Recent content by NickAtNight

It would help if we could get him to write the two equations. To list the number of unknowns To determine if there are enough equations to solve for the unknowns To rearrange the equations to solve for the unknowns Then to give the results for the three conditions 1) fully elastic. 2)...

What is the initial kinetic energy of the car? What is the initial kinetic energy of the truck?

We you given any information to calculate frictional forces with? Which vehicle has Michelin All-weather tires? Is one of the roads iced up? One of the vehicles may have a higher velocity, but without any information on the forces slowing the vehicles, how can you calculate any distance?

Hmm, keep working on it. Did you write out your Kinetic Energy equation yet? How many variables do you have? How many knowns? How many unknowns? How many equations do you have?

Good point. It is distance not velocity that they asked for.

Good. Do you not have an equation for the conservation of the energy? Perhaps you should write out and apply this equation?

Very good. If it is fully elastic, what is the answer?

As in: m1(v1i)+m2(v2i)=m1(v1f)+m2(v2f)

So could not each vehicle rebound with exactly the same velocity they collide with but in the opposite direction? Why are you assuming the two objects become one object?

Well, how about we say that 'something' appears to have mass that we cannot observe that causes the galaxy rotation to be different from the observed mass.

Is there a non-paywalled version of this article? I believe they stated that the minimum pressure of the bubble is 1 Pa with a temperature of 4,000 K at its maximum expansion. Is that correct. The bubble then contracts, and at least initially should compress via the ideal gas law to a peak...

Interesting... Slow motion pistol shrimp attack hits 4,000 C!

So they are blowing up a bubble containing a stoichiometric mixture of ##H_2## and ##O_2##?

You are welcome. Oh, the SI system does not get off quite so easy either. If you weigh yourself on the bathroom scales and get 68 kg (150 lbs). This is also Force units. So ##kg_f## And the ##G_c## for the SI system is ##9.8 kg*m/kg_f/s^2 ## So ##kg_f = kg_m## If you step on the same...