How many valence electrons does gallium (Ga, atomic no. = 31) have?
A) 1
B) 6
C) 3
D) 31
E) 70
Answer: C
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In general, the friction forces between one object and another act
A) in the same direction. B) in opposite directions. C) at right angles to each other. D) none of the above
If the wavelength of a photon is the same as the de Broglie wavelength of an electron, which one has the greater momentum?
A) The electron because it has more mass. B) The photon because it is traveling faster. C) They both have the same momentum.
Free Fall: A toy rocket is launched vertically from ground level at time t = 0.00 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 81 m and acquired an upward velocity of 40 m/s. The rocket continues to rise with insignificant air resistance in unpowered flight, reaches maximum height, and falls back to the ground. The upward acceleration of the rocket during the burn phase is closest to
A. 9.9 m/s2. B. 9.6 m/s2. C. 9.3 m/s2. D. 9.0 m/s2. E. 8.7 m/s2.
Scientists believe that large storms on Saturn are:
A) tied to Saturn's rings. B) in the high altitude ammonia clouds. C) only found at the equator. D) rooted deep in the atmosphere. E) in Saturn's troposphere.