Question 346:

• JAMB 1985

Two masses 40g and 60g respectively, are attached firmly to the ends of the light meter rule. The center of gravity of the system is

A. At the mid-point of the meter rule
B. 40cm from the lighter mass
C. 40cm from the heavier mass
D. 60cm from the heavier mass
E. Indeterninate because the meter-rule is light

Question 347:

• JAMB 1985

A 0.05kg bullet travelling at 500ms^-1 horizontally strikes a thick vertical wall. It stops after penetrating through the wall horizontal distance of 0.25m. What is the magnitude of the average force the wall exerts on the bullet?

A. 25N
B. 50N
C. 250N
D. 500N
E. 25 000N

Question 348:

• JAMB 1985

A force of 100N stretches an elastic string to a total length of 20cm. If an additional force of 100N stretches the string 5cm further, Find the natural length of the string

A. 15cm
B. 12cm
C. 10cm
D. 8cm
E. 5cm

Question 349:

• JAMB 1985

Two divers G and H are at depths 20m and 40m respectively below the water surface in a lake. The pressure on G is P₁ while the pressure on H is P₂. If the atmospheric pressure is equivalent to 10m of water, then the value of \( \frac{p_2}{p_1} \) is

A. 0.50
B. 0.60
C. 1.67
D. 2.00
E. 3.0

Question 350:

• JAMB 1985

The areas of the effort and load pistons of a hydraulic press are 0.5m² and 5m² respectively. If a force F₁ of 100N is applied on the effort piston, the force F₂ on the load is

A. 10N
B. 100N
C. 500N
D. 1000N
E. 5000N