recitation07-solutions

# recitation07-solutions - Physics2750 Recitation07 1...

• Notes
• 4

This preview shows page 1. Sign up to view the full content.

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

Unformatted text preview: Physics 2750 Recitation 07 1. During the time a compact disc (CD) accelerates from rest to a constant rotational speed of 477 rev/min, it rotates through an angular displacement of 0.250 rev. What is the angular acceleration of the CD? 2. What is the tangential speed of Nairobi, Kenya, a city near the equator? The earth makes one revolution every 23.93 h and has an equatorial radius of 6380 km. a) 74.0 m/s c) 148 m/s e) 465 m/s b) 116 m/s d) 232 m/s 3. What is the ratio of the tangential acceleration of a point on the end of the rod to that of a point a distance L/2 from the end of the rod? a) 1:1 c) 2:1 e) 1:4 b) 1:2 d) 4:1 4. What is the ratio of the centripetal acceleration of a point on the end of the rod to that of a point a distance L/2 from the end of the rod? a) 1:1 c) 2:1 e) 1:4 b) 1:2 d) 4:1 5. What is the ratio of the angular speed (at any instant) of a point on the end of the rod to that of a point a distance L/2 from the end of the rod? a) 1:1 c) 2:1 e) 1:4 b) 1:2 d) 4:1 6. What is the ratio of the tangential speed (at any instant) of a point on the end of the rod to that of a point a distance L/2 from the end of the rod? a) 1:1 c) 2:1 e) 1:4 b) 1:2 d) 4:1 ij i j 7. A particle located at the position vector r (in meters) has a force F 2 3 (in N) acting on it. The torque about the origin is: a) (1 k )N∙m b) (5 k )N∙m c) (–1 k )N∙m d) (–5 k )N∙m e) (2 + 3 )N∙m j i 8. Four identical particles, each with mass m, are arranged in the x; y plane as shown. They are connected by light sticks to form a rigid body. If m = 2.0 kg and a = 1.0 m, calculate the rotational inertia (moment of inertia) of this array about the y axis 9. An object of mass m is tied to a light string wound around a wheel that has a moment of inertia I and radius R. The wheel bearing is frictionless, and the string does not slip on the rim. Find the tension in the string and the acceleration of the object. Problem 9 Problem 10 10. A sphere of mass m1 and a block of mass m2 are connected by a light cord that passes over a pulley, as shown in the figure. The radius of the pulley is R and the moment of inertia about its axle is I. The block slides on a frictionless, horizontal surface. Find an expression for the linear acceleration of the two objects as a function of m1, m2, I and R. ...
View Full Document

• Spring '10
• Kostzin
• rod, tangential speed, constant rotational speed

{[ 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