The size of the volcanoes on Mars indicate that Mars has a(n) ____________________ crust than Earth
Fill in the blank(s) with correct word
thicker
stronger
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What is the equivalent resistance between points a and b when R = 30 ??
a.
27 ?
b.
21 ?
c.
24 ?
d.
18 ?
e.
7.5 ?
Which gases in Earth's atmosphere strongly absorb ultraviolet radiation?
A. water vapor and carbon dioxide B. ozone and oxygen C. nitrogen and argon D. None of these choices are correct.
Snell's Law: A narrow light beam in vacuum contains light of two wavelengths, 480 nm and 700 nm. It strikes a flat piece of glass at an angle of incidence of 60.000°. The index of refraction of the glass is 1.4830 at 480 nm and 1.4760 at 700 nm. Determine the angle between the two wavelengths as the light travels in the glass.
Fill in the blank(s) with the appropriate word(s).
Our best measurements from Earth indicate that the star system Alpha Centauri is 4.2 light-years away. Suppose some of our astronauts traveled there at a speed v = 0.90c. What would the astronauts measure as the distance to Alpha Centauri?
a. 1.3 lightyears c. 1.8 lightyears b. 4.0 lightyears d. 2.7 lightyears