A megaton explosion releases
How much mass is converted into energy in this process?
A. none, if it a result of a chemical reaction
B. none, since mass is conserved
C. 50 kg
D. 50 g
E. 
D. 50 g
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The Local Group of galaxies spans about 30 million light-years in diameter
Indicate whether the statement is true or false
A sound wave coming from a tuba has a wavelength of 0.674 m and travels to your ears at a speed of 345 m/s. What is the frequency of the sound you hear?
a. 512 Hz c. 230 Hz b. 1/517 Hz d. 1/230 Hz
Blackbody radiation is caused by an object's ____
a. chemical structure b. binding energy c. excitation level d. absolute zero e. thermal agitation
A very thin horizontal, 2.00-m long, 5.00-kg uniform beam that lies along the east-west direction is acted on by two forces
At the east end of the beam, a 200-N force pushes downward. At the west end of the beam, a 200-N force pushes upward. What is the angular acceleration of the beam? A) 240 rad/s2 north B) 1.33 × 102 rad/s2 north C) zero D) 240 rad/s2 south E) 1.33 × 102 rad/s2 south