Physics Past Questions and Answers

An object A is held in equilibrium as illustrated in the diagram above. Using the data on the diagram determine the magnitude, W of the weight of

A 23N
B 17N
C 7N
D 5N

Question 3047:

A spiral spring of natural length 30.0cm and force constant of 20Nm^-1 is compressed to 20.0cm. Calculate the energy stored in the spring

A 0.1J
B 1.0J
C 10.0J
D 100.0J

Question 3048:

In the diagram above, AB represents a uniform rod of length 1.50m which is in equilibrium on a pivot at P, If AP = 40cm, calculate the mass of the rod. [g = 10ms^-2]

A 0.280kg
B 0.400kg
C 0.613kg
D 0.800kg

Question 3049:

Which of the following statements correctly defines quantitatively the work done by a force? the product of the force and the distance moved

A Parallel to the line of action of the force from a reference point
B Perpendicular to the line of action of the force from a reference point
C On a line through the reference point
D By the object

Question 3050:

a load of mass120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms^-2]

A 60W
B 80W
C 100W
D 120W