JEE PHYSICS MCQ: WORK-ENERGY-POWER

1 Medium

1 of 1

Application +4 | -1

Suppose the average mass of raindrops is

3 \times 10^{-5} {~kg}

and their average terminal velocity

9 {~ms}^{-1}

. Then the energy transferred by rain to each square metre of the surface at a place which receives

100 {~cm}

of rain in a year is

View answer and explanation

Correct option: C

4.05 \times 10^4 {~J}

Option C (

4.05 \times 10^4 {~J}

) is correct because it is the kinetic energy transferred by the rain to each square meter of the surface, calculated using the mass of water and its terminal velocity.

More Questions from WORK-ENERGY-POWER

Practice All Chapter MCQs →

A ball throwing cannon, lifts ball and throws with

72 \mathrm{~km} / \mathrm{hr}

Speed. If balls are raised upto

10 \mathrm{~m}

. then find Input power of cannon if it lifts 8 balls per minute and its efficiency is

80 \%

. Mass of each ball is

1 \mathrm{~kg}

. Assertion:When a particle moves in a circle with a uniform speed its acceleration is constant but the velocity changes.
Reason: Angular displacement is not an axial vector. A body of mass

m

thrown vertically upwards attains a maximum height

h

. As what height will its kinetic energy be

75 \%

of its initial value? Assertion: Centripetal force does no work.

Reason: Force and displacement are perpendicular to each other. Statement I: Both stretched and compressed springs possess potential energy.

Statement II: Work done against restoring force is stored as potential energy. A bullet of mass

m

moving at a speed

v

hits a ball of mass

M

kept at rest. A small part having mass

m^{\prime}

breaks from the ball and sticks to the bullet. The remaining ball is found to move at a speed

v_1

in the direction of the bullet. Find the velocity of the bullet after the collision.