A 10 kg mass is attached to the end of a 2.00 m brass rod with a 1 mm diameter. If the tensile modulus of brass is 
then the frequency of the simple harmonic motion of the mass is
A. 6.20 Hz.
B. 7.51 Hz.
C. 7.95 Hz.
D. 8.21 Hz.
E. 9.51 Hz.
E. 9.51 Hz.
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A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of 2.25 kg ? m2. If he pulls in his arms so his moment of inertia decreases to 1.80 kg ? m2, what will be his new angular speed?
A) 2.25 rad/s B) 4.60 rad/s C) 6.25 rad/s D) 0.81 rad/s
In the Milky Way, the most abundant gas in emission nebulae is ____.
A. Helium B. Hydrogen C. Neon D. Krypton
Fossils of early life are very difficult to identify in very old rocks because early life
A) was very simple and microscopic in size B) was not made of organic material that could be replaced by minerals C) was so different to life found on Earth today that we are not capable of identifying it D) did not leave behind any fossilized remains
A container with a one-liter capacity at 27° C is filled with helium to a pressure of 2.0 atm. (1 atm = 1.0 × 10^5 N/m2.) How many moles of helium does it hold?
a. 0.041 b. 0.081 c. 0.45 d. 0.90 e. 1.0