How small are Hydrogen atoms?
A.) 10^-7 m.
B.) 10^-8 m.
C.) 10^-9 m.
D.) 10^-10 m.
E.) 10^-11 m.
Ans: C.) 10^-9 m.
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A spaceship is moving past us at a speed close to the speed of light. What would we conclude about time (clocks) on the spaceship as it goes by?
A) Time is the same for everyone. B) We would conclude that their clocks are going at the same rate as ours. C) We would conclude that their clocks are going exactly half as fast as ours. D) We would conclude that their clocks are going faster than ours. E) We would conclude that their clocks are going slower than ours.
Despite being only a medium-size moon, Enceladus may have subsurface habitable zones
Indicate whether the statement is true or false
When we say that Jupiter is at opposition we mean that it
A) is behind the Sun as seen from Earth, so that it appears very close to the Sun in our sky. B) is at its greatest western elongation. C) it is at the point in its orbit where it is farthest from the Sun. D) appears on the opposite side of the sky from the Sun, so that it is on our meridian at midnight.
The zirconium nucleus contains 40 protons, and an electron is 1.0 nm from the nucleus. What is the electric force on the electron due to the nucleus? ( e = 1.60 × 10-19 C, k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 2.9 nN B) 1000 C C) 3.7 nN D) 6.8 nN E) 9.2 nN