An electromagnet is made from a coil of wire which acts as amagnet when an electric current passes through it. Often anelectromagnet is wrapped around a core of ferromagnetic material like steel, which enhances the magnetic field produced by the coil.
Electromagnets and bar magnets have similar characteristics with north and south poles, but differ in that electromagnets need a power supply while bar magnets are permanent.
Electromagnets and bar magnets share similarities such as having north and south poles that attract and repel each other. They both produce a magnetic field around them.
However, electromagnets require an external power supply to generate a magnetic field, while bar magnets are permanent magnets that do not need an external power source.
temperatures expressed in the kelvin scale are _____ higher than temperatures in the celsius scale.
a. 460°
b. 200°
c. 283°
d. 273°
Answer: d
Explanation:
Celsius temperatures can be negative while kelvin goes down to absolute zero and doesn’t go any lower, thus no negative numbers
Answer:
option (D)
Explanation:
The melting point of ice is 0 degree and the boiling point of water is 100 degree on Celsius scale. There are 100 divisions between the melting point and the boiling point.
The melting point of ice is 273 degree and the boiling point of water is 373 degree on Kelvin scale. There are 100 divisions between the melting point and the boiling point.
The relation between the Celsius scale and the Kelvin scale is
[tex]\frac{C - 0}{100}= \frac{K - 273}{100}[/tex]
So, K = C + 273
Hans Selye’s general adaptation syndrome theory proposes that adaptation to stress occurs in how many stages?
Answer:
Adaption to stress occurs in three stages: alarm, fight or flight, exhaustion.
Explanation:
According to the general adaptation syndrome theory proposed by Hans Selye, the adaption to stress occurs in three stages which are:
1. alarm
2. fight or flight
3. exhaustion
This is a process which comprises of three stages that describes the physiological changes which a body undergoes when in stress (an emotional, mental and physical human response to a specific stimulus).
Hans Selye’s general adaptation syndrome theory proposes three stages of stress response: alarm reaction, stage of resistance, and stage of exhaustion. These stages depict how our body physiologically reacts and adapts to stressful situations.
Explanation:Hans Selye’s general adaptation syndrome theory proposes that adaptation to stress occurs in three stages. These stages include the alarm reaction, where the body's immediate reaction to a stressful situation occurs, the stage of resistance, where the body begins to adjust to the stressor, and the stage of exhaustion, where the body's resources become depleted due to prolonged exposure to the stressor. Understanding these stages can help individuals better manage and respond to stressors in their lives.
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The phase of mitosis during which the chromosome pairs line up
along the middle, or the equator, of the cell is called
a. anaphase
b. prophase
c. telophase
d. metaphase
\
Never mind. I got the answer, it was d
Yep the answer is d
Metaphase is characterized by sister chromatids lining up at the cell's equator, on a plane known as the metaphase plate, preparing for separation during anaphase.
Metaphase is the second stage of mitosis. During this stage, the sister chromatids, with their attached microtubules, line up along a linear plane in the middle of the cell. This is known as the metaphase plate, a plane through the center of the spindle on which the sister chromatids are positioned. The spindles, emerging from centrosomes at either end of the cell, are poised to pull apart the sister chromatids and distribute one from each pair to each side of the cell. The chromosomes are maximally condensed at this time, ensuring efficient separation during the subsequent phase of anaphase.
3. Which subatomic particle(s) determines an atom's atomic number?
Answer:
The remainder of the hydrogen atom's mass comes from the positively charged proton. The atomic number of an element is the number of protons in its nucleus. Neutrons are neutral particles having a mass slightly greater than that of the proton. Different isotopes of the same element contain the same number of protons but differing numbers of neutrons.
Explanation:
What is the vector product of two vectors????
Answer:
The magnitude of the vector product of two vectors can be constructed by taking the product of the magnitudes of the vectors times the sine of the angle (<180 degrees) between them. The magnitude of the vector product can be expressed in the form: and the direction is given by the right-hand rule.
Answer:
The vector product of two vectors is a vector perpendicular to both of them. Its magnitude is obtained by multiplying their magnitudes by the sine of the angle between them.
in which region of the sun does energy move as waves that transfer from atom to atom
Answer:
Radiative zone
Answer:photosphere corona core radiative zone chromosphere convective zone. Radiative zone of the Sun does energy move as waves that transfer from atom to atom.
