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Lesson 9 Homework
1.
What is the arc length subtended by an angle of
π
/4 rad on a circle of
radius 50 cm?
2.
What is the degree measure of an angle
π
/9?
3.
What is the radian measure of an angle 130
o
?
4.
A satellite in a circular orbit has a period of 10 hours. What is its
frequency in revolutions per day?
5.
The blades of a helicopter rotor describe an angle of 14
π
rad each
second. (i) What is the angular speed of the rotor in rpm? (ii) If the
length of a blade is 2.3 m, what is the linear speed of the tip of a
blade?
6.
A 0.5kg stone tied to a 1.2 m string is whirled in a horizontal circle
so that the radius of the circle is the same as the length of the string.
(a)
Express the speed of the stone in terms of the radius (r) of the
circle and the frequency (f)
of revolution.
(b)
Express the centripetal acceleration in terms of r and f
(c)
What is the minimum frequency of revolution for the
centripetal acceleration be the same as the acceleration of free
fall g?
7.
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This note was uploaded on 05/01/2011 for the course PHY 2048 taught by Professor George during the Fall '10 term at Edison State College.
 Fall '10
 George
 Physics, Work

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