1. An 1800-kg truck moves to the south with a velocity of 9 m/s. 2. A 50-kg student has 100 kg•m/s of momentum to the west. How fast (in m/s) are they moving to the west?
3. A truck has a momentum of 5,000 units. What happens to the truck's momentum if the mass is cut in half?

Which of the following represents an upside-down image?

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.

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.