Physics - November 2007

Assuming I have a lighting fixture which uses FOUR 500W halogen lamp.

Is it possible that the power rating of the lighting fixture be at 450W? or can the electrical power be summed up to 2000W?

If possible, please quote a source for your answer. Thanks.

2007-11-10 18:09:07 · 1 answers · asked by NoBeoKa 1

2007-11-10 18:03:33 · 3 answers · asked by nhik 1

2007-11-10 17:05:32 · 3 answers · asked by fuhgawz0 1

Where is the car when its radial acceleration is smallest?explain..
where is the car when its tangential accelerationis smallest?Explain.
When the car is at the top of the circle, is the acceleration larger than, smaller than, or the same as the acceleration of an object falling freely in a gravitational field?Explain.

2007-11-10 16:09:24 · 1 answers · asked by Anonymous

If someone spiked a volleyball over the net, and someone bumped the ball, would that be considered transferring momentum when the ball makes contact with the passer's arm?

2007-11-10 15:22:03 · 3 answers · asked by Anonymous

A spring is hung from the ceiling. When a block is attached to its end, it stretches 2.0 cm before reaching its new equilibrium length. The block is then pulled down slightly and released.

What is the frequency of the oscillation?

2007-11-10 15:13:44 · 1 answers · asked by Nick S 1

A 1580 kg car moving south at 13.3 m/s collides with a 2380 kg car moving north. The cars stick together and move as a unit after the collision at a velocity of 5.16 m/s to the north. Find the velocity of the 2380 kg car before the collision.

________m/s to the south

2007-11-10 14:47:58 · 7 answers · asked by Anonymous

A railroad freight car weighing 285 kN and traveling at 1.50 m/s overtakes one weighing 214 kN and traveling at 0.912 m/s in the same direction. The cars couple together.
Find the speed of the cars after collision.

_________m/s

2007-11-10 14:43:03 · 1 answers · asked by Anonymous

2007-11-10 14:11:29 · 1 answers · asked by DENISE C 1

Can anyone explain to me, in a physics standpoint, why there is not a falling sensation, similar to that felt on a roller coaster, when a jumper exits the plane just before terminal velocity is achieved? If at all possible I'm looking for a technical answer...college level physics answer.

2007-11-10 13:30:05 · 1 answers · asked by jguyot786 2

Doesen't energy(light) plus dirt equal us?Like when our energy leaves we turn into dust(or dirt). So we aren't just our physical brain we are also that energy because with out energy our vessel dies.

Just really think on this and then answer.

So in evolution where did the energy come from when the planet was all dirt before life started.

We had to come from dirt or some part of the planet.

When we eat the food transformes to our body.

Plants eat dirt , we eat plants so why coulden't a God make us from dirt with the breath of life(energy)?

2007-11-10 12:53:25 · 4 answers · asked by Anonymous

Doesen't energy plus dirt equal us?Like when our energy leaves we turn into dust(or dirt). So we aren't just our physical brain we are also that energy because with out energy our vessel dies.

Just really think on this and then answer.

So in evolution where did the energy come from when the planet was all dirt before life started.

We had to come from dirt or some part of the planet.

When we eat the food transformes to our body.

Plants eat dirt , we eat plants so why coulden't a God make us from dirt with the breath of life(energy)?

2007-11-10 12:25:46 · 22 answers · asked by Anonymous

balls mass?

2007-11-10 11:57:09 · 2 answers · asked by interesting news 1

Me and a couple of friends have been on a subject. Time. Whether time can be controlled is almost answered. After years of research and what took scientist years to figure out, took us only days. The riddle that has been sitting in our mind for years is now so close to bieng answered.

2007-11-10 11:42:56 · 3 answers · asked by William A 3

A box of mass M is attached to a string and is pulled with a force F along a rough surface having a coefficient of kinetic friction of KF. If the tension in the string is doubled, what will happen to the radial and tangential components of acceleration?

2007-11-10 11:26:13 · 3 answers · asked by zircon 2

A ball is attached to a flexible cord and swung in a horizontal circle. The angle between the cord and the horizontal is less than 45°.
(i) Which is larger, the horizontal force or vertical component of the tension force?
(ii) Which is larger, the vertical component of the tension force or the gravitational force?
(iii) Is the acceleration of the ball larger than, smaller than or the same as the acceleration of a ball falling freely in a gravitational field?

