According to the "energy valley" of the mass-per-nucleon versus atomic-number graph, the element with the least mass per nucleon is
A) hydrogen.
B) helium.
C) iron.
D) uranium.
E) none of the above
Answer: C
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An electron moves with a speed of 5.0 × 104 m/s perpendicular to a uniform magnetic field of magnitude 0.20 T. What is the magnitude of the magnetic force on the electron? (e = 1.60 × 10-19 C)
A) 2.6 × 10-24 N B) 5 × 10-20 N C) 4.4 × 10-14 N D) 1.6 × 10-15 N E) zero
The radius of Earth is about __________ mi
a. 6000 b. 8000 c. 4000 d. 2000
You throw a ball up in the air and hold your hand under it to catch it when it comes down. The reason why the ball stops is because
a. your hand is there: your hand exerts no force on the ball. b. your hand exerts a force on the ball perpendicular to its velocity. c. your hand exerts a force on the ball in the direction of its velocity. d. your hand exerts a force on the ball in the direction opposite to its velocity. e. your hand and the ball exert forces in the same direction on each other.
Which best describes the surface of Callisto?
a. dark and dirty ice, heavily pocked with craters b. old and dark on some portion, but cratered with a young bright grooved terrain c. icy crust free of craters with a liquid water ocean beneath d. covered in active sulfur-based volcanoes e. mostly water ice mixed with methane