You throw a rock horizontally off a cliff with a speed of 20 m/s and no significant air resistance. After 2.0 s, the magnitude of the velocity of the rock is closest to
A) 28 m/s
B) 20 m/s
C) 40 m/s
D) 37 m/s
A
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On average, the Milky Way forms about ________ stars per year
Fill in the blank(s) with correct word
A stretched string is observed to vibrate in three equal segments when driven by a 480 Hz oscillator. What is the fundamental frequency of vibration for this string?
a. 480 Hz b. 320 Hz c. 160 Hz d. 640 Hz e. 240 Hz
A glacier grows and shrinks with the seasons. When a glacier is growing, we say it is
A) retreating. B) advancing. C) stationary. D) crevassing.
A monatomic ideal gas undergoes an isothermal expansion at 300 K, as the volume increased from 0.03 m3 to 0.21 m3. The final pressure of the gas is 60 kPA The ideal gas constant is R = 8.314 J/mol ? K
The change in the internal (thermal) energy of the gas is closest to A) 0.00 kJ. B) 12 kJ. C) 25 kJ. D) -12 kJ. E) -25 kJ.