Recent content by JumpinJohny

I am pretty sure in that in solving for the total energy, you just need to find the potential energy. Electric potential energy would be PE=qV. There is no charge stated in the problem, so I'm not sure where to go from there.

Homework Statement A flash attatchment for a professional camera stores energy in a capactior. When a picture is taken, all of the charge is converted to energy, and the capacitor is fully discharged. A.Assume the battery charging the capacitor is a 300V battery. When the light flashes, it...

You two never figured this one out. I'm assuming we could use the same concept for part B, except this time we'll solve for v on the kinetic energy side?

So it'd be 3*11=33 J then?

Ahhhh voltage my bad. So would the change in voltage be 3-(-7) then? So, 10?

But the velocity is not given, is it?

I'm having trouble figuring out how you solved for this problem. I understand that the kinetic energy would be equal to the potential energy, but I'm not sure how to solve for the potential energy :eek:

Is that correct?

Do you know what that conversion is?

Alright. p=mv, so then .005*650=3.25; so 3.25/2.505= 1.297. So 1.297 would be the new velocity?

Homework Statement A police siren produces a sound whose frequency range from 635Hz to 912Hz. When the police car is 220 meters from from the scene of an accident, the sirens blare at 75dB. How many decibels higher will the sound intensity be when the police car is 55m away? Homework...

Errrrr it's either energy or momentum. I think momentum.

I really don't know Al.

Homework Statement A pellet gun fires a bullet into a stationary block of wood that is attached to a spring on a frictionless surface. When the bullet enters the wood, it reamins inside, and the bullet and block enter into simple harmonic motion with amplitude = 11cm. The bullet ( m = 5g) was...

I don't understand how you arrived at the answer mgb_phys.