Recent content by zellster87

Is the moles the number density divided by Avogadro's number? And how do i get the volume? I can't use the ideal gas law since i don't have temperature.

Homework Statement The number density in a container of argon gas is 2.00 X 10^25. The atoms are moving with an rms speed of 455 m/s. What is the pressure inside the container? Homework Equations V rms = sqrt( (3)(k)(T) / m) P = F/A = (1/3)(N/V)(m)(v^2 rms) The Attempt at a...

Homework Statement You see the boy next door trying to push a crate down the sidewalk. He can barely keep it moving, and his feet occasionally slip. You start to wonder how heavy the crate is. You call to ask the boy his mass, and he replies " 45.0 kg." From your recent physics class you...

i3 is simply equal to 1 amp. There is no need for a loop equation for Loop(i3). This also makes the problem easier to solve.

Your current source isn't equal to i3 - i4.

ah ok. Thanks for the reply.

Homework Statement A horizontal rope pulls a 10kg wood sled across frictionless snow. A 5.0kg wood box rides on the sled. The coefficient of static friction for wood on wood is mu = 0.5. What is the largest tension force for which the box doesn't slip? Homework Equations f(static) =...

Ah ok, I got it. Thanks dude.

Homework Statement You've always wondered about the acceleration of the elevators in the 101-story-tall Empire State Building. One day, while visiting New York, you take your bathroom scale into the elevator and stand on it. The scale reads 150 lbs as the door closes. The reading varies...

There is no friction invloved. What i typed, is exactly, and everything the problems gives. Their not looking for a numerical answer. Something like 0.5d or 0.25d or something.

Homework Statement A block pushed along the floor with velocity V0 slides a distance D after the pushing force is removed. If the mass of the block is doubled but its initial velocity is not changed, what distance does the block slide before stopping? Express your answer in terms of D...

Ah, it finally makes sense. Thanks for your reply, it really helped. On part b i left out part of the question on accident. It said that "Suppose someone drops an apple from a vertical distance of 6.0 meters, directly above the point where the arrow hits the tree." How long after the...

Thanks for your response,but I still can't get it. With the equation x = Vcos(theda)t there is 2 unknowns, time and velocity. I don't understand how to manipulate the equation so my info fits. Thanks for your time.

Homework Statement Hi, I have been working on this problem for a while, and cannot figure it out. Heres the question. An arrow is shot at an angle of theta = 45 degrees above the horizontal. The arrow hits a tree a horizontal distance D = 220m away, at the same height above the ground as it...

Homework Statement This problem has really been bugging me, and i can't seem to figure it out. Heres the question: Nicole throws a ball straight up. Chad watches the ball from a window 5.90 m above the point where Nicole released it. The ball passes Chad on the way up, and it has a speed...