg)(9.8 m/s^2)=58.8 N[/tex]
Materials such as oil and gas are used as fuel because they have what chemical property?
Among the most important characteristics of fuels is their heating value.
oil and gas have relatively high heating values as compared to other locally available materials. they are also easy to burn as they are highly inflammable.
ignition takes less time due to this property.
Light travels at a constant speed of about 300,000 km/s. This speed is referred to as the speed of light. A light year is the distance that light travels in one year. One light year is equal to 9.46 trillion kilometers. The closest star to Earth, other than the Sun, is Proxima Centauri. It takes light from this star about 4.2 years to reach Earth. How far from Earth is the star Proxima Centauri? A. 4.2 light years B. 9.46 trillion km C. 300,000 light years D. 300,000 km.
Based on the information in the question, a light year is the distance traveled light in one year. Then if the light from the star Centauri takes 4.2 years to reach the earth, then its distance from earth is 4.2 light years.
Answer:
The correct choice is
A. 4.2 light years
Explanation:
v = speed of light = 300,000 km/s
t = time taken for the light to travel from Proxima centauri to earth = 4.2 years
d = distance traveled by light in 1 year = 1 light year
So
distance in 1 year = 1 light year
distance in 4.2 year = 4.2 light year
Hence
distance of star Proxima Centauri from earth = 4.2 light year
If there is a North and South Pole on a magnet why don’t north and north meat or south and south
Because like poles repel and unlike poles attract. This is a property of every magnet.
Final answer:
Magnets have both north and south poles, which cannot be separated; like poles repel each other, preventing north poles or south poles from meeting. Cutting a magnet results in new pairs of poles, as they always occur in pairs.
Explanation:
Every magnet has two types of poles, a north pole and a south pole. These poles always come in pairs and cannot be separated; they exhibit a fundamental property of magnets. The reason a north pole does not meet another north pole, or a south pole another south pole, is due to the magnetic fields that they generate. Like poles will always repel each other, which means the north pole of one magnet will repel the north pole of another magnet, and the same goes for two south poles.
When a magnet is cut, even into very small fragments, each piece will retain a north and a south pole. It is impossible to isolate a north pole or a south pole on its own, which is a basic principle of magnetism. Therefore, regardless of how much you divide a magnet, you will never end up with a single pole; new pairs of poles will emerge in each fragment. This inherent characteristic is verified by experiments and is even observable on the atomic level with elements that exhibit magnetic properties, such as iron.
Although the acceleration due to gravity is the same on all objects, why do a flower petal
and a hammer that are falling towards the Earth hit the ground at different speeds and
times. (I need a really good explanation)
We know that acceleration due to gravity is the same for all objects. But if we drop a flower petal and a hammer from the same height, the hammer falls faster. Why does this happen?
Let me try to explain. The petal falls slower as the resistance it faces by air slows it down much more. Even though the hammer is also affected by this resistance, the speed decrease is negligible due to its weight.
To simplify, a petal is much lighter than a hammer. Even though gravity accelerates them at the same speeds, the petal slows down due to air resistance but the hammer doesn't, as its weight counteracts the air resistance.
I may be confusing at times, so please ask me if you want anything clarified :)
Hope this helps you!
Need help with question 4 for physics
do c or A I personally would do c
How does a star’s life begin?
THE LIFE OF A STAR
The star starts as a NEBULA basically like this really pretty universal gas. The gas then starts to attract to each other and sticks around together. In the universe the temperature may vary. When the temperatures are extremely high there is a REACTION aka FUSION that takes place.
Then THERE IS A STARR
How does a magnet affect another magnet, something made of iron or a similar metal, and moving charges?
It exerts an electric force.
It exerts a magnetic force.
It exerts a polar force.
It exerts a force proportional to the magnet’s charge.
How does a magnet affect another magnet, something made of iron or a similar metal, and moving charges?
It exerts a magnetic force.
~Hope this answers your question!~
Answer: The correct answer is "it exerts a magnetic force".
Explanation:
Magnet: It has magnetic properties. It has two poles: south pole and north pole.
Magnets attract the iron or other metal. It is due to the influence of their magnetic field. The atoms of the iron gets align their electrons. In this way, the iron gets magnetized.
There is a magnetic force of attraction between the opposite poles. There is a magnetic force of repulsion between the same poles.
The current carrying conductor produces the magnetic field around it.
