WORK, POWER & ENERGY RT

• 10 units

• 18 units

• 11 units

• 15 units

A body of mass 5 kg, initially at rest, is moved by a force of 2 N on a smooth horizontal surface. The work done by the force in 10 s is

• 20 J

• 30 J

• 40 J

• 60 J

A body is displaced from x = x₁ to x = x₂ by a force of 2x. The work done is

• 2x (x_{2 –} x₁ )

• 2x₂ (x_{2 –} x₁ )

A 1 kg mass has a K.E. of 1 joule when its speed is

• 0.45 m/s

• 1 m/s

• 1.4 m/s

• 4.4 m/s

A body is lifted by a man to a height of 1 m in 30s. Another man lifts the same mass to the same height in 60s. The work done by them are in the ratio

• 1 : 2

• 1 : 1

• 2 : 1

• 4 : 1

Ratio of dimensions of power and K.E is

• 1 : 1

• T : 1

• 1 : T

• M : T

The expression for escape velocity is;

The power of a machine is one kilowatt when work is done by it at the rate;

• 1000J/min

• 500J/s

• 500 J/min

• 1000J/s

One horse power is equal to

• 476 Watt

• 1000 watt

• 746 watt

• 1 watt

Joule is the SI unit of which pair

• Force & Energy

• Power & energy

• Work & Energy

• Force & momentum