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

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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?
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