show te steps or equation to use 1. A solid disk has a moment of inertia of 20 k
ID: 1436772 • Letter: S
Question
show te steps or equation to use
1. A solid disk has a moment of inertia of 20 kg m2 and a radius of 1.5 m. What is its mass?
a. 8.9 kg b. 13.3 kg c. 17.8 kg d. 26.7 kg e. none of these
3. The torque felt at the edge of a ceiling fan’s blade is 5.2 N m. If the power supplied to the mixer is 20 W, what is the maximum angular speed of the ceiling fan?
a. 0.6 rad/s b. 3.8 rad/s c. 11.9 rad/s d. 23.9 rad/s e. none of these
4. Gliese 832c is an extrasolar planet located about 16 light years away from Earth. Its radius is about 1.75 times larger than Earth’s, and its mass is about 5.4 times larger. How would your weight on Gliese 832c compare to your weight on Earth?
a. 76% lighter b. 32% lighter c. 57% heavier d. 76% heavier
5. List the objects, from smallest moment of inertia to largest.
a. solid sphere, hollow sphere, solid disk
b. solid sphere, solid disk, hollow sphere
c. hollow sphere, solid sphere, solid disk
d. solid disk, hollow sphere, solid sphere
e. none of these
6. Which object reaches the bottom of the ramp first?
a. solid sphere b. hollow sphere c. solid disk d. they all reach the bottom at the same time e. not enough information
7. Now assume the solid sphere has the same radius and the same moment of inertia as the hollow sphere. What is the mass of the solid sphere?
a. msolid = mhollow b. msolid = 2/3 mhollow c. msolid = 2/5 mhollow
d. msolid = 5/3 mhollow e. none of these
Explanation / Answer
1. M = 2I/R2 = 2 x 20/2.25 = 17.8 kg (c)
3 w = 20/5.2 = 3.8 rad/s (b)
4. W'/W = M'R2/MR'2 = 5.4/1.752 =1.76 so 76 % heavier (d)
5. (b)
6. (a)
7. 2/5MsR2 = 2/3MhR2 => Ms = 5/3Mh (d)
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.