A block is on a frictionless table, on earth. The block accelerates at 3.0 m/s2

Question

A block is on a frictionless table, on earth. The block accelerates at 3.0 m/s2 when a 20 N horizontal force is applied to it. The block and table are set up on the moon. The acceleration due to gravity at the surface of the moon is 1.62 m/s2. The weight of the block on the moon is closest to:        A) 11 N.
       B) 9.5 N.
       C) 8.1 N.
       D) 6.8 N.
       E) 5.5 N. A man pushes against a rigid, immovable wall. Which of the following statement is the most accurate        A) The man can never exert a force on the wall which exceeds his weight.
       B) If the man pushes on the wall with a force of 200 N, we can be sure that the wall is pushing back with a force of exactly 200 N on him.
       C) Since the wall cannot move, it cannot exert any force on the man.
       D) The man cannot be in equilibrium since he is exerting a net force on the wall.
       E) The friction force on the man's feet is always directed to the left. A block is on a frictionless table, on earth. The block accelerates at 3.0 m/s2 when a 20 N horizontal force is applied to it. The block and table are set up on the moon. The acceleration due to gravity at the surface of the moon is 1.62 m/s2. The weight of the block on the moon is closest to:        A) 11 N.
       B) 9.5 N.
       C) 8.1 N.
       D) 6.8 N.
       E) 5.5 N.

Explanation / Answer

part A )

given on moon accelaration is g = 3.0 m/s2

the force on it is F = 20N

then F = m g

so 20 = m X 3

m = 20/3

m = 6.66 kg

same thing now the block is on moon

F = m g

F = 6.6666667 X 1.62

F = 10.8

So nearly the weight of the block coses to 11N

part b)

A man pushes against a rigid, immovable wall.

statement 'B" corect..

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