Explanation:photosphere corona core radiative zone chromosphere convective zone. Radiative zone of the Sun does energy move as waves that transfer from atom to atom.
What is the most significant factor in determining kinetic energy?
Answer:
The velocity
Explanation:
Kinetic energy of an object is directly proportional to the square of its velocity if mass if kept constant. Therefore, if the velocity is doubled the kinetic energy increases four times.
K.E= 1/2mv²
m is the mass of the object and v the velocity. This means that there must be motion for there to be kinetic energy.
sample of pure water has a hydronium concentration of 1.0 × 10-7 M. What is the pH of the water?
Answer:
The pH of the water is 7.
Explanation:
The pH of the solution is defined as negative logarithm of H^+ or hydronium ions ions in the solution.
pH=-\log[H^+]
So, H^+ concentration of water = 1.0\times 10^{-7} m
pH=-\log[1.0\times 10^{-7}]=7
The pH of the water is 7.
The pH of pure water with a hydronium concentration of 1.0 × 10⁻⁷ M is 7, indicating that the water is neutral.
The pH of a solution is a measure of its acidity or alkalinity. In the given sample of pure water with a hydronium ion concentration of 1.0×10⁻⁷ M, we calculate the pH by taking the negative logarithm of the hydrogen ion concentration, which here is -(-7), giving us a pH of 7. This pH value indicates that the solution is neutral, since pure water has a pH of 7 at 25 °C.
A brick has a greater mass than a sponge has. Why is the acceleration due to gravity the same for both objects?
Answer:Gravity
Explanation: all objects fall at the same time no matter the weight or size
The only thing that would change the time of falling of said object is if the object has greater air resistance like a feather
All objects accelerate at the same rate due to gravity (9.8 m/s^2) because of the equivalence principle, which states that inertial mass and gravitational mass are equal, causing a balance between the gravitational force and inertia.
The acceleration due to gravity is the same for all objects, regardless of their mass, because gravity affects all objects equally. This is a result of what is known as the equivalence principle, which states that the inertial mass (resistance to acceleration) and the gravitational mass (how much force is exerted by gravity) of an object are equivalent. Therefore, when looking at the formula for force (¹Force equals mass times acceleration), a lighter object like a sponge and a heavier object like a brick, when dropped, will both experience the same acceleration of 9.8 m/s2 because the greater gravitational force on the brick is exactly balanced by its greater inertia. This phenomenon dismisses the mass of Earth in calculations as it is significantly larger than that of the objects.
HOW DO PROTONS, NEUTRONS AND ELECTRONS DIFFER?
The protons has the positive charge, neutron has no charges and electrons have the negative charge.
Explanation:
The basic difference between the particles of the atom are their charges and their orientation in the atom. The proton and the neutron are present in the nucleus of the atom whereas the electrons are at the periphery of the atom. The nucleus is stationary in orientation having proton and neutron in it, whereas the periphery as the electrons are moving. Electrons revolves around the nucleus.
State the 3 laws of motion
Answer:
Explanation:
Newton's first law of motion:
An object in motion stays in motion, and an object at rest stays at rest, until acted upon by an unbalanced force.
Newton's second law:
The net force on an object is equal to its mass times its acceleration.
Newton's third law:
For every action, there is an opposite and equal reaction.
A little bumblebee accelerates uniformly at 1.5 m/s² from rest to 22 m/s. Immediately upon reaching 22m/s, the brakes are applied, and it stops 2.5 s later. Find the total distance traveled.
Answer:
190 m
Explanation:
Displacement during acceleration:
v² = v₀² + 2a(x - x₀)
(22 m/s)² = (0 m/s)² + 2(1.5 m/s²)(x - 0 m)
x = 161.333 m
Displacement after deceleration:
x = x₀ + ½ (v + v₀)t
x = 161.333 m + ½ (0 m/s + 22 m/s)(2.5 s)
x = 188.833
Rounded to 2 sig-figs, the bumblebee travels a distance of 190 m.
what is the coefficient for titanium tetrachloride when the equation below is balanced?
the coefficient of TiCl4 would be 1
How much current will flow through a 470-Ohm resistor if a 9-volt battery is used?
