Power: In a physical fitness program, a woman who weighs 510 N runs up four flights of stairs in 22 s. Each flight rises 3.1 m. (1 hp = 746 W)(a) What is her total change in potential energy?(b) What was the minimum average power (in watts) that she expended during the 22 s?(c) What horsepower motor would be required to generate the same power?
What will be an ideal response?
(a) 6.3 kJ (b) 290 W (c) 0.39 hp
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One of the dangers of tornados and hurricanes is the rapid drop in air pressure that is associated with such storms. Assume that the air pressure inside of a sealed house is 1.02 atm when a hurricane hits
The hurricane rapidly decreases the external air pressure to 0.910 atm. A square window in an outside wall of the house measures 2.02 m on each side. What net force (directed outwards) is exerted on this window? (1 atm = 1.01 × 105 Pa.) A) 5.37 × 105 N B) 5.14 × 104 N C) 4.53 × 104 N D) 4.78 × 105 N
Any oscillating system for which the net restoring force is directly proportional to the displacement is said to exhibit simple harmonic motion
Indicate whether the statement is true or false
Which of the following web video formats is a common format used by digital video cameras?
A. .avi B. .mov C. .mpeg D. .wmv
In the context of measuring the properties of galaxies, a__________is an object of known brightness that astronomers use to find distance
A) black hole B) white dwarf C) standard candle D) red giant