Question

Physics 119 General Physics II Winter 2019 Due Thureday, Jauary 24 For the whole assignment, remember, as with everything, neatness counts Conceptual Questions: These questions are to be answered with a short para- graph. You will be graded on the physics content of your answer as well as on its structure and conciseness. Problem/Question 1. Choose one answer: Gas pressure on the walls of a container is caused by (a) The force of gravity from the Earth. (b) The force of gravity from the Sun. (c) Molecular hits on the walls. (d) The heat coming from the environment. (e) The kinetic energy of the box. Problem/Question 2. Three vessels have different shapes, but the area of their bottom surface is the same, and all three are filled with water with the same depth (Fig. 1). Rank the magnitudes of the net forces exerted by the water on the bottom surface. Figure 1: Problem 2. Problem/Question 3. Choose one answer: Due to plaque buildup, a small part of a patient's aorta has a smaller radius than a regular, healthy aorta. Which of the following is true regarding the unhealthy and healthy aorta? (a) Flow in the clogged part of the unhealthy aorta will have a lower velocity and higher pressure than in a healthy aorta. (b) Flow in the clogged part of the unhealthy aorta will have a higher velocity and higher pressure than in a healthy aorta. (c) Flow in the clogged part of the unhealthy aorta will have a lower velocity and lower pressure than in a healthy aorta. (d) Flow in the clogged part of the unhealthy aorta will have a higher velocity and lower pressure than in a healthy aorta. (e) There will be no difference in the blood flow in the two cases

Answer 1

(1) Option c is correct. Because as the molecules inside the container hits the wall of the container produces Pressure on the wall of the container.

(2) The rank is. 2nd>1st>3rd. Because the amount of water is more in the 2nd container than other two. And the water container is more in the 1st container than the 3rd one.

(3) Option a is correct as in the case of unhealthy aorta the pressure is high because blood circulation became slower due to less velocity.

Problem 4. The causes are as follow.

1.the adhesive properties of water makes them closer.

2.the surface tension of water makes it to occupy less areas.

3.as it goes down the velocity increase causing it's path to narrow.