A race car makes one lap around a track of radius 180 m in 90.0 s. What is the centripetal acceleration in m/s2?

Answer///air resistance,drag;

Question 1 answer: make sure you eat healthy foods and excercise atleast once a day.question 2 answer: sometimes bullying . bullying lowers a persons self-esteem sometimes which can make them not care for themselves to much making them feel bad about there body structer. that or they just have a bad body structer and there family/doctor said its unhealthy how they eat.

An em wave does not require a medium, while a mechanical wave does. 

The correct answer for the first question is a. because if cold air is denser then the warm air will be pushed out of the way. the coreect answer for the 2nd question is a.