qz1sp08sol

# qz1sp08sol - January18,2008 PHY2053Discussion...

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

January 18, 2008 PHY2053 Discussion Quiz 1 (Chapter 1 & 2.1-2.4) Name:                                   UFID: *1. (5 pts) Newton’s law of universal gravitation is represented by  F = GMm/r ² , where  F   is the gravitational force,   M   and   m   are masses, and   r   is a length. What is the  dimension of the proportionality constant   G   ? (Hint: Force is given by mass times  acceleration.) Since the dimension of both sides should be the same, we get [F] = [G][Mm]/[r ² ]. Plug [F] = [M][a] = MLTˉ ² , [Mm] = M ²  and [r ² ] = L ²  into the equation, and solve it for   [G]: MLTˉ ²  = [G]M ² /L ²    [G] = Mˉ ¹ L ³ ² ***2. (5 pts) Two boats start together and race across 50 km-wide lake and back. The  boat that completes the round trip first wins. Boat A goes across at 40 km/h and  returns at 40km/h. Boat B goes across at 30km/h at first, but it doubles its speed when

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

View Full Document
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