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Chapter 7: Q2CP (page 289)
How many joules of energy can you store in a spring whose stiffness is, 0.6 N/m by starting from a relaxed spring and stretching it 20cm?
A spring having0.6 N/m stiffness and starting to stretch it from a relaxed position upto 20 cm can store0.012 J of energy.
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You lift a heavy box. We’ll consider this process for different choices of system and surroundings.
(a) Choose the box as the system of interest. What objects in the surroundings exert significant forces on this system?
(b) Choose you and the box as the system of interest. What objects in the surroundings exert significant forces on this system?
(c) Choose you, the box, and the Earth as the system of interest. What objects in the surroundings exert significant forces on this system?
During three hours one winter afternoon, when the outside temperature was , a house heated by electricity was kept at with the expenditure of(kilowatt hours) of electric energy. What was the average energy leakage in joules per second through the walls of the house to the environment (the outside air and ground)?
The rate at which energy is transferred between two systems is often proportional to their temperature difference. Assuming this to hold in this case, if the house temperature had been kept at, how manyof electricity would have been consumed?
You drop a single coffee filter of mass 1.7 g from a very tall building, and it takes 52 s to reach the ground. In a small fraction of that time the coffee filter reached terminal speed. (a) What was the upward force of the air resistance while the coffee filter was falling at terminal speed? (b) Next you drop a stack of five of these coffee filters. What was the upward force of the air resistance while this stack of coffee filters was falling at terminal speed? (c) Again assuming that the stack reaches terminal speed very quickly, about how long will the stack of coffee filters take to hit the ground?
If you let a mass at the end of a string start swinging, at first the maximum swing decreases rather quickly, but once the swing has become small it takes a long time for further significant decrease to occur. Try it! Explain this simple observation.
Throw a ball straight up and catch it on the way down, at the same height. Taking into account air resistance, does the ball take longer to go up or to come down? Why?
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