Recent content by platina

Is it possible to use a balance to measure the mass of a gas? Let's say that the experiment I'm going to describe is possible and takes place in a vacuum so as to avoid any buoyant force from the surrounding atmosphere, and the balloon to be used does not allow any effusion of the gas from...

A straw is in a glass of water. I then cover the top of the straw with my finger and lift the straw out of the water. The water stays in the straw. Is this correct?... The water in the straw falls ever so little because gravity pulls it down. The air pressure above the straw decreases...

Let's say it is 20 degrees Fahrenheit outside. If I have my thermostat set at 60 F, then each time my house dips below that temperature, my furnace should kick on and reheat it to 60 F. And the cycle continues... If I have my thermostat set at 68 F, then the scenario remains the same...

If there was no ramp and the car rolled on a horizontal surface at constant velocity, the ball would be caught, and I can clearly understand why. I'm confused with the scenario where the surface is not horizontal but angled with the horizontal as in the attached image. The third statement in...

I agree with that, but the image I've attached is from a video clip that I have. There is no motor on the car; it is released from rest.

In the image, the car is on an inclined plane, so it is accelerating down the plane.

Why does this work?? (X and Y independent) There is an image attached to refer to my question. A ballistics cart traveling at constant velocity can shoot a projectile straight into the air and the projectile will be caught in the car when it lands because of the independence of the X and Y...

Great responses. Thank you. You've definitely cleared it up for me.

Okay, I think I'm seeing it. So Person 2, by lifting it faster does do more work, but the extra work he does serves increases the KE of the mass, not overcome the work gravity does. Whereas, the work Person 1 does is used to overcome the work gravity does. For Person 1, the net work...

This is not HW, just something I was thinking about... Let's say two peole each lift a one kilogram mass from the floor to a height of 1.0 m off the floor. If both people lift with a force of 9.8 N, the masses are lifted at the same constant speed, each does the same amount of work and...

In the Ford F150 commerical that debuted during the Superbowl (), Ford says that it subejcted the tow hooks on the truck to 6g's of force. I timed the period of the truck during the portion in which the narrator is visible on the screen and got 1.80 seconds roughly. I read online that the...

That makes sense. Thank you. Sorry it took me so long.

So all particles hit the wall within that time increment of 2L/v, with some x-component of velocity?

I think so. Thank you. So the 2L/v establishes a unit of time, and then we go on to assume that 1/3 of the particles hit the wall during that time. So, we're looking at the average force of all particles (N/3) being applied during the to-and-from travel time of only one particle?

My question is with regard to the derivation for the kinetic theory of gases that allows us to relate temperature to the motion of the particles. I've looked at several introductory Physics texts and the same derivation is given (derivation in italics, my question in red, regular font): To...