Why does the sound of something moving away from you seem to change to a lower and lower pitch? a) as the source moves away, the increased distance creates more interference; so the pitch drops. b) as the source moves away, the frequency of the sound waves is being compressed, so the pitch drops. c) as the source moves away, the sound waves speed up to reach the observer; this causes the pitch to drop. d) as the source moves away, the sound waves stretches out relative to the person standing still; so the pitch drops.

The simple interest on a loan of $200 at 10 percent interest per year is $10 per year until the loan is paid off. $15 per year until the loan is paid off. $20 per year until the loan is paid off. $25 per year until the loan is paid off.

An electric current in a wire will push or pull on a permanent magnet. which statement best explains how an electric current creates an electromagnetic force on another magnet?

According to newton's second law, when the same force is applied to two objects of different masses, a the object with greater mass will experience a great acceleration, and the object with less mass will experience an even greater acceleration, b. the object with greater mass will experience a smaller acceleration, and the object with less mass will experience a greater acceleration, c. the object with greater mass will experience a greater acceleration, and the object with less mass will experience a smaller acceleration, d. the object with greater mass will experience a small acceleration, and the object with less mass will experience an even smaller acceleration.