The north pole of a strong magnet is dragged down an iron nail from the top to the point 50 times. what will most likely happen when the nail is brought near a pile of small paper clips?

a. the nail will not pick up any paper clips because its domains are not aligned.
b. the nail will not pick up any paper clips because its domains have been aligned.
c. the nail will pick up some paper clips because its domains are not aligned.
d. the nail will pick up some paper clips because its domains have been aligned.

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 vector addition, triangle method and parallelogram method

What is the angular momentum of the bar about the axle?