Recent content by Knfoster

Thank you!

Homework Statement An object is placed 32.7 cm from the reflecting surface of a convex mirror having a focal length of -10.8 cm. Determine the image distance. Homework Equations IDK The Attempt at a Solution Could someone please tell me what equation I should use? Thanks!

Homework Statement A) Determine the image distance and image height for a 5-cm tall object placed 10 cm in front of a concave mirror having a focal length of 15 cm. B) Determine the image distance and image height for a 5-cm tall object placed 45 cm in front of a concave mirror having a...

Homework Statement A particle, with a charge +q and a mass, m, is inserted into an evacuated chamber. The chamber is placed between two parallel metal plates that are a distance d apart, and are connectd to the terminals of a power supply that provide V volts (one plate to the positive...

And is r going to be 2.17 micrometers?

but it doesn't say how much my charges are ionized by... should I just say they are + and - 1 ?

WEll... Could I use Coulomb's Law? I know it is compressing because the two charges would be attracted to each other and want to come closer... but I'm not really sure how to get the force from that.

Thank you!

Homework Statement A molecule of DNA is 2.17 micrometers long. The ends of the molecule becom singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 1.00% upon becoming charged. Determine the effective spring constant of the molecule...

Homework Statement A. Find the electrostatic force between a Na+ ion and a Cl- ion separated by 0.5 nm. B. Would the answer change if the sodium ion were replaced by Li+ and the CL ion by Br-?Explain. Homework Equations I believe you have to use Coulomb's Law...? F=k* [(/q1//q2/)...

Homework Statement A 60.5g piece of lead is at 18.6oC. If 328 cal of heat is added to the lead, what is its final temperature? Do not enter units. Homework Equations I was trying to use 328 as the Q value and solve for delta T Q=mCdelta T HOWEVER, this wasn't working. The...

Homework Statement An aluminum cup contains 217g of water at 21.2oC. A 404g sample of silver at an initial temperature of 80.8oC is placed in the water. A 41.0g copper stirrer is used to stir the mixture until it reaches its final equilibrium temperature of 25.7oC. Calculate the mass of the...

Homework Statement The active element of a certain laser is an ordinary glass rod 18.7 cm long and 1.33 cm in diameter. If the temperature of the rod increases by 78.5oC, calculate its increase in length. Calculate its increase in diameter. Calculate its increase in volume. Homework...

ok. Thank you, I have the answer now. You were a big help!

No I'm not sure what the relationship is between them.