An 7.6 kg crate is pulled 4.7 m up a 30° incline by a rope angled 18° above the incline. The tension in the rope is 140 N and the crate's coefficient of kinetic friction on the incline is 0.24. 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) ΠΗΓΙ ΑΣΦ WT, WG, W₁ = Submit Part B What is the increase in thermal energy of the crate and incline? Express your answer in joules to two significant figures. ► View Available Hint(s) [5] ΑΣΦ AEth= Submit ? ? J J

A factory worker moves a 20.0 kg crate a distance of 4.40 m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and the floor is 0.200.   Part A: What magnitude of force must the worker apply?   Part B: How much work is done on the crate by the worker's push?   Part C: How much work is done on the crate by friction?   Part D: How much work is done by the normal force and by the gravity?   Part E: What is the net work done on the crate?

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

Consider the woman doing push-ups in the figure. She has a mass of 49.2 kg, and the distance from her feet to her center of mass is 0.96 m, while the distance from her feet to her hands is 1.75m. a. How much work in joules does she do if her center of mass rises 0.27 m?  b. What is her useful power output, in watts, if she does 25 pushups in one minute? For the sake of simplicity, ignore any power used by her muscles lowering her body during each pushup.

A 60 kg skydiver parachutes from a stationary helicopter at a height of 2,000 m above the ground. After the skydiver reaches a predetermined speed, the parachute opens, slowing the skydiver down. With the parachute open, the skydiver reaches a terminal velocity of 8.5 m/s. Calculate the work done by air resistance during the descent from the height of the helicopter to the ground. Write your answer to four significant figures. kJ

n eText Part B A microwave oven of mass 10.0 kg is pushed a distance 8.45 m up the sloping surface of a loading ramp inclined at an angle of 38.6 ° above the horizontal, by a constant force F with a magnitude 140 N and acting parallel to the ramp. The coefficient of kinetic friction between the oven and the ramp is Area What is the work done on the oven by the friction force? nent Sharing Take the free fall acceleration to be 9.80 m/s . 0.280. ettings e Tools Wi 185.09 J Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Part C Compute the increase in potential energy for the oven. Take the free fall acceleration to be 9.80 m/s . ΑΣΦ ? J P Pearson Copyright 2022 Pearson Education Inc. All rights reserved. I Terms of Use | Privacy Policy I Permissions | Contact - Type here to search 080 080- TIT

An object moving in the xy-plane is subjected to the force F = (2xyî+x²) N, where x and y are in m. Part A The particle moves from the origin to the point with coordinates (a, b) by moving first along the x-axis to (a,0), then parallel to the y-axis. How much work does the force do? Express your answer in terms of the variables a and b. W = Submit Part B W = Π| ΑΣΦ Submit Request Answer The particle moves from the origin to the point with coordinates (a, b) by moving first along the y-axis to (0, b), then parallel to the x-axis. How much work does the force do? Express your answer in terms of the variables a and b. V—| ΑΣΦ ? Request Answer ?

A box of 10 kg mass is sliding down a ramp with 60 degree inclination for 5 meters. The kinematic coefficient of friction is 0.3. What is the magnitude of work done by the friction force, in Newtons? Use g = 10 m/s2. Neglect the sign when entering your answer.

A block of weight w = 25.0 N sits on a frictionless inclined plane, which makes an angle θ = 30.0 ∘ with respect to the horizontal, as shown in the figure. A force of magnitude F = 12.5 N applied parallel to the incline, is just sufficient to pull the block up the plane at constant speed. Part A The block moves up an incline with constant speed. What is the total work Wtotal done on the block by all forces as the block moves a distance L = 2.70 m up the incline? Include only the work done after the block has started moving at constant speed, not the work needed to start the block moving from rest. Part B What is Wg, the work done on the block by the force of gravity w⃗  as the block moves a distance L = 2.70 m up the incline? Part C What is WF, the work done on the block by the applied force F⃗  as the block moves a distance L = 2.70 m up the incline?   Part D What is WN, the work done on the block by the normal force as the block moves a distance L = 2.70 m up the inclined plane?

A A parent pulls a child in a wagon at a constant speed, exerting a force of F = 55N at an angle of 30° with respect to the horizontal sidewalk. (a) How much work do they do, if they pull the wagon for a distance of 30m? (b) What is the force of friction on the wagon?