man pushing a crate of mass m92.0 kg at a speed of v0.860 m/s encounters a rough horizontal surface of length -0.65 m as in the figure below. If th coefficient of kinetic friction between the crate and rough surface is 0.357 and he exerts a constant horizontal force of 286 N on the crate. (a) Find the magnitude and direction of the net force on the crate while it is on the rough surface. magnitude direction (b) Find the net work done on the crate while it is on the rough surface. (c) Find the speed of the crate when it reaches the end of the rough surface. m/s
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- A 100. N block sits on a rough horizontal floor. The coefficient of sliding friction between the block and the floor is 0.250. A horizontal force of 90.0 N acts on the block for 3.00 seconds. Calculate the velocity of the block after 3.00 seconds if it starts from rest.An object moves with an initial speed of 5.01 m/s. It then enters a region with friction causing the object to come to rest after moving 2.56 m. What is the coefficient of friction?Bob borrows a lunch tray of negligible mass to push Will on the tray across a level portion of the field. The coefficient of kinetic friction between the tray and the grass is 0.25 and the coefficient of static friction is 0.30. Will is pushed 40m across the field by Bob at a constant speed, but Bob is so tall that he pushes with a force of 40 degrees below the horizontal. Will gained some weight during quarantine, so he now weighs 120kg. a) What power does Bob need to move Will across the field in 20sec? b) What could Bob do to decrease the work he needs to push Will across the field without decreasing his force?
- wo blocks are positioned on surfaces, each inclined at the same angle of 52.3 degrees with respect to the horizontal. The blocks are connected by a rope which rests on a frictionless pulley at the top of the inclines as shown, so the blocks can slide together. The mass of the black block is 3.16 kg, and the coefficient of kinetic friction for both blocks and inclines is 0.440. Assume static friction has been overcome and that everything can slide. What is must be the mass of the white block if both blocks are to slide to the LEFT at an acceleration of 1.5 m/s^2? 2.34 kg 1.66 kg 10.38 kg 5.97 kgTwo blocks are positioned on surfaces, each inclined at the same angle of 43.0 degrees with respect to the horizontal. The blocks are connected by a rope which rests on a frictionless pulley at the top of the inclines as shown, so the blocks can slide together. The mass of the black block is 6.15 kg, and the coefficient of kinetic friction for both blocks and inclines is 0.260. Assume static friction has been overcome and that everything can slide. What is must be the mass of the white block if both blocks are to slide to the LEFT at an acceleration of 1.5 m/s^2?A Block Pulled on a Rough Surface A 5.0 kg block initially at rest is pulled to the right along a horizontal surface by a constant horizontal force of 21 N. (a) A block pulled to the right on a rough surface (b) The applied force is at an angle e to the by a constant horizontal force. horizontal. mg mg (For the following, when entering mathematical expression, do not substitute numerical values; use variables only.) (a) Find the speed of the block after it has moved 2.5 m if the surfaces in contact have a coefficient of kinetic friction of 0.16. SOLUTION Conceptualize This example is similar to the example "A Block Pulled on a Frictionless Surface" in Chapter 7, but modified so that the surface is no longer frictionless. The rough surface applies friction force on the block opposite to the applied force. As a result, we expect the speed to be [higher than that found in "A Block Pulled on a Frictionless Surface." Categorize The block is pulled by a force and the rough, so the block d…
- A pack of four velociraptors have caught a human running through their jungle. Each raptor grabs one limb and pulls as hard as it can. One raptor exerts a force of 50.0 N at an angle of 20.0 ̊. Another exerts a force of 30.0 N at an angle of 130.0 ̊, while a third exerts a force of 90.0 N at 160.0 ̊. If the meal remains stationary, i.e. the total force is 0, at what angle and with what force is the fourth raptor pulling? Note that force is a vector. Force is measured in units called Newtons which is abbreviated N.Two blocks are positioned on surfaces, each inclined at the same angle of 51.0 degrees with respect to the horizontal. The blocks are connected by a rope which rests on a frictionless pulley at the top of the inclines as shown, so the blocks can slide together. The mass of the black block is 4.15 kg, and the coefficient of kinetic friction for both blocks and inclines is 0.260. Assume static friction has been overcome and that everything can slide. What is must be the mass of the white block if both blocks are to slide to the LEFT at an acceleration of 1.5 m/s^2? 6.28 kg 4.07 kg 2.65 kg 9.85 kgYou are trying to slide a heavy trunk across a horizontal floor. The mass of the trunk is 85kg, and you need to exert a force of 3.3*10^2 N to make it just begin to move. a)Determine the coefficient of static friction between the floor and the trunk.b)After the trunk starts moving, you continue to push with this force. The trunk reaches a speed of 2.0m/s after 5.0s. Calculate the acceleration of the trunk if the coefficient of kinetic friction between the trunk and the floor is 0.32.
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