Recent content by Idioticsmartie

Speed of Sound and Mach Homework Statement You are hired as the physics consultant for a large movie studio. The producer is way over budget and wants to perform some special effects that will save him money. He decides to shoot the dramatic action boat chase scene with the boats going at 1/4...

Wait, sorry - is the velocity prime (aka after the collision) the same for both people and earth, since they become one object?

Great - thanks!

No, they're all in China. So I just need to find the velocity of the Earth afterwards. And figure out realistically if the center of mass changes during the collision, which it doesn't, because the Earth accelerates towards the people, doesn't it?

so the initial velocity of the people is 0, before they jump, right?

Homework Statement Let us say there are 2 billion people with an average mass of 50 kg. They all climb ladders which are 1 meter tall. At a particular instant they all jump off nd land on the ground simultaneously. This is an inelastic collision with the Earth. Assume the Earth does not move...

So, F = ma ma = (GmM)/r^2 Is this correct? Andn what mass do I put in for myself?

Homework Statement a) You are adrift in the solar system with no planet nearby and you are out at the same distance from the Sun as the Earth. What is the magnitude of acceleration due to the Sun's gravity you experience? Homework Equations Earth-Sun distance = 1.50 x 10^{11} M_{sun} =...

Alright, so with 2 sigfigs, it's 7600 N. :) Thanks so much for the help- I would've done badly on the homework otherwise!

so then where did the sq. rt part come from?

Okay, so: applied force = sq.rt of weight + frictional force? So that's 31.6227766 + 692.646 = 724.571 So if we account for significant figures, I get a grand, final answer *dum de dum* of 720 N? Why does it equal zero?

I'm afraid that your explanation only served to confuse me more. Why is it that the force moving the box up the plane is Fgx and not simply more than the friction force?

in my defense, there was no way to draw a straight line with the darn tool. I'm totally a mac over windows person, but in this case, I kinda vote for Paint.

Okay, so let me get this straight: The sum of the forces on the object are: The applied force (which is, as of yet, a mystery) Friction And the x-component of gravity. (Right? I need to verify this) So: Seeing as the applied force has to be greater than the friction force, do I...

But it's <x,y> and since the x-axes is parallel to the inclined plane, the yis negative. Sorry, I'm really slow at physics. But I don't quite understand why you need to factor in mg to the equation. The applied force has to be greater than the friction force in order for the box to move...