Answer:
very low air pressure and that's not 100 points
The correct option is: (c) They remain in Phase
Two waves <span>are </span>coherent if the following three conditions are met:
1) They<span> have </span><span>the same frequency.
2) They have the same waveform.
3) They remain in phase.
Hence the correct option is C.</span>
change in momentum of car is given as

here we have

given that
m = 2000 kg


now we have


To solve this problem it is necessary to apply the concepts related to the Rotational Force described from the equilibrium and Newton's second law.
When there is equilibrium, the Force generated by the tension is equivalent to the Force of the Weight. However in rotation, the Weight must be equivalent to the Centrifugal Force and the tension, in other words:

Where
Angular velocity is equal to the Period, at this case Earth's period
Radius of the Earth
m = mass
= Force of Tension
Newton's second law
Replacing and re-arrange to find the Tension we have,






Therefore when Sneezy is on the equator he is in a circular orbit with a Force of tension of 503.26N