A wheel and axle have radii 80cm and 10cm respectively. If the efficiency of the machine is 0.85, an applied force of 1200N to the wheel will raise a load of
- A. 8.0N
- B. 6.8N
- C. 8160N
- D. 9600N
A spring of force constant 1500Nm-1 is acted upon by a constant force of 75N. Calculate the potential energy stored in the string
- A. 1.9J
- B. 2.8J
- C. 3.45J
- D. 0.43J
A body of mass 100g moving with a velocity of 10.0ms-1 collides with a wall. If after collision, it moves with a velocity of 2.0ms-1 in the opposite direction, calculate the change in momentum.
- A. 0.8Ns
- B. 1.2Ns
- C. 12.0Ns
- D. 80.0Ns
An object moves with uniform speed round a circle. Its acceleration has
- A. constant magnitude and constant direction
- B. constant magnitude and varying direction
- C. varying magnitude but constant direction
- D. varying magnitude and varying direction
A small metal ball thrown vertically upwards from the top of a tower with an initial velocity of 20ms-1. If the ball took a total of 6s to reach ground level, determine the height of the tower [g = 10ms-2]
- A. 60m
- B. 80m
- C. 100m
- D. 120m
A body of weight W N rest on a smooth plane inclined at an angle\(\theta\)o to the horizontal. What is the resolved part of the weight in Newtons along the plane?
- A. W sin\(\theta\)
- B. W cos\(\theta\)
- C. W sec\(\theta\)
- D. W tan\(\theta\)
Which of the following is the most suitable for use as an altimeter?
- A. A mecury barometer
- B. A fortin barometer
- C. A mecury manometer
- D. An aneroid barometer