Exercise: A student slides a 0.75 kg textbook across a table, and it comes to rest after traveling 1.2 m. Given that the kinetic friction between the book and the table is 2.5N, use the work–kinetic energy theorem to find the book’s initial speed

Coulomb’s law tells us that the electrostatic force between two charged objects can be calculated by: ?= ??1?2/?^2Where k is a constant with a value of 8.99x109 Nm2/C2; ?1 and ?2 are the charges of the two particles (1.602x10-19 C), and r is the distance between the two particles. The force is attractive if the charges of the two particles is opposite (one’s positive and one’s negative) and repulsive if the charges have the same charge (both positive or both negative). Calculate the electrostatic force on proton #1 from the other two protons.Will the gravitational force between the protons be attractive or repulsive? What about the electrostatic force? Which has the larger magnitude, the electrostatic force or the gravitational force? Can the electrostatic and gravitational forces alone create a stable Lithium nucleus?

Fill in the blank: Calculate the work done by these forces. A 10.0 N force is applied to push a block across a friction free surface for a displacement of 5.00 m to the right. Work = (note that your answer must have three significant figures to be marked correct.) Fnorm-20 N Fapp=10 N %3D Fgrav =20 N

A 68.1 kg runner has a speed of 3.50 m/s at one instant during a long-distance event.    For (a) Apply the definition of kinetic energy. For (b) use the work-energy theorem.   (a) What is the runner's kinetic energy at this instant (in J)?   (b) How much net work (in J) is required to triple her speed?

Suppose the ski patrol lowers a rescue sled carrying an injured skiier, with a combined mass of 77.5 kg, down a 60.0° slope at constant speed, as shown in the Figure. The coefficient of kinetic friction between the sled and the snow is 0.100. b)How much work, in joules, is done by the rope on the sled over this distance?

1)A block with a mass of 44.0 kg is pushed with a horizontal force of 150 N. The block moves at a constant speed across a level, rough surface a distance of 6.65 m. Please  draw and show your free body diagrams in your answers. This will also help you to solve the problem! (a)What is the work done (in J) by the 150 N force?    (b)What is the coefficient of kinetic friction between the block and the surface?

Two identical test cars are driving down a test track and hit their brakes at the same position. One car istravelling at twice the speed as the other. (a) Compare the kinetic energies of the two cars. (b) Use the idea of work to explain how much farther the faster car travels while braking

You are moving the box (m=10kg) across a rough floor by pushing on it at an angle of 20° below the horizontal with force of magnitude F=100N. What is the coefficient of kinetic friction between the box and the floor if it is moving at constant velocity? Present free-body diagram. 10° For a situation as in problem 2, calculate work done by you, work done by the force of friction and the net work done if crate was moved 5m.