An echo is returned in 3 s. What is the distance of the reflecting surface from the source, considering the speed of sound as 342 ms-1?
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The centre of the reflecting surface of a spherical mirror is a point called the ___.
Which object converts electricity to light?
Bulb converts electricity to light whereas solar panel is the device which converts light to electricity.
A compressed spring possesses more energy than a spring of normal length because the compressed spring has
Calculate the work done by the force of gravity when a satellite moves in an orbit of radius 40,000 km around the earth.
For what is Mohs scale used?
A ball, thrown vertically upward, rises to a height of 80 m and returns to its original position. The magnitude of its displacement after 7 s of motion will be ____. (take g = 10 m/s2)
An object weighing 20 kg is raised through a height of 2 m. What will be the work done by the force of gravity in this process?
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