Please help me out! This is a big question! True or false?
Because of the Doppler effect, as an observer and source move closer the pitch of the sound from the source gets higher; if the observer and source are moving farther apart the pitch will sound lower to the observer.

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.

He sandals were out in the sun so the got hotter. which is why her feet felt hot.

Answer (d) the universe had cooled enough for atoms to combine, protons and neutrons were too far apart to form nuclei;