De Exercise 3
(Take g = 10 ms
1 A ball is projected horizontally from the top of a
hill with a velocity of 30 ms. If it reaches the
ground 5 seconds later, the height of the 11
IS:
A 200 m B. 125 m C 250 m
D 100 m E 65 m

In what direction does the medium move relative to the direction of the wave? explain.

A2000 kg car is rounding a curve of radius 200 m on a level road. the maximum frictional force the road can exert on the tires of the car is 4000 n. what is the highest speed at which the car can round the curve?

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.