How did Mars get its two moons?
a. Mars captured asteroids from the asteroid belt
b. Mars suffered a catastrophic meteor impact, breaking a piece off the planet.
c. Mars had planetary bodies near it when the solar wind blew out the nebula.
d. Mars collided and fused with another planet leaving two remnants behind.
e. Mars captured comets from the Kuiper belt.
a
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Parallel-Plate Capacitor: A tiny 0.0250-µg oil drop containing 15 excess electrons is suspended between two horizontally closely-spaced metal plates that carry equal but opposite charges on their facing surfaces. The plates are both circular with a radius of 6.50 cm. (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C)(a) How much excess charge must be on each plate to hold the oil drop steady?(b) Which plate must be positive, the upper one or the lower one?
What will be an ideal response?
Energy in Nuclear Reactions: Consider the nuclear reaction: 7Li + 1p ? 4He + 4He. The known atomic masses are7Li: 7.016005 u
He: 4.002603 u1p: 1.007825 uWhat is the Q-value (or reaction energy) of this reaction? (1 u = 931.5 MeV/c2)
A. 13.57 MeV B. 15.37 MeV C. 17.35 MeV D. 17.53 MeV
A 1.2-kg mass is projected down a rough circular track (radius = 2.0 m) as shown. The speed of the mass at point A is 3.2 m/s, and at point B, it is 6.0 m/s. What is the change in mechanical energy done on the system between A and B by the force of friction?
a.
?8.9 J
b.
?7.3 J
c.
?8.1 J
d.
?6.6 J
e.
?24 J
Which of the following metals is least likely to be suitable for wire drawing?
(a) Magnesium (b) Aluminum (c) Copper (d) Iron