Which of the following has the largest amount of gravitational potential energy? A 75 kg person on top of Mt. Everest (8,800 meters). A 5,000 kg elephant on a truck 1.5 meters off the ground. A 0.05 kg bullet traveling at 645 m/s across a field.
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- The Elf on the Shelf has mass 0.500 kg and is sitting on a shelf some height y above the ground. If the gravitational potential energy is 49.0 J, what is y?assume the object has a mass of 0.55kg. calculate the gravitational potential energy and kinetic energy of the object. add the values to get the total energy. don't forget to label the units. time (s) 0.05 height (m) 4.99 speed (M/s) 0.5A 150g book is initially at rest on a table that has no friction. A force of 3.2 N is applied to the book which moves over a distance of 1.2 m. The table is 1.4m high. What is the gravitational potential energy of the book relative to the table?
- Someone drops a 70 – g pebble off of a docked cruise ship, 50.0 m from the water line. A person on a dock 5.0 m from the water line holds out a net to catch the pebble. (a) How much work is done on the pebble by gravity during the drop? (b) What is the change in the gravitational potential energy during the drop? If the gravitational potential energy is zero at the water line, what is the gravitational potential energy (c) when the pebble is dropped? (d) When it reaches the net? What if the gravitational potential energy was 40.0 Joules at water level? (e) Find the answers to the same questions in (c) and (d). |Pilings are driven into the ground at a building site by dropping a 2150 kg object onto them. What change in gravitational potential energy does the object undergo if it is released from rest 20.0 m above the ground and ends up 1.90 m above the ground? change in gravitational potential energy: 318481.65 J IncorrectAn 80000 kg train moving at 20 m/s moves along a track thanks to a steady driving force of 4.5 kN parallel to (along) the track. A frictional force of 5.0 kN brakes the train as it moves. Through what distance does the train move before its speed is reduced to 15 m/s? What is the work (in Joules) done by the driving force? How much energy (in Joules) is expended in friction? What is the change of height along this long stretch of track?
- A 23.0-kg file cabinet of is sliding down a frictionless ramp for a distance of 5.00 m as shown. Use g = 10.0 m/s2. Assuming the system is cabinet+earth+ramp, match the answers with questions. AK + AUg + AUsp + AEth + AECH = Wexternal 5.0 m 15.0° v What is the change in gravitational potential energy (AUg)? (Hint: what is Ay?) A. OJ v What is the change in thermal energy (AE+H)? B. 298 J v What is the change in kinetic energy (AK)? C. -298 J D. -230 J E. 1150 J F. none of the given G.-1150 JA 0.23-kg stone is held 1.1 m above the top edge of a water well and then dropped into it. The well has a depth of 4.6 m. (a) Relative to the configuration with the stone at the top edge of the well, what is the gravitational potential energy of the stone-Earth system before the stone is released? (b) Relative to the configuration with the stone at the top edge of the well, what is the gravitational potential energy of the stone-Earth system when it reaches the bottom of the well? (c) What is the change in gravitational potential energy of the system from release to reaching the bottom of the well?You are meeting your friends at a 49er football game. You start near the top of the seating area (8.9 m above the field) and walk down the steps to where your friends are sitting (3.4 m above the field). Assume that your mass is 60 kg. What is the change in your gravitational potential energy as you walk down the steps? Give your answer in J and report your answer to 1 decimal place. Make sure you include the sign if that is important for your answer.
- What is the gravitational potential energy of a 230 g bird flying 1 km off the surface of the earth?What is the kinetic energy of a 1400 kg car traveling at 5.3 s ? m 7.4 x 10° J 2.0 x 104 J 7.3 x 10 J 2.8 x 107 JA 28 kg object is located 2 meters above the ground. Calculate the object's gravitational potential energy (in Joules) relative to the ground. Your Answer: