Ch07 - Chapter 7, Rotational Motion and the Law of Gravity...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 7, Rotational Motion and the Law of Gravity C HAPTER 7 1. A grindstone spinning at the rate of 8.3 rev/s has what approximate angular speed? a. 3.2 rad/s b. 26 rad/s c. 52 rad/s d. 81 rad/s 2. A ventilation fan has blades 0.25 m in radius rotating at 20 rpm. What is the tangential speed of each blade tip? a. 0.02 m/s b. 0.52 m/s c. 5.0 m/s d. 20 m/s 3. A ventilation fan has blades 0.25 m long rotating at 20 rpm. What is the centripetal acceleration of a point on the outer tip of a blade? a. 1.1 m/s 2 b. 0.87 m/s 2 c. 0.55 m/s 2 d. 0.23 m/s 2 4. A 0.30-m-radius automobile tire rotates how many rad after starting from rest and accelerating at a constant 2.0 rad/s 2 over a 5.0-s interval? a. 12.5 rad b. 25 rad c. 2.0 rad d. 0.50 rad 5. A 0.30-m-radius automobile tire accelerates from rest at a constant 2.0 rad/s 2 . What is the centripetal acceleration of a point on the outer edge of the tire after 5.0 s? a. 300 m/s 2 b. 33 m/s 2 c. 30 m/s 2 d. 3.0 m/s 2 75
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chapter 7, Rotational Motion and the Law of Gravity 6. A 0.30-m-radius automobile tire accelerates from rest at a constant 2.0 rad/s 2 over a 5.0-s interval. What is the tangential component of acceleration for a point on the outer edge of the tire during the 5-s interval? a. 33 m/s 2 b. 6.7 m/s 2 c. 0.60 m/s 2 d. 0.30 m/s 2 7. A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s 2 . What is its angular speed at the instant it goes through an angular displacement of 4.2 rad? a. 0.025 rad/s b. 0.11 rad/s c. 0.46 rad/s d. 1.2 rad/s 8. A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s 2 . What is the time interval required for it to reach a 4.2-rad displacement after starting from rest? a. 1.8 s b. 2.0 s c. 16 s d. 18 s 9. A 0.40-kg mass, attached to the end of a 0.75-m string, is whirled around in a circular horizontal path. If the maximum tension that the string can withstand is 450 N, then what maximum speed can the mass have if the string is not to break? a. 370 m/s b. 22 m/s c. 19 m/s d. 29 m/s 10. Two satellites are monitored as they orbit the Earth; satellite X is eight times as far from the Earth’s center as is satellite Y. From Kepler’s third law one may conclude that the period or revolution of X is what factor times that of Y? a. 1/2 b. 2.0 c. 4.0 d. 22.6 76
Background image of page 2
Chapter 7, Rotational Motion and the Law of Gravity 11. A point on the rim of a 0.30-m-radius rotating wheel has a tangential speed of 4.0 m/s. What is the tangential speed of a point 0.20 m from the center of the same wheel? a. 1.0 m/s b. 1.3 m/s c. 2.7 m/s d. 8.0 m/s 12. A point on the rim of a 0.25-m-radius fan blade has centripetal acceleration of 0.20 m/s 2 . Find the centripetal acceleration of a point 0.05 m from the center of the same wheel.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/25/2008 for the course PHY 231C taught by Professor Pratt during the Spring '06 term at Michigan State University.

Page1 / 14

Ch07 - Chapter 7, Rotational Motion and the Law of Gravity...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online