Please explain each. Thanks.

2007-11-10 11:10:19 · 1 answers · asked by zircon 2

Question was:
A fisherman and his young nephew are in a boat on a small pond. Both are wearing life jackets. The nephew is holding a large floating helium filled balloon by a string. Consider each action below independently, and indicate whether the level of the water in the pond R-Rises, F-Falls, S-Stays the Same, C-Can't tell. (If in the first the level Rises, in the second it Falls, and for the rest one Cannot tell, enter RFCCCC)

A) The nephew pops the balloon.
B) The nephew gets in the water, looses his grip on the string, letting the balloon escape upwards.
C) The fisherman lowers himself in the water and floats.
D) The fisherman fills a glass with water from the pond and drinks it.
E) The fisherman knocks the tackle box overboard and it sinks to the bottom.
F) The fisherman lowers the anchor and it hangs vertically, one foot above the bottom of the pond.

I answered SRRSRR
What did I say wrong? Am I being naive somewhere??

2007-11-10 10:16:49 · 13 answers · asked by amazin_woman2001 3

2007-11-10 09:27:52 · 8 answers · asked by FuMan 2

2007-11-10 09:05:12 · 2 answers · asked by Anonymous

if the earth is spinning, shouldnt we feel the centrifugal force.
at the equator, the centrifugal force would act in the opposite direction to the centrifugal force, so you wouldnt feel it there, but what about, say,the north pole.

i understand that we wouldnt feel any force if the earth was moving in a straight line at a constant speed, but when something moves in a circular way there is always a force

2007-11-10 08:45:40 · 5 answers · asked by John M 1

I have a project due on Tuesday, so if anyone knows anything about argon in history it would be great! If anyone is a teacher, espically science, it would also be great! Thank you so much! Please answer ASAYC, (as soon as you can)!

2007-11-10 07:41:16 · 1 answers · asked by keithurbanrox! 2

divers "air bottles" or astronauts backpack.i mean what is exact mixture inside?
sorry for my bad english :)))))

2007-11-10 07:07:59 · 2 answers · asked by mladen m 1

The Sun emits electromagnetic waves (including light) equally in all directions. The intensity of the waves at the Earth's upper atmosphere is 1.4 kW/m^2. At what rate does the Sun emit electromagnetic waves? (In other words, what is the power output?)

2007-11-10 06:43:59 · 1 answers · asked by Jerry M 1

A pendulum of length L1 has a period T1 = 0.9 s. The length of the pendulum is adjusted to a new value L2 such that T2 = 1.1 s. What is the ratio L2/L1?

2007-11-10 06:37:04 · 2 answers · asked by Anonymous

Could someone please explain how to solve the following problem? Thanks.

A baseball player running at 9.5 m/sec between bases decides to slide the remaining 3.2 meters into home plate. If the mass of the baseball player is 75 kg, calculate

(a) the force of friction
(b) the coefficient of friction

2007-11-10 06:32:25 · 1 answers · asked by labelapark 6

2007-11-10 06:30:49 · 1 answers · asked by (ƸӜƷ) 1

How do I solve the following problem? Could someone please provide an explanation instead of giving me a number? Thanks.

A boy on a bicycle is pedaling along a straight and level road at 26.30 km/hr. When he stops pedaling he finds that he can travel a distance of 150 meters before stopping. Find

a. his speed in m/sec when he stops pedaling
b. his acceleration while coasting
c. the coefficient of sliding friction

2007-11-10 06:26:06 · 1 answers · asked by labelapark 6

A sound wave with intensity 25 mW/m^2 interferes destructively with a sound wave with intensity 28 mW/m^2. What is the intensity of the superposition of the two?

2007-11-10 06:19:15 · 3 answers · asked by Anonymous

2007-11-10 05:47:23 · 6 answers · asked by Adina G 2

1) What is the vertical and horizontal components?

2) How long was it in the air?

3) What was its maximum height?

4) How far did the projectile go?

2007-11-10 05:26:48 · 1 answers · asked by Anonymous