In a radioactive decay,
u are converted into kinetic energy. How much kinetic energy is this? 
A. 
B. 
C. 
D. 
E. 
C.
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Coulomb's Law: As shown in the figure, three charges are at corners of a rectangle. The charge in the bottom right corner is Q = - 90 nC, and all the other quantities are accurate to two significant figures. What is the magnitude of the net electrical force on Q due to the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2) 
A. 3.8 × 10-2 N B. 2.8 × 10-2 N C. 5.3 × 10-2 N D. 7.1 × 10-2 N
The Galileo spacecraft dropped a probe into Jupiter's atmosphere that survived to a depth of about 200 kilometers, or 0.3% of Jupiter's radius. Which is the deepest layer in which this probe was able to make measurements?
A) the gaseous hydrogen layer B) the liquid hydrogen layer C) the metallic hydrogen layer D) the core
What is the sign of these fields’ curl component at point P on each diagram in the direction facing us? (Hint: Draw a cross-sectional view of a small curl-meter centered on the point in question, and sketch the magnetic field vectors at the midpoint of each of the curl-meter’s four sides in the drawing’s plane. Don’t worry about how we might create such a magnetic field.)
A. The component of the curl in this direction is positive.
B. The component of the curl in this direction is negative.
C. The component of the curl in this direction is zero.
How do comets differ from asteroids?
a. They are mostly rock, not ices. b. Their orbits are usually much farther from the Sun. c. They are leftover pieces of a smashed planet. d. All of the above.