Revision G11 Topics

What is the unit for the internal energy of a gas, in base units?

• kg m s^–2

• kg m²s^–2

• kg m²s^–2K^–1

• kg m²s^–2K

A cyclist travels around a corner and changes his velocity from that shown by vector X to that shown by vector Y.

Which vector shows the change in velocity, (Y – X)?

• A

• B

• C

• D

A determination of the density of a metal is carried out using a cube of the metal. The lengths of the sides of the cube were all measured as (4.147 ± 0.002) cm. The mass of the cube was measured as (490.3 ± 0.5) g.

How should the density of the metal be quoted?

• (6.9 ± 0.02) × 10³kg m^–3

• (6.87 ± 0.01) × 10³kg m^–3

• (6.87 ± 0.02) × 10³kg m^–3

• (6.8748 ± 0.0170) × 10³kg m^–3

An object is dropped from rest on the Moon, where the acceleration due to gravity is 1.62 ms^–2.

How far does it fall between the end of the third second and the end of the fourth second after its release?

• 0.81 m

• 4.86 m

• 5.67 m

• 8.71 m

A water supply pipe has an internal diameter of 2.5 cm. The speed of the water in this pipe is 83 cm s^–1. This pipe is directly connected to another pipe of internal diameter 1.9 cm.

What is the speed of the water in the 1.9 cm diameter pipe?

• 48 cm s^–1

• 63 cm s^–1

• 109 cm s^–1

• 143 cm s^–1

1 A sketch graph of stress against strain for copper is shown below.

Identify from the graph the correct labels for the breaking point and the limit of proportionality.

• A

• B

• C

• D

A satellite of mass 370 kg travels from a position at a distance of 7200 km from the centre of the Earth to a point at a distance of 42 000 km from the centre of the Earth. The mass of the Earth is 6 × 10²⁴ kg.

What is the increase in the gravitational potential energy of the satellite?

• 1.7 × 10¹⁰ J

• 4.3 × 10⁹ J

• 7.3 × 10⁷ J

• 1.7 × 10⁷ J

A ship of total mass 13 000 tonnes is travelling with a velocity of 8.3 m s^–1 in a straight line.

What is the momentum of the ship and how long will it take to stop against a resistive force of 65 000 N?

• A

• B

• C

• D

At a particular moment five molecules in a container have speeds 356 m s^–1, 459 m s^–1, 127 m s^–1, 944 m s^–1 and 389 m s^–1.

What is the root mean square speed of these five molecules?

• 236 m s^–1

• 416 m s^–1

• 455 m s^–1

• 528 m s^–1

An ideal gas is in a container of volume of 0.0785 m³. It contains 3.26 × 10²⁴ molecules. The temperature of the gas is 146 °C.

What is the pressure in the container?

• 1.48 kPa

• 44.4 kPa

• 83.7 kPa

• 240 kPa