Recent content by *intheclouds*

Homework Statement in the photoelectric effect, if the frequency of the radiation is below a certain cutoff frequency, no photoelectrons are produced no matter how intense the radiation is. Why does this fact favor the particle theory over the wave theory? Homework Equations The...

I got it...and the computer said my answer is right, so I am good to go! Thanks to everyone who helped! =]

wow that actually helped a lot! thank you!

Ok thank you...I think I am just going to wait and ask my teacher. =]

Am I going to use the equation: v2=v02+2ax?? Then it would be 0=v02+2(-9.8)(2.8). Vo= 7.4 m/s Is that what you are looking for?

Homework Statement A 0.43 kg piece of putty is dropped from a height of 2.8 m above a flat surface. When it hits the surface, the putty comes to rest in 0.22 s. What is the average force exerted on the putty by the surface? Homework Equations F\Deltat=\DeltaP F\Deltat=mvf-mvi...

Wow. Thank you again. You are amazing...=]

Oh, so: .45kg(3.2-7)/.047??

so it would be: .45kg(-7+3.2)/.047??

Ok the change in p would be... (.45kg)(3.2m/s)-(.45kg)(7m/s)? Im not really sure if i could just use the numbers from the problem or if i had to change the velocities or if they were in the correct order...

OK I have 1 more question for today... Homework Statement A 0.45kg volleyball travels witha horizontal velocity of 3.2m/s over the net. You jump up an hit the ball back witha horizontal velocity 7 m/s. If the contact time is 0.047s, what is the average force on the ball? Homework...

Oh wow so I was really close with my first answer...It was just negative and I needed it to be positive! Thank you. =]

ok so in that equation you gave me: (.24kg)(0m/s)+(.24kg)(0m/s)=(.24kg)(v)+.24(v)?? Its all going to work out to be 0? I am really confused. I know you are trying so hard to help me, but I am lost... =]

Im not really sure. I think it is Neutons*second. I am pretty sure it is the impulse.

So, what would the 2.7 N*s be considered?