Physics - June 2007

not a normal piece of string.

2007-06-28 08:02:12 · 23 answers · asked by techno mentalist 4

If black absorbs light and gets hotter, and white reflects light, then will aluminum foil keep the coolest?

If I have a black car, I know painting it white will make it get less hot. Will covering it with tinfoil keep it even cooler than white?

2007-06-28 07:54:14 · 6 answers · asked by Anonymous

So... plank units are the units we use when setting c=G=h bar=1. Got Ya! Is it just coincidence then that we can't resolve space beyond the plank length and can't resolve time beyond the plank time do to quantum affects? How does it happen to be that the plank mass is the mass needed to meet the criteria of the Schwarzschild black hole with a de Broglie wavelength equal to plank length?

How are these related to arbitrarily choosing c=G= h bar =1?

To better phrase my question: Are these units simply a consequence of setting g=h bar = c = 1 or are they defined by limitations to the resolvability of space-time.

Oh yeah...I have taken GR and QM but only at the undergrad level so far.

2007-06-28 07:36:59 · 5 answers · asked by kennyk 4

A) What was the initial speed of the arrow?
B) How long is the arrow in flight from launch to returning to the initial height?( assuming the arrow falls vertically downward.)

2007-06-28 07:21:35 · 6 answers · asked by Josh Muller 1

physics

2007-06-28 07:13:13 · 3 answers · asked by Ahmad a 1

A) checking units, B) saving your calculations,C) seeing if the answer is reasonable, or D) checking your results with another student.

2007-06-28 07:12:51 · 5 answers · asked by Josh Muller 1

A) What should she except the car's average gas mileage to be in kilometers per liter?
B) During the year there, she drove 6000km. Assuming that gas costs $5/gal in europe, How much did she spend on fuel? (compute to the nearest dollar.)

2007-06-28 07:10:00 · 3 answers · asked by Josh Muller 1

What formula would I use to determine force exerted by a rubberband when stretched a set length? All I know is the angle it is stretched and the distance.

2007-06-28 06:46:11 · 2 answers · asked by benzene boy 1

2007-06-28 06:26:08 · 7 answers · asked by Anonymous

and you fell in wearing all the nessacary equipment to survive the fall and you would be burned by the core.... would gravity fling you back and forth , what i mean is , after you pass the center due to momentum, when would you start falling the other way.

2007-06-28 06:16:36 · 9 answers · asked by Anonymous

Most Physics today concentrate on laser or software?

2007-06-28 06:02:57 · 4 answers · asked by Anonymous

2007-06-28 05:36:52 · 14 answers · asked by theadding 1

would radiation kill and ant before dog

2007-06-28 05:28:21 · 4 answers · asked by paul b 2

A 0.53 kg object, suspended from an ideal spring of spring constant 23 N/m, is oscillating vertically. How much change of kinetic energy occurs while the object moves from the equilibrium position to a point 4.7 cm lower?

2007-06-28 04:08:29 · 1 answers · asked by terra_flare_aqua_ciel 1

An ideal spring with a spring constant of 18 N/m is suspended vertically. A body of mass 0.60 kg is attached to the unstretched spring and released.

(a) What is the extension of the spring when the speed is a maximum?
_______meters

(b) What is the maximum speed?
_______m/s

2007-06-28 04:07:37 · 1 answers · asked by terra_flare_aqua_ciel 1

Two steel plates are fastened together using four bolts (the figure below ). The bolts each have a shear modulus of 7.8 1010 Pa and a shear strength of 5.7 108 Pa. The radius of each bolt is 1.0 cm. What is the maximum shearing force F on the plates that the four bolts can withstand?

2007-06-28 04:06:05 · 2 answers · asked by terra_flare_aqua_ciel 1

I'm tutoring a young lady in college level, algebra-based physics. The question asks her to find the total force applied on a diving board that is held in place by two mounts. The diving board is 5-meters long with a mass of 55 kg. The first mount is 3.4-meters from the water side of the diving board, the second mount is an additional 1.2-meters back (away from the water side). A person is standing on the edge of the board over the water, with a mass of 65 kg. The physics class has already studied the normal types of forces: gravity, Normal, friction (no friction is mentioned in the problem). This particular chapter is all about torque and inertia, so I'm sure the answer must include those. Any suggestions? Thanks!

2007-06-28 03:48:49 · 1 answers · asked by friendlyhelp04 6

I think I finaly found a question that doesn`t break the Y!Rules. Please look up the answer on Google and paste it here. Please remember this is Y/A so leave your brain at the door.

2007-06-28 03:29:54 · 18 answers · asked by Anonymous

An electric field, is always associated with a charge. Then, if photon, or light is a changeless particle, then what does the electric field component of the associated electromagnetic wave mean?

2007-06-28 03:22:52 · 3 answers · asked by Satheesh 2

Simple as that. Can nine volts of electricity kill you.

2007-06-28 03:21:34 · 4 answers · asked by Griff M 1

Simple as that. Can nine volts of electricity kill you.

2007-06-28 03:19:36 · 9 answers · asked by Griff M 1

Simple as that. Can nine volts of electricity kill you.

2007-06-28 03:08:01 · 9 answers · asked by Griff M 1

Simple as that. Can nine volts of electricity kill you.

2007-06-28 02:58:53 · 7 answers · asked by Griff M 1

i really need the answer

2007-06-28 02:20:24 · 4 answers · asked by Regine Yu 2

Initially at rest,an electron emerges from a potential difference of 100 kV with a speed comparable to the speed of light.

using relativistic mechanics what is the final speed of the electron

2007-06-28 01:55:20 · 3 answers · asked by walt 2

your thoughts? if so, when did the law come into effect? and why wasnt it in effect during or before the big bang?

2007-06-28 01:12:41 · 10 answers · asked by mrzwink 7

Again I stress - SPATIAL dimensions. Currently, physics considers reality as a matrix consisting of 3 dimensions of space and a 4th dimension of time. For this question, all dimensions involved are entirely spatial, not temporal. What technology do we have that might be able to touch upon such a concept? Any? Even just in theory?

2007-06-28 00:41:27 · 7 answers · asked by uncleclover 5

2007-06-28 00:19:03 · 2 answers · asked by Anonymous

2007-06-27 23:36:17 · 7 answers · asked by Anonymous

2007-06-27 23:19:12 · 1 answers · asked by Marivin R 1