TYPE YOUR ANSWER. A 72 kg skateboarder with an initial speed of 7.6 m/s goes up a 32° inclined plane (above the horizontal). He goes 3.6 m along the incline and comes to a stop. What is the work done by the friction (in J) assuming that the frictional force is constant? (Hint: Find the vertical height of the inclined plane.) d h

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

Part A - A 65.0-kg file cabinet is sliding down a rough ramp for a distance of 5.00 m from rest as shown. The friction force on the box is 75.0 N. During this process, what is the work done on the cabinet by the friction force, in Joule? Use g = 10.0 m/s2. ((Hint: What is the angle between the friction force and the displacement?) Part B -  A 65.0-kg file cabinet is sliding down a rough ramp for a distance of 5.00 m from rest as shown. The friction force on the box is 75.0 N. During this process, what is the work done on the cabinet by its own weight, in Joule? Use g = 10.0 m/s2. (Hint: What is the angle between the weight force and the displacement?)

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 +b/x, where A and b are constants. What are the Sl units of b? O kg/s? kg · m/s? kg · m? /s? kg · m³ / s? kg m4 /s? none of these

Bob is pulling a box of his toys of mass 15.0 kg along a rough horizontal surface for a distance of 6.00 m. The tension force in the rope is 58.0 N and the angle is 30° with respect to the horizontal. The frictional force on the box is 18.0 N. What is the net work done on the box, in Joule? Use g = 10.0 m/s2. Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.

An 7.7 kg crate is pulled 5.5 m up a 30° incline by a rope angled 17° above the incline. The tension in the rope is 100 N and the crate's coefficient of kinetic friction on the incline is 0.27. For help with math skills, you may want to review: The Vector Dot Product Part A How much work is done by tension, by gravity, and by the normal force? Express your answers in joules to two significant figures. Enter your answers numerically separated by commas. ► View Available Hint(s) IVE| ΑΣΦ WT. WG. W₂ = 525,0, - 207 Submit Previous Answers X Incorrect; Try Again; 8 attempts remaining ? J

A block of mass mm is released from rest on a ramp that is inclined at an angle θθ from the horizontal. The coefficient of kinetic friction between the block and the ramp is μkμk. The block slides a distance dd along the ramp until it reaches the bottom. How much work is done on the block by the force of gravity? Express your answer in terms of mmm, θθtheta, ddd, ggg, and μkμkmu_k. b) How much work is done on the block by the friction force? Express your answer in terms of mmm, θθtheta, ddd, ggg, and μkμkmu_k. c) Use the work-energy theorem to find the speed of the block just as it reaches the bottom of the ramp. Express your answer in terms of mmm, θθtheta, ddd, ggg, and μkμkmu_k.

The figure below depicts a roller coaster track. The roller coaster car has a mass of 155 kg, and the heights of the two hills are h1 = %3D 26.3 m and h2 = 15.3 m. At point A, the roller coaster car has a speed of 7.89 m/s. What is the total mechanical energy (in Joules) at point B? Friction and air resistance can be neglected. A h1 В Roller Coaster

1. a) A boy pulls a wagon 30m along a sidewalk with a rope tension force of 80N.The force is directed 25° above the horizontal. How much work is done by the boy? b) How much work is done if the same tension force is directed parallel to the ground? 2. A 5kg rabbit and a 12kg Irish setter have the same kinetic energy. If the setter is running at a speed of 4m/sec, how fast is the rabbit running? 3. A large tree can evaporate 500kg of water a day. a. If the water is raised 8m, how much energy must be provided by the tree to lift the water this distance? b. If the evaporation occurs over 12 hr. period, what is the average power in watts needed to provide this increase in gravitational energy?

How much work is done when you push a crate horizontally with 120 NN across a 11-mm factory floor? Express your answer to two significant figures and include the appropriate units. WW = 1300 JJ If the force of friction on the crate is a steady 70 NN, find the KE gained by the crate. Express your answer to two significant figures and include the appropriate units.