In which situation are waves transmitted? A. A curtain blocks light from a window.
B. A camp fire lights up a cave.
C. Leaves look green in sunlight.
D. Ice cream melts on a hot day.
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Aplane travels 1000 miles in 5 hours .what is the planes average speed?

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?

The items in the following list are all units of matter. which is the smallest unit that retains the properties of the matter? a.) atom b.) compound c.) electron d.) element