Physics Question?

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I need help with 2 Physics questions. If you can answer just 1 of them, it would be greatly appreciated and whatever you can solve will be fine.



1. An Auto race is held on a circular track. A car completes one lap in a time of 15.1seconds, with an average tangential speed of 43.7 m/s. Find the following:

a. the average angular speed

b. the radius of the track


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2. The earth orbits the sun once a year (3.16 x 10^7 seconds) in a nearly circular radius 1.50 x 10^11 m. With respect to the sun, determine the following:

a. The angular speed of the earth


b. The tangential speed of the earth




(In the second question, when I put 10^7, the ^ symbol stands for  to the power of 7)

odu83 · Accepted Answer

Check:
1)  θ=ω*t
ω=2*π/15.1
0.416 rad/s

43.7=ω*r
r=43.7/0.416
105  m

2)  2*π*r=ω*t

 2*π*1.5*10^11=ω*3.16*10^7

ω= 2*π*1.5*10^11/(3.16*10^7)
2.98*10^4 rad/s
you are off by a factor of 2.  The question stated radius not diameter.
v=4.47*10^15
________________-

Anonymous · Answer

1) a = 0.4
    b = 106.5

2)a = 1.5(10^4)
   b = 2.25(10^11)

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Physics Question?

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