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Question about viruses .... Homework Statement The question is true or false: All virus particles produced from infected cells are infectious. Homework Equations conceptual The Attempt at a Solution I find this to be very confusing. On the one hand, some virions are...
2. ### Chem question on dash-wedge structures

Homework Statement how would you draw this structure in 3d using dash-wedge representation? HN=C=CH2 From my guess, I drew the N=C=C as being parallel, and the two hydrogens coming off the second C without having any dashes or wedges, but curving at 120 degrees from the carbon. For the...
3. ### Lenses question

physics textbook
4. ### Lenses question

k i edited it
5. ### Lenses question

Homework Statement An object is 18cm in front of a diverging lens that has a focal length of -12cm. How far in front of the lens should the object be placed so that the size of its image is reduced by a factor of 2.0? Homework Equations 1/do + 1/di = 1/f m= -di/do The Attempt at a...
6. ### Another question about magnetic fields

but by this I get the thumb to point out of page, the fingers to point to the right, and the force to point directly up...and I do not see up as a choice...aaah i cant conceptualize

8. ### Help with lenz's law

aah so it will also be up?
9. ### Another question about magnetic fields

Then It will go to the right, away from the battery, correct? With the right hand rule, fingers are straight and thumb is pointing away from fingers at a 90* angle. A line going directly from thefinger tips will be the direction of the magnetic field. A line coming straight out of your palm...
10. ### Help with lenz's law

hmm still confused, would the force then be pushing down for the first part? and the last 2 right? if i'm wrong could you tell me why i have a test today and want to know these problem explanations in and out
11. ### Another question about magnetic fields

Homework Statement Wut force will the rod that rests on the 2 parallell rails feel when the battery switch is closed http://s336.photobucket.com/albums/n343/physicsdude69/?action=view&current=phys2.jpg a. to the right b. out of the page c. to the left d. into the page Homework...
12. ### Help with lenz's law

hmm so will the net force act then against the object??? such that for a. Up b. zero c. down
13. ### Help with lenz's law

okay so it looks like i had reversed it then a. should be clockwise b. zero c. counterclockwise to counter the into page but still how can i figure out the forces...this whole RHR technique confuses me so much and is so frustrating to visualize

anyone??????
15. ### Help with lenz's law

Homework Statement A small metel ring, as illustrated by the picture, is dropped into a region of constant magnetic field. For regions 1, 2 and 3, determine (a) whether the induced current is clockwise, counterclockwise, or zero (b) whether the magnetic force on the ring upward...
16. ### Question about sound frequency of an organ ?

so just assume n=1? Then I get the final answer to be square root (344/3) = 114.6 m/s does this look right??>
17. ### Question about sound frequency of an organ ?

your right, it should be a 2L...from the picture I determine the length to be 1.5...what do you think of this estimation? and how do I figure out what N equals??Thanx
18. ### Question about sound frequency of an organ ?

Question about sound frequency of an organ....? Homework Statement Based on this picture from the Jehmlich organ manufacturer in Dresden, Germany, estimate the frequency of sound produced by the organ pipe held by the man. Assume that the pipe is a tube open at both ends...
19. ### Question about sound intensity

Homework Statement the sound intensity level at a rock concert is 115 dB, while that at a jazz fest is 95 dB. By what factor does sound intensity increase? Homework Equations The Attempt at a Solution 115-95= 20 10log(rock/jazz)=20 log(rock/jazz)=2 Rock/Jazz=100
20. ### Question about microphone sound

Homework Statement One microphone is located at the origin, and a second microphone is located on the +y axis. The microphones are separated by a distance of D=1.5 m. A source of sound is located on the +x axis, its distances from microphones 1 and 2 being L1 and L2, respectively. The speed...