A 3.8kg box is raised from rest a distance 8.4m by an upward applied force of 7.8N. Find the work done by gravity on the box. Give the numerical value only and include sign if applicable.
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- Figure 3 shows a 40 kg crate that is being pushed with constant velocity at a distance8.0 m along a 30° incline plane by the horizontal force of 500N. The coefficient ofkinetic friction between the crate and the incline, ur is 0,42. Assuming the crate ismoving upwards towards the right, calculate:i) the work done by the applied force, the frictional force and the gravitational force.A 4 kg crate sitting on a horizontal surface is pushed 30 m by a force of 6N applied at an angle of 27o below the horizontal. How much work is done? If it takes 7.8 seconds to push the crate, how much power was expended?Work
- Calculate the work done (in J) by a 75.0 kg man who pushes a crate 3.50 m up along a ramp that makes an angle of 20.0° with the horizontal (see below). He exerts a force of 465 N on the crate parallel to the ramp and moves at a constant speed. Be certain to include the work he does on the crate and on his body to get up the ramp.A mover pushes on a couch with a force of 650.0N at an angle of 35° below the horizontal and moves the couch by 8.25m horizontally. If they instead direct the push purely horizontally (in the direction the couch moves), what will the work be? How do the two values compare?Calculate the work done (in J) by a 75.0 kg man who pushes a crate 4.30 m up along a ramp that makes an angle of 20.0° with the horizontal. (See the figure below.) He exerts a force of 540 N on the crate parallel to the ramp and moves at a constant speed. Be certain to include the work he does on the crate and on his body to get up the ramp.