# Search results for query: *

1. ### Rate of Rotation for a Pulley (Question for a Reasoning/Thinking Skills Test)

Thanks for your response, rock.freak667. I have done some work, shown below, and have arrived at the correct answer. However, could someone please explain the formula v = rω ? How can I see this formula intuitively (especially since I have little background in physics)? Thank you...
2. ### Rate of Rotation for a Pulley (Question for a Reasoning/Thinking Skills Test)

Homework Statement *Please note that the following question is for a reasoning/thinking skills test. As I have only studied physics up to junior year in high school (and did not study pulleys then), I am unsure of the depth of physics knowledge required in this question, though it seems to...

4. ### Energy required to expand V of cylinder

Homework Statement Calculate the work done when the volume of a cylinder is increased by 90.0 L against the atmospheric pressure. Think about the upward movement of a piston as it expands the volume of a cylinder. --- I am actually an AP Chemistry student and am supposed to do this...
5. ### Wavelength (Open Air Column)

Thanks for your reply, dynamicsolo. However, I am looking in my textbook and it says that the general formula for length of an open air column (in both ends) in wavelengths is: L = \frac{\lambda}{2} . What may I be missing?
6. ### Wavelength (Open Air Column)

Hello there, For the following problem, I am arriving at an answer different from the given one so I would appreciate any help or hints. Thank you. My work is shown below. --- 1. A slightly smaller plastic pipe is inserted inside a second plastic pipe to produce an air column, open at both...
7. ### Calculating Work - With Friction

Thanks for your reply. However, his daughter is exerting friction on the entire toboggan. Wouldn't the father have to compensate for this by doing more work?
8. ### Calculating Work - With Friction

Hello everyone, I am having some trouble understanding why friction is not accounted for when calculating work done, as in the following two problems. If an object is experiencing friction, wouldn't there need to be more work done to continue moving the object? Thank you! --- 1. A father...
9. ### Calculating Normal Force

Hello there, I am trying to find the coefficient of friction for a rectangular wooden block. I have the force of friction but I do not know how to find the normal force. The weight of 1 block is 2N. Could someone please explain how I could find the normal force? Would I just multiply 2N by...
10. ### Two Kinematics Problems

Thank you for your replies, foxjwill and kurdt. I got the answers!
11. ### Two Kinematics Problems

Thanks for your reply. The answers are: 1. a) 7.5 s b) 3.8 m/s 2. a) 15s
12. ### Two Kinematics Problems

Thank you for your replies. @Foxjwill, so are you recommending me to use (v_2)^2 = (v_1)^2 + 2ad ? @Kurdt, are you recommending me to use displacement = (v_1)t + \frac{at^2}{t} ? Also, I tried to represent the sum of the distance of the two as such but I did not get the right answer...
13. ### Two Kinematics Problems

[SOLVED] Two Kinematics Problems Hello everyone, I am having some trouble with the following two kinematic problems and I would appreciate any help or hints. Thank you! --- 1. Two rugby players are running towards each other. They are 37 m apart. If one is accelerating from rest at 0.5...
14. ### Freuuency: Variations of a String

Thanks for your reply, malty. Could you please expound on your answer a bit further? I am still lost. In particular, I am confused by density and how to "find an expression for f_2 in terms on an integer times f_1. With regards to the homework thread, I apologise for posting here as I was not...
15. ### Freuuency: Variations of a String

Hello everyone, I am struggling with a problem and I would appreciate any help or guidance. Thank you very much! --- 1. A guitar string has a frequency of 2048 Hz. If both the tension and length are doubled, what is the new frequency of the string? I know that the \frac{f_1}{f_2} =...
16. ### Decibel Comparison Problem

Thank you very much for your help!
17. ### Decibel Comparison Problem

Thanks for your reply. I know how to calculate the difference in sound level for integers divisible by 10. For example, 60 dB is 10^2 or 100 times louder than 40 dB. However, I know that I must use logarithms for calculating the difference in sound level for all other integers.
18. ### Decibel Comparison Problem

Hello everyone, Could anyone please show me the appropriate formulas which I need for the following question? 1. How many times louder or softer than sound level of 40 dB is a sound at a) 68 dB? b) 0.3 dB? Thank you.