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homework 09 – NOORANI, ZOHEB
1
Latest unpenalized work: Feb 6 2008 Wednes
day 04:00 (after this date you can not make a
perfect score). Work cuto±: Feb 7 2008, 4:00
am.
Question 1, chap 4, sect 5.
part 1 of 1
10 points
A ball on the end of a string is whirled
around in a horizontal circle of radius 0
.
382 m.
The plane of the circle is 1
.
89 m above the
ground. The string breaks and the ball lands
2
.
78 m away from the point on the ground
directly beneath the ball’s location when the
string breaks.
The acceleration of gravity is 9
.
8 m
/
s
2
.
Find the centripetal acceleration of the ball
during its circular motion.
Answer in units of m
/
s
2
.
Question 2, chap 4, sect 5.
part 1 of 2
10 points
If the rotation of a planet of radius 5
.
89
×
10
6
m and freefall acceleration 6
.
39 m
/
s
2
increased to the point that the centripetal
acceleration was equal to the gravitational
acceleration at the equator, what would be
the tangential speed of a person standing at
the equator?
Answer in units of m
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 Spring '08
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