ball of mass m = 0.405 kg is attached to a (massless) string of length L = 2.35 m and is undergoing circular motion in the horizontal plane. a) Which force plays the role of the centripetal force? true / false  spring force true / false  normal force true / false  tension force true / false  gravitational force true / false  frictional force b) What should the speed of the mass be for θ to be 45°? c) What is the tension in the string?

College Physics
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Chapter7: Rotational Motion And The Law Of Gravity
Section: Chapter Questions
Problem 8WUE: A car of mass 1 230 kg travels along a circular road of radius 60.0 m at 18.0 m/s. (a) Calculate the...
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ball of mass m = 0.405 kg is attached to a (massless) string of length L = 2.35 m and is undergoing circular motion in the horizontal plane.

a) Which force plays the role of the centripetal force?
true / false  spring force
true / false  normal force
true / false  tension force
true / false  gravitational force
true / false  frictional force

b) What should the speed of the mass be for θ to be 45°?

c) What is the tension in the string? 

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