{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Chapter 26

# Chapter 26 - CHAPTER 26 Quick Quizzes 1(b Assuming that...

This preview shows pages 1–3. Sign up to view the full content.

C HAPTER 26 Quick Quizzes 1. (b). Assuming that your on-duty time was kept on Earth, you will be pleasantly surprised with a large paycheck. Less time will have passed for you in your frame of reference than for your employer back on Earth. 2. The answers to both of these questions is no . Both your clothing and your sleeping cabin are at rest in your reference frame, thus, they will have their proper length. There will be no change in measured lengths of objects within your spacecraft. Another observer, on a spacecraft traveling at a high speed relative to yours, will measure you as thinner (if your body is oriented in a direction perpendicular to the direction of motion relative to him) or will claim that you are able to fit into a shorter sleeping cabin (if your body is oriented in a direction parallel to your direction of travel relative to the other observer). 3. (a), (e). The outgoing rocket will appear to have a shorter length and a slower clock. The answers are the same for the incoming rocket. Length contraction and time dilation depend only on the magnitude of the relative velocity, not on the direction. 4. (a) False (b) False (c) True (d) False A reflected photon does exert a force on the surface. Although a photon has zero mass, a photon does carry momentum. When it reflects from a surface, there is a change in the momentum, just like the change in momentum of a ball bouncing off a wall. According to the momentum interpretation of Newton’s second law, a change in momentum results in a force on the surface. This concept is used in theoretical studies of space sailing. These studies propose building nonpowered spacecraft with huge reflective sails oriented perpendicularly to the rays from the Sun. The large number of photons from the Sun reflecting from the surface of the sail will exert a force which, although small, will provide a continuous acceleration. This would allow the spacecraft to travel to other planets without fuel. 5. (a). The downstairs clock runs more slowly because it is closer to the Earth and hence experiences a stronger gravitational field than the upstairs clock does. 327

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

View Full Document
C H A P T E R 2 6 Problem Solutions 26.1 (a) As the plane flies from O to B along path I, ground air wind = + v v v gives m m 100 20.0 120 s s ground v = + = m s , and 3 200 10 m 120 m s O B ground L t v × = = = 3 1.67 10 s × v ground v wind v air For the plane following path II from O to A , ground air wind = + v v v with perpendicular to each other. The Pythagorean theorem then yields and ground wind v v 2 2 2 2 m m 100 20.0 98.0 s s ground air wind v v v = = = m s , and 3 200 10 m 98.0 m s O A ground L t v × = = = 3 2.04 10 s × v ground v wind v air (b) For the return flight along path I, ground air wind = + v v v gives m m 100 20.0 80.0 s s ground v = = m s , so 3 200 10 m 80.0 m s BO ground L t v × = = = 3 2.50 10 s × v ground v wind v air As the plane flies from A to O along path II, are again perpendicular to each other. The Pythagorean theorem gives and ground wind v v 2 2 m 98.0 s ground air wind v v v = = , and AO ground L t v = = 3 2.04 10 s × v ground v wind
This is the end of the preview. Sign up to access the rest of the 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