Question 671:

• JAMB 1992

A stone, Q is thrown with velocity U at an angle of 75^o to the horizontal. Another stone R is thrown with the same velocity U but with an angle of 15^o to the horizontal. The ranges covered by the stones will be

A. Greater for Q
B. Greater for R
C. The same for Q and R
D. Greater for the heavier of the two stones

Question 672:

• JAMB 1992

A man weight 800N climbs up a stairs to height of 15m in 12.5s. What is the man''s average power output?

A. 667W
B. 810W
C. 960W
D. 15000W

Question 673:

• JAMB 1992

A machine requires 1000J of work to raise a load of 500N through a vertical distance of 1.5m. Calculate the efficiency of the

A. 80%
B. 75%
C. 50%
D. 33%

Question 674:

• JAMB 1992

In an experiment to determine Young's Modulus for a wire, several loads are attached to the wire and the corresponding extension measured. The tensile stress in each case depends on the

A. Load and the extension
B. Load and the radius of the wire
C. Radius of the wire and the extension
D. Extension and the original length of the wire

Question 675:

• JAMB 1992

If a plastic sphere floats in water (density = 1000kgm³) with 0.5 of its volume submerged, and floats in oil with 0.4 of its volume submerged the density of the oil is

A. 800kgm³
B. 1200kgm³
C. 1250kgm³
D. 2000kgm³