EM waves in a vacuum travel at a speed
a. of c.
b. varying with their wavelength.
c. varying with their intensity.
d. of 299,792,458 m/s.
a, d
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After the first solid grains formed in our solar system, these particles could then grow by the process of ____, the collision and sticking of one particle with another to continue the formation of planetesimals. Each of these has many atoms or molecules
a. Accretion b. Sublimation c. Hydration d. Condensation e. Vaporization
Iron meteorites are believed to come from:
A) the core of a dense M-type asteroid, now broken up. B) Mars, hence their reddish color. C) the crust of a differentiated type C asteroid, now broken up. D) a broken up cometary nucleus, hence their shiny appearance. E) deep space, far beyond the solar system, hence their unique crystal patterns.
The 1 560 kg solid steel door to a bank vault is 2.00 m high, 1.00 m wide and 10 cm thick. One hinge is 60.0 cm down from the top on the left hand side of the door. The other hinge is 30.0 cm up from the bottom. What horizontal force, in what direction, does the door exert on the lower hinge?
a. 6 950 N, left b. 6 950 N, right c. 7 640 N, left d. 7 640 N, right e. 15 300 N, left
In one word, how can water in the power plant of a nuclear submarine far exceed 100°C?
A) conductivity B) evaporation C) condensation D) pressure E) vaporization