### Physics Past Questions

41

At a fixed point below a liquid surface, the pressure downwards is P1 and pressure upwards is P2. It can be deduced that

• A. P1 > P2
• B. P1 ≥ P2
• C. P1 < P2
• D. P1 = P2
JAMB 2000
42
If the force and the velocity on a system are each reduced simultaneously by half, the power of the system is
• A. doubled
• B. reduced to a quarter
• C. reduced by half
• D. constant
JAMB 2000
43

A catapult used to hold a stone of mass 500g is extended by 20cm with an applied force F. If the stone leaves with a velocity of 40m/s, the value of F is

• A. 4.0 x 102N
• B. 2.0 x 103N
• C. 4.0 x 103N
• D. 4.0 x 104N
JAMB 2000
44

A stream is flowing at 0.75ms$$^{-1}$$ and a boat heading perpendicular for the stream landed at the opposite bank at an angle of 30°. Calculate the velocity of the boat.

• A. 1.50ms-1
• B. 1.00ms-1
• C. 0.86ms-1
• D. 0.65ms-1
JAMB 2000
45

A rope is being used to pull a mass of 10kg vertically upward. Determine the tension in the rope if, starting from rest, the mass acquires a velocity of 4ms$$^{-1}$$ in 8s [g = 10ms$$^{-2}$$]

• A. 5N
• B. 50N
• C. 95N
• D. 105N
JAMB 2000