1. A ball of mass m is attached to a string of length L. The ball is then swung in a circle of radius r such that the string traces out the surface of a cone. For this problem we will neglect air resistance. a. Sketch a pictorial representation of the physical situation and label any quantities of interest. In addition, establish a coordinate system for this problem and draw a free body diagram for the ball. (See sections 1.7 and 5.7 of the text on how to draw a correct pictorial representation and free body diagram.) b. Write down Newton's Second Law using the coordinate system from part (a) and the forces identified on your free body diagram. c. Determine a symbolic expression for the tension T in the string and the angular velocity w of the ball. These should be expressed in terms of the given quantities L, m, r and the acceleration due to gravity, g. Check the physical units of your expressions to make sure that you get the units of force and angular velocity. d. Suppose that we are on the surface of planet Earth and that m = 500 g, L = 1.0 m and r = 20 cm and g 10 m/s?. Determine the numerical value of the tension T and angular velocity w (in rad/s and rpm) given these values.

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1. A ball of mass m is attached to a string of length L. The ball is then swung in a
circle of radius r such that the string traces out the surface of a cone. For this problem
we will neglect air resistance.
a. Sketch a pictorial representation of the physical situation and label any quantities of
interest. In addition, establish a coordinate system for this problem and draw a free
body diagram for the ball. (See sections 1.7 and 5.7 of the text on how to draw a
correct pictorial representation and free body diagram.)
b. Write down Newton's Second Law using the coordinate system from part (a) and
the forces identified on your free body diagram.
c. Determine a symbolic expression for the tension T in the string and the angular
velocity w of the ball. These should be expressed in terms of the given quantities L,
m, r and the acceleration due to gravity, g. Check the physical units of
expressions to make sure that you get the units of force and angular velocity.
your
d. Suppose that we are on the surface of planet Earth and that m =
and r =
500 g, L =
1.0 m
20 cm and g
10 m/s?. Determine the numerical value of the tension T and
angular velocity w (in rad/s and rpm) given these values.
e. Explain in words what would happen to the tension T and angular velocity w if the
ball was swung in the same fashion but on exoplanet Gleise 581g where the
acceleration due to gravity is about 4 times stronger than here on Earth. Then
perform a short calculation to back up your explanation.
Transcribed Image Text:1. A ball of mass m is attached to a string of length L. The ball is then swung in a circle of radius r such that the string traces out the surface of a cone. For this problem we will neglect air resistance. a. Sketch a pictorial representation of the physical situation and label any quantities of interest. In addition, establish a coordinate system for this problem and draw a free body diagram for the ball. (See sections 1.7 and 5.7 of the text on how to draw a correct pictorial representation and free body diagram.) b. Write down Newton's Second Law using the coordinate system from part (a) and the forces identified on your free body diagram. c. Determine a symbolic expression for the tension T in the string and the angular velocity w of the ball. These should be expressed in terms of the given quantities L, m, r and the acceleration due to gravity, g. Check the physical units of expressions to make sure that you get the units of force and angular velocity. your d. Suppose that we are on the surface of planet Earth and that m = and r = 500 g, L = 1.0 m 20 cm and g 10 m/s?. Determine the numerical value of the tension T and angular velocity w (in rad/s and rpm) given these values. e. Explain in words what would happen to the tension T and angular velocity w if the ball was swung in the same fashion but on exoplanet Gleise 581g where the acceleration due to gravity is about 4 times stronger than here on Earth. Then perform a short calculation to back up your explanation.
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