Energy

Small smoke particles suspended in air are viewed through a microscope. The smoke particles move randomly. What does this show?

What source of energy involves the splitting of heavy atoms?

A coal-fired power station generates electricity. Coal is burnt and the energy released is used to boil water. The steam from the water makes the generator move and this produces electricity. What energy stored in coal?

A gas is stored in a sealed container of constant volume. The temperature of the gas increases. This causes the pressure of the gas to increase. What happens to the kinetic energy of the gas molecules during this pressure increase?

A skier walks from the bottom of a ski slope to the top and gains 10 000 J of gravitational potential energy. She skis down the slope. At the bottom of the slope, her kinetic energy is 2000 J. How much energy is dissipated?

An energy source formed from the decomposition of dead organisms.

Look at the picture! The mass of the package is 36 kg. Calculate the increase in the gravitational potential energy (g.p.e.) of the package when it is raised through a vertical height of 2.4 m.

A measurement of the amount of power an electrical current has.

Molecules escape from a liquid during evaporation. The temperature of the remaining liquid changes. Which molecules escape and how does the temperature change?

A car tyre has a constant volume. Why does the pressure of the air in the tyre increase when its temperature increases?

The basic unit of matter.

One of the particles found in an atom.

In 5.0 s, 0.019 kg of water flows through the tubes. The temperature of the water increases from 20 °C to 72 °C. The specific heat capacity of water is 4200 J / (kg °C).Calculate the thermal energy gained by the water in 5.0 s.

A cyclist travels down a hill from rest at point X, without pedalling. The cyclist applies his brakes and the cycle stops at point Y. Which energy changes have taken place between X and Y?

The amount of energy used by devices in your home in a month is measured in

A cylinder of constant volume contains a fixed mass of gas. The gas is cooled. What happens to the pressure of the gas and what happens to the kinetic energy of the gas molecules?

A cup contains hot liquid. Some of the liquid evaporates. What happens to the mass and what happens to the weight of the liquid in the cup?

A material whose atoms transfer, or “share,” electrons easily with other atoms.

State the form of energy stored due to the stretching of the surface of the trampoline

A rifle fires a bullet of mass 0.020 kg vertically upwards through the air. As it leaves the rifle, the speed of the bullet is 350m/ s. Calculate the kinetic energy of the bullet as it leaves the rifle!

A material whose atoms do not transfer, or “share,” electrons easily.

What form of energy is used to generate electrical energy in a tidal power station?

An electric generator converts _______________ energy into electrical energy

The temperature of the gas in a container is increased. What happens to the pressure of the gas, and what happens to the speed of the gas molecules?

A device that moves a magnet near a wire to create a steady flow of electrons

A coal-fired power station generates electricity. Coal is burnt and the energy released is used to boil water. The steam from the water makes the generator move and this produces electricity. What energy in moving generator?

Complete the equation for the final pressure p2 of the gas when the gas is compressed at a constant temperature. p2 =

What is the major drawback or risk of nuclear energy production?

The models of train has a mass of 2.5 kg, it stopped by compressing a spring in the buffer. After the train has stopped, the energy stored in the spring is 0.48 J. Calculate the initial speed v of the train.

A man is working on a platform. He uses a rope to raise a bag from the ground to the platform as shown in the diagram. State the type of energy gained by the bag as it is lifted at a constant speed!

The ability to do work.

What energy transfer takes place when a matchstick burns?

A resource that can be replaced or replenished at a rate equal to or faster than the rate at which it is used.

A resource that exists in finite amounts on our planet and cannot be replenished

What energy source production method produces the most air pollution?

What charge does an electron have?

The gas in a container is heated but is kept at constant volume. Why does the gas pressure increase?