Answer:
For a 470-Ohm resistor connected to a 9-votl battery the current that will flow is 0.019A or 19mA
Explanation:
Ohm's law states that the voltage v along a resistor is directly proportional to the current i flowing through the resistor.
[tex]v = i R[/tex]
Clear i from the equation above
[tex]i = \frac{v}{R}[/tex]
[tex]i = \frac{9volt}{470ohm} =0.019A[/tex]
The current flowing through a 470-Ohm resistor with a 9-volt battery is approximately 0.0191 Amperes.
Explanation:In order to determine the current flowing through a resistor, we can use Ohm's Law, which relates voltage, current, and resistance. Ohm's Law states that current (I) is equal to the voltage (V) divided by the resistance (R). So, in this case, we can calculate the current flowing through a 470-Ohm resistor with a 9-volt battery using the formula:
I = V / R
Substituting the given values, we have:
I = 9 V / 470 Ohm
Simplifying the expression gives us the current:
I ≈ 0.0191 A
Therefore, approximately 0.0191 Amperes (or 19.1 milliamperes) of current will flow through the 470-Ohm resistor when a 9-volt battery is used.
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1. Which quantity is the transfer of energy?
work
motion
force
Answer:
work
Explanation:
Work is the transfer of energy by a force to another object. Energy is transferred when a force causes an object to be displaced.
Work is defined as the transfer of energy by a force. When a force is applied over a distance, work is done, and energy is transferred from one object to another. Work is measured in joules, with 1 joule being equivalent to 1 newton-meter.
A rock is dropped from a vertical cliff. The rock takes 6.00 s to reach the ground below the cliff. What is the height of the cliff? (take g=10.0 m/s2)
Answer:
180 m
Explanation:
The rock follows a free-fall motion - so the vertical distance covered can be found by using the equation
[tex]h=\frac{1}{2}gt^2[/tex]
where
g = 10 m/s^2 is the acceleration due to gravity
t = 6.00 s is the time of the fall
Substituting these data, we find the height of the cliff:
[tex]h=\frac{1}{2}(10 m/s^2)(6.00 s)^2=180 m[/tex]
The height of the cliff from which the rock is dropped can be calculated using the formula h = 0.5*g*t². This gives us a calculated height of 180 meters.
Explanation:The problem you're dealing with is related to one of the basic physics equations of motion, specifically for an object under constant acceleration - in this case, the acceleration due to gravity. To find the height of the cliff, we can use the formula h = 0.5*g*t², where 'h' is the height, 'g' is the acceleration due to gravity (10.0 m/s² as provided), and 't' is the time it takes for the rock to hit the ground (6.0 seconds in this problem).
Plugging in the known values into the equation gives us h= 0.5*10.0*(6.0)² = 180.0 meters. This means the cliff is approximately 180 meters high.
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Caleb is swinging Rachel in a circle with a centripetal force of 533 N. If the radius of the circle is 0.75 m and Rachel has a mass of 16.4 kg, how fast is Rachel moving? Round to the nearest tenth. m/s
Velocity = √((Centrifugal force * radius)/mass)
Velocity = √(533 * 0.75 / 16.4)
Velocity = √(399.75 / 16.4)
Velocity = √24.375
Velocity = 4.9 m/s
Answer:
4.9
Explanation:
I just did it
Plz help, it for my science CFE.
Which of the following four fundamental forces is responsible for binding protons and neutrons together in the nucleus?
A. Electromagnetism
B. Weak nuclear force
C. Gravity
D. Strong nuclear force
Answer: The strong nuclear force.
Explanation: The strong force holds the protons and neutrons together in the nucleus. Despite being the strongest force, it has a very small range. (Think about how small an atom is) The strong force is thought to occur due to the exchange of pions between the protons and the neutrons. Since pions have a very short lifespan, the protons and neutrons must be very close to each other in order to exchange them. This phenomenon is what keeps the protons and neutrons so tightly binded together in the nucleus.
Which units are used to express kinetic energy?
meters
seconds
joules
newtons
Answer:
The SI units for energy is Joules.
Answer: Joules
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Which is not a form of light?
Radio waves, Middle-C, and halitosis are not forms of light.
All of the above are forms of light. Therefore, the correct option is option D among all the given options.
