A bullet is fired straight down from a hovering helicopter. If we neglect air friction, then the speed of the bullet
A. increases at 9.8 m/s each second.
B. decreases at 9.8 ft/s during the flight.
C. is a constant.
D. is zero.
Answer: A
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A 2.00 kg piece of lead at 40.0°C is placed in a very large quantity of water at 10.0°C, and thermal equilibrium is eventually reached. Calculate the TOTAL change in entropy that occurs during this process. The specific heat of lead is 130 J/(kg ? K)
A) 190 J/K B) 100 J/K C) 6.6 J/K D) 6.2 J/K E) 1.4 J/K
Consider the star to which the arrow points. Which of the following statements about this star is not true?
A) Its surface temperature is lower than the Sun's. B) Its core temperature is higher than the Sun's. C) It is larger in radius than the Sun. D) It is brighter than the Sun. E) It is significantly less massive than the Sun.
Within the frost line, planetesimals were composed entirely of rock, and outside the frost line, planetesimals were composed entirely of ice
Indicate whether the statement is true or false
Sound waves in water have a higher ________ than sound waves in air.
Fill in the blank(s) with the appropriate word(s).