Work Energy and Power Test

Result

Work Energy and Power Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

A railway porter is holding a weight of 100 kgs on his head and is standing still. What is the work done by him?

A
0 J

B
200 J

C
1000 J

D
100 J

Solution

W = Force x displacement in the direction of force

Work done will be zero because porter is stationary (i.e. displacement is zero)
Question 2
1 / -0

Balram pushes 500kg weight on a horizontal frictionless surface a distance of 10 m. The work done by gravitational force is

A
200 J

B
0 J

C
100 J

D
5000 J

Solution

angle betwwen force and displacement is 90^∘

W=Fscos90^∘=0
Question 3
1 / -0

A weight of 20kg falls from a height of 10 m. The work done by the gravitational force is (Take g = 10 m s⁻²)

A
1500 J

B
2000 J

C
3000 J

D
2500 J

Solution

W = F s cosθ = mghcos0^∘

W = 20 × 10 × 10 × 1 = 2000J
Question 4
1 / -0

A rain drop of mass 2.00 g falls from a height 1.00 km. It hits the ground with a speed of 50.0 m/s. What is the work done by the gravitational force? (Take g = 10 m s⁻²)

A
22 J

B
26 J

C
20 J

D
24 J

Solution

W=F s cosθ = mghcos0^∘

W = 2 × 10 − 3 × 10 × 1000 × 1 = 20J