A ball bearing is gently released from rest and allowed to fall through a viscous fluid. Which of the following statements about the motion is correct?
- A. its acceleration decreases before terminal velocity is attained
- B. when terminal velocity is attained the acceleration of the fluid becomes zero
- C. its velocity increases before terminal velocity is attained
- D. there is no resultant force on the ball before it attains terminal velocity
A wooden block of mass 1.6kg rests on a rough horizontal surface if the limiting friction force between the block and the surface is 8N. Calculate the coefficient of friction. (g = 10ms-2)
- A. 0.6
- B. 0.5
- C. 0.3
- D. 0.2
The apparent weight of a body wholly immersed in water is 32N and its weight in air is 96N. Calculate the volume of the body. (Density of water = 1000kgm-3, g = 10ms\(^{-2}\))
- A. 8.9 x 10-3m3
- B. 6.4 x 10-3m3
- C. 3.2 x 10-3m3
- D. 3.0 x 10-3m3
A uniform cylindrical hydrometer of mass 20g and cross sectional area 0.54cm2 floats upright in a liquid. If 25cm of its length is submerged, calculate the relative density of the liquid. (Density of water = 1 gcm-3)
- A. 1.54
- B. 1.48
- C. 1.25
- D. 0.80
An iron rod is moved from the earth to the moon. Which of the following properties of the rod would remain unchanged? i. mass ii. weight iii. relative density
- A. i only
- B. ii only
- C. iii only
- D. i and iii only
The diagram above illustrates three forces T\(_1\), T\(_2\) and 100N in equilibrium. Determine the magnitude of T\(_1\).
- A. 100 tan 30o
- B. \(\frac{100}{\cos 30^o}\)
- C. 200 sin 301
- D. \(\frac{200}{tan 30^o}\)