A car needs to generate in order to maintain a constant velocity of on a flat road. What is the magnitude of the total resistive force acting on the car (due to friction, air resistance, etc.)? (1 hp = 746 W)
A) 2.05 × 103 N
B) 2.75 N
C) 1.03 × 103 N
D) 2.87 × 103 N
Answer: A
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Time Dilation: You are a passenger on a spaceship. As the speed of the spaceship increases, you will observe
A. your watch slowing down. B. your watch speeding up. C. your watch losing time. D. your watch gaining time. E. nothing unusual about the behavior of your watch.
Isolated quarks were first observed in
A. 1938. B. 1955. C. 1976. D. 2001. E. Isolated quarks have not been observed.
Two waves are described by y1 = 6cos(180t) and y2 = 6cos(186t) (both in meters). With what angular frequency does the maximum amplitude of the resultant wave vary with time?
a. 366 rad/s b. 6 rad/s c. 3 rad/s d. 92 rad/s e. 180 rad/s
A pressure of 3.00 × 10^?7 mm of Hg is achieved in a vacuum system. How many gas molecules are present per liter volume if the temperature is 298 K? (760 mm of Hg = 1 atm, R = 0.082 1 L/atm/mol/K, and NA = 6.02 × 10^23)
a. 6.5E+10 b. 8.6E+16 c. 9.7E+12 d. 1.8E+9 e. 5.7E+14