# hw6 - lavallo (jhl936) Homework 06 florin (58140) 1 This...

This preview shows pages 1–3. Sign up to view the full content.

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: lavallo (jhl936) Homework 06 florin (58140) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points A dragster maintains a speedometer reading of 100 km/h and passes through a curve with a constant radius. Which statement is true? 1. All are wrong. 2. The dragster rounded the curve at a changing speed of 100 km/h. 3. The dragster rounded the curve at a changing velocity of 100 km/h. correct 4. The dragster rounded the curve at a con- stant velocity of 100 km/h. 5. The dragster moved along a straight line at a constant velocity of 100 km/h. Explanation: Constant velocity means not only constant speed, but constant direction, so the velocity is changing. A car rounding a curve changes its direction of motion, regardless of its speed. 002 10.0 points A mass slides with negligible friction on a circular track of 1 m radius oriented vertically. Its speed at the position shown in the figure is 3.13 m/s. The acceleration of gravity is 9.8 m/s 2 . v At the position shown in the figure, which of the labeled arrows best represents the di- rection of the acceleration of the mass? 1. 2. 3. The mass is traveling at a constant veloc- ity, therefore it has no acceleration. 4. 5. 6. 7. correct 8. 9. Explanation: The magnitude of the centripetal is a r = v 2 r = (3 . 13 m / s) 2 1 m 9 . 8 m / s 2 . The centripetal acceleration is inward r and gravity is down k . lavallo (jhl936) Homework 06 florin (58140) 2 a a r g 003 10.0 points Calculate the average speed of the Moon around the Earth. The Moon has a period of revolution of 27.3 days and an average dis- tance from the Earth of 3 . 84 10 8 m. 1. 3 . 68245 10 6 m / s 2. 2054.6 m/s 3. 2045.8 m/s 4. 61374 . 2 m / s 5. 1022 . 9 m / s correct 6. 8 . 83789 10 7 m / s 7. None of these 8. 3688.5 m/s 9. 584000 m/s Explanation: Let : T = 27 . 3 d and R = 3 . 84 10 8 m ....
View Full Document

## This note was uploaded on 04/09/2010 for the course PHY 58150 taught by Professor Florin during the Spring '10 term at University of Texas at Austin.

### Page1 / 5

hw6 - lavallo (jhl936) Homework 06 florin (58140) 1 This...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online