## Water leaves a fire hydrant pipe, which has an area of 7.8 × 10-3

Question Water leaves a fire hydrant pipe, which has an area of 7.8 × 10-3 m2, with a speed of 2.0 m/s. The firehose attached to the hydrant has a nozzle with an area of 3.1 × 10-4 m2. If the nozzle is 10.5 m higher than the hydrant, what is the change in pressure of the water? Use 1.00 × 103 kg/m3 as the density of water.

## The graph below represents the force on a 5.00kg object as it is moved a

Question The graph below represents the force on a 5.00kg object as it is moved a through a displacement. A. How much work is done in the following graph as an object is moved from 16.0m to 22.0m?B. If the object was originally moving at 3.50m/s when it had reached 16.0m, how fast was it going at 22.0m?

## A 62.0 kg water skier at rest jumps from the dock into a 775 kg

Question A 62.0 kg water skier at rest jumps from the dock into a 775 kg boat at rest on the east side of the dock. If the velocity of the skier is 4.50 m/s as she leaves the dock, what is the final velocity of the skier and boat?

## Please help

Sheila and her toboggan have a total mass of 45 kg.

Question Please help

Sheila and her toboggan have a total mass of 45 kg. At one point during her toboggan ride down a frictionless hill, she is 10.0m higher than the bottom of the hill and moving at a speed of 8.0m/s. a) How much gravitational potential energy does she have? b) How much kinetic energy does she have? c) How much energy does she have in total? d) How fast will Sheila be moving when she reaches the bottom of the hill? e) How high is the hill?

## 6. You get to the dive site, put on your gear, and are ready to

Question 6. You get to the dive site, put on your gear, and are ready to go under. You check your scuba tank. It is filled to a pressure of about 22,000 kPa (kilopascals) at a temperature of 300 K. The volume of the tank is 25 L. You begin to wonder: If temperature remains constant, what would happen to the volume of gas in the tank if its pressure increased? (11 points) A. List and briefly describe the four thermal processes where pressure, volume, temperature, and heat are each held constant. (8 points) 7. You have a great dive! When you return the beach, you discover remnants of an abandoned building. It is falling down and in ruins. (6 points) A. Identify the scientific process that explains this situation. (4 points)