Two equal point charges Q are separated by a distance d. One of the charges is released and moves away from the other due only to the electrical force between them
When the moving charge is a distance 3d from the other charge, what is its kinetic energy?
Q2/6? ?0d
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Which of the following quantities are conserved in an isolated system?
a. mass b. energy c. momentum d. all of the above
A condenser for a large refrigerator is a four-shell-eight-tube-pass heat exchanger. The condensing fluid is ammonia at 40ºC and the overall heat transfer coefficient is 500 W/m^2?K. 10 kg/s of water at 5ºC, heated to 30ºC, is used to cool the ammonia. Determine the mass flow of ammonia if its heat of vaporization is 1102 kJ/kg and then determine the surface area of the heat exchanger.
What will be an ideal response?
How would we view time (clocks) on the spaceship as it goes by?
A) Time is the same for everyone. B) Their clocks are going at the same rate as ours. C) Their clocks are going exactly half as fast as ours. D) Their clocks are going faster than ours. E) Their clocks are going slower than ours.
The last page of a book is numbered 764. The book is 3.0 cm thick. What is the average thickness of a sheet of paper in the book, in centimeters?
A) 0.0039 B) 0.0078 C) 127.3 D) 0.072 E) 254.7