A package is at rest on a conveyor belt which is initially at rest. The belt is started and moves to the right for 1.3 s with a constant acceleration of 2 m/s?. Knowing that the coefficients of Coulomb friction between the package and the belt are 4, = 0.35 and µ = 0.25, determine: (a) whether the package slides during that 1.3s time interval; and (b) the work of the friction force on the package during that 1.3s interval.
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- 1) A 200 N block is pushed up a frictionless, 30°, 3 m inclined plane by a force F parallel to the inclined plane. The speed of the block at the bottom of the h inclined plane is 0.5 m/s and 4 m/s at the top. Draw the free body diagram and find; 30° a) The work done by the force F and the magnitude of the force F, b) If the frictional coefficient between the block and the inclined plane surface is 0.15, the speed of the block at the top of the inclined plane under the same force. (Use Work-Energy Theorem)A 5.0-kg box rests on a horizontal surface. The coefficient of kinetic friction between the box and surface is μK = 0.50. A horizontal force pulls the box at constant velocity for 10 cm. Find the work done by (a) the applied horizontal force, (b) the frictional force, and (c) the net force.A 8 kg mass slides to the right on a surface having a coefficient of friction 0.24 as shown. The mass has a speed of 5 m/s when contact is made with a spring that has a spring constant 166 N/m. The mass comes to rest after the spring has been compressed a distance d. The mass is then forced toward the left by the spring and continues to move in that direction beyond the unstretched position. Finally the mass comes to rest a distance D to the left of the unstretched spring. v₁ = 0 8 kg 8 kg 5 m/s 8 kg m v₂ = 0 166 N/m mmmmmmmm გ D- 8 kg kg mmmmmm vf. 8 kg m 166 N/m mmmmmm μ = 0.24 Find the compressed distance d. The accel- eration of gravity is 9.8 m/s². Answer in units of m. Your response... i Previous Responses X #1.3.334 PALETTE
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- A 1.26E+2 kg crate is being pushed across a horizontal floor by a force P that makes an angle of 33.0° below the horizontal. The coefficient of kinetic friction is 0.224. What should be the magnitude of P, so that the net work done by it and the kinetic frictional force is zero?A 2.5 kg mass is initially at rest on a horizontal surface. An applied force acts in the +x direction resulting in a displacement of 1.50 m. If the speed of the mass is 4.00 m/s at the 1.50 m mark and the applied force is 22.0 N, what amount of work was done by friction?A cord is used to vertically lower an initially stationary block of mass M = 1.9 kg at a constant downward acceleration of g/3. When the block has fallen a distance d = 4.1 m, find (a) the work done by the cord's force on the block, (b) the work done by the gravitational force on the block, (c) the kinetic energy of the block, and (d) the speed of the block. (Note : Take the downward direction positive)
- A car is traveling on a level road with speed v0 at the instant when the brakes lock, so that the tires slide rather than roll. (a) Use the work–energy theorem to calculate the minimum stopping distance of the car in terms of v0, g, and the coefficient of kinetic friction mk between the tires and the road. (b) By what factor would the minimum stopping distance change if (i) the coefficient of kinetic friction were doubled, or (ii) the initial speed were doubled, or (iii) both the coefficient of kinetic friction and the initial speed were doubled?A 6250-kg satellite is in a circular earth orbit that has a radius of 2.43 x 107 m. A net external force must act on the satellite to make it change to a circular orbit that has a radius of 7.48 × 106 m. What work must the net external force do? Note that the work determined here is not the work Wlift done by the satellite's engines to change the orbit. Instead, the work W is W = Wlift + Wgravitational, where Wgravitational is the work done by the gravitational force. Number i Save for Later Units Attempts: 0 of 3 used Submit AnswerA 325 N force is pulling on an 85.0 kg refrigerator as it slides across a horizontal floor. The force acts at an angle of 25.0° above the horizontal surface of the floor. The coefficient of kinetic friction between the refrigerator and the floor is 0.150, and the refrigerator moves a distance of 5.50 m. Find (a) the work done by the pulling force, (b) the work done by the force of kinetic friction, (c) the net amount of work done on the refrigerator, and (d) if the refrigerator was initially at rest determine the speed of the refrigerator after the 5.50m displacement. (e) Include a force (or free-body) diagram of the situation. ]