Assignment MasteringPhysics: Print View
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11 - More problems for Newton's Laws.
Due: 8:00pm on Wednesday, February 29, 2012
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Hints to 5.8: What is the acceleration of the ball? Apply Newton's 2nd Law in horizontal and vertical directions.
Exercise 5.8
A large wrecking ball is held in place by two light steel cables .
Part A
If the mass
of the wrecking ball is 4190
ANSWER:
, what is the tension
in the cable that makes an angle of 39 with the vertical?
5.28104
Answer Requested
, what is the tension
in the horizontal cable?
Part B
If the mass
of the wrecking ball is 4190
ANSWER:
3.33104
Answer Requested
Hint to 5.90: In this problem the normal force on the box by the elevator is not equal to the weight of the box, since the box is accelerating.
Problem 5.90: Friction in an Elevator
You are riding in an elevator on the way to the eighteenth floor of your dormitory. The elevator's upward acceleration is
box containing your new computer; box and contents have a total mass of 28.3
= 1.88
. Beside you is While the
. the elevator is accelerating upward, you push horizontally on the
box to slide it at constant speed toward the elevator door.
Part A
If the coefficient of kinetic friction between the box and elevator floor is
= 0.35, what magnitude of force must you apply?
Express your answer using two significant figures.
ANSWER:
120
Answer Requested
Problem 5.41
Human body falling though air.
Part A
What value of D is required to make
Take the free fall acceleration to be
ANSWER:
= 42.4
= 9.80
the terminal velocity of a skydiver of mass 75.0
.
.
0.409
kg/m
Answer Requested
Part B
If the sky diver's daughter, whose mass is 42.0
Take the free fall acceleration to be
= 9.80
, is falling through the air and has
, what is the daughter's terminal speed?
.
ANSWER:
http://session.masteringphysics.com/myct/assignmentPrintView?assignmentID=1738194
4/16/2012
MasteringPhysics: Assignment Print View
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40.6
m/s
Answer Requested
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http://session.masteringphysics.com/myct/assignmentPrintView?assignmentID=1738194
4/16/2012