CONCEPTUAL PHYSICS LL FD
12th Edition
ISBN: 9780135745816
Author: Hewitt
Publisher: PEARSON
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Chapter 18, Problem 33RCQ
Show that the ideal efficiency is 90% for an engine in which fuel is heated to 3000K and the surrounding air is 300K.
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Part C
Find the height yi
from which the rock was launched.
Express your answer in meters to three significant figures.
Learning Goal:
To practice Problem-Solving Strategy 4.1 for projectile motion problems.
A rock thrown with speed 12.0 m/s and launch angle 30.0 ∘ (above the horizontal) travels a horizontal distance of d = 19.0 m before hitting the ground. From what height was the rock thrown? Use the value g = 9.800 m/s2 for the free-fall acceleration.
PROBLEM-SOLVING STRATEGY 4.1 Projectile motion problems
MODEL: Is it reasonable to ignore air resistance? If so, use the projectile motion model.
VISUALIZE: Establish a coordinate system with the x-axis horizontal and the y-axis vertical. Define symbols and identify what the problem is trying to find. For a launch at angle θ, the initial velocity components are vix=v0cosθ and viy=v0sinθ.
SOLVE: The acceleration is known: ax=0 and ay=−g. Thus, the problem becomes one of…
Phys 25
Chapter 18 Solutions
CONCEPTUAL PHYSICS LL FD
Ch. 18 - Prob. 1RCQCh. 18 - Prob. 2RCQCh. 18 - Prob. 3RCQCh. 18 - Prob. 4RCQCh. 18 - Prob. 5RCQCh. 18 - Prob. 6RCQCh. 18 - Prob. 7RCQCh. 18 - Prob. 8RCQCh. 18 - Prob. 9RCQCh. 18 - Prob. 10RCQ
Ch. 18 - Prob. 11RCQCh. 18 - Prob. 12RCQCh. 18 - Prob. 13RCQCh. 18 - Prob. 14RCQCh. 18 - Prob. 15RCQCh. 18 - Prob. 16RCQCh. 18 - Prob. 17RCQCh. 18 - Prob. 18RCQCh. 18 - Prob. 19RCQCh. 18 - Prob. 20RCQCh. 18 - Prob. 21RCQCh. 18 - Prob. 22RCQCh. 18 - Prob. 23RCQCh. 18 - Prob. 24RCQCh. 18 - Prob. 25RCQCh. 18 - Prob. 26RCQCh. 18 - Prob. 27RCQCh. 18 - Prob. 28RCQCh. 18 - Prob. 29RCQCh. 18 - What is the zeroth law of thermodynamics?Ch. 18 - Prob. 31RCQCh. 18 - Prob. 32RCQCh. 18 - Show that the ideal efficiency is 90% for an...Ch. 18 - 34. Calculate the ideal efficiency of an engine in...Ch. 18 - 35. What is the ideal efficiency of an automobile...Ch. 18 - Prob. 36RCQCh. 18 - 37. On a chilly 100C day, your friend who loves...Ch. 18 - 38. Imagine a giant dry-cleaner’s bag full of air...Ch. 18 - Wally Whacko claims to have invented a heat engine...Ch. 18 - 40. A power station with an efficiency of 0.4...Ch. 18 - 41. Consider a 6.0g steel nail 8.0cm long and a...Ch. 18 - Prob. 42RCQCh. 18 - Prob. 43RCQCh. 18 - Prob. 44RCQCh. 18 - Prob. 45RCQCh. 18 - Prob. 46RCQCh. 18 - 47. If you vigorously shake a can of chicken broth...Ch. 18 - Prob. 48RCQCh. 18 - 49. Suppose you do 100J of work in compressing a...Ch. 18 - Why does the bottom of a tire pump feel hot when...Ch. 18 - Prob. 51RCQCh. 18 - Prob. 52RCQCh. 18 - Prob. 53RCQCh. 18 - What is the ultimate source of energy in coal,...Ch. 18 - Prob. 55RCQCh. 18 - Prob. 56RCQCh. 18 - Prob. 57RCQCh. 18 - 58. What happens to the efficiency of a heat...Ch. 18 - Prob. 59RCQCh. 18 - Prob. 60RCQCh. 18 - Prob. 61RCQCh. 18 - Prob. 62RCQCh. 18 - Prob. 63RCQCh. 18 - Prob. 64RCQCh. 18 - 65. A refrigerator moves heat from cold to warm....Ch. 18 - 66. What happens to the density of a quantity of...Ch. 18 - Prob. 67RCQCh. 18 - In buildings that are being electrically heated,...Ch. 18 - Prob. 69RCQCh. 18 - Prob. 70RCQCh. 18 - Prob. 71RCQCh. 18 - Prob. 72RCQCh. 18 - Prob. 73RCQCh. 18 - The ocean possesses enormous numbers of molecules,...Ch. 18 - Prob. 75RCQCh. 18 - Prob. 76RCQCh. 18 - Prob. 77RCQCh. 18 - Prob. 78RCQCh. 18 - Prob. 79RCQCh. 18 - Prob. 80RCQCh. 18 - Prob. 81RCQCh. 18 - Prob. 82RCQCh. 18 - Prob. 83RCQCh. 18 - Prob. 84RCQCh. 18 - 85. The temperature in Boston was 400F when it was...Ch. 18 - Prob. 86RCQCh. 18 - Prob. 87RCQCh. 18 - Prob. 88RCQCh. 18 - Prob. 89RCQCh. 18 - Prob. 90RCQCh. 18 - Prob. 91RCQCh. 18 - Prob. 92RCQCh. 18 - Prob. 93RCQ
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