A piece of luggage is being loaded onto an airplane by way of an inclined conveyor belt. The bag, which has a mass of 20.0 kg, travels d = 2.50 m up the conveyor belt at a constant speed without slipping. The conveyor belt is inclined at an angle 0 = 60°. Match the work done by each force to the appropriate energy value. The work done by the net force, The work done by the friction. The work done by the conveyor belt. The work done by the force of gravity. The work done by the normal force. 0 Drag answer here Drag answer here Drag answer here Drag answer here Drag answer here -245 J 245 J 425 J -491 J -425 J OJ
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- A block of mass m = 2.50 kg is pushed d = 2.70 m along a frictionless horizontal table by a constant applied force of magnitude F = 18.0 directed at an angle ? = 25.0° below the horizontal (a) Determine the work done by the applied force.= J (b) Determine the work done by the normal force exerted by the table.= J (c) Determine the work done by the force of gravity.= J (d) Determine the work done by the net force on the block.= JA box is supported by a 4.6 N vertical force and carried 2.3 m horizontally across a room at constant speed. Then, the same box is pushed 2.3 m horizontally across a smooth table (smooth enough to ignore friction) by a 4.6 N horizontal force. In which case was more work done on the box by the 4.6 N force? More work was done when the box was pushed across the table. More work was done when the box was carried across the room. The work was the same in each case, since the force and distance were of equal magnitudes in both situations.A roller-coaster car of mass 1.50 × 103 kg is initially at the top of a rise at point Ⓐ. It then moves 35.0 m at an angle of 50.0° below the horizontal to a lower point Ⓑ. (a) Find both the potential energy of the system when the car is at points Ⓐ and Ⓑ and the change in potential energy as the car moves from point Ⓐ to point Ⓑ, assuming y = 0 at point Ⓑ. (b) Repeat part (a), this time choosing y = 0 at point Ⓒ, which is another 15.0 m down the same slope from point Ⓑ.
- An 80000 kg train moving at 20 m/s moves along a track thanks to a steady driving force of 4.5 kN parallel to (along) the track. A frictional force of 5.0 kN brakes the train as it moves. Through what distance does the train move before its speed is reduced to 15 m/s? What is the work (in Joules) done by the driving force? How much energy (in Joules) is expended in friction? What is the change of height along this long stretch of track?A helicopter lifts a 85 kg astronaut 13 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/10. How much work is done on the astronaut by (a) the force from the helicopter and (b) the gravitational force on her? Just before she reaches the helicopter, what are her (c) kinetic energy and (d) speed?A child on a sled is initially at rest on an icy horizontal surface. The sled is pushed until it reaches a final velocity of 6.05 m/s in a distance of 15.6 m. The coefficient of friction between the ice and runners of the sled is 0.200, and the weight of the child and the sled is 375 N. Find the work done by the force pushing the sled.
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- A bicyclist starting from rest applies a force of F = 239 N to ride his bicycle across flat ground for a distance of d = 210 m before encountering a hill making an angle of θ = 17 degrees with respect to the horizontal. The bicycle and rider have a mass of m = 120 kg combined. In this problem, you can ignore air resistance and other losses due to friction.How much work, W in joules, did the rider do before reaching the hill? What is the bicycle's speed, v in m/s, just before the hill? If the cyclist starts coasting at the bottom of the hill, what distance, di in meters, does the bike travel up the incline?A horizontal force of magnitude 41.3 N pushes a block of mass 3.92 kg across a floor where the coefficient of kinetic friction is 0.576. (a) How much work is done by that applied force on the block-floor system when the block slides through a displacement of 4.79 m across the floor? (b) During that displacement, the thermal energy of the block increases by 40.5 J. What is the increase in thermal energy of the floor? (c) What is the increase in the kinetic energy of the block? (a) Number i Units (b) Number i Units (c) Number i UnitsA sled with total mass m = 46.3 kg is pulled a distance d = 17.1 m across a horizontal surface for which the corficcient of kinetic friction with the sled is = 0.196. The pulling force is constant and makes an angle = 31.2° above the horizontal and the sled moves at a constant velocity. Find an expression for the work done by the pulling force in terms of m, acceleration due to gravity g, 0, Hk, and d, and use it find the work done in Joules by the pulling force. Find an expression for the work done on the sled by friction in terms of m, acceleration due to gravity g, 8, HK, and d, and use it to find the work done in Joules by the friction force. What is the net work in Joules done on the sled?