A net force of magnitude 0.6N acts on a body of mass 40g, initially at rest. Calculate the magnitude of tire resulting acceleration.

• A. 90ms^-2
• B. 60ms^-2
• C. 30ms^-2
• D. 15ms^-2

The diagram below illustrates the path ABC, in a vertical x z plane, of a bullet shot into the air at an angle above the horizontal. Copy the diagram, and, using arrows, indicate the relative magnitudes and directions of the vertical and horizontal components of the velocities of the bullet at the point A, B and C.

Ripples on water and light waves are similar because both?

• A. have the same frequency
• B. can be refracted and diffracted
• C. are longitudinal waves
• D. have the same velocity

During the transformation of matter from the solid to the liquid state, the heat supplied does not produce a temperature increase because

• A. the heat energy is quickly conducted away
• B. the heat capacity has become very large as the substance melts
• C. the heat gained is equal to the heat lost by the substance
• D. all the heat is used to break the bonds holding the molecules of the solid together

A quantity of steam at 100^oC condenses to water at the same temperature by releasing 6.9 x 10⁴J of energy. Calculate the mass of the condensed steam. [specific latent heat of vaporization of eater = 2.3 x 10⁶ J kg^-1]

• A. 3.0 x 10^-1 kg
• B. 3.0 x 10^-2 kg
• C. 3.0 x 10^-3 kg
• D. 3.0 x 10^-4 kg

What is the acceleration due to gravity 'g' on the moon, if g is 10^-2 on the earth?

• A. 0. 10 ms^-2
• B. 0.74ms^-2
• C. 1.6ms^-2
• D. 10.00ms^-2

Which of the following obeys Ohm's Law?

• A. Glass
• B. Diode
• C. All electrolytes
• D. All metals

A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10ms^-2]. Determine the potential energy of the body at the maximum height of its motion

• A. 0.36J
• B. 0.72J
• C. 360.00J
• D. 720.00J

Electricity is supplied to a school along a cable of total resistance 0.5\(\Omega\) with the maximum current drawn from the mains as 100A. The maximum energy dissipated as heat for 1 hr is

• A. 3.6 x 10³J
• B. 5.0 x 10³J
• C. 3.0 x 10⁵J
• D. 1.8 x 10⁷J

The efficiency of a wheel and axle is 100% and the ratio of their radii is 5:1. calculate the effort required to lift a load of mass 20kg using this machine, [g = 10 m s^?2]

• A. 20N
• B. 25N
• C. 40N
• D. 100N