A 1.50 kg hollow steel ball is submerged in water. It weighs in water 10.75 N. The volume of the cavity inside the ball is (density of steel is 
A. 0.000139 
B. 0.000213
C. 0.000348
D. 0.000401
E. 0.000476
B. 0.000213
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What is the period of a signal that has a frequency of 60 Hz?
a. 60 s c. 1/60 s b. 60 s-1 d. not determinable
Why are stars no longer forming in the galactic halo?
A) Frequent supernovae blew all the halo gas out into intergalactic space. B) There was never star formation in the halo; its stars were ejected from the disk. C) Only low-mass stars formed in the halo, so there were no stellar winds or supernovae to recycle gas. D) The cold molecular gas required for star formation is in the galactic disk.
2.20 kilograms of water at 1.00 atm at the boiling point of 100°C is heated until all the water vaporizes. What is its change in entropy? (For water, Lv = 2.26 × 10^6 J/kg)
a. 2.67E+4 J/K b. 1.33E+4 J/K c. 6.66E+3 J/K d. 4.44E+3 J/K e. 1.82E+4 J/K
A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going upwards the velocity and acceleration both point up
Indicate whether the statement is true or false