Recent content by sowmit

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    Moment of Inertia,not hw problems, but trying to understand the concept better.

    The question says: Imagine a solid disk, made of uniform material, a radius R and thickness L. What is the ratio of L/R if the moment of inertia of this disk about the axis passing through the center and perpendicular to the plane of the disk is the same as the moment of inertia about the axis...
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    Can anyone help me answer these moment of inertia questions please?

    The question says: Imagine a solid disk, made of uniform material, a radius R and thickness L. What is the ratio of L/R if the moment of inertia of this disk about the axis passing through the center and perpendicular to the plane of the disk is the same as the moment of inertia about the axis...
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    Can a 60 cm Guitar String Reach Frequencies Up to 20 kHz?

    Well it's not final exam. It's final homework problem set which is worth 15% of our grades. And this problem set is consisted of 4 homework problems and if I get one wrong, the whole 15% is gone. And you don't even have to ask him. All the students are allowed to get all the help they can in...
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    Can a 60 cm Guitar String Reach Frequencies Up to 20 kHz?

    But I am not sure how to find it. Anyhelp?
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    Can a 60 cm Guitar String Reach Frequencies Up to 20 kHz?

    Homework Statement A 60 cm guitar string under a tension of 50.000N has a mass per unit length of 0.100 g/cm. What is the highest resonant frequency that can be heard by a person capable of hearing frequencies up to 20000 HZ? Homework Equations f= n/2L * sqrt(F/ greek letter mu)...
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    Calculating Helium Mass with Work and Ideal Gas Law

    Homework Statement A sample of helium behaves as an ideal gas as it heated at a constant pressure from 273k to 373 k. If 20.0 J of work is done by the gas during this process, what is mass of helium present? Homework Equations I was thinking about pv=nRt, but not sure. The Attempt...
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    How Does Dropping a Log into a Lake Affect the Entropy of the Universe?

    Someone please help
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    How Does Dropping a Log into a Lake Affect the Entropy of the Universe?

    Homework Statement A 70-kg log falls from a height of 25m into a lake. If the log, the lake, and the air are all at 300k, find the change in entropy of the Universe during this process. Homework Equations delta S = Q/T The Attempt at a Solution T= 300k M log=70 kg = 7000g...
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    What is the Young's modulus of a nylon rope used for climbing?

    Homework Statement For safety in climbing, a mountaineer uses a nylon rope that is 50 m long and 1.0 cm in diameter. When supported, a 90 kg climber, sthe rope elongates 1.6m. Find it's Young's modules? Homework Equations F/A= Y * delta L/ Lo -> Y= F*Lo/ A*delta L The Attempt at...
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    Calculating Tire Rotation in Radians and Revolutions - Homework Problem Solution

    Please help me with this problem?? Homework Statement The question is: the tires on a new car have a diameter of 2.0 ft and are warranted for 60000 miles (3.2*e^9 ft). (a) Determine the angle (in radians) through which one of the tires will rotate? (b) How many revolutions are...
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    Why Is My Vector Calculation Incorrect?

    Solve their north and west component? How is that possible? Isn't that given in the problem already?
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    Why Is My Vector Calculation Incorrect?

    How to solve this vector problem? Homework Statement A car travels 20 km due north and then 35 km in a direction of 60degree west of north. Find the magnitude and direction of a single vector that gives the net effect of the car trip. Homework Equations (vector) R = square root...