{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

practice_1 - Physics 140 Fall 2005 Midterm 1 1(P An empty...

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Physics 140 Fall 2005 Midterm 1 1. (P) An empty 700-kg elevator suspended from a single cable is accelerating vertically downward at 3.0 m/s 2 . What force is exerted on the elevator by the cable? 3VECTORS.GIF a) 2.1kN, down b) 2.1kN, up c) 4.8kN, down d) 4.8kN, up e) 9.0kN, up 2. Buttons are lined up along the diameter of a circular platter that rests on a horizontal table. As the platter is spun up to a rate of 33 revolutions per minute, the buttons lying a distance greater than 0.1m from the center are observed to fly off. What is the coefficient of static friction between the platter and the buttons? 1
Image of page 1

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

View Full Document Right Arrow Icon
Physics 140 Fall 2005 Midterm 1 3. n the tug of war shown below, each team pulls on the rope with a force of 200-lb. The tension in the rope is FUZZYDIE.GIF 4. In a video game, a villain in an elusive maneuver flies across the screen according to the programmed trajectory (in pixel units) r = (800–4 t +8 t 2 ) i + (920 + 2 t + 6 t 2 ) j , where i is in the horizontal and j the vertical directions. At what time is the velocity of villain aligned with the screen diagonal? 2
Image of page 2
Physics 140 Fall 2005 Midterm 1 5. A “solar sail” spacecraft would use the slight pressure of radiation from the sun to generate thrust for interplanetary travel. If the spacecraft starts essentially from rest well above the Earth, and experiences a constant, net acceleration of 10 -5 g for the whole journey, how long would it take to reach Pluto, a distance of 7.6 x 10 12 m away? (Recall that there are about π x 10 7 s in one year) a) 2.5 yr b) 12.5 yr c) 48 yr d) 69 yr e) 125 yr
Image of page 3

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

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    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.

    Student Picture

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

  • Left Quote Icon

    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.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    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.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern