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Class PH1110A2007
Assignment 6
Due at 5:00pm on Monday, September 10, 2007
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Exercise 4.26
An athlete throws a ball of mass
directly upward, and it feels no appreciable air resistance.
Part A
Draw a free-body diagram of this ball while it is free of the athlete's hand and moving upward;
Draw the force vectors with their tails at the dot. The orientation of your vectors will be
graded. The exact length of your vectors will not be graded but the relative length of one to the
other will be graded.
ANSWER:
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Part B
Draw a free-body diagram of this ball while it is free of the athlete's hand and at its highest point;
Draw the force vectors with their tails at the dot. The orientation of your vectors will be
graded. The exact length of your vectors will not be graded but the relative length of one to the
other will be graded.
ANSWER:
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Part C
Draw a free-body diagram of this ball while it is free of the athlete's hand and moving downward.
Draw the force vectors with their tails at the dot. The orientation of your vectors will be
graded. The exact length of your vectors will not be graded but the relative length of one to the
other will be graded.
ANSWER:
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Part D

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Repeat part A if the athlete throws the ball at a 60
angle above the horizontal instead of directly upward.
Draw the force vectors with their tails at the dot. The orientation of your vectors will be
graded. The exact length of your vectors will not be graded but the relative length of one to the
other will be graded.
ANSWER:
View
Part E
Repeat part B if the athlete throws the ball at a 60
angle above the horizontal instead of directly upward.
Draw the force vectors with their tails at the dot. The orientation of your vectors will be
graded. The exact length of your vectors will not be graded but the relative length of one to the
other will be graded.
ANSWER:
View
Part F
Repeat part C if the athlete throws the ball at a 60
angle above the horizontal instead of directly upward.
Draw the force vectors with their tails at the dot. The orientation of your vectors will be
graded. The exact length of your vectors will not be graded but the relative length of one to the
other will be graded.
ANSWER:
View
Exercise 4.24
The upward normal force exerted by the floor is 620
on an elevator passenger who weighs 650
.
Part A
What is the magnitude of the acceleration?
ANSWER:
=
0.452
Part B
What is the direction of the acceleration?

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ANSWER:
upward
downward
Pushing a Chair along the Floor
A chair of weight 115
lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of
= 41.0
directed at an angle of 39.0
below the horizontal and the chair slides along the floor.
Part A

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