1200 kg roller coaster car starts at point A, then travels 165 ft at 40.0° below the horizontal to point B. a) Taking point B to be the level where the gravitational potential energy of the car-Earth system is zero, what is the potential energy (in J) of the system when the car is at points A and B, and the change in potential energy (in J) as the coaster moves between these points? at point A at point B change in potential energy X Use the equation for gravitational potential energy, U = mgy, where y is the vertical distance from the zero level for potential energy, which in this case is point B. Be sure to convert from ft to m. J change in potential energy J J b) Repeat part (a), setting the zero configuration with the car at point A. at point A at point B J x Use the equation for gravitational potential energy, U = mgy, where y is the vertical distance from the zero level for gravitational potential energy, which in this case is point A. J

A 1.90 kg book is sliding along a rough horizontal surface. At point A it is moving at 3.24 m/s, and at point B it has slowed to 1.30 m/s. a)How much work was done on the book between A and B? b) If -0.740 J of work is done on the book from B to C, how fast is it moving at point C? c)How fast would it be moving at C if 0.740 J of work were done on it from B to C?

un 10 A 2,500-kilogram roller coaster car travels along the track from Point 1 to Point 6 as shown in the image, losing 44,000 joules of energy at a steady rate. The height of the car at Point 1 is 30.00 meters. If Point 3 is halfway between Points 1 and 6 in distance along the track, what is the sum of the car's potential and kinetic energies at Point 3? Select one: 691,000 J. 700,500 J. 775,500 J. 713,000 J. Image Source: WGBH Max: 2,300 g High 200 0 O Thermal megy point to pin 44,000 Sum of EE and PE O

A 2kg package is moves up along a 10 m ramp AC inclined at 15' with an initial speed of 5 m/s. Knowing that the coefficient of sliding friction between the package and the incline is 0.2, answer the following questions: 10 m B 15° d 1. What force/s do/does NOT do any work on the package as it moves along the incline? 2. What is the work done by friction on the package as it moves a distance x along the incline? 3. What is the change in the kinetic energy from A to B if at position the package becomes zero? 4. What is the change in the potential energy from A to B if at position B the velocity of the package 5. What is the maximum distance that the package will move up the incline?

Part 2: Example potential energy questions 1. A bar weighing 550 g is raised 3.0 m off the ground. What is its potential energy? 550 grams = 0.55 kg %3D P Type here to search acer TravelMate B F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 PrtSc NumLk Scr Lk SysRq

A box m = 89 kg is being pulled by a constant force F = 116 N at an angle of θ = 21 degrees. The initial speed of the box is zero 1) Write an expression for the work done by force F as the block moves a horizontal distance d.  2) How much work, in joules, was done in moving the block 5.9 m?  3) What is the speed of the box at d = 5.9 m if the surface is frictionless?

7. The work done by gravity in lowering a 3.0 [kg] box from an initial height to the ground is 15 [J]. What is the gravitational potential energy at its initial position if the potential energy at the ground is zero? A. zero B. -15.0 [J] C. +15.0 [J] D. +30.0 [J]

Constructed Response 1 Jim is lying on his back on the ground throwing a ball in the air and catching it. There is a balcony 10 meters above his head onto which he is trying to land the ball. On his last throw the ball lands on the balcony. The graph below shows the potential and kinetic energy of the ball from when it left Jim's hand to when it landed on the balcony. ★ Graivational Potential energy A Kinetic energy 200 180 160 140 120 100 80 60 40 20 0. 0. 4 9. 10 Height (m) 8. 2. Energy (J)

Pete the 20 [kg] penguin slides down a rough slope passing through two checkpoints that are both equipped to read his total energy. At point 1 his total energy is 250 [J] and point 2 his total energy is 160 [J]. If point 1 is 0.8 [m] above point 2 and he has speeds of 3 [m/s] and 4 [m/s] through points 1 and 2 respectively, how much work is done by the non-conservative forces in this system?

A 10.0 kg coconut is positioned on top of the roof of a house that has a height of 5.00 m and is located on the edge of a cliff that is 20.0 m high. Determine the gravitational potential energy of the coconut relative to the following positions