Recent content by munchy35

thank you for the help! i got the right answer. =)

http://www.physics.upenn.edu/courses/gladney/phys151/lectures/lecture_feb_28_2003.shtml#hairpin_Biot_Savart_diagrammed i found this and if you scroll down to the bottom, it is my problem. i plugged in my numbers and got 3.5 * 10^-4. this isn't right either. one try left. =/

the program is mastering physics. i have two tries left!

Homework Statement Find B at the center of the 4.3 cm radius semicircle in the figure . The straight wires extend a great distance outward to the left and carry a current I = 6.6 A. _________ _________) That is kind of what the figure looks like. Homework Equations/The Attempt at...

nevermind. figured it out!

Homework Statement The filament of a lightbulb has a resistance of R0=12 Omegas at 20 degrees Celsius and 140 Omegas when hot. a) Calculate the temperature of the filament when it is hot, and take into account the change in length and area of the filament due to thermal expansion...

R1/R2 = R3/R4 i don't think these values would change if the voltage changes 10% during the measurements.

Homework Statement Suppose that in the course of a measurement the bridge is balanced and then the power supply voltage changes by 10%, what will happen to the balance of the bridge? Explain. Homework Equations No equations. The Attempt at a Solution When I think it out...

now i have no idea how to approach part b once i have my answers for part a.

nevermind. i got the right answer. .5 L = .0005 m^3 gotta work on my conversions!

okay so I realized .5 L = .005 m^3 but still I get 66 for ceramic and 9.4 for shiny. it still says I am wrong

Homework Statement A ceramic teapot (epsilon(e) = 0.70) and a shiny one (epsilon(e) = 0.10) each hold 0.50 L of tea at 99 degrees C. a) Estimate the rate of heat loss from each. Consider only radiation, and assume the surroundings are at 20 degrees C. b.)Estimate the temperature drop...

i'm just confused. what equation should i be using to find the answer. the Archimedes' equation or the equation for work.

Homework Statement A flotation device is in the shape of a right cylinder, with a height of 0.500 m and a face area of 4.00 m2 on top and bottom, and its density is 0.400 times that of fresh water. It is initially held fully submerged in fresh water, with its top face at the water surface...

i used the component method so for horizontal component i said t1cos40=t2cosx (i'm just using x for theta) t2=t1cos40/cosx and t1 = t2cosx/cos40 so for part a, i used the t2 equation and just assumed for t2 to be a minimum cos x had to be maximum, the maximum cosx=1, so x= 0...