Glass in a florist's greenhouse acts as a one-way valve by
A) blocking the flow of light energy.
B) blocking unwanted radiation.
C) being transparent only to lower-frequency waves.
D) allowing high-frequency waves to enter and blocking low-frequency waves from exiting.
Answer: D
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A motorist travels for 3.0 h at 80 km/h and 4.0 h at 60 km/h. What is her average speed for the trip?
A) 74 km/h B) 140 km/h C) 70 km/h D) 73 km/h E) 69 km/h
Passing arsenic contaminated water through a long pipe filled with sand and iron powder leads to removal of the arsenic by
A) a physical change. B) an oxidation-reduction reaction. C) ion exchange. D) filtering out the suspended arsenic particles. E) only a and b
According to the nebular theory, what are asteroids and comets?
A) They are the shattered remains of collisions between planets. B) They are the shattered remains of collisions between moons. C) They are leftover planetesimals that never accreted into planets. D) They are chunks of rock or ice that condensed long after the planets and moons had formed. E) They are chunks of rock or ice that were expelled from planets by volcanoes.
A 60.0 W light bulb radiates light uniformly in all different directions. What is the value of E at a distance of 0.400 m from the bulb?
A) 162 N/C B) 212 N/C C) 82.1 N/C D) 106 N/C E) 52.9 N/C