In a hydraulic press, the pump piston exerts a pressure of 100 pa on the liquid. what force is exerted in the second piston of cross sectional area 3 m2?
- A. 300 N
- B. 200 N
- C. 150 N
- D. 100 N
If a wire 30 cm long is extended to 30.5 cm by a force of 300 N. find the strain energy of wire
- A. 0.75 J
- B. 7.50 J
- C. 75.00 J
- D. 750.00 J
A machine of velocity ratio 6 requires an effort of 400 N to raise a load of 800 N through I m. Find the efficiency of the machine
- A. 55. 6 %
- B. 50.0%
- C. 33.3%
- D. 22.2%
The surfaces of conveyor belts are made rough so as to?
- A. protect them while carrying loads
- B. prevent the loads from slipping
- C. enable them to carry more load
- D. make them stronger
A car moves with an initial velocity of 25 ms-1 and reaches a velocity of 45 ms-1 in 10s. what is the acceleration of the car?
- A. 2 ms-2
- B. 5 ms-2
- C. 20 ms-2
- D. 25 ms-2
A stone and a feather are dropped from the same height above the earth surface. Ignoring air resistance, which of the following is correct?
- A. the feather will be blown away by the wind while stone will drop steadily
- B. the stone and the feather will both reach the ground at the same time
- C. the feather will reach the ground first
- D. the stone will reach the ground first
Two cars moving in the same direction have speeds of 100 kmh-1 and 130 kmh-1 what is the velocity of the faster car as measured by an observer in the slower car?
- A. 30 kmh-1
- B. 130 kmh-1
- C. 200 kmh
- D. 230 kmh-1