A gardener pushes a 12 kg lawnmower whose handle is tilted up 37deg above horizontal. The lawnmower's coefficient of rolling friction is 0.15. How much power does the gardener have to supply to push the lawnmower at a constant speed of 1.2 m/s? Assume his push is parallel to the handle.

A 145 kg crate slides down a ramp, starting from rest. The ramp is inclined at an angle of 20.6 degrees with respect to the horizontal and has a height of 1.74 m. The crate is placed on frictionless casters so that it slides down the ramp without friction. What is the final speed of the crate (in m/s) just as it reaches the bottom of the ramp? Use g = 9.81 m/s?.

The speed of a block moving on a horizontal frictional surface changes from vi = 15 m/s to vf = 12.5 m/s in a distance of d = 9.5 m. How long in seconds did it take for the block to slow by this amount, assuming the acceleration is constant? If the block has a mass of 1 kg, What is the power supplied to the block by friction? What is the coefficient of kinetic friction between the block and surface μk?

Question 3

Same set-up for the conservation of energy was performed. The 5-g marble covered a horizontal distance of 40 cm from the edge of the ramp (horizontal) from an elevation of 15 cm above the ground. What is the time (in seconds) needed for the marble to fall from the edge of the ramp to the ground? Use g=9.8m/s2. Round off your answer to two decimal places.

In the figure here, a block of ice slides down a frictionless ramp at angle 0=51.0 the ramp. As the block slides down through distance d = 0.580 m along the ramp, its kinetic energy increases by 83.0 J. How much greater would its kinetic energy have been if the rope had not been attached to the block? while an ice worker pulls on the block (via a rope) with a force that has a magnitude of 51.0N and is directed up F, Number Unit