Air resistance and determine the kinetic energy
A 2kg rock is released from rest at a height of 29m. ignore air resistance and determine the kinetic energy, gravitational potential energy, and total mechanical energy at each of the following heights: 20m; 15m; 5m; 9m.
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A manufacturer claims that the mean amount of juice in its 16 ounce bottles is 16.1 ounces. A consumer advocacy group wants to perform a hypothesis test to determine whether the mean amount is actually less than this. The mean volume of juice
A bat emits a sound whose frequency is 96 kHz. The speed of sound in air at 20.0° C is 343 m/s. However, the air temperature is 35° C, so the speed of sound is not 343 m/s. Assume that air behaves like an ideal gas, and find the wavelength
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A 225-kg crate is pushed horizontally with a force of 685 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate.
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A 51.0kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 250N . For the first 10.5m the floor is frictionless, and for the next 10.5m the coefficient of friction is 0.18. What is the final speed of the crate
A whistle of frequency 650 Hz moves in a circle of radius 69.0 cm at an angular speed of 12.0 rad/s. Use 343 m/s for the speed of sound in air. What are the lowest and the highest frequencies heard by a listener a long distance away, at rest with
A refrigerator with a coefficient of performance of 1.99 absorbs 3.96×10^4 J of heat from the low-temperature reservoir during each cycle.
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As Molly reviews the grade they scored in their final exams, they think, "I did well on this exam, because my roommate helped me study."
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