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
The water flows through a 3-inch inside diameter tube at 40 lb/second. Starting with the general energy balance. Determine the power that is required by the pump in hp?
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.
Starting with the general energy balance and explaining what terms are zero or cancel, determine the power in kW needed.
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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You are a social worker working with foster children. You are making a home visit to Katie, age nine, and her foster family.
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