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.) Why is it that a person can lie still on a "bed" of nails (Figure 4.53) without suffering any serious injuries but would incur severe puncture wounds to his feet if he tried to stand barefoot on the same "bed"?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 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.) 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.) . 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.) . A mass m is attached to a spring with spring constant k, as shown in Figure 2.53. The mass is pulled to the right a distance of 0.2 m and released. Rank the following spring-mass combinations according to their oscillation periods from shortest to longest. If any combinations have the same period, give them the same rank. You should assume that there is no friction between the mass and the horizontal surface. (a) k = 0.5 N/m: m 0.25 kg (b) k = 0.5 N/m: m 0.50 kg (c) k = 0.5 N/m; m 1.00 kg (d) k = 1.0 N/m: m 0.25 kg (e) k = 1.0 N/m: m 0.50 kgarrow_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.) 27. How are the physical concepts power and speed similar?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.) . In The Unparalleled Adventure of One Hans Pfaall" by Edgar Allen Poe, the hero discovers a gas whose density is '37.4 limes" less than that of hydrogen. How much better at lifting would a balloon filled with the new gas be compared to one filled with hydrogen?arrow_forward
- a shot putter hrows a 6kg shot with a final velocity of 7m/s. What is the kinectic energy of the shot?arrow_forwardhow much work is required to lift a 3.00kg object from a well 10.0 m deep?arrow_forwardWhat is the Kenetic Energy of a 1,500 kg car with a velocity of 72.0 km/h? How much work must be done on this car to bring it to a complete stop?arrow_forward