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What is the magnitude of the frictional force on the crate

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Projectile Motion, Circular Motion, Applications of Newton's Laws Practice Problems

Question 1. A ball is thrown horizontally from the roof of a building 45.0 m tall and lands 24.0 m from the base. What was the ball's initial speed?

Question 2. A football is kicked at ground level with a speed of 18.0 m/s at an angle 350 to the horizontal. How much later does it hit the ground?

Question 3. Arlene is to walk across a "high wire" strung horizontally between two buildings 10.0 m apart. The sag in the rope when she is at the midpoint is 10.00 as shown in the figure. If her mass is 50.0 kg, what is the tension in the rope at this point?

128_figure2.jpg

Question 4. A 20-N crate rests on a rough horizontal floor. A 6-N horizontal force is then applied to it. If the coefficients of friction are μs = 0.5 and μk = 0.4, what is the magnitude of the frictional force on the crate?

Question 5. A 0.45-kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.3 m on a frictionless horizontal surface. If the cord will break when the tension in it exceeds 75 N, what is the maximum speed the ball can have?

Reference no: EM132610803

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