When fast electrons strike a metal target, what are produced?
a. Radio waves
b. Gamma rays
c. X-rays
d. Microwaves
c
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A 70-kg swimmer dives horizontally off a 500-kg raft. The diver's speed immediately after leaving the raft is 6.0 m/s. A micro-sensor system attached to the edge of the raft measures the time interval during which the diver applies an impulse to the raft just prior to leaving the raft surface. If the time interval is read as 0.25 s, what is the magnitude of the average horizontal force by diver
on the raft? a. 110 N b. 420 N c. 2 000 N d. 1 700 N e. 24 N
Most of the carbon dioxide on the Earth
A) is dissolved in the oceans, forming carbonate rocks B) has frozen out in the polar regions C) has escaped into space D) is still present in the atmosphere
A star is given a designation of Alpha Draconis and thus apparently it is the _______________ in the constellation
a. brightest b. second brightest c. third brightest d. fourth brightest
The Curiosity rover has detected evidence of what kind(s) of chemical activity in Mars' soil?
A) organic carbon chemistry B) helium and hydrogen C) photosynthesis D) water, sulfur and chlorine-containing minerals E) minerals containing sulfur or produced by reactions with sulfuric acid