{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

problem_sample_exam2

# problem_sample_exam2 - From Chapter 5 8.8.A wheel is...

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

From Chapter 5 8.8.A wheel is rotating at a rate of 2.0 revolutions every 3.0 s. Through what angle, in radians, does the wheel rotate in 1.0 s? = t, with in radians, in radians/s and t in seconds 2.0 revolutions in radian s will be 2x2 p radia ns accomplished in 3 s, so will be The angle of rotation in 1 second 2x2 p /3.0s = 4 p /3.0s =4.19 rd 12.14..The rotor in an amusement park ride where people stand against the inside of a cylinder. Once the cylinder is spin ning fast enough, the floor drops out. (a) What force keeps the people from falling out the bottom of the cylinder? (b) If the coefficient of friction is 0.40 and the cylinder has a radius of 2.5 m, what is the minimum angular speed of the cylinder so that the people don’t fall out? (Normally the operator runs it considerably faster as a safety measure.) a) the force of static friction b) using Newton’s law SF r =N = ma r = m v 2 /r = m 2 r but fs= mg = μ N= μ ma r =μ m 2 r = mg =v(g/μr)=v(9.8m/s 2 /(0.40*2.5m) =3.1 rad/s 14.16.(*) Earth’s orbit around the Sun is nearly circular. The period is 1 yr = 365.25 days. (a) In an elapsed time of 1 day, what is Earth’s an gular displacement? (b) What is the change in Earth’s velocity, v r ? (c) What is Earth’s average acceleration during 1

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