Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
4th Edition
ISBN: 9780134110684
Author: Randall D. Knight (Professor Emeritus)
Publisher: PEARSON
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Chapter 6, Problem 61EAP
Astronauts in space "weigh" themselves by oscillating on a spring. Suppose the position of an oscillating 75 kg astronaut is given by
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A mass m is suspended from a massless spring
of natural length 90 cm with the spring constant
= 10 Nm and causes the spring to extend
k
by 9.1 cm. Assuming the gravitational field
= 9.8 ms2, calculate the value of
strength g
the mass on the spring. Give your answer in SI
units.
Consider a conical pendulum with a bob of mass m = 78.0 kg on a string of
length L = 10.0 m that makes an angle of 0 = 7.00° with the vertical.
(Consider +î to be towards the center of the circular path and +ĵ to be
%3D
upward.)
L
(a) Determine the horizontal and vertical components of the force
exerted by the string on the pendulum.
NÎ +
Nj
(b) Determine the radial acceleration of the bob.
m/s?
=J (e)
(b) Fe=
()
6. A pendulum that consists of a ball (m = 1.50 kg) attached to a light cord rotates in a circular path of
radius r = 0.800 m at constant speed v, as shown in Figure. Here the angle 0 = 65°, and we ignore air
friction and assume the mass of the light cord is negligible.
(a) Calculate the tension T in the cord.
= L.
(b) Calculate the centripetal force acting on the ball.
= 'd
(c) Calculate the velocity v of this uniform circular motion.
Answers:
Chapter 6 Solutions
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
Ch. 6 - Are the objects described here in equilibrium...Ch. 6 - A ball tosses straight up has v = 0 at its highest...Ch. 6 - Kat, Matt, and Nat are arguing about why a physics...Ch. 6 - If you know all of the forces acting on a moving...Ch. 6 - An elevator, hanging from a single cable, moves...Ch. 6 - An elevator, hanging from a single cable, moves...Ch. 6 - Are the following statements true or false?...Ch. 6 -
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9. The four balls in FIGURE Q6.9 have been...Ch. 6 - Prob. 10CQ
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