What is light?Light as well as visible light is electromagnetic that is visible to the human eye. Here between infrared and ultraviolet ranges, visible light is commonly defined as having wavelengths of 400-700 nanometres (nm) or frequencies of 750-420 terahertz.
In physics, the term "light" can be used to more broadly characterize electromagnetic radiation of any wavelength, whether visible or not. Gamma rays, X-rays, microwaves, and radio waves are all forms of light in this sense. All of the above are forms of light.
Therefore, the correct option is option D.
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Your question is incomplete but most probably your full question was,
Which of the following is not a form of light?
A) radio waves
B) microwaves
C) x-rays
D) All of the above are forms of light.
E) None of the above is a form of light
Which of the following has the greatest momentum?
A. a tortoise with a mass of 275 kg moving at a velocity of 0.55 m/s
B. a hare with a mass of 2.7 kg moving at a velocity of 7.5 m/s
C. a turtle with a mass of 91 kg moving at a velocity of 1.4 m/s
D. a roadrunner with a mass of 1.8 kg moving at a velocity of 6.7 m/s
Answer:
A
Explanation:
Momentum is mass times velocity.
A. 275 kg × 0.55 m/s = 151.25 kgm/s
B. 2.7 kg × 7.5 m/s = 20.25 kgm/s
C. 91 kg × 1.4 m/s = 127.4 kgm/s
D. 1.8 kg × 6.7 m/s = 12.06 kgm/s
So A has the greatest momentum.
Momentum of a body is the product of the mass of the body and its velocity. The momentum of the tortoise is greatest. Thus option A is the correct option.
What is momentum?Momentum of a body is the product of the mass of the body and its velocity. It can be given as,
[tex]p=mv[/tex]
Given options are,
A) A tortoise with a mass of 275 kg moving at a velocity of 0.55 m/sThe mass of the tortoise is 275 kg.
The velocity of the tortoise is 0.55 m/s.
Thus momentum of tortoise,
[tex]p_a=275\times0.55\\p_a=151.25[/tex]
Hence the momentum of the tortoise is 151.25 kg-m per second.
B) A hare with a mass of 2.7 kg moving at a velocity of 7.5 m/sThe mass of the hare is 2.7 kg.
The velocity of the hare is 7.5 m/s.
Thus momentum of hare,
[tex]p_b=2.7\times7.5\\p_b=20.25[/tex]
Hence the momentum of the hare is 20.25 kg-m per second.
C) A turtle with a mass of 91 kg moving at a velocity of 1.4 m/sThe mass of the turtle is 91 kg.
The velocity of the turtle is 0.14 m/s.
Thus momentum of turtle,
[tex]p_c=91\times1.4\\p_c=127.4[/tex]
Hence the momentum of the turtle is 127.4 kg-m per second.
D) A roadrunner with a mass of 1.8 kg moving at a velocity of 6.7 m/sThe mass of the roadrunner is 1.8 kg.
The velocity of the roadrunner is 6.7 m/s.
Thus momentum of roadrunner,
[tex]p_d=1.8\times6.7\\p_d=12.06[/tex]
Hence the momentum of the roadrunner is 12.06 kg-m per second.
Hence the momentum of the tortoise is greatest. Thus option A is the correct option.
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When work is measured in joules and time is measured in seconds power is measured in kilograms true or false
The answer is:
False, the power measured is equivalent to Watt.
Why?The power is the rate which a determinate amount of work is done, being this, the amount of work done over time, which is also equal to the energy used over time.
We can calculate the power using the following formula:
[tex]Power=\frac{Work}{Time}[/tex]
Where,
Power, is quantity of energy used over time, measured in Watt.
Work, is the energy transferred when an object is in motion, covering a distance, it's measured in Joules (N.m)
Time, is the time measured in seconds.
Have a nice day!
An alien spaceship is 8*10^14 m away sends us a radio wave signal. How long does it take for the signal to reach us?
