# HW21.sol - homework 21 RAHMAN TARIQUE Due 3:00 am Question...

This preview shows pages 1–2. Sign up to view the full content.

homework 21 – RAHMAN, TARIQUE – Due: Apr 21 2008, 3:00 am 1 Question 1, chap 15, sect 4. part 1 of 2 10 points g m v negationslash = 0 r a r a t a φ θ A simple pendulum has a period of 5 . 5 s. The acceleration of gravity is 9 . 8 m / s 2 . What is its length? Correct answer: 7 . 50917 m (tolerance ± 1 %). Explanation: The period of a simple pendulum is T = 2 π radicalBigg g so the length of the simple pendulum is = parenleftbigg T 2 π parenrightbigg 2 g = 7 . 50917 m Question 2, chap 15, sect 4. part 2 of 2 10 points What would its period be on the Moon, where its gravity is 1 . 67 m / s 2 ? Correct answer: 13 . 3235 s (tolerance ± 1 %). Explanation: The period of the simple pendulum on the Moon is T moon = 2 π radicalBigg g moon = 13 . 3235 s . Question 3, chap 15, sect 5. part 1 of 1 10 points The sitar, an Indian musical instrument, has a set of strings that vibrate and produce music, even though they are never plucked by the player. These ”sympathetic strings” are identical to the plucked strings and are mounted below them. What is your explana- tion? 1. Scientists are still studying to find the reason. 2. The upper strings are connected to the lower strings with invisible strings. 3. The lower strings are resonating with the upper. correct 4. The lower strings are plucked by a ghost. Explanation: The lower strings are resonating with the upper strings. Question 4, chap 15, sect 5. part 1 of 1 10 points If the handle of a tuning fork is held solidly against a table, the sound from the tuning fork becomes louder. Why? How will this affect the length of time the fork keeps vibrating?

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.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern