Are My Test Review Answers Correct?

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SUMMARY

The discussion revolves around a user's request for validation of their answers to a test review involving physics problems. The user initially provided incorrect calculations due to improper unit conversions, specifically failing to convert grams to kilograms for mass in velocity equations. After correcting these conversions, the user reported a new velocity of 673 m/s for problem #3, significantly higher than the initial 22 m/s. The user seeks confirmation on the accuracy of their revised answers for problems 2 and 3, which include values for amplitude, time, velocity, wavelength, and frequencies.

PREREQUISITES
  • Understanding of basic physics concepts, particularly wave mechanics.
  • Familiarity with unit conversions, specifically from grams to kilograms.
  • Knowledge of velocity equations in wave physics.
  • Ability to interpret and analyze problem statements and equations.
NEXT STEPS
  • Review the principles of wave mechanics and the relationship between mass, velocity, and wavelength.
  • Study unit conversion techniques, focusing on mass conversions in physics problems.
  • Learn how to apply the velocity equation in different contexts, particularly in wave-related scenarios.
  • Practice solving similar physics problems to reinforce understanding of the concepts discussed.
USEFUL FOR

Students studying physics, particularly those preparing for tests involving wave mechanics, as well as educators looking for examples of common calculation errors and their corrections.

iirevolverii
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Hey hows everyone doing, this is the first time I am posting HW.
I need help with 4 problems which are from my test review.
Attached are scan images of the test review sheet with solved answers.
I need to know if I have done this right. Thanks.

Homework Statement



On image.

Homework Equations



On image.

The Attempt at a Solution



On image.

Youll have to fix the links. When you see the image, just right click and save on desktop to preview in small version, because the image is big. Thanks.

www.imghost.cc/files/1b9puskkr5mofc56qvh8.jpg[/URL]

[PLAIN]www.imghost.cc/files/4d755578ezxik4w2kf8g.jpg[/URL]
 
Last edited by a moderator:
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thanks for fix the links..

Someone please check over my work.
I did notice for question numbers 2 and 3, i forgot to convert the grams to kilograms.
Once I go home from work, will sovle them with the converted numbers.
 
Last edited:
On problem #3 you need to convert the mass to kilograms when calculating the mass-per-unit-length in the velocity equation.

Your numbers will turn out more reasonable. 22 m/s on a short string seems a bit much :p
 
kalery said:
On problem #3 you need to convert the mass to kilograms when calculating the mass-per-unit-length in the velocity equation.

Your numbers will turn out more reasonable. 22 m/s on a short string seems a bit much :p

I just did that and what i got for velocity was 673 m/s.. this is way more than the previous answer of 22 m/s.

After converting the grams to kilograms.. this is what i got for problem #'s 2 and 3.
2) A = 0.146 m
t = 0.160 s

3) v = 673 m/s
wavelgenth = 3.00 m
f1 = 224 hz
f3 = 673 hz

Did I do the rest correctly?
 
Last edited:
I just redid problems 2 and 3 with the correct conversions.

You will have to fix the links, it won't let me because I don't have 15 posts.

vvww.imghost.cc/files/l2mjf2aws0n63fafwxbm.jpg

vvww.imghost.cc/files/377doh319isr7usmkatz.jpg
 
Can anyone please check over my work.. I need to know if what I studied is right.
I will greatly appreciate it.
 

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