• 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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    Jan 14, 2018 · A) 200. kg m/s B)50.0 kgm/s C) 20.0 kg m/s D) 12.5 kg m/s 1.A 5.00-kilogram block slides along a horizontal, frictionless surface at 10.0 meters per second for 4.00 seconds. The magnitude of the block's momentum is A) speed of the box B)mass of the contents of the box C) magnitude of the horizontal force applied to the box Jan 14, 2018 · A) 200. kg m/s B)50.0 kgm/s C) 20.0 kg m/s D) 12.5 kg m/s 1.A 5.00-kilogram block slides along a horizontal, frictionless surface at 10.0 meters per second for 4.00 seconds. The magnitude of the block's momentum is A) speed of the box B)mass of the contents of the box C) magnitude of the horizontal force applied to the box Q9) A block of mass 0.52 kg is sliding on a rough horizontal surface. If the block has an initial speed of 60 m/s, and slides a distance of 2200 m before coming to rest, the work done by friction (in J) is: D) —414 A) -36 B) -14 C) 936 E) -122 QIO) Two blocks of mass ml = 3.0 kg and mass = 14 kg are sitting on the floor of a container as ... 1. a 15- mass tra at 5 S 2. a 10-kg mass traveling at I()rn/s 3. a 10-kg mass traveling at 5 m/s 4. a 5-kg mass traveling at 15 m/s 17. Which object has the greatest inertia? 1. a 0.010-kg bullet traveling at 90 m/s 2. a child traveling at 10 m/s on her bike 3. 490- e hantwalkin witha s ed of I m/s 4. a 1500-kg car at rest in a parking lot Feb 15, 2011 · 7) A block of mass m is at rest on a frictionless, horizontal table placed in a laboratory on the surface of the Earth. An identical block is at rest on a frictionless, horizontal table placed on the surface of the Moon. Let F be the net force necessary to give the Earth-bound block an acceleration of a across the table. Jul 12, 2012 · 45. A block with initial velocity 4.0 m/s slides 8.0 m across a rough horizontal floor before coming to rest. The coefficient of friction is: (A) 0.80 (B) 0.40 (C) 0.20 (D) 0.10 (E) 0.05. 46. A car whose mass is 1500 kg is accelerated uniformly from rest to a speed of 20 m/s in 10 s. The magnitude of the net force accelerating the car is: The coefficient of kinetic friction on the hill is 0.40. What is the coefficient of kinetic friction between the horizontal surface and the sled? A) 0.10. B) 0.20. C) 0.31. D) 0.40. E) 0.60. Answer: C. Var: 1 91) A 0.12-kg block is held in place against the spring by a 35-N horizontal external force. smooth horizontal ground and its end B against a rough vertical wall. The coefficient of friction between the ladder and the wall is 1 4. The centre of mass of the ladder is 1.5 metres from A. The ladder lies in a vertical plane perpendicular to the wall and the ground, and is inclined at an angle θ to the horizontal, where tan 2θ= . Rotational Kinematics and Energy: Two Blocks and a Pulley Block 1 (mass M1) rests on a horizontal surface. A horizontal string is attached to the block, passing over a pulley to a hanging block having mass M2 which hangs vertically a distance h from the floor. The pulley is a uniform cylinder of mass M and radius R. The string has b. Block A, of mass 25.0 kg, is traveling to the right with speed 2.00 m/s. It collides with block B, of mass 40.0 kg, traveling with speed v B. They stick together after the collision and the surface on which they slide is frictionless. If the final velocity of both blocks together after the collision is 6.00 m/s to the left, find the Jun 11, 2015 · Homework Statement [/B] A block with mass m1 = 9.2 kg is on an incline with an angle θ = 36° with respect to the horizontal. For the first question there is no friction, but for the rest of this problem the coefficients of friction are: μk = 0.33 and μs = 0.363. 1.) When there is no friction... A block of mass 1 kg lies on a horizontal surface in a truck. The coefficient of static friction between the block and the surface is 0.6. If the acceleration of the truck is 5 ms -2, the frictional force acting on the block is 0Question Completion Status QUESTION 11 A block of mass m; -8.00 kg is placed on a rough horizontal surface. The block is connected by a string going over a massless and frictionless polley to a second block of mass m2 -6,00 kg as shown in the figure.15) Block A, with a mass of 4 kg, is moving to the right with a speed of 2.0 m/s while block B, with a mass of 8 kg, is moving to the left with a speed of 3m/s. The center of mass of the two block-system is moving with a velocity of: a) 1.3 m/s to the left b) 1.3 m/s to the right c) 2.7 m/s to the right d) 2.7 m/s to the left. 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 Two blocks, of mass 4.0 and 6.0 kg are joined by a string and rest on a frictionless horizontal table. If a force of 100 N is applied horizontally on one of the blocks, find the acceleration of each block and the tension in the string. [a = 10 ms-2, T = 40 N] EXAMPLE Two masses of m = 4.0 kg and M = 6.0 kg are joined together by a string that coefficient of static friction at the horizontal surface. Ans. = 0.761 A man pedals his bicycle up a 5 percent grade on a slippery road at a steady speed. The man and bicycle have a combined mass of 82 kg with mass center at G. If his rear wheel is on the verge of slipping, determine the coefficient of friction between the rear tire and the road. Block A has a mass of 40 kg, and block B has a mass of 8 kg. The coefficients of friction between all surfaces of contact are s 0.20 and k 0.15. If P 0, determine (a) the acceleration of block B, (b) the tension in the cord. Block A has a mass of 40 kg, and block B has a mass of 8 kg. 20 kg rests on a surface for which the static and kinetic coefficients of friction are 0.60 and 0.40, respectively. The ropes are mass- less. What is the maximum mass of block A for which the system Rope I Rope 2 FIGURE EX7.16 60 kg 100 kg FIGURE EX7.17 remains in equilibrium? FIGURE EX7.7 8. Il A 1000 kg car pushes a 2000 kg truck that has a ... 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. OnThe coefficient of kinetic friction on the hill is 0.40. What is the coefficient of kinetic friction between the horizontal surface and the sled? A) 0.10. B) 0.20. C) 0.31. D) 0.40. E) 0.60. Answer: C. Var: 1 91) A 0.12-kg block is held in place against the spring by a 35-N horizontal external force. A block with a mass of 3.1 kg is placed at rest on a surface inclined at an angle of 45° above the horizontal. The coefficient of static friction between the block and the surface is 0.50, and a force of magnitude F pushes upward on the block, parallel to the inclined surface.A car of mass 400 kg is moving up a straight road inclined at an angle to the horizontal, where sin = . The resistance to motion of the car from non-gravitational forces is modelled as a constant force of magnitude R newtons. When the car is moving at a constant speed of 20 m s–1, the power developed by the car’s engine is 10 kW.
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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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