On a sunny day does a bird or an aeroplane flying high in the sky casts its shadow on the ground

An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. the company took a random sample of 27 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 2.2 miles per hour. another sample of 18 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 2.5 miles per hour. assume that the speeds at which all men and all women drive cars on this highway are both approximately normally distributed with unknown and unequal population standard deviations.

Explain in physical terms how a microwave oven works. what would happen when you put a conductor in the microwave oven? explain.

What is the speed of an object at a given moment?