• D. 4.1 30 N 30 N 2. Four forces are acting on a 3-kg object as shown in the diagram. If the object is accelerating to the right at a rate of 5 m/s2, the magnitude of force F must be a. 15 N b. 25 N c. 40 N d. 55 N -z 3. A 1.0-kilogram block is placed on each of four frictionless planes inclined at different angles. On
• 25. Two guys hold opposite ends of a 4m long board of mass 20 kg, with a center of mass 2m from the ends. a) Draw a free-body diagram for the board. b) If "Lefty" can lift no more than 40 kg, and Dexter can lift only 60 kg, how far from "Lefty" should one place an 80 kg mass on the board so that both workers can lift it? 26.
• Two blocks, of mass 8 kg and 4 kg respectively, are joined with an inelastic string of negligible mass. The string runs over a frictionless pulley. The 8 kg block is on a horizontal surface whilethe 4 kg block is on an inclined plane of 40° with the horizontal. The coefficient of kinetic friction for both blocks is 0,2.
41. Two objects of mass 0.2 kg and 0.1 kg, -axis, as shown above. The 0.2 kg object overtakes and the collision, the y-component of the velocity of the 0.2 kg object is 1 m/s upward. What is the y-component of the velocity of the 0.1 kg object immediately after the collision? (A) 2 m/s downward (B) 0.5 m/s downward (C) 0 m/s (D) 0.5 m/s upward
a block of mass m = 50 kg moves on a rough horizontal surface with a coefficient of kinetic friction μ= .5. the traveled distance is 20 m. how much work is done by the friction force? -5000 J a car travels with a constant speed of 15 m/s. the cars engine produces a 4000 N pushing force in order to keep the speed constant. how much power is ...
Jul 19, 2017 · A body of mass 5 kg is placed on a rough horizontal surface. if coefficient of friction is 1/√3 find what pulling force should act on the body at an angle 30 degree to the horizontal so that the body just begins to move?
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• # A block of mass 1 kg is placed on a rough horizontal surface of a car

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Two blocks are attached by a massless string over a massless pulley. The coefficient of kinetic friction between the block and the horizontal surface is k = 0.4. The system starts from rest. The block on the surface has a mass of 3 0 kg and the hanging blockblock on the surface has a mass of 3.0 kg and the hanging block has a mass of 5.0 kg.

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• Oct 14, 2015 · 12. A small block of mass m 1 = 0.4 kg is placed on a long slab of mass m 2 = 2.8 kg. Initially, the slab is stationary and the block moves at a speed of v o = 3 m/s. The coefficient of kinetic friction between the block and the slab is 0.15 and there is no friction between the slab and the surface on which it moves. a.
• a block of mass m = 50 kg moves on a rough horizontal surface with a coefficient of kinetic friction μ= .5. the traveled distance is 20 m. how much work is done by the friction force? -5000 J a car travels with a constant speed of 15 m/s. the cars engine produces a 4000 N pushing force in order to keep the speed constant. how much power is ...

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10. A uniform rod (length = 2.4 m) of negligible mass has a 1.0-kg point mass attached to one end and a 2.0-kg point mass attached to the other end. The rod is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through a point 1.0 m from the 2.0-kg mass. The rod is released from rest when it is ...

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• Two blocks are attached by a massless string over a massless pulley. The coefficient of kinetic friction between the block and the horizontal surface is k = 0.4. The system starts from rest. The block on the surface has a mass of 3 0 kg and the hanging blockblock on the surface has a mass of 3.0 kg and the hanging block has a mass of 5.0 kg.
• At an instant t=0, Block A of mass 1 kg is moving with speed g m/s towards right on rough surface of block B of mass 3 kg. Block B, which is placed on smooth horizontal surface is moving with speed 4 m/s towards right at same instant (t=0).

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A 15.2 kg block dragged over rough horizontal surface by constant force of 124N acting at an angle of 34.9 degrees above the horizontal. The block is displaced 37.8m. The coefficient of kinetic friction is .171. Acceleration is 9.8 m/s^2. Find the work done by the 124N force. Find the magnitude of the work done by the force of friction. Find the work done by the normal force.

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1.273. A uniform rod of mass m = 5.0 kg and length l = 90 cm rests on a smooth horizontal surface. One of the ends of the rod is struck with the impulse J = 3.0 N*s in a horizontal direction perpendicular to the rod. As a result, the rod obtains the momentum p = 3.0 N*s.

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Box 2, a cardboard box, sits on top of box 1. It has a mass of 1.30 kg. The coefficient of kinetic friction between the two boxes is 0.45. The two boxes are linked by a rope which passes over a pulley at the top of the incline, as shown in the diagram. The inclined plane is at an angle of 38.0° with respect to the horizontal.

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A 4.00-kg block of ice is placed against a horizontal spring that has force constant and is compressed 0.025 m. The spring is released and accelerates the block along a horizontal surface. You can ignore friction and the mass of the spring. (a) Cal-culate the work done on the block by the spring during the motion

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A block of mass 22 kg is placed on a rough inclined surface and is connected to a 15 kg block which hangs vertically by means of a light inextensible string passing over a frictionless pulley, as shown in the diagram below. When the inclined surface is at an angle 9 to the horizontal, the 15 kg block moves downwards (as shown by

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Sep 08, 2016 · A block of mass 1.5 kg is placed on a rough table (horizontal) and is pulled by a constant force of 1.2 kgf. The coefficient of friction between the block and the surface is 0.3. Find the...

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