A stunt plane turns off its motor and begins hurtling towards the earth. Every second, the pilot releases a puff of smoke for the audience to see. Neglecting air resistance as the plane falls, what does the audience notice about the puffs of smoke?

A)

The puffs of smoke are separated by random distances as the plane falls.

B)

The puffs of smoke have the same distance between them as the plane

falls.

The puffs of smoke have less and less distance between them as the plane

falls

D)

The puffs of smoke have more and more distance between them as the

plane falls

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.

A58-kg boy swings a baseball bat, which causes a 0.140-kg baseball to move toward third base with a velocity of 38.0 m/s.