g8 generla

G10, Physics First

1. Fill in the blanks. (5 marks)
   (1) The value of gravitational on a body of mass 1 kg gives it an acceleration of ……… .
   (5) The unit of work in British system is ………. .
2. Define “work”? A child pulling a toy car with a 10N force. The direction of the force makes an
   angle of 20° with the horizontal plane. If the car moves 6 m, how much work does the child do?
   3.Define the coefficient of volume expansion. A heat resistance glass at 15℃ is fully filled
   with 250 cm3 of glycerine. If the temperature increase to 25 ℃ how much glycerine overflows? The
   coefficient of volume expansion of glycerine is 5.1 x 10-4K-1 and that of heat resistance glass is
   0.09 x 10-4K-1.
3. A lift weighing 200lb is pulled up by a cable of tension 5000lbl Find the mass of the lift and its upward
   acceleration. Which is more difficult to move a wooden box or a big stone? Why?
   5.Is if correct to describe Newton’s second law in symbols as F α a?.
   A 3 ton car moving with the velocity of 30 mi h-1 is brought to stop in 2 s. Find the resisting force of the
   brakes acting on the car.