x
Info
x
Warning
x
Danger
 / 
 / 
 / 
  31. A disk has a moment of inertia of 3.0

Question :   31. A disk has a moment of inertia of 3.0 : 2102172

 

31. A disk has a moment of inertia of 3.0 ´ 10-4 kg?m2 and rotates with an angular speed of 3.5 rad/sec. What net torque must be applied to bring it to rest within 3 s?

A. 4.5 ´ 10-3 N?m

B. 7.5 ´ 10-4 N?m

C. 3.5 ´ 10-4 N?m

D. 5.0 ´ 10-4 N?m

32. The Earth moves about the Sun in an elliptical orbit. As the Earth moves closer to the Sun, which of the following best describes the Earth-Sun system's moment of inertia?

A. decreases

B. increases

C. remains constant

D. none of the above choices are valid

33. A bowling ball has a mass of 7.0 kg, a moment of inertia of 2.8 ´ 10-2 kg?m2 and a radius of 0.10 m. If it rolls down the lane without slipping at a linear speed of 4.0 m/s, what is its angular speed?

A. 0.80 rad/s

B. 10 rad/s

C. 0.050 rad/s

D. 40 rad/s

34. A baseball pitcher, loosening up his arm before a game, tosses a 0.15-kg ball using only the rotation of his forearm, 0.32 m in length, to accelerate the ball. If the ball starts at rest and is released with a speed of 12 m/s in a time of 0.40 s, what is the average angular acceleration of the arm and ball?

A. 0.067 rad/s2

B. 94 rad/s2

C. 15 rad/s2

D. 37 rad/s2

35. A baseball pitcher loosens up his pitching arm. He tosses a 0.15-kg ball using only the rotation of his forearm, 0.32 m in length, to accelerate the ball. What is the moment of inertia of the ball alone as it moves in a circular arc with a radius of 0.32 m?

A. 1.5 ´ 10-2 kg?m2

B. 16 ´ 10-2 kg?m2

C. 4.0 ´ 10-2 kg?m2

D. 7.6 ´ 10-2 kg?m2

 

Solution
5 (1 Ratings )

Solved
Physics 1 Year Ago 215 Views
This Question has Been Answered!
Unlimited Access Free
Explore More than 2 Million+
  • Textbook Solutions
  • Flashcards
  • Homework Answers
  • Documents
Signup for Instant Access!
Ask an Expert
Our Experts can answer your tough homework and study questions
312080 Physics Questions Answered!
Post a Question