Recent content by jcais

I am using an Excel document. It tells me to press F9 to make the waves move. The freq of the standing wave is easy to get. It is 3.15 seconds (the time it takes for an extreme to go back to an extreme). 1/3.15 = period. I am supposed to press F9 to move the traveling waves from one extreme to...

Is the period of a comination wave the same as the period of two traveling waves that make up this combination standing wave? I googled it, but found nothing as of yet concerning equal periods. Thank you for your time.

I googled it: In physics, buoyancy is an upward force on an object immersed in a fluid (i.e. a liquid or a gas), enabling it to float or at least to appear to become lighter. If the buoyancy exceeds the weight, then the object floats; if the weight exceeds the buoyancy, the object sinks. If the...

Hello, There are two bricks underwater. Brick A is closer to the surface and Brick B is further down below. Which Brick would be hardest to keep in place? I said Brick B because there is more pressure (H20) on it forcing it down + gravity. Brick A just has gravity and a little bit...

It makes sense now. Thank you everyone. Have a great weekend! :-)

Dangit! Thank you everyone. :redface:

I read about angular momentum on wikipedia.com. It states that a child sliding down a slide at constant speed would be in mechanical equilibrium but not in static equilbrium. Why? Is it because the child is not stationary? What kinds of forces are involved besides gravity and friction? Do...

Hello, I have a homework problem. I was wondering if you all get/got the same answer that I have: 1.9m. My friend got .6m and I don't know how. I tried working it out twice and still do not come up with .6m. Here it goes: 2 people are carrying a uniform wooden board that is 3.00 m long...

Wow thank you. You are very kind and helpful. I am going to look at my problem now. I have about 3 different sketches/equations to look at and see where I went wrong. I have to log off now b/c the lab is closing.

Can I get height from this equation? Will it be the r? Thank you for your assistance.

What do you mean by the final KE? The .5mv^2 on the second side of the ME eqn. I guess the final velocity of the object when it exits the field of the Earth and enters space. I guess I am wrong. The object must have infinite KE not final KE I suppose or a 0 KE. I don't know.

Hmmm.. I am really dumb, this I know. So, I am inferring that there is 0 final PE and 0 final KE from the posts above. I don't know why. So initial KE and inital PE are set to equal each other. And, I guess I will solve for (.27v) because there is 27% of the velocity. If I am right...

Why is the initial PE of the object 0? Is the final KE of the object a nonzero number? Thank you for your help. I also edited my message up there.:smile:

I do not know what escape velocity is. Does it happen when the object is not on the Earth's surface or when the object leaves the ozone layer/atmosphere and is in space? Thank you! **If a projectile is launched from Earth with a speed equal to the escape speed, how high above the Earth's...

Hello all, I was wondering if someone could please help me with a problem. It is regarding the law of universal gravitation, this time using conservation of mechanical energy. We know that F = GMm/R^2 **If a projectile is launched from Earth with a speed equal to the escape speed, how...