1- Gravity on the surface of Mars is 4m/s^2, which is 40% of the gravity on the

Question

1- Gravity on the surface of Mars is 4m/s^2, which is 40% of the gravity on the Earth?

a- what is the weight of a 200kg object on the Earth?

b- what is its weight of the same object on Mars?

c-what is the mass of the same object on Mars?

2- Will a superconducting magnet use less electric power than a traditional copper-wire electromagnet of the same field strength? Defend your answer.

3- I drop a 4km pumpkin from the top of a building. the top of the building is 30-m high. Ignore air resistance. How much time does the pumpking take to hit the ground? explain please

Explanation / Answer

1) gm = 4m/s^2

acceleration due to gravity g = 9.8 m/s^2

a) w =mg = 2000*9.8 = 19600 N

b) weight on mars = 2000*4 =8000N

c) Mass is does not change . m = 2000kg

2) Yes, super conducting material means it have very less resistance to oppose the motion of electrons.

So it needs less electric power

P =i^2 R

3) s =ut +(1/2)at^2

30 = 0+(1/2)9.8t^2

t =[60/9.8]^1/2

t = 2.47 s

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