ch6 problem50

# Physics: Principles with Applications

• Homework Help
• PresidentHackerCaribou10582
• 2

This preview shows pages 1–2. Sign up to view the full content.

Chapter 6, Problem 50 Question Problem (a) The baseball was at rest at the top of the tree. Therefore, the total mechanical energy of the ball is equal to its gravitational potential energy. That is, where is the mass of the baseball, is the acceleration due to gravity, and is the vertical displacement. Let be the speed of the ball when it hits the ground. The total mechanical energy of the ball at a point just above the ground is equal to the kinetic energy of the ball. That is, . Apply the principle of conservation of mechanical energy. Solve for . Substitute for , and 13.0 m for . Thus, the baseball would hit the ground with a speed of . (b) Express the mass of the baseball in kilograms. Find the total mechanical energy of the ball before it was dropped from the tree. Find the total mechanical energy

This preview has intentionally blurred sections. Sign up to view the full version.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: of the ball at a point just above the ground. (1 of 2) [2/4/2008 4:37:49 PM] The decrease in the mechanical energy corresponds to the work done by the force of air resistance on the ball. The net work done due to the air resistance can be calculated as shown below. Let be the average force of air resistance, and let be the distance over which the force acts. Consider the equation connecting the net work done and the average force of air resistance. Substitute for , 13.0 m for , and solve for . Thus, the average force of air resistance on the ball would be . (2 of 2) [2/4/2008 4:37:49 PM]...
View Full Document

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern