Calculate the work done by a 2.0-N force (directed at a 80° angle to the vertical) to move a 500 gram box a horizontal distance of 500 cm across a rough floor at a constant speed of 0.8 m/s. (HINT: Be cautious with the units.)
Calculate the work done by a 2.0-N force (directed at a 80° angle to the vertical) to move a 500 gram box a horizontal distance of 500 cm across a rough floor at a constant speed of 0.8 m/s. (HINT: Be cautious with the units.)
Mrs. Salcedo's car of mass 2.4 x 10³ kg travelling on the highway when the teacher receives an emergency call. She increased the speed of the car to 33 m/s.The increase in speed results in 3.1 x10^5 J of work done on the car. Determine the initial speed of the car in km/h.
A 500-kg dragster accelerates from rest to a final speed of 110 m/s in 400 m (about a quarter of a mile) and encounters an average frictional force of 1200 N. What is its average power output in watts and horsepower if this takes 7.30 s?
A 80.0-kg person jumps onto the floor from a height of 5.00 m. If he lands stiffly (with his knee joints compressing by 0.500 cm), calculate the force on the knee joints.
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