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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

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...
4. ### 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...
5. ### 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...
6. ### 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...
7. ### 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
8. ### 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...