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An engine pumps water continuously through a hose. Water leaves the hose with a velocity $v$ and $m$ is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?

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Important Questions on Work, Energy and Power

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-3>Q 3

A block of mass

M

is attached to the lower end of a vertical spring. The spring is hung from the ceiling and has a force constant

k

. The mass is released from the rest with the spring initially unstretched. The maximum extension produced in the length of the spring will be

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-3>Q 4

An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of

2 m s^{- 1}

. The mass per unit length of water in the pipe is

100 kg m^{- 1}

. What is the power of the engine?

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-3>Q 5

A particle of mass

M,

starting from rest, undergoes uniform acceleration. If the speed acquired in time

T

V,

the power delivered to the particle is

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-3>Q 6

The potential energy of a system increases if work is done ?

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-3>Q 7

The potential energy of a particle in a force field is

U = \frac{A}{r^{2}} - \frac{B}{r}

where

A

and

B

are positive constants and

r

is the distance of particle from the centre of the field. For stable equilibrium, the distance of the particle is

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-3>Q 8

A car of mass

m

starts from rest and accelerates so that the instantaneous power delivered to the car has a constant magnitude

P_{0} .

The instantaneous velocity of this car is proportional to

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-3>Q 9

A block of mass

10 kg,

moving in

x

direction with a constant speed of

10 m s^{- 1},

is subject to a retarding force

F = 0.1 x J m^{- 1}

during its travel from

x = 20 m

30 m

Its final

KE

will be : ?

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-3>Q 10

Two similar springs

P

and

Q

having spring constants

K_{P}

and

K_{Q}

, such that

K_{P} > K_{Q}

. They are stretched, first by the same amount (case

a

), then by the same force (case

b

). The work done by the springs

W_{P}

and

W_{Q}

are related as, in case

(a)

and case

(b),

respectively

An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?

Important Questions on Work, Energy and Power

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An engine pumps water continuously through a hose. Water leaves the hose with a velocity $v$ and $m$ is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?