Rotational motion can be described with equations of motions. The rotational kin

Question

Rotational motion can be described with equations of motions. The rotational kinematic equations of motion given "in the image below" are valid in which of the following circumstances?

A ring allll l smaller radius between the the case What is the ratio of nent Aside from sure to clearly Tf vou 4/7/2017 PHYS 111 Midterm 2 V. 1 Page 6 of 9 10. (10 points) Rotational motion can be described with equations of motions. The rota tional kinematic equations of motion given class e (modified from the translations equations of motion that you learned), are valid in which of the following circumstances. A. Elliptical orbit of the planets about the sun. B. The trajectory of a cannonball launched from a cannon. C. A ball spinning in a circle on a string as the string's length is increased. D. A pendulum swinging in an incomplete circular arc. E. A is wheel speeding up at a constant rate. 11. (10 points) Now a spinning soccer ball is suddenly squashed to the size of a tennis ball

Explanation / Answer

These Equations are valid and applicable only when angular acceleration is constant.

For Case (A) of elleptical orbit, angular acceleration is variable, hence not applicable

For Case (B) Trajectory of Projectile motion is parabolic , since radius of curvature for each point is changing, hence angular acceleration is not constant. Hence Not applicable

For Case (C), increasing string length, causes variable angular acceleration. Hence Not Applicable

For case (D), Pendulum has variable angular acceleration. Hence Not Applicable

For Case (E), There is a constant angular acceleration. HENCE APPLICABLE

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