A 101-kg man is skiing across level ground at a speed of 9.5 m/s when he comes to the small slope 1.8 m higher than ground level shown in the following figure.   a. If the skier coasts up the hill, what is his speed when he reaches the top plateau? Assume friction between the snow and skis is negligible. b. What is his speed when he reaches the upper level if an 80-N frictional force acts on the skis?

A model train powered by an electric motor accelerates from rest to 0.600 m/s in 26.0 ms. The total mass of the train is 670 g. What is the average power (in W) delivered to the train by the motor during its acceleration?  W

A C A student builds a roller coaster as shown. The heights of the points are A= 2.1 m B= 0.9 m C= 0 m. The mass of the marble is 5 g. Assume the ball is released at point A on the track and there is no friction. How much energy does the marble start with? units How much gravitational potential energy does the marble have at point A? units What is the velocity at point A? units B SI

There is a 23.1 kg box that starts with an initial velocity of 23.5 m/s. The box moves up a hill where it encounters a frictional force of 319 Newtons over the course of 6 meters. It then moves down a shorter hill.A.How much work was done on the box? JoulesB.What is the box's final velocity? m/s

A box of mass 4.0 kg hangs by a cable from the ceiling of an elevator. The elevator is moving up at a steady speed of 5.0 m/s for 8.0 m. Use g = 10 m/s2. Consider the system is the box and the Earth. Match the answers with questions.

ь. 23 N C. 36 N d. 15 N 28 N 11. A champion athlete can produce one horsepower (746 W) for a short period of time. The number of 16 cm high steps a 70 kg athletr could ascend in one minute while expending one horsepower is a. 4. b. 7. 65. d. 408. e. 4 567. hp

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The force shown in the figure(Figure 1) acts on a 1.3-kg object whose initial speed is 0.35 m/s and initial position is x=0.27m. a. Find the speed of the object when it is at the location x=0.99 m. b. At what location would the object's speed be 0.25 m/s?

1. A 10 kg at a mail facility slides down a 10-meter sorting chute. The height of the chute is 2 meters. The speed of the package at the top of the chute is 5 m/s, and it is moving at 3 m/s when it reaches the bottom. Let g = 10 m/s². Write the relations you use symbolically before substituting in numbers. a. What is the change in the kinetic energy of the package when it slides down the chute? Be careful with the sign (+/-)! 2m Normal Force: M e. What is the magnitude of the frictional force? b. Determine whether the work done by gravity and the normal force on the package is positive, negative, or zero. Hint: Draw each force vector and displacement vector with their tails together. Think about angle between the force and displacement. Gravity: 20 m 9.8 m What is the work done by gravity as the package slides down the chute? Be careful with the sign (+/-) d. How much mechanical energy became thermal energy during this process, i.e., what is AEtherm? Use the work- energy relation with…

QUESTION 21 A block of mass 2.0 kg is moving to the right and changes its speed from 3.0 m/s to 1.0 m/s. Match the answers with questions. ✓ What is its initial kinetic energy? A. none of the given ✓ What is its final kinetic energy? B. 1.0 J ✓ What is the change in kinetic energy? C. 8.0 J D. -8.0 J E. 9.0 J F. -4.0 J G.4.0 J