Question 576:

• JAMB 1990

To keep a vehicle moving at a constant speed v, requires power P, from the engine. The force provided by the engine is

A. \(\frac{p}{v}\)
B. \(\frac{1}{2}\) v
C. Pv
D. \(\frac{p}{v^2}\) v

Question 577:

• JAMB 1990

A stone of mass m kg is held h meters above the floor for 50s. The work done in joules over this period is

A. Mh
B. Mgh
C. \(\frac{mgh}{50}\)
D. O

Question 578:

• JAMB 1990

A body of mass 10kg rests on a rough inclined plane whose angle of tilt \(\theta\) is variable. \(\theta\) is gradually increased until the body starts to slide down the plane at 30^o. The coefficient of limiting friction between the body and the plane

A. 0.30
B. 0.50
C. 0.58
D. 0.87

Question 579:

• JAMB 1990

An inclined plane which makes an angle of 30^o with the horizontal has a velocity ratio of

A. 2
B. 1
C. 0.866
D. 0.50

Question 580:

• JAMB 1990

What is the length of liquid column in a barometer tube that would support an atmospheric pressure of 102000Nm^-2 if the density of the liquid is 2600kgm^-3? [g = 10ms^-2]

A. 0.75m
B. 0.76m
C. 3.92m
D. 39.23m