Which Uranium isotope is the most commonly occurring isotope?
A) U-235
B) U-236
C) U-237
D) U-238
E) U-239
D
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The two stars near one another are shown. Positions of one member are shown relative to the other star at different times. From plots like this one, astronomers conclude that 
a. the stars are in an elliptical orbit around one another.
b. the mass of the pair can be estimated.
c. one star is passing by the other never to return.
d. both the stars are in an elliptical orbit around one another.
Temperature Scales: Oxygen condenses into a liquid at approximately 90 K. What temperature, in degrees Fahrenheit, does this correspond to?
A. -193°F B. -217°F C. -265°F D. -297°F
A large cylindrical water tank is mounted on a platform with its central axis vertical. The water level is 3.75 m above the base of the tank, and base is 6.50 m above the ground
A small hole 2.22 mm in diameter has formed in the base of the tank. Both the hole and the top of the tank are open to the air. We can ignore air resistance and treat water as an ideal fluid with a density of 1000 kg/m3. (a) How many cubic meters of water per second is this tank losing? (b) How fast is the water from the hole moving just as it reaches the ground? What will be an ideal response?
What technique does a radio telescope use to focus incoming light?
A. dispersion B. refraction C. reflection D. diffraction