A ping-pong ball has an average density of 0.140 g/cm3 and a diameter of 3.80 cm. What force would be required to keep the ball completely submerged under water?
a. 0.484 N
c. 0.516 N
b. 0.242 N
d. 0.258 N
B
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A light ray goes through two thick rectangular slabs of glass, each of the same uniform thickness. The first slab has index of refraction n1 and the second n2 . If n1< n2. How does the original angle of incidence 
into the first slab compare to the final angle of refraction where the ray leaves the second slab going back into air?
A. 
B. 
C. 
D. 
E. more information is needed
Gamma-ray bursters seem scattered randomly over the entire sky
Indicate whether the statement is true or false
Which isotopes are most appropriate for dating formations from the following ages: (a) the early Precambrian; (b) the Mesozoic; (c) the late Pleistocene?
What will be an ideal response?
A high-pressure zone girdles Earth at the 30°N and 30°S latitudes, causing
A) great deserts, such as the Sahara and Arabia Desert in Africa, the Mojave Desert in the United States, and the great Victoria Desert in Australia. B) hot, weak winds in the horse latitudes. C) a belt of hot and dry surface air. D) all of these