Post Utme Physics Past Questions and Answers

Question 496:

A pile driver of mass 125 kg falls through a height of 80 m before striking the pile.
What is its momentum at the instance it strikes the pile? g = 10m/s2.

A. 40 kg.m/s
B. 5000 kg.m/s
C. 1600 kg.m/s
D. 5000 I'm/s

Question 497:

A gun weighing 1500kg fires a shot weighing 50kg with a velocity 360 m/s.
What is the recoil velocity of the gun?

A. 14.0 m/s
B. 12.0 m/s
C. 11.0 m/s
D. 13.0 m/s

Question 498:

At what temperaure will the volume of a given ideal gas be three times its volume at \(0 OC\) ?

A. \(2730 C\)
B. \(3000 C \quad\)
C. \(5460 C \quad\)
D. \(8190 C\)

Question 499:

A rectangular metal block of volume \(10-6 m 3\) at 273 \(K\) is heated to \(573 K\). If its coefficient of linear expansion is \(12 \times 10-5 / K\).
what is the percentage change of its volume?

A. 18
B. \(1.8\)
C. \(1.08\)
D. \(1.2\)

Question 500:

Calculate the time taken, in minutes, to heat \(2.0 kg\) of water from \(30 \circ C\) to \(100 \circ C\) in an electric kettle that draws a cument of \(3.0 A\) from \(240 V\) supply.
(Specific heat capacity is \(4.2 \times 103 J / kg\) ) neglect heat losses to the surrounding.

A. 0.2
B. 1.9
C. 3.6
D. 21.2