- #1
rgalvan2
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Two identical blocks are tied together with a string and placed along the same radius of a turntable that is spinning about its center. The inner block is 4 cm from the center and the outer block is 5 cm from the center. The coefficient of static friction between the turntable and the blocks is µs = 0.74, and the string is taut.
a) What is the maximum angular frequency such that neither block slides?
I got w= 12.7 which was right
b) Now suppose that the blocks each have a mass m = 21 g. For the value of w you just found, what is the tension in the string?
T= ?N
I am stuck on b) I have 2 eqns:
T+[tex]\mu[/tex]mg=mR1w^2
-T+[tex]\mu[/tex]mg=mR2w^2
So I keep getting 17N each time I try. What am i doing wrong?
T=mR1w^2-[tex]\mu[/tex]mg
=21x.05x12.7^2 - .74x21x9.81
=169.4-152.4= 17N
Help Please!
a) What is the maximum angular frequency such that neither block slides?
I got w= 12.7 which was right
b) Now suppose that the blocks each have a mass m = 21 g. For the value of w you just found, what is the tension in the string?
T= ?N
I am stuck on b) I have 2 eqns:
T+[tex]\mu[/tex]mg=mR1w^2
-T+[tex]\mu[/tex]mg=mR2w^2
So I keep getting 17N each time I try. What am i doing wrong?
T=mR1w^2-[tex]\mu[/tex]mg
=21x.05x12.7^2 - .74x21x9.81
=169.4-152.4= 17N
Help Please!