A sphere of radius 25 cm is at the bottom of a pool containing fresh water. If the total force on the sphere due to the water is 1025 N, what is the depth of the sphere below the surface? The air pressure outside is 101.5 kPa.
A. 7.6 m
B. 5.7 m
C. 52.8 m
D. 13.2 m
E. 2.9 m
F. 39.6 m
E. 2.9 m
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In the hypothetical atomic interaction shown in figure C9.13, suppose that initially the system’s kinetic energy is 
at an initial separation of 0.1 nm. About how much energy would we have to add to the system for the atoms to fly off to infinite separation?
A. 1 × 10-21 J B. 6 × 10-21 J C. 11 × 10-21 J D. 16 × 10-21 J E. None. The atoms will do so without adding energy.
The Crab Nebula is a bright, long lasting supernova remnant that was made by a ________ supernova
Fill in the blank(s) with correct word
A boat travels upstream and after one hour has gone 10 km. The boat next travels downstream and after one hour has gone 18 km. If the boat's speed relative to the water is constant, what is the speed of the current in the river?
a. 3 km/h b. 4 km/h c. 5 km/h d. 6 km/h e. 7 km/h
What observational evidence supports the galactic fountain model (which describes how gas cycles between the disk of the galaxy and regions high above the disk)?
A) We have discovered a jet of ionized gas shooting out of the bulge of our galaxy. B) We have discovered that the entire galactic disk is being uniformly "rained on" by cool gas coming from the halo. C) We see hot gas high above the region of the disk near our solar system, along with cool gas that appears to be raining down from the halo. D) We have observed a lot of water molecules in the interstellar medium.