Question
A metal plate with a circular hole at the centre is
heated. What will happen to the area of the hole?Solution
Assuming the disc is uniform and isotropic (the same in different directions), the hole will expand in the same ratio as the metal. It is because the thermal expansion equation applies to all lengths associated with the metal, including the circumference of the hole, since the edge of the hole is made out of metal. And if the circumference of the hole expands, so does the diameter.
A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments –
Motion that repeats itself after some period of time, is called ______ motion.
A magnetic force does no work on a moving charged particle because:
The phenomenon of splitting white light into its component colors is called:
The energy flow in an ecosystem is always:
A liquid rises in a capillary tube due to:
Which of the following glands is both endocrine and exocrine?
The SI unit of force is:
In the given figure, frogs occupy ________.
