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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!
g.p.e
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!
1200 J
Complete the equation for the final pressure p2 of the gas when the gas is compressed at a constant temperature. p2 =
p2 = (p1 x V1)/V2
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.
4100 J
State the form of energy stored due to the stretching of the surface of the trampoline
Elastic Potential Energy
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.
864 J
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.
0.62 m/s
A car tyre has a constant volume. Why does the pressure of the air in the tyre increase when its temperature increases?
The average speed of the air molecules in the tyre is greater.
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?
pressure: decrease; KE: decrease
The gas in a container is heated but is kept at constant volume. Why does the gas pressure increase?
The molecules move more rapidly
Molecules escape from a liquid during evaporation. The temperature of the remaining liquid changes. Which molecules escape and how does the temperature change?
molecule escape: more energetic; temperature: decrease
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?
Pressure: increase, speed: increase
Small smoke particles suspended in air are viewed through a microscope. The smoke particles move randomly. What does this show?
The air consists of fast-moving molecules.
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?
The average kinetic energy of the molecules increases.
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?
mass: decrease, weight: decrease.
What energy transfer takes place when a matchstick burns?
Chemical to heat/light
What form of energy is used to generate electrical energy in a tidal power station?
Gravitational Potential Energy
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?
gravitational potential → kinetic → thermal (heat)
What source of energy involves the splitting of heavy atoms?
Nuclear
An electric generator converts _______________ energy into electrical energy
Kinetic / mechanical
What is the major drawback or risk of nuclear energy production?
It creates radioactive waste
What energy source production method produces the most air pollution?
Coal Energy
The amount of energy used by devices in your home in a month is measured in
kWh
What charge does an electron have?
Negative
A measurement of the amount of power an electrical current has.
Watt
A resource that exists in finite amounts on our planet and cannot be replenished
Non-Renewable source/energy
A material whose atoms transfer, or “share,” electrons easily with other atoms.
Conductor
The basic unit of matter.
Atom
A material whose atoms do not transfer, or “share,” electrons easily.
Insulator
A resource that can be replaced or replenished at a rate equal to or faster than the rate at which it is used.
Renewable resource
One of the particles found in an atom.
Electron or Proton or Neutron
An energy source formed from the decomposition of dead organisms.
Fossil Fuel
The ability to do work.
Energy
A device that moves a magnet near a wire to create a steady flow of electrons
Generator
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?
80000 J or 80 kJ
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?
Kinetic Energy
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?
Chemical Potential Energy
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