The massive ram of a pile driver falling from rest strikes a pile with a speed that depends on the
A) initial height of the ram.
B) initial potential energy of the ram.
C) distance the ram falls.
D) all of the above
Answer: D
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Consider the cooling of (a) a personal computer with a separate CPU, and (b) a laptop computer. The reliable functioning of these machines depends upon their effective cooling. Identify and briefly explain all modes of heat transfer that are involved in the cooling process.
GIVEN - A personal computer with a separate CPU (the monitor, keyboard, and mouse are separate and not considered). - A laptop computer. FIND Identify and describe modes of heat transfer involved in their cooling. ASSUMPTIONS - The computers are turned on and in normal operation.
Which will stay cooler for a longer time in a picnic cooler on a hot summer day?
A) sandwiches B) salami C) Jello
A wheel is rotated about a horizontal axle at a constant angular rate. Next, it is rotated in the opposite direction with the same angular rate. The acceleration at a point on the top of the wheel in the second case as compared to the acceleration in the first case:
a. is in the same direction. c. is upward. b. is in the opposite direction. d. is tangential to the wheel.
A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day. The heat of combustion of coal is 3.3 × 107 J/kg
The steam that drives the turbines is at a temperature of 300°C, and the exhaust water is at 37°C. (a) What is the overall efficiency of the plant for generating electric power? (b) What is the Carnot efficiency? (c) How much thermal energy is exhausted each day?