College Physics: A Strategic Approach (3rd Edition)
3rd Edition
ISBN: 9780321879721
Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher: PEARSON
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Textbook Question
Chapter 10, Problem 88MSPP
Work and Power in Cycling
When you ride a bicycle at constant speed, almost all of the energy you expend goes into the work you do against the drag force of the air. In this problem, assume that all of the energy expended goes into working against drag. As we saw in Section 5.7, the drag force on an object is approximately proportional to the square of its speed with respect to the air. For this problem, assume that F α v2 exactly and that the air is motionless with respect to the ground unless noted otherwise. Suppose a cyclist and her bicycle have a combined mass of 60 kg and she is cycling along at a speed of 5 m/s.
88. If she doubles her speed to 10 m/s, how much energy does she use in cycling 1 km?
A. 20 kJ
B. 40 kJ
C. 200 kJ
D. 400 kJ
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Useful equations
For Constant Velocity:
V =>
D
X = V₁t + Xo
For Constant Acceleration:
Vr = V + at
X = Xo+Vot +
v=V+2a(X-Xo)
\prom = V +V
V velocity
t = time
D Distance
X = Final Position
Xo Initial Position
V = Final Velocity
Vo Initial Velocity
a = acceleration
For free fall
Yf
= Final Position
Yo Initial Position
g = 9.80
m
$2
For free fall:
V = V + gt
Y=Yo+Vo t +
+gt
V,² = V₁²+2g (Y-Yo)
V+Vo
Vprom=
2
6
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upward velocity of 5 m/s. Find its displacement for t> 0.
y(t)
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Chapter 10 Solutions
College Physics: A Strategic Approach (3rd Edition)
Ch. 10 - The brake shoes of your car are made of a material...Ch. 10 - When you pound a nail with a hammer, the nail gets...Ch. 10 - For Questions 3 through 1 0, give a specific...Ch. 10 - For Questions 3 through 1 0, give a specific...Ch. 10 - For Questions 3 through 10, give a specific...Ch. 10 - For Questions 3 through 10, give a specific...Ch. 10 - For Questions 3 through 1 0, give a specific...Ch. 10 - For Questions 3 through 1 0, give a specific...Ch. 10 - For Questions 3 through 1 0, give a specific...Ch. 10 - For Questions 3 through 1 0, give a specific...
Ch. 10 - A ball of putty is dropped from a height of 2 m...Ch. 10 - A 0.5 kg mass on a 1-m-long string swings in a...Ch. 10 - Particle A has less mass than particle B. Both are...Ch. 10 - Puck B has twice the mass of puck A. Starting from...Ch. 10 - To change a tire, you need to use a jack to raise...Ch. 10 - Prob. 16CQCh. 10 - A roller coaster car rolls down a frictionless...Ch. 10 - A spring gun shoots out a plastic ball at speed v....Ch. 10 - Sandy and Chris stand on the edge of a cliff and...Ch. 10 - A solid cylinder and a hollow cylinder have the...Ch. 10 - You are much more likely to be injured if you fall...Ch. 10 - A roller coaster starts from rest at its highest...Ch. 10 - You and a friend each carry a 15 kg suitcase up...Ch. 10 - A woman uses a pulley and a rope to raise a 20 kg...Ch. 10 - A hockey puck sliding along frictionless ice with...Ch. 10 - A block slides down a smooth ramp, starting from...Ch. 10 - A wrecking ball is suspended from a 5.0-m-long...Ch. 10 - Prob. 1PCh. 10 - The two ropes seen in Figure P10.2 are used to...Ch. 10 - The two ropes shown in the bird's-eye view of...Ch. 10 - Prob. 4PCh. 10 - A boy flies a kite with the string at a 30 angle...Ch. 10 - A crate slides down a ramp that makes a 20 angle...Ch. 10 - Which has the larger kinetic energy, a 10 g bullet...Ch. 10 - At what speed does a 1000 kg compact car have the...Ch. 10 - Prob. 9PCh. 10 - The cheetah is the fastest land animal, reaching...Ch. 10 - How fast would an 80 kg man need to run in order...Ch. 10 - Sams job at the amusement park is to slow down and...Ch. 10 - A 20 g plastic ball is moving to the left at 30...Ch. 10 - Prob. 14PCh. 10 - An energy storage system based on a flywheel (a...Ch. 10 - The lowest point in death Valley is 85.0 m below...Ch. 10 - Prob. 17PCh. 10 - The world's fastest humans can reach speeds of...Ch. 10 - A 72 kg bike racer climbs a 1200-m-long section of...Ch. 10 - A 1000 kg wrecking ball hangs from a 15-m-long...Ch. 10 - How far must you stretch a spring with k = 1000...Ch. 10 - How much energy can be stored in a spring with a...Ch. 10 - The elastic energy stored in your tendons can...Ch. 10 - Marissa drags a 23 kg duffel bag 14 m across the...Ch. 10 - Mark pushes his broken car 150 m down the block to...Ch. 10 - A 900 N crate slides 12m down a ramp that makes an...Ch. 10 - A 25 kg child slides down a playground slide at a...Ch. 10 - A boy reaches out of a window and tosses a ball...Ch. 10 - Prob. 29PCh. 10 - What minimum speed does a 100 g puck need to make...Ch. 10 - A car is parked at the top of a 50-m-high hill....Ch. 10 - A 1500 kg car is approaching the hill shown in...Ch. 10 - A 10 kg runaway grocery cart runs into a spring,...Ch. 10 - As a 15,000 kg jet lands on an aircraft carrier,...Ch. 10 - Your friend's Frisbee has become stuck 16m above...Ch. 10 - A fireman of mass 80 kg slides down a pole. When...Ch. 10 - Prob. 37PCh. 10 - Prob. 38PCh. 10 - In the winter activity of tubing, riders slide...Ch. 10 - A cyclist is coasting at 12 m/s when she starts...Ch. 10 - A 50 g marble moving at 2.0 m/s strikes a 20 g...Ch. 10 - Ball 1, with a mass of 100 g and traveling at 10...Ch. 10 - Prob. 43PCh. 10 - Two balls undergo a perfectly elastic head-on...Ch. 10 - Prob. 45PCh. 10 - Prob. 46PCh. 10 - A 1000 kg sports car accelerates from 0 to 30m/sin...Ch. 10 - In just 0.30 s, you compress a spring (spring...Ch. 10 - An elite Tour de France cyclist can maintain an...Ch. 10 - A 710 kg car drives at a constant speed of 23 m/s....Ch. 10 - An elevator weighing 2500 N ascends at a constant...Ch. 10 - How much work does Scott do to push a 80 kg sofa...Ch. 10 - A 550 kg elevator accelerates upward at 1.2 m/s2...Ch. 10 - Prob. 54GPCh. 10 - Prob. 55GPCh. 10 - Prob. 56GPCh. 10 - You are driving your 1500 kg car at 20 m/s down a...Ch. 10 - A 20 kg child is on a swing that hangs from...Ch. 10 - Prob. 59GPCh. 10 - A cannon tilted up at a 30 angle fires a cannon...Ch. 10 - The sledder shown in Figure P10.61 starts from the...Ch. 10 - A 50 g ice cube can slide without friction up and...Ch. 10 - The maximum energy a bone can absorb without...Ch. 10 - In an amusement park water slide, people slide...Ch. 10 - Boxes A and B in Figure P10.69 have masses of 12.0...Ch. 10 - What would be the speed of the boxes in Problem 69...Ch. 10 - A 20 g ball is fired horizontally with initial...Ch. 10 - Two coupled boxcars are rolling along at 2.5 m/s...Ch. 10 - A fish scale, consisting of a spring with spring...Ch. 10 - A 70 kg human sprinter can accelerate from rest to...Ch. 10 - A 50 g ball of clay traveling at 6.5 m/s hits and...Ch. 10 - Prob. 78GPCh. 10 - The mass of an elevator and its occupants is 1200...Ch. 10 - Prob. 80GPCh. 10 - Tennis Ball Testing A tennis ball bouncing on a...Ch. 10 - Tennis Ball Testing A tennis ball bouncing on a...Ch. 10 - Tennis Ball Testing A tennis ball bouncing on a...Ch. 10 - Prob. 84MSPPCh. 10 - Tennis Ball Testing A tennis ball bouncing on a...Ch. 10 - Work and Power in Cycling When you ride a bicycle...Ch. 10 - Work and Power in Cycling When you ride a bicycle...Ch. 10 - Work and Power in Cycling When you ride a bicycle...Ch. 10 - Work and Power in Cycling When you ride a bicycle...Ch. 10 - Work and Power in Cycling When you ride a bicycle...
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