Question 906:

• JAMB 1998

A uniform meter rule weighing 0.5N is to be pivoted on a knife-edge at the 30cm-mark. where will a force of 2N be placed from the pivot to balance the meter rule?

A. 95cm
B. 25cm
C. 20cm
D. 5cm

Question 907:

• JAMB 1998

A man whose mass is 80kg climbs a staircase in 20s and expends power of 120W. Find the height of the staircase.[g = 10ms^-2]

A. 1.8m
B. 2.0m
C. 2.5m
D. 3.0m

Question 908:

• JAMB 1998

A parachute attains a terminal velocity when

A. Its density is equal to the density of air
B. The viscous force of the air and the upthrust completely counteract its weight
C. It expands as a result of reduced external pressure
D. The viscous force of the air is equal to the sum of the weight and upthrust

Question 909:

• JAMB 1998

In a wheel and axle mechanism the diameters of the wheel and axle are 40cm and 8cm respectively. Given that the machine is 80% efficient, what effort is required to lift a load of 100N?

A. 20N
B. 25N
C. 50N
D. 80N

Question 910:

• JAMB 1998

The tendon in a man's leg is 0.01m long. If a force of 5N stretches the tendon by 2.0 x 10^-5m, calculate the strain on the muscle.

A. 5 x 10⁶
B. 5 x 10²
C. 2 x 10^-3
D. 2 x 10^-7