Physics Past Questions and Answers

The mass on a loaded spiral spring oscillates vertically between two extreme positions P and R equidistant from the equilibrium position Q. Which of the following statements about the system is not correct

A The momentum of the mass is maximum at Q
B The elastic potential energy of the spring is maximum at Q
C The kinetic energy of the mass is maximum at P
D The total energy of the system is always constant

Question 897:

A ball f mass 5.0kg hits a smooth vertical wall normally with a speed of 2ms^-1. Determine the magnitude of the resulting impulse

A 2.0kgms^-1
B 10.0kgms^-1
C 5.0kgms^-1
D 2.5kgms^-1

Question 898:

Which of the following statements correctly defines a simple machine? a device

A That can provide electric current
B Which can only carry people from one place to another
C With which work can be done easily
D Which changes the state of rest or of uniform motion of an object along a straight ine

Question 899:

A platinum resistance thermometer has a resistance 4\(\Omega\) at 0^oC and 100\(\Omega\) at 100^oC. Assuming the resistance changes uniformly with temperature. Calculate the resistance of the thermometer when the temperature is 45^oC

A 14.0\(\Omega\)
B 6.7\(\Omega\)
C 3.2\(\Omega\)
D 2.7\(\Omega\)

Question 900:

a metal rod of length 100cm is heated through 100^oC, calculate the change in length of the rod [linear expansivity of the material of the rod is 3 x 10^-6K^-1]

A 4mm
B 3mm
C 2mm
D 1mm