The figure shows a sound wave as a function of time when the source is stationary with respect to the observer. An Illustration of a transverse wave and four crests and four troughs are labeled 1 s total.
Which shows the perceived sound wave heard by a stationary observer when the source moves toward the observer?

An illustration of a transverse wave and three crests and three troughs are labeled 1 s total.
An Illustration of a transverse wave that is taller than the previous. Three crests and three troughs are labeled 1 s total.
An Illustration of a transverse wave and four crests and four troughs are labeled 1 s total.
An Illustration of a transverse wave and seven crests and seven troughs are labeled 1 s total.

How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a.the kinetic energy increases.b.the kinetic energy decreases.c.the kinetic energy remains the same.d.the kinetic energy is always zero.

10 points! will mark brainiest! in a heat engine if 1,000 j of heat enters the system and the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2,000 j 1: write the equation2: list out your known variables 3: plug the numbers into the equations 4: solve 5: write your solution statement that includes initial energy and final energy added you so much!

You are a researcher for a golf club manufacturer. you are given two identical looking cubes of a metal alloy. you are informed that they are made of the exact same material, but one is crystalline, whereas the other is amorphous. it is your job to determine which one is amorphous this one is more stress-resistant and is useful in reinforcing golf clubs. which of the following is the best way to determine which is which? a. determine the density of each cube. the more dense one is the amorphous solid. b. melt both cubes and look for a broader range of melting temperatures. the one that melts over a broader range of temperatures is the amorphous solid. c. determine the density of each cube. the less dense cube is the amorphous solid. d. melt both cubes and measure the range of melting temperatures. the one that melts over a narrower range of temperatures is the amorphous solid.