. A particle of mass m moves with a constant acceleration a. If the initial position vector and velocity of the parti cle are r, and v, respectively, use energy argument to show that its speed wy at any time satisfies the equation w = w '+ 2a- (-)

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.

Which statement correctly describes the interaction between magnetic poles? north and south poles attract each other. north and south poles repel each other. two north poles will attract each other. two south poles will attract each other.

Which of the following is not an appropriate unit for acceleration? (kg/12 mihr? m/min/sec cm/30c?