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Answer:
d = 105 m
Explanation:
Speed of a car, v = 21 m/s
We need to find the distance traveled by the dar during those 5 s before it stops. Let the distance is d. It can be calculated as :
d = v × t
d = 21 m/s × 5 s
d = 105 m
So, it will cover 105 m before it stops.
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The total mechanical energy is
Explanation:
The total mechanical energy (TME) of an object is equal to the sum of its gravitational potential energy (U) and its kinetic energy (K):
When the car is at rest 50 m above the ground, its speed is zero, therefore its kinetic energy is zero as well:
K = 0
This means that the TME is just equal to the gravitational potential energy:
where:
m is the mass of the car
is the acceleration of gravity
h is the height above the ground
For the car in the problem,
m = 575 kg
h = 50 m
Substituting,
Learn more about gravitational potential energy:
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Answer and Explanation:
This experiment is known as Lenz's tube.
The Lenz tube is an experiment that shows how you can brake a magnetic dipole that goes down a tube that conducts electric current. The magnet, when falling, along with its magnetic field, will generate variations in the magnetic field flux within the tube. These variations create an emf induced according to Faraday's Law:
This emf induced on the surface of the tube generates a current within it according to Ohm's Law:
This emf and current oppose the flux change, therefore a field will be produced in such a direction that the magnet is repelled from below and is attracted from above. The magnitude of the flux at the bottom of the magnet increases from the point of view of the tube, and at the top it decreases. Therefore, two "magnets" are generated under and above the dipole, which repel it below and attract above. Finally, the dipole feels a force in the opposite direction to the direction of fall, therefore it falls with less speed.