Ball rolling along a floor
A ball rolling along a floor doesn't continue rolling indefinitely. Is it because it is seeking a place of rest or because some force is acting upon it? If the latter, identify the force.
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An inventor claims to have developed a food freezer that at a steady state requires a power input of .5 kW to extract energy by heat transfer at a rate of 3000 J/s from freezer contents at 270 K.
The average sodium content per packet of a certain brand of soup in a cup is 780 milligrams and the standard deviation is 45 milligrams. Assume that the sodium content in this variety of soup in a cup is normally distributed.
The total race is fifty meters long. If the total race is run in 6.32 s, How far does he run during the acceleration phase?
How long would it take (in seconds) to deposit 1.97 g of copper from an aqueous solution of copper(II) sulfate by passing a current of 2.44 amperes through the solution?
A random sample of 25 items had a mean wholesale price of 165.2 and a standard deviation of s = 29.5. What is s of the retail price of those items? Give answers to 2 decimal places.
If these two runners had run in the same race, each running the entire race at the average speed that earned him a place in the record books, el-Guerrouj would have won. By how many meters?
If 876 coulombs of electricity is used to reduce Cr3+ to Cr (s), how many grams of chromium will be deposited at the cathode?
What phase difference between two otherwise identical traveling waves, moving in the same direction along a stretched string, will result in the combined wave having an amplitude 0.72 times that of the common amplitude of the two combining waves?
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