Inductive reactance XL is given by
a. L?
b. L/?
c. 1/L?
d. ?/L
e. ?2L
a
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In the late 1800s, Kelvin and Helmholtz suggested that the Sun stayed hot because of gravitational contraction. What was the major drawback to this idea?
A) It predicted that the Sun could shine for about 25 million years, but geologists had already found that Earth is much older than this. B) It predicted that the Sun would shrink noticeably as we watched it, but the Sun appears to be stable in size. C) It is physically impossible to generate heat simply by making a star shrink in size. D) It predicted that Earth would also shrink in size with time, which would make it impossible to have stable geology on our planet.
Why do we think Mars had more volcanic activity in the past than it does today?
a. Mars was bombarded with more impacts in the past, which fueled more volcanic activity. b. Mars’ interior would have been warmer in the past. c. Some meteorites from Mars come from relatively young lava. d. All of the above. e. b and c.
All asteroids are spherical solid objects, similar to the Moon and Mercury, just much smaller
Indicate whether the statement is true or false
A 100-kg person sits on a 5-kg bicycle. The total weight is borne equally by the two wheels of the bicycle. The tires are 2.0 cm wide and are inflated to a gauge pressure of 8.0 × 105 Pa. What length of each tire is in contact with the ground?
A) 1.6 cm B) 1.8 cm C) 3.2 cm D) 2.4 cm E) 6.4 cm