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The $300 N$ crate slides down the inclined curved path from $A$ to $B$ in the vertical plane as shown in the figure. If the crate has a velocity of $1.2 m s^{- 1}$ down the inclined at point $A$ and $8 m s^{- 1}$ at $B .$ Find the work done against friction during the motion.

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Important Questions on Work, Energy and Power

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Gamma Question Bank for Engineering Physics>Chapter 5 - Work, Energy and Power>Exercise 5.2>Q 14

A block of mass

m

is suspended by a light thread from an elevator. The elevator is accelerating upward with uniform acceleration

' a' .

Work done during

t

s by the tension in the thread is

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Gamma Question Bank for Engineering Physics>Chapter 5 - Work, Energy and Power>Exercise 5.2>Q 15

A water pump is used to deliver the water at constant rate. By what factor power of pump should be increased to increase the rates

n

times?

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Gamma Question Bank for Engineering Physics>Chapter 5 - Work, Energy and Power>Exercise 5.2>Q 16

A car moving with a speed of

40 km h^{- 1}

can be stopped by applying brakes after at least

2 m .

If the same car is moving with a speed of

80 km h^{- 1} .

what is the minimum stopping distance ?

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Gamma Question Bank for Engineering Physics>Chapter 5 - Work, Energy and Power>Exercise 5.2>Q 17

An ideal spring is used to fire a

2 g

block horizontally across a frictionless table top. The spring has a spring constant of

80 N m^{- 1}

and is initially compressed by

3 cm .

The speed of the block as it leaves the spring is

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Gamma Question Bank for Engineering Physics>Chapter 5 - Work, Energy and Power>Exercise 5.2>Q 18

2 g

block attached to an ideal spring with a spring constant of

80 N m^{- 1}

oscillates on a horizontal frictionless surface. When the spring is

4.0 cm

shorter than its equilibrium length, the speed of the block is

\sqrt{17} m s^{- 1} .

The greatest speed of the block is

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Gamma Question Bank for Engineering Physics>Chapter 5 - Work, Energy and Power>Exercise 5.3>Q 19

For a block of mass $m$ to slide without friction up the rise of height $h$ shown, it must have a minimum initial speed of

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Gamma Question Bank for Engineering Physics>Chapter 5 - Work, Energy and Power>Exercise 5.3>Q 20

2.2 kg

block starts from rest on a rough inclined plane that makes an angle of

25 °

with the horizontal. The coefficient of kinetic friction is

0.25 .

As the block goes

2.0 m

down the plane, the mechanical energy of the Earth-block system changes by

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Gamma Question Bank for Engineering Physics>Chapter 5 - Work, Energy and Power>Exercise 5.3>Q 21

A simple pendulum consists of a $2.0 kg$ mass attached to a string. It is released from rest at $x$ as shown. Its speed at the lowest point $y$ is

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The 300 N crate slides down the inclined curved path from A to B in the vertical plane as shown in the figure. If the crate has a velocity of 1.2 m s–1 down the inclined at point A and 8 m s–1 at B. Find the work done against friction during the motion.

Important Questions on Work, Energy and Power

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The $300 N$ crate slides down the inclined curved path from $A$ to $B$ in the vertical plane as shown in the figure. If the crate has a velocity of $1.2 m s^{- 1}$ down the inclined at point $A$ and $8 m s^{- 1}$ at $B .$ Find the work done against friction during the motion.