Physics of Everyday Phenomena
9th Edition
ISBN: 9781260048469
Author: Griffith
Publisher: MCG
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Chapter 11, Problem 19CQ
When a heat pump is used to heat a building, where does the heat come from? Explain.
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Consider the situation in the figure below; a neutral conducting ball hangs from the ceiling by an insulating string, and a charged insulating rod is going to be placed nearby.
A. First, if the rod was not there, what statement best describes the charge distribution of the ball?
1) Since it is a conductor, all the charges are on the outside of the ball. 2) The ball is neutral, so it has no positive or negative charges anywhere. 3) The positive and negative charges are separated from each other, but we don't know what direction the ball is polarized. 4) The positive and negative charges are evenly distributed everywhere in the ball.
B. Now, when the rod is moved close to the ball, what happens to the charges on the ball?
1) There is a separation of charges in the ball; the side closer to the rod becomes positively charged, and the opposite side becomes negatively charged. 2) Negative charge is drawn from the ground (via the string), so the ball acquires a net negative charge. 3)…
answer question 5-9
AMPS
VOLTS
OHMS
5) 50 A
110 V
6) .08 A
39 V
7) 0.5 A
60
8) 2.5 A
110 V
Chapter 11 Solutions
Physics of Everyday Phenomena
Ch. 11 - Prob. 1CQCh. 11 - Prob. 2CQCh. 11 - In applying the first law of thermodynamics to a...Ch. 11 - Is the total amount of heat released by a heat...Ch. 11 - From the perspective of the first law of...Ch. 11 - Which motor in a hybrid vehiclethe electric or...Ch. 11 - Prob. 7CQCh. 11 - Prob. 8CQCh. 11 - Prob. 9CQCh. 11 - Prob. 10CQ
Ch. 11 - Prob. 11CQCh. 11 - Is it possible for the efficiency of a heat engine...Ch. 11 - Can a Carnot engine operate in an irreversible...Ch. 11 - Does a gasoline-burning automobile engine operate...Ch. 11 - Which would have the greater efficiencya Carnot...Ch. 11 - If we want to increase the efficiency of a Carnot...Ch. 11 - Is a heat pump the same thing as a heat engine?...Ch. 11 - Is a heat pump essentially the same thing as a...Ch. 11 - When a heat pump is used to heat a building, where...Ch. 11 - Is it possible to cool a closed room by leaving...Ch. 11 - Prob. 21CQCh. 11 - Prob. 22CQCh. 11 - Prob. 23CQCh. 11 - Prob. 24CQCh. 11 - Which has the higher entropy, a deck of cards in...Ch. 11 - A hot cup of coffee is allowed to cool down, thus...Ch. 11 - When a substance freezes, the molecules become...Ch. 11 - Which would normally have the greater thermal...Ch. 11 - In what ways is a nuclear power plant similar to a...Ch. 11 - What is the distinction between high-grade heat...Ch. 11 - Prob. 31CQCh. 11 - Prob. 32CQCh. 11 - Is an automobile engine a perpetual-motion...Ch. 11 - Prob. 34CQCh. 11 - Prob. 35CQCh. 11 - The water draining from the bottom of the pond...Ch. 11 - Prob. 37CQCh. 11 - In one cycle, a heat engine takes in 1200 J of...Ch. 11 - A heat engine with an efficiency of 28% does 700 J...Ch. 11 - In one cycle, a heat engine takes in 800 J of heat...Ch. 11 - A heat engine with an efficiency of 35% takes in...Ch. 11 - In one cycle, a heat engine does 700 J of work and...Ch. 11 - A Carnot engine takes in heat at a temperature of...Ch. 11 - A Carnot engine takes in heat from a reservoir at...Ch. 11 - A Carnot engine operates between temperatures of...Ch. 11 - A heat pump takes in 450 J of heat from a...Ch. 11 - In each cycle of its operation, a refrigerator...Ch. 11 - A typical electric refrigerator (see fig. 11.9)...Ch. 11 - A typical nuclear power plant delivers heat from...Ch. 11 - An ocean thermal-energy power plant takes in warm...Ch. 11 - An engineer designs a heat engine using flat-plate...Ch. 11 - Suppose that a typical automobile engine operates...Ch. 11 - Prob. 2SPCh. 11 - A Carnot engine operating in reverse as a heat...Ch. 11 - In section 11.3, we showed that a violation of the...Ch. 11 - Suppose that an oil-fired power plant is designed...
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- The determined Wile E. Coyote is out once more to try to capture the elusive Road Runner of Loony Tunes fame. The coyote is strapped to a rocket, which provide a constant horizontal acceleration of 15.0 m/s2. The coyote starts off at rest 79.2 m from the edge of a cliff at the instant the roadrunner zips by in the direction of the cliff. If the roadrunner moves with constant speed, find the minimum velocity the roadrunner must have to reach the cliff before the coyote. (proper sig fig in answer)arrow_forwardPROBLEM 4 What is the resultant of the force system acting on the connection shown? 25 F₁ = 80 lbs IK 65° F2 = 60 lbsarrow_forwardThree point-like charges in the attached image are placed at the corners of an equilateral triangle as shown in the figure. Each side of the triangle has a length of 38.0 cm, and the point (C) is located half way between q1 and q3 along the side. Find the magnitude of the electric field at point (C). Let q1 = −2.80 µC, q2 = −3.40 µC, and q3 = −4.50 µC. Thank you.arrow_forward
- STRUCTURES I Homework #1: Force Systems Name: TA: PROBLEM 1 Determine the horizontal and vertical components of the force in the cable shown. PROBLEM 2 The horizontal component of force F is 30 lb. What is the magnitude of force F? 6 10 4 4 F = 600lbs F = ?arrow_forwardThe determined Wile E. Coyote is out once more to try to capture the elusive Road Runner of Loony Tunes fame. The coyote is strapped to a rocket, which provide a constant horizontal acceleration of 15.0 m/s2. The coyote starts off at rest 79.2 m from the edge of a cliff at the instant the roadrunner zips by in the direction of the cliff. If the roadrunner moves with constant speed, find the minimum velocity the roadrunner must have to reach the cliff before the coyote. (proper sig fig)arrow_forwardHello, I need some help with calculations for a lab, it is Kinematics: Finding Acceleration Due to Gravity. Equations: s=s0+v0t+1/2at2 and a=gsinθ. The hypotenuse,r, is 100cm (given) and a height, y, is 3.5 cm (given). How do I find the Angle θ1? And, for distance traveled, s, would all be 100cm? For my first observations I recorded four trials in seconds: 1 - 2.13s, 2 - 2.60s, 3 - 2.08s, & 4 - 1.95s. This would all go in the coloumn for time right? How do I solve for the experimental approximation of the acceleration? Help with trial 1 would be great so I can use that as a model for the other trials. Thanks!arrow_forward
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