1. A mass of 12.0 kg is placed on a table. A string is tied to the mass, and run over a pulley to a hanging mass. If the coefficient of static friction between the mass on the table and the table is 0.342, what is the minimum value of the hanging mass that will start the system moving?
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- 11. Jason works for a moving company. A crate of mass m is sitting on a ramp on his truck; the ramp is angled at an angle with respect to the horizontal. The coefficients of static friction and kinetic friction between the crate and his truck bed are p, and , respectively. What is the magnitude of the force, directed parallel to the ramp, that he needs to exert on the crate to get it to start moving (a) up the ramp and (b) down the ramp? Your answers will be in terms on the symbols m, 0, μs, k and g.11. A 6.0 kg block sits at rest on a 25° inclined plane. If this is the steepest the ramp can be before the block slides, determine the coefficient of static friction between the block and plane. 0.89 0.29 0.68 0.475. A 7.6 kg object is at rest on an inclined plane. If the inclined plane makes an angle with the horizontal of 33°, what is the coefficient of static friction between the object and the plane? Assume the box is just about to slide and this is the maximum static friction.
- 3. A 6.50 kg block is pressed against a vertical wall by a force (F), as shown in the figure below. The coefficient of static friction between the block and the wall is 0.41 and the directional angle 0 for the force is 46º. Determine the magnitude of the force (F) when the block is about to slide up the wall. N F é9. A 75 N crate is at rest on an incline that is inclined a 25° above the horizontal. The coefficient of static friction between the crate and the incline is 0.25 and the coefficient of kinetic friction between the crate and the incline is 0.15. (a) What is the minimum magnitude of a force parallel to the incline that will prevent the crate from sliding down the incline? (b) What is the minimum magnitude of the force parallel to the incline that will start the crate to move up the incline? (c) Include a force (or free body) diagram of each situation.A man pulls a 50.0-kg block of ice with a rope over his shoulder as shown below. Suppose that he applies just enough force to get the block moving and then he continues to apply the same force. If it takes 2.00 seconds for the block to move 3.00 meters and if the coefficient of kinetic friction between the block and the surface is ?? =0.100, determine the coefficient of static friction ?? between the block and the surface. You may assume that the acceleration of the block is constant.
- 4. A block of mass 3.00-kg is pushed against a wall by a force P that makes an angle of 50.0° with the horizontal as shown in the figure below. The coefficient of static friction between the block and the wall is 0.250. a. Determine the possible values for the magnitude of P that allow the block to remain stationary. P10. The drawing shows a baggage carousel at an airport. Your suitcase has not slid all the way down the slope and is going around at a constant speed on a circle (r = 10.0 m) as the carousel turns. The coefficient of static friction between the suitcase and the carousel is 0.70, and the angle 0 in the drawing is 23.0°. Find the speed of your suitcase. m/s 60 ssf60 ssf60 ssf60 ssf60 s. sf60 ssf60 ssf60 sio0 ssfo Ossf60 ssf60 sf60 st ssf60 ssf60 ssf60 ssf60 ssf60 ssf60 ssf60 ssfe1. A box with mass m is dragged across a level floor with coefficient of kinetic friction by a rope that is pulled upward at an angle above the horizontal with a force of magnitude F. In terms of the variables given, write an expression for the mass of the box needed so that it moves across the floor at a constant speed.