Physics P1a

Describe three ways that heat energy can be transferred.

True or false?

An object that is cooler than its surroundings emits more radiation than it absorbs.

Explain why solar hot water panels have a matt black surface.

Describe the arrangement and the movement of the particles in:
A) solids
B) Liquids
C) Gases

What is the name of the process where vibrating particles pass on their extra kinetic energy to neighbouring particles?

Which type of heat transfer cant take place in solids?

Describe how the heat from the heater coils is transferred throughout the water in the kettle.
What is this process called?

How do the densities of liquids and gases change as you heat them?

What happens to the particles of a gas as it turns into a liquid?

What is the name given to the process where a gas turns into a liquid?

Why does evaporation have a cooling effect on a liquid?

Describe two features of a vacuum flask that make it good at keeping liquids hot.

Do animals that live in hot climates have large or small ears?
Give one reason why this might be an advantage in a hot climate.

if it costs £4000 to double-glaze your house and the double-glaze saves you £100 per year, calculate the payback time.

Name five ways to improve energy efficiency in the home. Explain how each improvement reduces the amount of heat loss.

What can you tell from a materials U-value?

Would you expect copper or cotton wool to have a higher u-value?

What property of a material tells you how much energy it can store?

An ornament has a mass of 0.5kg. The ornament is made from a material which has a specific heat capacity of 1000j/kg degrees c. How much energy does it take to heat the ornament from 20 degrees to 200 degrees?

Do heaters use materials that have high or low heat capacities?

Name nine types of energy and give an example of each.

State the principle of conservation energy.

List the energy transformations that occur in a battery-powered toy car.

What is the useful energy delivered by a motor? In what form is energy wasted?

What is the efficiency of a motor that converts 100 J of electrical energy into 70 J of useful kinetic energy?

What are the standard units of electrical energy?

calculate how many kWh of electrical energy are used by a 0.5 kW heater used for 15 minutes.

Would a battery-powered radio or a clockwork radio be more suitable to use in rural Africa? why?