Download Physics 3U Energy and Soc Review

Physics 3U
Energy and Society Review
1. You are asked to determine the mass defect in a nuclear reaction. What
information do you need?
2. A student is dragging a bag of garbage along the ground. You are given the
mass of the bag, the magnitude of the force the student is exerting on the bag,
and the magnitude of the displacement of the bag. Calculate the work done by
the student on the bag. What information is needed to answer the question?
What information is unnecessary?
3. Einstein’s work with relativity showed that energy is effectively about mass. On a
normal human scale, what is energy about?
4. A ball is thrown upwards. Given the mass of the ball and its initial height above
the ground, calculate the ball’s kinetic energy. What information is needed to
answer the question? What information is surplus?
5. A car is lifted a specified distance into the air at a given constant speed by a
mechanical hoist. Determine the gain in gravitational potential energy. What
information is missing? What information is unnecessary?
6. A ball is lifted a given distance above the ground and then dropped. Calculate
the speed of the ball just before it hits the ground. What additional information is
needed to answer the question?
7. You are given the brightness and efficiency of a fluorescent lamp and asked to
calculate its energy output. What information do you need to answer the
question? What information is surplus?
8. You are given the mass and speed of a car and asked to calculate its power
output. What information do you need to answer the question? What information
is not needed?
9. You are given the power output and efficiency of a toaster. Calculate the energy
output of the toaster. What information do you need to answer the question?
What information is unnecessary?
10. Give one example each of conduction of heat, convection of heat, and radiation
of heat found in a home.
11. You are given the specific heat capacity of a piece of metal as well as the initial
and final temperatures of the metal. Calculate the heat gained/lost by the metal.
What information is needed to answer the question? What information is
surplus?
12. You are asked to determine what mass of ice will be melted by a given amount of
heat. The heat is generated at a given rate of power. What information do you
need to answer the question? What information is unnecessary?
13. What is an alpha particle composed of?
14. Given the half-life, the decay type, and initial mass of a radioactive isotope;
determine the final mass of the isotope. What information do you need to answer
the question? What information is unnecessary?
15. A nuclear power plant generates a given power output. What mass defect is
required to operate the reactor for a day? What information is needed to answer
this question? What information is surplus?
16. Specify the energy transformations that occur in a hydro-electric generating
plant.
Physics 3U
Energy and Society Review
Answers:
1. energy of the reaction
2. needed: angle between force and displacement, surplus:
mass of bag 3. motion or potential motion
4. needed: initial velocity, surplus:
initial height 5. needed: mass of car, surplus: speed of hoist
6. needed: nothing
7. needed: energy input, surplus: brightness 8. needed: force exerted, surplus: mass
9. needed: time of energy output, surplus: efficiency
10. answers vary, see wiki
page from Nov 7 for examples
11. needed: mass of metal, surplus: nothing
12. needed: latent heat of fusion of ice, surplus, power of heat generation 13. two
protons, two neutrons (helium nucleus)
14. needed: time of decay, surplus: decay
type 15. needed: efficiency of reactor process, surplus: nothing. 16. gravitational
potential of water to kinetic energy of water to kinetic energy of turbine to electrical
energy
Possible Review questions for the Energy and Society test
p. 176 – 177 #1, 3, 5, 8 – 14, 18 – 22
p. 224 – 225 #1 – 5, 7 – 10, 13, 20, 21, 26 - 28