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FOR SCIENTISTS AND ENGINEERS
physics
a strategic approachTHIRD EDITION
randall d. knight
© 2013 Pearson Education, Inc.
Chapter 11 QuickCheck Questions
© 2013 Pearson Education, Inc.
A skier is gliding down a slope at a constant speed.
What energy transformation is taking place?
A. K Ug
B. Ug K
C. Eth K
D. Ug Eth
E. K Eth
QuickCheck 11.1
Slide 11-23
© 2013 Pearson Education, Inc.
A tow rope pulls a skier up the slope at constant speed.
What energy transfer (or transfers) is taking place?
A. W Ug
B. W K
C. W Eth
D. Both A and B.
E. Both A and C.
QuickCheck 11.2
Slide 11-29
© 2013 Pearson Education, Inc.
A crane lowers a girder into place at constant speed.
Consider the work Wg done by gravity and the work
WT done by the tension in the cable. Which is true?
A. Wg > 0 and WT > 0
B. Wg > 0 and WT < 0
C. Wg < 0 and WT > 0
D. Wg < 0 and WT < 0
E. Wg = 0 and WT = 0
QuickCheck 11.3
Slide 11-34
© 2013 Pearson Education, Inc.
Robert pushes the box to the
left at constant speed. In doing
so, Robert does ______ work
on the box.
A. positive
B. negative
C. zero
QuickCheck 11.4
Slide 11-39
© 2013 Pearson Education, Inc.
QuickCheck 11.5
A constant force pushes a particle through a
displacement . In which of these three cases does
the force do negative work?
D. Both A and B.
E. Both A and C.
Slide 11-41
© 2013 Pearson Education, Inc.
Which force below does the most work? All three
displacements are the same.
A. The 10 N force.
B. The 8 N force
C. The 6 N force.
D. They all do the same work.
QuickCheck 11.6
sin60 = 0.87
cos60 = 0.50
Slide 11-47
© 2013 Pearson Education, Inc.
A light plastic cart and a heavy
steel cart are both pushed with
the same force for a distance
of 1.0 m, starting from rest.
After the force is removed, the
kinetic energy of the light
plastic cart is ________ that of
the heavy steel cart.
QuickCheck 11.7
A. greater than
B. equal to
C. less than
D. Can’t say. It depends on how big the force is.
Slide 11-49
© 2013 Pearson Education, Inc.
A car on a level road turns a
quarter circle ccw. You learned
in Chapter 8 that static friction
causes the centripetal
acceleration. The work done
by static friction is _____.
A. positive
B. negative
C. zero
QuickCheck 11.8
Slide 11-52
© 2013 Pearson Education, Inc.
A particle moves along the
x-axis with the potential
energy shown. At x = 4 m,
the x-component of the
force on the particle is
A. –4 N.
B. –2 N.
C. 0 N.
D. 2 N.
E. 4 N
QuickCheck 11.9
Slide 11-77
© 2013 Pearson Education, Inc.
How much work is done
by the environment in the
process represented by
the energy bar chart?
A. –2 J
B. –1 J
C. 0 J
D. 1 J
E. 2 J
QuickCheck 11.10
Slide 11-88
© 2013 Pearson Education, Inc.
Four students run up the stairs in the time shown.
Which student has the largest power output?
QuickCheck 11.11
Slide 11-103