Homework Help: Physics(Please respond)

Posted by Hannah on Tuesday, June 5, 2012 at 10:58am.

A person is riding a bicycle, and its wheels have an angular velocity of 26.0 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop. During braking, the angular displacement of each wheel is 17.6 revolutions. (a) How much time does it take for the bike to come to rest? (b) What is the anguar acceleration (in rad/s2) of each wheel?

Do I need to convert revolutions to radians first?

Physics(Please respond) - Elena, Tuesday, June 5, 2012 at 11:31am
Equations for decelerated motion are
ω=ωₒ - ε•t,
φ = ωₒ•t - ε•t²/2.

Since ω =0, φ = 2•π•N, where N =17.6 rev.
these equatuions are
0=ωₒ-ε•t, …………………… (1)
2•π•N = ωₒ•t - ε•t²/2 …………(2)
From (1)
ε = ωₒ/t……………………… (3)
Plug it in (2) and obtain
t= 4•π•N/ ωₒ.
Then determine angular acceleration using (3).
Physics(Please respond) - Hannah, Tuesday, June 5, 2012 at 12:19pm
so first I have to do equation 2? So

2*pi*17.6 = I am not sure what wo is. Would it be the 26.0?

Answer this Question

Related Questions

Physics - A person is riding a bicycle, the wheels of a bicycle have an angular ...
physics - A person is riding a bicycle, the wheels of a bicycle have an angular ...
physics - A person is riding a bicycle, the wheels of a bicycle have an angular ...
physics - Search: A person is riding a bicycle, the wheels of a bicycle have an ...
Physics(Please help) - A person is riding a bicycle, and its wheels have an ...
physics - A person is riding a bicycle, and its wheels have an angular velocity ...
science , physics - A person is riding a bicycle, and its wheels have an angular...
Physics - A person is riding a bicycle, and its wheels have an angular velocity ...
Physics - A penny farthing is a bicylce that was popular between 1870 and 1890. ...
Physics - A bicycle starts at the origin of a circular track that has a ...

For Further Reading

First Name:
School Subject:
Answer: