1. Is it possible that force is acting on a body but still work done is zero? Explain.
2. A rocket of mass3x10raise to the power of6kg takes off from a launching pad and acquires a vertical
velocity of 1km/s at an altitude of 25 km. calculate (a) the potential energy and (b) the
kinetic energy. (g = 9.8m/s2)
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ANS.1
Yes, it is possible.
For example:
If you push a wall you are applying force but there is no displacement of wall.
So work done which is equal to product of force and displacement will be zero.
ANS.2
Mass of the Rocket, m = 3×10⁶ kg
Velocity = 1 km/s = 1000 m/s
Altitude,h= 25 km = 25×1000m
=25000m
(a)Potential Energy=mgh
=3 × 10⁶ × 10 × 25000
= 75 × 10¹⁰ Joule
(b) Kinetic Energy = 1/2mv²
=1/2 × 3 × 10⁶ × (1000)²
= 1.5 × 10¹² Joule
HOPE THIS HELPS YOU!!!❤❤
ANS.1
Yes, it is possible.
For example:
If you push a wall you are applying force but there is no displacement of wall.
So work done which is equal to product of force and displacement will be zero.
ANS.2
Mass of the Rocket, m = 3×10⁶ kg
Velocity = 1 km/s = 1000 m/s
Altitude,h= 25 km = 25×1000m
=25000m
(a)Potential Energy=mgh
=3 × 10⁶ × 10 × 25000
= 75 × 10¹⁰ Joule
(b) Kinetic Energy = 1/2mv²
=1/2 × 3 × 10⁶ × (1000)²
= 1.5 × 10¹² Joule
HOPE THIS HELPS YOU!!!❤❤
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