What is the most common form of gas in the interstellar medium?
A) ionized hydrogen
B) molecular hydrogen
C) atomic helium
D) atomic hydrogen
E) molecular helium
D
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A hair dryer draws 1500 W, a curling iron draws 800 W, and an electric light fixture draws 500 W. If all three of these appliances are operating in parallel on a 120 V circuit, what is the total current drawn?
a. 23.3 A c. 36.7 A b. 20.8 A d. 19.4 A
The position x, in meters, of an object is given by the equation x = A + Bt + Ct2, where t represents time in seconds. What are the SI units of A, B, and C?
A) m, s, s2 B) m/s, m/s2, m/s3 C) m, s, s D) m, m, m E) m, m/s, m/s2
What is the average translational kinetic energy of an ideal gas at 819K The Boltzmann constant is 1.38 × 10-23 J/K
A) 1.70 x 10-20 J B) 5.65 x 10-21 J C) 1.13 x 10-17 J D) 3.77 x 10-19 J
A spring (k = 600 N/m) is placed in a vertical position with its lower end supported by a horizontal surface. The upper end is depressed 20 cm, and a 4.0-kg block is placed on top of the depressed spring. The system is then released from rest. How far above the point of release will the block rise?
a. 46 cm b. 36 cm c. 41 cm d. 31 cm e. 20 cm