Answer: the most potential energy == 5 kg book, 2 m from the ground= 98 Joules
Explanation:
potential energy = m g h
m = mass
g = acceleration due gravity = 9.8 m/s²
h = distance above ground
1. Pe₁ = 1 kg x 2 m x g = 2 g
2. Pe₂ = 5 kg x 2 m x g = 10 g = 10 kg m x 9,8 m/s² = 98 Joules
3. Pe₃ = 1 kg x 0,5 m x g = 0,5 g
4. Pe₄ = 5 kg x 0.5 m x g = 2,5 g
10 > 2,5 > 2 >0,5
It is D 14 MS. West. Kauehfbfnd
The force between two parallel wires carrying currents in the same direction is attractive. It is repulsive if the currents are in opposite directions.
Part a)
Power rated on the elevator is given as

now the mass that is lifted above is given as

height of the elevator lifted is

now the potential energy is given as


now power is defined as rate of energy



so it will take 13.5 s to lift up
Part b)
Electrical energy used




so electrical energy used in this process will be 120050 J