Physics-Work, Energy, 2A, 2B

A body of mass 8 kg is taken from a height 9 m to 13 m. Find change in P.E ? ( g = 9.8 m/s2 )

• 312 J

• 313 J

• 314 J

Charging A battery is conversion of energy from___

• Chemical To Electrical

• Electrical to Heat Energy

• Electrical to Chemical

A man exerts a force of 400 N in pulling a cart at a constant speed of 15 m/s . Calculate The Power?

• 6000 W

• 26.66 W

• 4600 W

Express 7 kWh into joule.

A Man weighing 350 N climbs up 30 steps. each 20 cm high in 1 minute. Calculate Work Done & Power

Answer explanation

The work done is calculated by multiplying force by distance, which is 350 N * 6000 cm = 210000 Ncm = 2100 J. Power is work done divided by time, so 2100 J / 60 s = 35 W. Therefore, the correct answer is 2100 J & 35 W.

A water pump raises 70 litre of water through a height of 30 m in 6 s. Calculate the power? ( g = 10 m/s²)

• 3400 W

• 
  3590 J

• 3500 W

The Energy possessed by body by virtue of its position is called ______

• P. E

• 
  K. E

• M. E

What is the relation between Kinetic Energy and Momentum ?

A Vehicle weighing 2000 kgf changes its speed from 72 km/h to 90 km/h in just 2 minutes. Calculate (i) The work done by the engine (ii) Its Power ( g= 10 m/s²)

A body of Mass 80 kgf has momentum of 4000 km m/s. Calculate the K. E and the speed of a body?