A box is pushed across the floor for a distance of 5 meters with an inclined force of 50 Newtons, which makes an angle of 20 degrees with the floor, in 5 seconds. a. Calculate the work done in J. b. Calculate the power expended in W.

2. Page 2 > of 7 F=40 30 In this problem, the block moves in the horizontal direction only. A. Find the work done if the force is applied for a distance of d = 2 m. B. If the mass is m= 6 kg and the initial velocity is V- 0. Use the work-energy theorem to find the final velocity C. If the process in part (B) took a time of t = 0.8s, use your answer from part (B) to Calculate the acceleration of the block. D. Now use Newton's second law ( in the x-direction) to calculate the acceleration. Your answers from Part ( C) and ( D) should be pretty close. They're different Because of rounding errors. dy

Physics Problem A 300 N net force was applied 30° North of East on a crate with 50.0 kg mass, which caused it to be displaced 4.00 m east. Solve for the following: a. What is the amount of work done on the crate? b. Assuming that the crate was initially at rest, solve for the: i. crate's acceleration ii. crate's velocity at the end of the 4.00 displacement c. What is the kinetic energy of the crate?

A man pushes an 80-N crate a distance of 5.0 m upward along a frictionless slope that makes an angle of 300 with the horizontal. The force he exerts is parallel to the slope. If the speed of the crate is constant, then the work done by the man is: O a. 140 J O b. 61 J O c. 260 J O d.-200 J O e. 200 J

a 40 N horizontal force is applied to a 6.0 kg box. Friction is negligible. The box moves a horizontal distance of 4.0 meters. The work done by the 40 N force is A. 160 J B. 10 J C. 80 J D. 92 J

A metalsmith at a foundry drags a hunk of steel across the horizontal foundry floor by pulling on it with a 320 N force angled 28° above the floor. If the kinetic friction force due to the floor is essentially constant at 280 N, what is the net work done on the hunk of steel by both the metalsmith and kinetic friction over a distance of 11 m? A. 3100 J B. 3500 J C. 440 J D. 28 J

A grocery cart with a mass of 10 kg is being pushed at constant speed up a 25° ramp by a force Fp which acts parallel to the incline. (Ignore the friction) a. Draw a free-body diagram of the cart showing all the forces acting on it.  b. Find the work done by each of the forces (W, Fn, Fp) on the cart if the ramp is 7.5 m long.  Hints: The question is very similar to the question of a piano sliding down an incline discussed in class. However, here the object is pushed up the incline. The forces Fn = mgcos(0), and Fp = mgsin(0), so don't spend time getting these using Newton's 2nd law. Also, the weight is W = mg. c. Find the net work done on the cart.

Time left 1:10:32 A box weighs 49 N is pulled 6.0 m up along a 37° inclined plane. What is the work done by the weight (gravitational force) of the box? W 37° Select one: O A. -1.77 x 102 J O B. -1.1 x 10² J OC. -0.2 J O D. -11 J OE. -1.4 x 102 J

Imagine Sophia is moving down a slide and her body never leaves the slide.Which is the most correct option?

A 290-kg piano slides 4.2 m down a 35˚ unloading ramp. A man is pushing back on the piano with the force of 820 N at the angle of 20˚ below the plane of the ramp, so that the piano's slide proceeds at constant velocity. Find the work of friction during the slides. a. 2500 J b. -2500 J c. 3600 J d. -3600 J