A roller coaster (432 kg) moves from A (9.32 m above the ground) to B (21.9 m above the ground). Two non-conservative forces are present: friction does -1.42×104 J of work on the car, and a chain mechanism does +5.85×104 J of work to help the car up a long climb. What is the change in the car's kinetic energy KEf − KEo from A to B? Number Units
In an RLC circuit such as that of the figure assume that R = 6.19 Ω, L = 58.8 mH, fd = 80.1 Hz, and εm = 43.8 V. For what values of the capacitance would the average rate at which energy is dissipated in the resistance be (a) a maximum and (b) a minimum? What are (c) the maximum dissipation rate and the corresponding (d) phase angle and (e) power factor? What are (f) the minimum dissipation rate and the corresponding (g) phase angle and (h) power factor? (a) Number Units (b) Number Units (c) Number Units (d) Number Units (e) Number Units (f) Number Units (g) Number Units (h) Number Units
Suppose the maximum distance you can throw a particular ball on Earth is 51.0 m. When you travel to another planet, the maximum distance for the same ball is 36.5 m. Part A If the planet is the same size as Earth, what is its mass? Express your answer with the appropriate units. mplanet = Value Units Submit Request Answer