Both kinetic energy and potential energy

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At what temperature do the Fahrenheit and Celsius scales give the same reading?

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Important Questions on Work, Energy and Power

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

A stone of mass

m

, tied to a string is being whirled in a vertical circle with a uniform speed. The tension in the string is

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

The potential energy of a system increases if work is done

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

Two cars (A) and (B) of the same mass start from the same location at the same time but on different straight roads. Car (A) travels on a road that has a greater angle of inclination with horizontal compared to the road on which (B) travels. At any instant, both cars A and B have the same height above the starting point. If

E_{A}

and

E_{B}

are total energies of cars (A) and (B) respectively, them

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

What gases are produced in anaerobic sludge digesters?

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

A heavy mass is attached at one end of a thin wire and whirled in a vertical circle. The chances of breaking the wire are maximum when

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

In the given figure, the block of mass $m$ is dropped from the point $A$ . The expression for kinetic energy of block when it reaches point $B$ is

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

The bob of a simple pendulum of length

4 m

is held so that the string is horizontal and then let go. The velocity of the bob when it reaches the lowest position is (Take

g = 9.8 m s^{- 2}

)

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

Flying birds has

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

A body is released from a height of

30 m

vertically downwards. The speed of the body at which potential energy is twice that of kinetic energy is (Acceleration due to gravity

= 10 m s^{- 2}

)

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

A large block of wood of mass $M = 5.99 kg$ is hanging from two long massless cords. A bullet of mass $m = 10 g$ is fired into the block and gets embedded in it. The (block $+$ bullet) then swing upwards, their center of mass rising a vertical distance $h = 9.8 cm$ before the (block $+$ bullet) pendulum comes momentarily to rest at the end of its arc. The speed of the bullet just before the collision is: (Take $g = 9.8 {m s}^{- 2}$ )

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

Uranium is used to obtain:

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

A particle is released on a vertical smooth semicircular track from point

X

so that,

O X

makes angle

θ

from the vertical (see figure). The normal reaction of the track on the particle vanishes at the point

Y

where

O Y

makes an angle

ϕ

with the horizontal. Then

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

An object of mass

15 kg

is moving with uniform velocity of

4 m / s

. What is the kinetic energy possessed by the object?

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

What is the minimum velocity with which a body of mass m must enter a vertical loop of radius

R

so that it can complete the loop?

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

Which one of the following is an example of Biomass energy source.

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

Ratio of potential energies of body A and body B will be

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

Which of the following graphs best represent the graphical relationship between Kinetic Energy

(K . E)

and momentum

(P)

of a body in motion?

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

A sphere of mass $' m'$ is attached to a spring of spring constant $' k'$ and is held in unstretched position over an inclined plane as shown in the figure. After letting the sphere go, find the maximum length by which the spring extends, given the sphere only rolls.

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

Hydrogen ion and singly ionized helium atom are accelerated, from rest, through the same potential difference. The ratio of final speeds of hydrogen and helium ions is close to:

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General Science>Physics>Work, Energy and Power>Various Forms of Energy and Law of Conservation of Energy

For a particle moving in vertical circle, the total energy at different positions along the path.

At what temperature do the Fahrenheit and Celsius scales give the same reading?

Important Questions on Work, Energy and Power

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