Concept explainers
(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without tins designation typically require integrating or extending the concepts presented thus far.)
18. Identify the energy conversions taking place in each of the following situations. Name all of the relevant forms of energy that are involved.
(a) A camper nibbling two sticks together to start a fire.
(b) An arrow shot straight upward; from the moment the bowstring is released by the archer to the moment when the arrow reaches its highest point.
(c) A nail being pounded into a board, from the moment a carpenter starts to swing a hammer to the moment when the nail has been driven some distance into the wood by the blow.
(d) A meteoroid entering Earth's atmosphere,
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Chapter 3 Solutions
Inquiry into Physics
- (Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) 15. How can the gravitational potential energy of something be negative?arrow_forward(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) 13. When you throw a ball, the work you do to accelerate it equals the kinetic energy the ball gains. If you do twice as much work when throwing the ball, does it go twice as fast? Explain.arrow_forward(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) If we know that a force of 5 N acts on an object while it moves 2 meters, can we calculate how much work was done with no other information? Explain.arrow_forward
- (Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without tins designation typically require integrating or extending the concepts presented thus far.) . A ball is thrown straight upward from the surface of the Moon. Is the maximum height it reaches less than, equal to, or greater than the maximum height reached by" a ball thrown upward on Earth with the same initial speed? (Ignore air resistance in both cases.) Explain.arrow_forward(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) 9. When climbing a flight of stairs, do you do work on the stairs? Do the stairs do work on you?arrow_forward(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) 29. A person runs up several flights of stairs and is exhausted at the top. Later, the same person walks up the same stairs and does not feel as tired. Why is this? Ignoring air resistance, does it take more work or energy to run up the stairs than to walk up?arrow_forward
- (¦ Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) . A potato will cook faster in a conventional oven if a large nail is inserted into it. Why?arrow_forward(Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.) 11. Identify as many different ways as you can for giving energy to a basketball.arrow_forwardFrom the word energy, give at least 5 words/ideas/concepts that you can think of?arrow_forward
- A new coal-burning power plant can generate 1:5 gigawatts (billion watts) of power. Burning 1 kilogram of coal yields about 449 kilowatt-hours of energy. Complete parts (a), (b), and (c) below. a. How much energy, in kilowatt-hours, can the plant generate each month? million kilowatt-hours of energy each month. The plant can generate (Type an integer.)arrow_forwardSending 4 home work questions. See attached 1.An electric motor has a power output of 1.5 kw. If it operates at 75% efficiency, what work can it do in an hour in Joules? How much work can it do in a year in Kilo watt hours kwh?arrow_forwardAn exercise machine indicates that you have worked off2.1 Calories in a minute-and-a-half of running in place. What wasyour power output during this time? Give your answer in bothwatts and horsepowerarrow_forward