Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 4, Problem 48Q
To determine
To describe:
The way in which the energy of the sunlight ends up in a kangaroo jumping through the air.
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Chapter 4 Solutions
Universe: Stars And Galaxies
Ch. 4 - Prob. 1QCh. 4 - Prob. 2QCh. 4 - Prob. 3QCh. 4 - Prob. 4QCh. 4 - Prob. 5QCh. 4 - Prob. 6QCh. 4 - Prob. 7QCh. 4 - Prob. 8QCh. 4 - Prob. 9QCh. 4 - Prob. 10Q
Ch. 4 - Prob. 11QCh. 4 - Prob. 12QCh. 4 - Prob. 13QCh. 4 - Prob. 14QCh. 4 - Prob. 15QCh. 4 - Prob. 16QCh. 4 - Prob. 17QCh. 4 - Prob. 18QCh. 4 - Prob. 19QCh. 4 - Prob. 20QCh. 4 - Prob. 21QCh. 4 - Prob. 22QCh. 4 - Prob. 23QCh. 4 - Prob. 24QCh. 4 - Prob. 25QCh. 4 - Prob. 26QCh. 4 - Prob. 27QCh. 4 - Prob. 28QCh. 4 - Prob. 29QCh. 4 - Prob. 30QCh. 4 - Prob. 31QCh. 4 - Prob. 32QCh. 4 - Prob. 33QCh. 4 - Prob. 34QCh. 4 - Prob. 35QCh. 4 - Prob. 36QCh. 4 - Prob. 37QCh. 4 - Prob. 38QCh. 4 - Prob. 39QCh. 4 - Prob. 40QCh. 4 - Prob. 41QCh. 4 - Prob. 42QCh. 4 - Prob. 43QCh. 4 - Prob. 44QCh. 4 - Prob. 45QCh. 4 - Prob. 46QCh. 4 - Prob. 47QCh. 4 - Prob. 48QCh. 4 - Prob. 49QCh. 4 - Prob. 50QCh. 4 - Prob. 51QCh. 4 - Prob. 52QCh. 4 - Prob. 53QCh. 4 - Prob. 54QCh. 4 - Prob. 55QCh. 4 - Prob. 56QCh. 4 - Prob. 57QCh. 4 - Prob. 58Q
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- Every so often, someone claims to have built a machine that can generate energy perpetually from nothing. Why isn't this possible according to the known laws of nature? Why do you think claims of perpetual motion machines sometimes receive substantial media attention?arrow_forwardIs perpetual motion a possibility? In your answer, come up with an example either that has already been created or one that you have thought of to support your answer. You must explain why your example is or is not an example of perpetual motion.arrow_forwardMike must work at least 18 hours a week to supplement his income while attending school. He has the opportunity to work in two retail stores. In store 1, he can work between 5 and 13 hours a week, and in store 2, he is allowed between 6 and 11 hours. Both stores pay the same hourly wage. In deciding how many hours to work in each store, Mike wants to base his decision on work stress. Based on interviews with present employees, Mike estimates that, on an ascending scale of 1 to 10, the stress factors are 8 and 6 at stores 1 and 2, respectively. Because stress mounts by the hour, he assumes that the total stress for each store at the end of the week is proportional to the number of hours he works in the store. How many hours should Mike work in each store?arrow_forward
- Suppose that you want to build a tower out of bricks. Suppose that each brick has a mass of 0.5 kg and is 0.1 m tall. You want the tower to be 20 bricks high, and we want to calculate how much energy is required to build it. The physics fact that you need is this: the energy, E (in Joules) required to lift a mass m (in kg) a height h (in m) is E = mgh (where g is the acceleration due to gravity - for this problem, you can take g to be 10 m/s2.) 1. We will assume that no energy is required to place the first brick in the tower, since it is already on the ground. What about the second brick? How high must if be lifted to be placed on top of the first brick? How much energy does that require? What about the third brick? The tenth brick?arrow_forwardRead the text about an object in motion. Helen was about to play the first hole on a mini golf course. She placed her golf ball on the mat in front of her and aimed carefully with her golf club. Then, Helen gently tapped the ball straight toward the hole. The ball rolled slowly along the flat mat before falling to the bottom of the hole. When was the least gravitational potential energy stored between the golf ball and Earth? Assume that the golf ball's mass did not change. when the ball was farthest from the hole when the ball was rolling slowly on the mat when the ball was at the bottom of the holearrow_forwardJack who has a mass of 30 kg and weighs 300 N, sits in a child's swing. You pull the swing back so that it is 2 m above its low point, and release it. What form of energy, and how much energy, does Jack have when he is pulled back and held at rest?arrow_forward
- Which of the 8 standard physical forms of energy can be present in our own bodies? (choose as many as may exist) (a) thermal. (b) electromagnetic (c) radiant. (d) chemical. (c) kinetic. (f) elastic (g) nuclear (h) gravitationalarrow_forwardA cyclist pedals for 20 min at a speed of 15 km/h. How much metabolic energy is required? How much energy is used for forward propulsion?arrow_forwardQuestion: We say that ENERGY is a central concept in science but how can you relate this topic in your everyday life? Direction: -Answer the question in two to three sentences only.arrow_forward
- What is geothermal energy and hydrogen energy, and what are their advantages and disadvantages in our lives and nature?arrow_forwardWhy do we say energy cannot be created or destroyed? Isn't energy created in a light bulb?arrow_forwardThe Sun puts out twice as much solar energy in 2 hours as it does in 1 hour. But the solar power of the Sun is the same from one hour to the next. Distinguish between the terms solar energysolar power.arrow_forward
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