Sound: Seven seconds after a brilliant flash of lightning, thunder shakes the house. Approximately how far was the lightning strike from the house?
A. much closer than one kilometer
B. about one kilometer away
C. about two kilometers away
D. much farther away than two kilometers
E. It is impossible to say.
Answer: C
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A force acting on an object moving along the x axis is given by Fx = (14x ? 3.0x2) N where x is in m. How much work is done by this force as the object moves from x = ?1 m to x = +2 m?
a. +12 J b. +28 J c. +40 J d. +42 J e. ?28 J
A spaceship is moving past us at a speed close to the speed of light. What would we conclude about time (clocks) on the spaceship as it goes by?
A) Time is the same for everyone. B) We would conclude that their clocks are going at the same rate as ours. C) We would conclude that their clocks are going exactly half as fast as ours. D) We would conclude that their clocks are going faster than ours. E) We would conclude that their clocks are going slower than ours.
How much heat would be required to melt 1.0 kg of LEAD, initially at room temperature? Assume room temperature to be 20°C
(c = 920 J/kg-C° Lf = 0.25 × 105 J/kg LV = 8.67 × 105 J/kg melts at 328.°C boils at 1744.°C)
The rms speed of a certain sample of carbon dioxide molecules, with a molecular weight of 44 g/mole, is 396 m/s. What is the rms speed of water molecules, with a molecular weight of 18 g/mol, at the same temperature?
A) 253 m/s B) 387 m/s C) 421 m/s D) 506 m/s E) 619 m/s