Recent content by studentmom

Thanks, but the information states the same thing that I already knew... the equation is the same, and it offers no explanation of how to figure out the actual frequency of the train's noise... ??

I have a question regarding the doppler effect and frequency: You (a stationary observer) are standing by the railroad tracks and hear a frequency of 1000 Hz as the train approaches... as the train goes away, the frequency changes to 800 Hz. Knowing that the speed of sound is 340 m/s, how...

just bumping up ... any ideas??

Homework Statement A ball with original momentum of +4.0 kg*m/s hits a wall and bounces straight back without losing any kinetic energy. The change in momentum of the ball is? Homework Equations p (momentum) = mv Impulse = change in p/change in t The Attempt at a Solution I...

Homework Statement an air bubble originating from a scuba diver at a depth of 18.0m has a diameter of 1.0cm. What will be the bubble's diameter when it reaches the surface? assume constant temperature Homework Equations I'm not sure what equation to use for this... The Attempt...

Thank you so much for your help!

no, the problem is stated as is, no lengths given...

how to find coefficient of kinetic friction... please?! I am lost on this question, hopefully someone can help: a 300 kg crate is placed on an adjustable incline and as one end of the incline is raised the crate begins to move downward; if the crate slides down the plane at an acceleration...

Thank you for your help... I knew what I needed to get, but I couldn't remember how to get there... I was having trouble with the easiest part, v=displacement/time... Once again, thank you for your assistance.

The problem states: A fireman is standing 50.0 m away from a burning building. He directs a stream of water from the fire hose at an angle of 30 degrees above the horizontal. If the initial speed is 40.0 m/s, at what height will the stream of water strike the building? I understand that...

I would appreciate any help if someone can just steer me in the right direction... please! Thanks again.

I have a homework problem that I can't seem to figure out... Hope someone can help me... Runner A is initially 4.0 miles west of a flagpole and is running with a constant velocity of 6.0 mi/h due east. Runner B is initially 3.0 miles east of the flagpole and is running with a constant...