HARD
10th ICSE
IMPORTANT
Earn 100

A water lift pump of 0.5 H.P. is used to fill a water tank of capacity 500 litres. The height of the tank is 12 m. Assuming the efficiency of the pump 65%, calculate the time required to fill this tank.

Important Questions on Work, Energy and Power

HARD
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 3 - Work, Energy and Power>QUESTIONS>Q 20
A crane (efficiency 90%) does 2kW of work to lift a load up to the height of 10 m in 20 seconds. What is the mass of this load? If the load is dropped from this height, what would be its final kinetic energy? 
HARD
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 3 - Work, Energy and Power>QUESTIONS>Q 21
Show that K=p22m, where K is kinetic energy and p is momentum of a particle of mass m. 
HARD
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 3 - Work, Energy and Power>QUESTIONS>Q 22
A man of mass 60 kg runs up a height of 30 steps in 15 s. If each step is 20cm high, calculate the power developed by the man. Take g=10ms-2
MEDIUM
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 3 - Work, Energy and Power>QUESTIONS>Q 23

State with reasoning whether the work done in the following cases is positive or negative: A water bucket is pulled up from well

MEDIUM
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 3 - Work, Energy and Power>QUESTIONS>Q 23
State with reasoning whether the work done in the following case is positive or negative: A porter carrying a suitcase on his head on a level platform.
MEDIUM
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 3 - Work, Energy and Power>QUESTIONS>Q 23
State with reasoning whether the work done in the following case is positive or negative: A ball falling freely under gravity.
MEDIUM
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 3 - Work, Energy and Power>QUESTIONS>Q 23
State with reasoning whether the work done in the following case is positive or negative: Bob of the pendulum while moving towards mean position.
HARD
10th ICSE
IMPORTANT
S CHAND'S ICSE PHYSICS BOOK 2>Chapter 3 - Work, Energy and Power>QUESTIONS>Q 23
State with reasoning whether the work done in the following case is positive or negative: Bob of the pendulum while moving away from the mean position.