examreview3.pdf

# examreview3.pdf - Exam 3 is at 7 pm tomorrow Conflict is at...

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Exam 3 is at 7 pm tomorrow Conflict is at 5:15 pm in 151 Loomis There are extra office hours today & tomorrow This morning’s HW deadline moved to Friday (80% deadline not moved – still next Tuesday)

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A ladder of weight 60 N leans against a frictionless wall at an angle of q = 70 o as shown in the figure. Friction between the floor and the ladder keeps it from slipping . What is the magnitude of the force of friction, F f , between the floor and the ladder? a. F f = 5.0 N b. F f = 11. N c. F f = 15. N d. F f = 29. N e. F f = 60 N 2. If the angle of the ladder were decreased from 70 o to 50 o , the force of friction required to keep the ladder from slipping would
Consider a student rotating on a stool with angular speed , holding weights in her outstretched hands. If she drops one of the weights to the ground, her angular speed will a. increase b. stay the same c. decrease 4. Now consider a student rotating on a stool with angular speed with no weights in her hands. Suppose someone drops (vertically) a small weight into her horizontally outstretched hand. Her angular speed will

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A wad of gum having mass m = 0.2 kg is thrown with speed v=8 m/s at a perpendicular bar with length d = 1.4 m and mass M . The bar is initially at rest but can rotate freely about a pivot at its center. The gum sticks to the end of the bar and the angular speed of the bar just after the collision is measured to be = 3 rad/s. Assume that the wad of gum is a point particle and assume that the pivot is frictionless. (You do not have to worry about gravity in this problem) 5. What is the magnitude of the angular momentum of the gum with respect to the pivot before it collides with the bar?
A wad of gum having mass m = 0.2 kg is thrown with speed v=8 m/s at a perpendicular bar with length d = 1.4 m and mass M . The bar is initially at rest but can rotate freely about a pivot at its center. The gum sticks to the end of the bar and the angular speed of the bar just after the collision is measured to be = 3 rad/s. Assume that the wad of gum is a point particle and assume that the pivot is frictionless. (You do not have to worry about gravity in this problem) 6. What is the angular momentum of the gum with respect to the pivot after it collides with bar? a. 0.29 kg m 2 /s b. 0.48 kg m 2 /s c. 1.12 kg m 2 /s

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A wad of gum having mass m = 0.2 kg is thrown with speed v=8 m/s at a perpendicular bar with length d = 1.4 m and mass M . The bar is initially at rest but can rotate freely about a pivot at its center.
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• Spring '08
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