Noah and nina are 15 m apart in a closed room. noah says the same sentence twice. the first time, nina does not hear the sound, but she does hear the sentence the second time. what best describes the difference between the second sound wave and the first? the second sound wave reflects off the walls of the room, so nina is able to hear the sound. the second sound wave travels faster to nina, so less energy is dissipated through the air. the air molecules in the compressions of the second wave are more dense. the air molecules in the second wave are closer together on average, so they travel faster.

Which statement best describes who the period and frequency of electromagnetic was change between gamma rays and microwaves? a) the period and frequency stay the same. b) the period increases and the frequency decreases. c) the period decreases and the frequency increases. d) the period increases and the frequency increases.

2.22/3.33 points | previous answers tamucolphysmechl1 4.pre.002. ask your teacher my notes question part points submissions used on a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. it strikes a red glider that has mass 0.600 kg and that is initially at rest. after the collision, the blue glider is moving to the left with a speed of 2.40 m/s. (a) what are the magnitude and direction of the velocity of the red glider after the collision? magnitude 3.33 m/s correct: your answer is correct. direction correct: your answer is correct. (b) is this collision elastic?

How do we measure or think of speed in the united states?