In a double-decker bus there are two passenger compartments, one above the other.
A bus is travelling along a straight road. The bus and the driver have a combined mass of 16000 kg when there are no passengers in it. The bus has 73 passengers. The average mass of each of the passengers is 65 kg .
Calculate the total mass of the bus, the driver and the 73 passengers.
Fig. 2.1 shows an electric tumble dryer used to dry wet clothes.
Fig. 2.1
The drum of the tumble dryer rotates, lifting up the wet clothes which then fall down through the hot air.
Name the force that causes the clothes to fall down.
An object is taken from the Earth to the Moon.
The acceleration of free fall is on the Earth and is on the Moon.
Which row describes the mass and the weight of the object on the Moon compared to on the Earth?
mass
weight
greater than on the Earth
same as on the Earth
less than on the Earth
same as on the Earth
same as on the Earth
greater than on the Earth
same as on the Earth
less than on the Earth
Two rectangular blocks consist of different materials.
Four different methods are suggested to compare the two masses.
1 Compare the accelerations with which they fall freely.
2 Compare the values of their lengths × breadths × heights.
3 Hang each in turn from the same spring. Compare the extensions.
4 Place one in the right-hand pan of a beam balance and the other in the left-hand pan.
Which methods give a comparison of the two masses?
1, 2 and 3
1 and 2 only
3 and 4 only
4 only
Which property of a body results from the effect of a gravitational field on its mass?
the ability of the body to resist a change in motion
the density of the body
the volume of the body
the weight of the body