If the compass needle is placed near the current carrying conductor then it will show the deflection. It shows the presence of the magnetic field around the current carrying conductor. It exerts a magnetic force.
Therefore, the option "It exerts a magnetic force" is a correct.
Neglecting losses in a transformer, it's input and output ______ are equal.
A.) Current
B.) Voltage
C.) Power
D.) Turns of wire
Neglecting losses in a transformer, it's input and output power are equal. (C)
The input power in the transformer are equal to the output power of a transformer.
Answer : Option C
Explanation:
The transformers have power on either side as input or output to be constant. This is so because the transformers are the electrical device which transfer the energy between the circuits. There are two types of transformers, step up transformers and step down transformers.
Both follows the following expression of power = voltage x current. According to the type of transformer, the turns of wire and voltage and current are kept varying but the power remains constant.
A negative charge is moving across a room from south to north. A magnetic field runs from east to west. In what direction is the magnetic force on the moving negative charge?
A.
toward the east
B.
toward the west
C.
toward the floor
D.
toward the ceiling
Answer:
plato answer is c?
Explanation:
What factor might be contributing to climate change
Final answer:
Climate change is primarily driven by the emission of greenhouse gases like carbon dioxide and methane, mainly from the burning of fossil fuels, deforestation, agriculture, and manufacturing. Human-caused factors are the most significant contributors to the current rates of global warming, surpassing natural influences on the climate.
Explanation:
One significant factor contributing to climate change is the emission of greenhouse gases such as carbon dioxide (CO2) and methane. The largest driver of warming comes from burning fossil fuels like coal, oil, and natural gas, which is the main source of CO2 emissions. This is further compounded by deforestation, agriculture, and manufacturing. Other manmade causes include increases in near-surface ozone from internal combustion engines, and aerosols such as carbon black and dust, which impact the Earth's albedo and its ability to reflect solar radiation.
It is essential to distinguish between natural factors that have historically influenced climate, such as changes in Earth's orbital patterns, plate tectonics, solar output, and volcanic activity, versus the anthropogenic (human-caused) factors driving the current unprecedented rates of climate change. Human-related factors far outweigh natural influences, which cannot fully explain the rapid increase in global temperatures observed today. The use of fossil fuels for energy and transportation is identified as the critical factor in fueling the current trend of climate change, contributing directly to the greenhouse effect.
Efforts to reduce emissions, transition to renewable energy sources, and implement more sustainable practices are vital steps in addressing the ongoing climate crisis. This reflects a dire need for coordinated global action to mitigate the impacts on food supply, water resources, ecosystems, and human health.
Which is a tool used by scientists to determine the composition of objects?
A. a hologram
B. a spectrometer
C. a wave front
D. a prism
Answer:
Its B
Explanation:
edg2020
Spectrometer is the tool used by scientists to determine the composition of objects. So, option B is correct.
What is meant by spectroscopy ?Spectroscopy is defined as the technique of studying the structure and properties of matter by using radiations.
Here,
The method of spectroscopy is that it analyses matter by using radiations. In this process, the radiations emitted and absorbed by the particles are analyzed. The instrument used is called spectrometer. Thus the absorption spectra and emission spectra of the particle are obtained. From this, the interaction of the particle with the materials in form of energy can be studied. Spectroscopy can be called as the measurement of the matter-energy interactions by means of radiation and their wavelengths as the function of energy. Spectroscopy and its applications have been widely used in many of the theories in physics. Quantum mechanics and relativity theories and many others has been developing their theories by the major applications of spectroscopy. Study of material particles are widely done by spectroscopy
Hence,
Spectrometer is the tool used by scientists to determine the composition of objects.
To learn more about spectroscopy, click:
https://brainly.com/question/5402430
#SPJ7
When using the magnification equation, a value greater than 1 as the solution for M indicates that the image is
larger than the object.
smaller than the object.
real.
virtual.
Answer:
Larger than the object
Explanation:
The magnification of a lens/mirror is given by the equation:
[tex]M=-\frac{h_i}{h_o}[/tex]
where
[tex]h_i[/tex] is the size of the image
[tex]h_o[/tex] is the size of the object
from the formula, we see that if M is greater than 1, it means that [tex]|h_i|>|h_o|[/tex]
and so, it means that the image is larger than the object.
The negative sign simply tells if the image is upright or inverted: when M is positive, the image is upright, when M is negative, the image is inverted.
Answer:
Larger than the object
Explanation: