The variation in the pressure of helium gas, measured from its equilibrium value, is given by DP = 2.9 × 10^-5 cos (6.20x - 3 000t) where x and t have units m and s. Determine the speed (in m/s) of the wave
a. 1 515
b. 153
c. 484
d. 828
e. 101
C
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The Physical Activity Guidelines for Americans specify that people need to spend at least _____ minutes performing moderate-intensity aerobic activity on five to seven days per week.
a. ?60 b. ?20? c. 30 d. 45? e. ?75
Wave Characteristics: Which one of the following is not an electromagnetic wave?
A. ultraviolet B. infrared C. radio waves D. sound waves E. gamma rays
Heat flows into a gas in a piston and the gas performs some work on its surroundings. The amount of work done is less than the heat added. In this situation,
A. the internal energy of the gas did not change. B. the gas experienced a phase change. C. the internal energy of the gas decreased. D. the internal energy of the gas increased. E. energy is not conserved and so it cannot happen.
A batter hits a foul ball. The 0.140-kg baseball that was approaching him at 40.0 m/s leaves the bat at 30.0 m/s in a direction perpendicular to the line between the batter and the pitcher
What is the magnitude of the impulse delivered to the baseball? A) 9.80 Ns B) 1.40 Ns C) 3.50 Ns D) 5.60 Ns E) 7.00 Ns