Recent content by clarkandlarry

im asking that because i don't know what 'types' of wavelengths there are

the only equation in my notes with temperature in it is: (wavelength) x temperature = 0.002898mK i don't know how this relates to the question though

Homework Statement Does a blackbody at 200K emit twice as much total radiation as when its temperature is 100K? Homework Equations N/A The Attempt at a Solution I'm not sure, but I think it is yes because if the temperature is doubled, then the energy of the photons will be...

Is it because in UV light, the energy of the photons is much greater than the energy of photons in visible light? If so, why does the energy of the photons have anything to do with getting sunburn?

So it is because the lengths of the wavelengths are so small our ears are unable to detect the packets of energy? and what exactly do you mean by the "types" of wavelengths?

Homework Statement If electromagnetic radiation is made up of quanta, why don't we detect the discrete packages of energy, for example, when listening to the radio? Homework Equations N/A The Attempt at a Solution Does it have anything to do with the type of wavelengths or the...

Homework Statement UV light causes sunburn, whereas visible light does not. Explain. Homework Equations N/A The Attempt at a Solution I'm guessing that it might have sinething to do with the electromagnetic spectrum.

so to solve for v_1 would it be: 0 = (64 + 3.5)v_1 + 2.5(6) but once i solve for v_1, how would i set up the equation to solve for v_1-4?

I'm not exactly sure how to do that. I think it has something to do with E = 1/2 mv(squared), but that deals with energy and not work. Is this the equation that I should be using when getting U0,1 and U1,2 in terms of the same variables?

ok i got that part, but it says that the biology textbook is thrown with a speed of 4m/s "relative to the student." Wouldn't the student already be moving after throwing the first textbook?? therefore how would i calculate the velocity in terms of the speed of the textbook relative to the...

Homework Statement The speed of a particle doubles and then doubles again because a net external force acts on it. Does the net force do more work during the first or the second doubling? Justify your answer. Homework Equations I'm not sure, but i think E = 1/2 mv(squared) The...

Homework Statement A 64kg student is standing in the middle of a frozen pond with a frictionless surface while carrying 2 books, a physics book with a mass of 2.5kg and a biology book with a mass of 3.5kg. The physics book is thrown with a speed of 6m/s relative to the student to the right...

but how would i calculate the velocity of the person after he throws each textbook? i don't understand what equation (s) i would use.

So even though the spring is at rest, when you release it, the spring is no longer at rest, therefore the answer to the question is yes it is possible for parts of the system to be in motion at some later time. Is this right?

I'm not entirely sure what you mean by that. Are you saying that parts of the system are in motion at some later time?