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Get Full Access to University Physics - 13 Edition - Chapter 10 - Problem 60p
Get Full Access to University Physics - 13 Edition - Chapter 10 - Problem 60p

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# A uniform, 8.40-kg, spherical shell 50.0 cm in diameter ISBN: 9780321675460 31

## Solution for problem 60P Chapter 10

University Physics | 13th Edition

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Problem 60P

A uniform, 8.40-kg, spherical shell 50.0 cm in diameter has four small 2.00-kg masses attached to its outer surface and equally spaced around it. This combination is spinning about an axis running through the center of the sphere and two of the small masses (?Fig. P10.56?). What friction torque is needed to reduce its angular speed from 75.0 rpm to 50.0 rpm in 30.0 s?

Step-by-Step Solution:

Solution 60 P Step 1: Data given Mass of sphere M = 8.40 kg Diameter D = 50.0 cm Radius R = D/2 = 25 cm Mass attached outside m = 2kg 75.0 rpm Angular velocity initial 1 75.0 rpm = 60 s × 1 rev 7.85 rad/s = 7.85 rad/s 1 5.0 rpm 2 Angular velocity final =250.0 rpm = 60 s × 1 rev= 5.23 rad/s 2= 5.23 rad/s Time taken t = 30 s We need to find the friction torque on the sphere

Step 2 of 4

Step 3 of 4

##### ISBN: 9780321675460

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