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प्रश्न
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उत्तर
The work done by the gravitational force of the earth on a satellite revolving around the earth is zero because the motion of the satellite is perpendicular to the force at every point.
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संबंधित प्रश्न
What are the two kinds of mechanical energy?
Give reasons for the following A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work.
A car is running at a speed of 15 km h-1 while another similar car is moving at a speed of 45 km h-1. Find the ratio of their kinetic energies.
A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
Explain by an example that a body may possess energy even when it is not in motion.
A bullet is of mass 'm' g and is moving with a velocity 'v' m/s. Find the kinetic energy of the bullet when
(a) The mass is doubled,
(b) The velocity is tripled.
A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.
Is power a scalar or a vector quantity?
