Work & Energy: A child does 350 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tree house is 4.0 m above the ground. What is the mass of the box? 8.0 kg O 6.7 kg 5.3 kg O 8.9 kg

What is the kinetic energy of a 1400 kg car traveling at 5,35 7.4x 10 J 2.0x 10 J C. 7.3x 10 J 2.8 x 107 J

Humans can produce an output power as great as 20 W/kgW/kg during extreme exercise. Sloths are not so energetic. At its maximum speed, a 4.0 kgkg sloth can climb a height of 6.0 mm in 2.0 minmin. (Figure 1) a. How much work does the sloth do against gravity to climb 6.0 mm? b.What is the sloth’s specific power output during this climb? Express your answer in watts per kilogram.

T3.16 Please help me answer this physics question.

7. A 1650 kg car accelerates up a hill by applying a force of 4.61 × 10³ N parallel to the hill. The hill is at an incline of 13°. m 2016 d = 17 m 13° A. What is the net work done on the car as it travels 17 m up the hill? (Hint: calculate the work done by each force in the system. There are 3 forces. The net work is the sum of the works done by each individual force.) b. What is the change in kinetic energy for the car? at the bottom of the hill. How fast is it moving at the top The car is travelling at a speed of 16 of the hill? I= c) 74°F

Problem1. A block slides on a rough horizontal surface from point A to point B. A force (magnitude P = 2.0 N) acts on the block between A and B, as shown. Points A and B are 1.5 m apart. (a) How much work is done on the block by the force P? (b) If the kinetic energies of the block at A and B are 6.0 J and 4.0 J, respectively, how much work is done on the block by the net force as the block moves from A to B? (c) What is the work done by the friction force? 40° B

A stone of mass 1.0 kg is dropped from rest at the top of a 100.0 meter high building. Assume there is no air resistance. What is the kinetic energy of the stone just before it strikes the ground? The following numerical values may be helpful in this question. G = 6.67 ∙10-11 N∙m2/ kg2 Earth’s mass = 5.98 · 1024 kilograms g = 9.80 m/sec2 1 kilometer = 1000 meters

A block of stone weighs 500 newtons. It is 20m pushed up a slope. a. Neglecting friction, how much force is needed to push it up the incline at constant velocity? Show solutions b. How much work is done to push it up the incline?

A physicist has been studying the effects of an unknown force. The work required to move an object distance x against this force is W = A + bx, where A and b are constants. What are the SI units of b? O kg/s? kg · m/s? O kg - m²/s² kg · m³/s? kg · m4/s² none of these

A rock is sitting on the ground. Which of the following best describes what you can do to the rock to increase it's energy. carry the rock to the right O hold the rock over your head carry the rock to the left O Lift the rock