Your friend (mass 65.0 kg) is standing on the ice in the middle of a frozen pond. There is very little friction between her feet and the ice, so she is unable to walk. Fortunately, a light rope is tied around her waist and you stand on the bank holding the other end. You pull the rope for 3.00 s and accelerate your friend from rest to a speed of 6.00 m/s while you remain at rest. What is the average power supplied by the force you applied?

A 1000-kg car accelerates from 0 to 15 m/s in 5.0 s with negligible friction and air resistance. What is the average power delivered by the engine? 7500 W O 45000 W O 1500 W O 22500 W O 112500 W

A 7.44-kg particle is subject to a net force that varies with position as shown in the figure. The particle starts from rest at x = 0. Fx (N) 3 2 2 4 6 8 10 12 14 16 What is its speed at the following positions? (a) x = 5.00 m 154.32 X Can you determine the kinetic energy of the particle at x = 5.00 m from the given graph? m/s (b) x = 10.0 m 154.33 x (m) X You appear to have added your result from part (a) to a speed calculated from the work done between 5 and 10 m. This doesn't work; you must calculate the work done over the entire 10 m distance. m/s (c) x = 15.0 m 151.31 X The force is positive throughout the entire interval. Does it make sense that the speed would decrease m/s

A 6.2 kg object is moving in the positive x direction. When it passes through x = 0, a constant force directed along the axis begins to act on it. The figure here gives its kinetic energy K versus position x as it moves from x = 0 to x = 5.0 m; Ko = 23 J. The force continues to act. What is speed v when the object moves back through x = -2.9 m? K (J) Ko x (m)

A particle, mass 8 kg, moves along the y axis with a speed of 3.3 m/s. It experiences a force of 16 N directed along the x axis. What power is imparted to the particle by the force 9.69 J/s x 9.69

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 ?

A railroad locomotive accelerates a 95,000-kg railcar from 10 m/s to 25 m/s in 90 seconds. What was the average power transferred to the boxcar during this process? 25 MW 280 kW 330 kW 2.3 MW 48 kW

Q E mand 6. A 29.00-kg child initially at rest slides down a playground slide from a height of 3.30 m above the bottom of the slide. If her speed at the bottom is 3.00 m/s, how much energy is lost due to friction? $ 4 S $10 J NO R F 5 T G ^ 6 B MacBook Air H & N U J 8 M 9 K MOSISO H P command option

A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 2.50 x 105 N. In being launched from rest it moves through a distance of 93.6 m and has a kinetic energy of 4.37 x 107 J at lift-off. What is the work done on the jet by the catapult?

A 2000 kg car with a 250 HP (1.865 X 105 W) engine accelerates from rest. If all the engine’s power is used to change the car’s speed during the entire trip, how much time does it take for the car to reach 100 mph (44.7 m/s)? Group of answer choices 10.7 s 4.81 s 6.78 s 15.1 s