Question 8 This graph shows different types of energy for a roller coaster car that starts at the top of Energy of a Roller Coaster Car a large hill and goes down to its lowest point at 6 s. 500 450 400 According to the graph, what is the most likely relationship between height and potential energy? 350 2 300 5 250 2 200 150 100 50 8. 10 Time (s) Mechanical Energy ....... Potential Energy -- Kinetic Energy Your answer: O They are directly related. O They are inversely related. O There is no relationship between the two. O There is not enough information for a conclusion.

1. Refer to figure 1. The 10.0 kg green cart travels down a ramp - from point A to B. Calculate its starting potential energy, kinetic energy at the bottom of the ramp, and its velocity coming off the bottom of the ramp. If the cart coasts from points B to C, did it do any work? How far up the 2nd ramp does the cart go as measured from the ground? 10.0m Figure 1 B

Review A Bookmark Stewart, Justin Physics: Unit 3- Energy / 1 of 4/ Activity 1 Task: Potential & Kinetic Energy Activity 1 of 5 At what point in this roller coaster does the roller coaster have the most gravitational potential energy? A roller coaster starts from rest at point A. The mass of the cart with O A. Point A riders is 900 kg. The motor of the roller coaster does work to get the car up the hill to point B. From point B, the car relies on energy transformations to make it through the rest of the shown portions of the roller coaster. [g=9.8 m/s²] B. Point B C. Point C O D. Point D A

A woman at the gym lifts a weight upwards. a) Does she do positive work on the weight, negative work on the weight, or no work on the weight? Explain how you know. b) Does the Earth (i.e. the force of gravity) do positive work on the weight, negative work on the weight, or no work on the weight? Explain how you know.

1. A roller-coaster car with a mass of 1200 kg starts at rest from a point 20 m above the ground. At point B, it is 9 m above the ground. [Express your answers in kilojoules (kJ).] a. What is the initial potential energy of the car? b. What is the potential energy at point B? c. If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 40 000 J (40 kJ), what is the kinetic energy of the car at point B 2. The time required for one complete cycle of a mass oscillating at the end of a spring is 0.80 s. What is the frequency of oscillation?

QUESTION 9 While moving a package up and down on a storage shelf the mover does +500 J of work and gravity does-500 J of work. Which statement is true about the Potential Energy and the Kinetic Energy of the package: A. The Potential Energy of the package is decreased. B. The Potential Energy of the package is increased. C. The Kinetic Energy of the package is increased. D. The Kinetic Energy of the package is decreased. E, The Potential Energy of the package does not change.

Please help me with this question:  1. Bob a man with a mass of 90kg, climbs up a 3.5m high tree. a.) How much work must Bob do in order to make it to the top of the tree, assuming that he begins and ends at rest?    Bob now jumps out of the tree and land on the ground.  b.) How fast will he be going just before he hits the ground?   c.) First assume that he forgets to bend his knees. That means that he wil land hard - the cushions on his feet will make him move downward 1.6cm while coming to a stop, but that's it. How much force will he feel from the ground while he stops?    d.) As you can see, that enormous force result in a everely injured Bob. So rewind, and let's assum Bob bends his knees this time. That means that the ground forced is in contact with him while he moves 0.45cm downward. Now how much force will the ground exert on Bob?

... question 8 please thanks../....

Question 8 This graph shows different types of energy for a roller coaster car that starts at the top of a large hill and goes down to its lowest point at 6 s. Energy of a Roller Coaster Car 500 450 400 According to the graph, what is the most likely relationship between height and potential energy? 350 3 300 S 250 200 150 100 50 10 Time (s) - Mechanical Energy ...... Potential Energy Kinetic Energy Your answer: O They are directly related. O They are inversely related. O There is no relationship between the two. O There is not enough information for a conclusion.

1. A constant 15 N horizontal force is applied to a 15 kg cart at rest on a level floor. If friction is negligible, what is the speed of the cart after it has gone 8.0 m? Think and Prepare 1. You are going to use the Work-Energy Theorem for this problem 2. How will you figure out the change in KE of the cart? 3. How will you figure out the work done by the force? Enter to 2 significant figures Speed after 8 m = m/s