A child pulls on a wagon with a horizontal force of 75N. If the wagon moves horizontally a total of 42 m in 3.0 min, what is the average power generated by the child? 24.5 W 12.5 W O 22.4 W O 17.5 W

A barge of mass 5.00 x104 kg is pulled along the Erie Canal by two mules, walking along towpaths parallel to the canal on either side of it. The ropes harnessed to the mules make angles of 45.0° to the canal. Each mule is pulling on its rope with a force of 1.40 kN. How much work is done on the barge by both of these mules together as they pull the barge 166.1 m along the canal? 235 8 kJ

A 1300-kg elevator carries a maximum load of 750 kg. A constant frictional force of 3000 N retards its motion upward. What minimum power, (in horsepower), must the motor deliver to lift the fully loaded elevator at a constant speed of 3.50 m/s?      1 horsepower = 746 W

Two blocks are connected by a very light string passing over a massless and frictionless pulley (Figure 1). Traveling at constant speed, the 20.0 N block moves 95.0 cm to the right and the 12.0 N block moves 95.0 cm downward. Figure 20.0 N 1 of 1 12.0 N Part A During this process, how much work is done on the 12.0 N block by gravity? Express your answer with the appropriate units. Ww, 12.0 N = Submit Part B Value WT, 12.0 N = Request Answer During this process, how much work is done on the 12.0 N block by the tension in the string? Express your answer with the appropriate units. Value Units Submit Request Answer ? Units ?

Rory carries a 150-N suitcase up three flights of stairs (a height of 3.5 m) and then drag it along the floor with a horizontal force of 40.0 N at a constant speed of 0.50 m/s through a distance of 5.0 meters. How much work does Rory do on his suitcase during this entire motion? 525 J 725J 200J 5,145 J

The employee pulis a grocery cart loaded with items across the aisle for 12000.0 millimeters. The employee exerts a horizontal force of 110.0 N and the floor exerts a frictional force of 43.0 N as well. What is the net work done on the cart? 804 Joules 1,830 Joulos 1,320 Joules 516 Joules

A bicyclist rides 1.90 km due east, while the resistive force from the air has a magnitude of 7.13 N and points due west. The rider then turns around and rides 1.90 km due west, back to her starting point. The resistive force from the air on the return trip has a magnitude of 7.13 N and points due east. Find the work done by the resistive force during the round trip. Number Units

A car (m = 1.39 x 103 kg) accelerates uniformly from 3.75 to 18.5 m/s in 7.50 sec. Assume that a single horizontal force accelerates the vehicle. a) Determine the work done by this force on the car. b) Determine the average power required to accelerate the car.

A lawn mower tractor pulls a large and heavy sled during a pulling game at a county fair. The force during the pull is monitored and recorded by instruments. The figure shows the force as a function of displacement. F (KN) 12 11 10 9 8 7 6 5 4 3 2 1 0 6 7 8 9 10 11 12 x (m) What was the total amount of work done by the tractor? 74.5 kJ 0 1 2 3 4 5 Incorrect. What was the average power of the tractor, if the pull lasted for 7.90 seconds? 9.43 W Incorrect.

A 1.9 kg book is lying on a 0.75mm high table. You pick it up and place it on a bookshelf 2.1 mm above the floor. During this process, how much work does gravity do on the book? During this process, how much work does your hand do on the book?   Express your answer with the appropriate units.