Answer:
[tex]2.67\cdot 10^6 s[/tex]
Explanation:
The radio signal travels to us at the speed of light, so at a speed of
[tex]c=3.0\cdot 10^8 m/s[/tex]
The distance between the spaceship and the Earth is
[tex]d = 8\cdot 10^{14}m[/tex]
Since the signal travel by uniform motion, we can write
[tex]d = vt[/tex]
where
t is the time the signal needs to reach the Earth
By solving the equation for t, we find
[tex]t=\frac{d}{v}=\frac{8\cdot 10^{14} m}{3.0\cdot 10^8 m/s}=2.67\cdot 10^6 s[/tex]
a wave travels at a speed of 793 m/s and has a wavelength of 2.3 meters. calculate the frequency of the wave
Answer:
344.8 Hz
Explanation:
The frequency of a wave is given by:
[tex]f=\frac{v}{\lambda}[/tex]
where
v is the speed of the wave
[tex]\lambda[/tex] is its wavelength
Here we have
v = 793 m/s
[tex]\lambda=2.3 m[/tex]
Substituting into the equation, we find
[tex]f=\frac{793 m/s}{2.3 m}=344.8 Hz[/tex]
Calculate the total resistance for a 650ohm , a 350 ohm , and a 1000 ohm resistor connected in series
Answer:
2000 ohms
Explanation:
Resisters in series just add.
Rt = R1 + R2 + R3
R1 = 650 ohm
R2 = 350 ohm
R3 = 1000 ohm
Rt = 650 + 350 + 1000
Rt = 2000 ohms.
The total effective resistance of several resistors in SERIES is just the sum of all the individual resistances.
So the effective resistance of 650Ω, 350Ω, and 1,000Ω in series is
Sum = (650Ω + 350Ω + 1,000Ω)
Sum = 2,000 ohms
To balance a chemical equation we use______.
-coefficients
-subscripts
Answer:
Coefficients
Explanation:
Coefficients are used to balance chemical equations.According to the law of conservation of mass, the mass of the reactants in a chemical equation should be equivalent to the mass of the products.The conservation of mass is achieved in chemical equations is achieved through balancing chemical equations. Balancing chemical equations is a try and error of putting appropriate coefficients to the reactants or products to ensure that the number of atoms of each element are equal on the side of the reactants and that of products.1. The speed and direction with which an object moves is its
It’s called velocity. Velocity is a vector quantity so it’s basically the same thing as speed but the difference is it’s speed in a certain direction.
Answer:
The speed and direction with which an object moves is its velocity.
Explanation:
Velocity is the speed of an object with a given direction.
Hope this helps.
Please help I’m a big stupid idiot head
Answer:
Explanation:
ur right i think
Ur right gimme brainlyest
A bus starts to move from rest. if it's velocity becomes 90 km per hour after 8 seconds , calculate it's acceleration (numerical problem)
Assuming the bus undergoes constant acceleration, it is given by:
a = (Vf-Vi)/Δt
a is the acceleration, Vf is the final velocity, Vi is the initial velocity, and Δt is the elapsed time.
Given values:
Vf = 90km/hr = 25m/s (the conversion rate from km/hr to m/s is 1/3.6)
Vi = 0m/s (starts from rest)
Δt = 8.0s
Plug in the values and solve for a:
a = (25-0)/8
a = 3.125m/s²
Round to 2 significant figures.
a = 3.1m/s²
This position-time graph describes an object's motion. Use it to determine the
displacement (in m) of the object after 6.0 seconds of motion. Enter the
appropriate + or - sign.
Displacement=?
We're happy that you're asking for the "displacement", because displacement is simply the straight-line distance between the start-point and end-point, and we don't care about any of the motions or gyrations along the way.
From the graph:
-- The location of the object at time-zero, when time begins, is 10 meters.
-- The location of the object after 6.0 seconds is 4 meters.
-- The distance between the start-point and end-point is
(final location) - (initial location)
-- So Displacement = (4 meters) - (10 meters)
Displacement = -6 meters
The displacement of the object from starting to endpoint is
[tex]d=+6m[/tex]
From the question we are told that:
Displacement Time t=6sec
Displacement
Displacement is simply the distance between the starting point and the endpoint.We do not make reference to variant distances covered just the starting and endpoint.
Generally, the equation for Displacement is mathematically given by
[tex]D=x-y[/tex]
Where
x=starting point
y= endpoint.
Therefore
[tex]d=10-4[/tex]
[tex]d=+6m[/tex]
In conclusion
The displacement of the object from starting to endpoint is
[tex]d=+6m[/tex]
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