Most photosynthesis takes place
a)when animals breathe.
b)in tropical forests.
c)in the oceans.
d)in the atmosphere.
c
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A light wave traveling in air strikes a plane mirror surface at an angle of 30° relative to the normal. The wave is reflected at an angle of
a. 30° relative to the surface. b. 30° relative to the normal. c. 60° relative to the normal. d. none of these.
In choosing between sound waves and radio waves, which has the greater speed?
A) sound wave B) radio wave C) both the same D) need more information
Suppose we look at a photograph of many galaxies. Assuming that all galaxies formed at about the same time, which galaxy in the picture is the youngest?
A) the one that is farthest away B) the one that is reddest in color C) the one that is bluest in color D) the one that is closest to us E) the one that appears smallest in size
A child does 350 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tree house is 4m above the ground. What is the mass of the box?
A) 8.9 kg B) 8.0 kg C) 5.3 kg D) 6.7 kg