MasteringPhysics: Assignment Print View
http://session.masteringphysics.com/myct/assignmentPrint?assignm.
..
1 of 15
10/21/07 4:29 PM
[
Print View
]
physics 2211
MP10:Chapter 10
Due at 5:30pm on Monday, October 22, 2007
View Grading
Details
Pucks on Ice
Two hockey players, Aaron and Brunnhilde, are pushing two pucks on a frictionless ice rink. The pucks are initially at
rest on the starting line. Brunnhilde is pushing puck B, which has a mass three times as great as that of puck A,
which Aaron is pushing. The players exert equal constant forces of
magnitude
on their pucks, directed horizontally, towards the
finish line. They start pushing at the same time, and each player
pushes his or her puck until it crosses the finish line, a distance
away.
Part A
Which puck reaches the finish line first?
Part A.1 Compute the relative acceleration of the pucks
Part not displayed
ANSWER:
Both pucks reach the finish line at the same time.
Puck A reaches the finish line first.
Puck B reaches the finish line first.
More information is needed to answer this question.
Part B
Let
be the magnitude of the kinetic energy of puck A at the instant it reaches the finish line. Similarly,
is
the magnitude of the kinetic energy of puck B at the (possibly different) instant it reaches the finish line. Which of
the following statements is true?
Part B.1 Determine the simplest way to answer this question
Part not displayed
Part B.2 Work done on puck A
[
Print
]
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentMasteringPhysics: Assignment Print View
http://session.masteringphysics.com/myct/assignmentPrint?assignm.
..
2 of 15
10/21/07 4:29 PM
Part B.3 Work done on puck B
Part not displayed
ANSWER:
You need more information to decide.
Part C
Let
be the magnitude of the momentum of puck A at the instant it reaches the finish line. Similarly,
is the
magnitude of the momentum of puck B at the (possibly different) instant it reaches the finish line. Which of the
following statements is true?
Part C.1 Method 1: Compute the ratio of the pucks' velocities
Part not displayed
Hint C.2 Method 2: Use the impulsemomentum theorem
Hint not displayed
Choose the best option.
ANSWER:
You need more information to decide.
PSS 10.1: College Bored
Learning Goal:
To practice ProblemSolving Strategy 10.1 for problems involving conservation of mechancial
energy.
A bored college student decides to try bungee jumping. He attaches an elastic bungee cord to his ankles and happily
jumps off a tall bridge across a river. He ends up barely touching the water before the cord jerks him back up. What is
the mass
of the student?
The length of the relaxed cord is
; the distance from the bridge to the river surface is
(where
), and the
spring constant of the elastic cord is
.
MODEL:
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '08
 DUNCAN
 Physics, Energy, Kinetic Energy, Momentum, Potential Energy, Assignment Print View

Click to edit the document details