Physics - October 2007

2007-10-05 23:13:59 · 22 answers · asked by Anonymous

molicular agitation tocreat heat energy-cause any condition like sterilty

2007-10-05 21:18:15 · 1 answers · asked by dwarakanathan cr rama 4

What will happen to metal containers that are filled with liquid or gas at high pressure if they are exposed to extreme cold or to a temperature above 120 degrees celcius? Why so?

Are containers filled with liquid or gas at high pressure, thermostats and thermometers influenced or affected by the effects of heat?

What effects cause the density of the air in a hot air balloon to change?

What is the name of the gas that bubbles in the dough to make the dough rise?

Mercury and alcohol are usually used in liquid-in-glass thermometers. Suggest why these liquids, instead of water, are used.

How is heat transferred between the polar bear and it's surroundings?

Both mercury and water are liquids at room temperature. Why is mercury a good conductor of heat, but not water?

What is a souldering iron used for? A souldering iron has an iron rod with a copper tip. Why is the tip made out of copper instead of iron?

Can heat be transferred by convection in solids? Why/why not

2007-10-05 20:46:57 · 3 answers · asked by Yuppy kid! =P Roxzzz.... 2

An aluminum cup of 200g contains 150g of water at 30 degrees how many cubes of ice at -14 degrees C must be added to the cup to lower the temp of water to 10 degrees C if each cube of ice weighs 10g?

2007-10-05 20:35:48 · 1 answers · asked by caniaskyouplease 1

A U.S. Patriot missile has a velocity of 1032 m/s. What is the velocity of the missile in miles per hour

2007-10-05 19:45:25 · 2 answers · asked by zahra 1

It is a question of Magnet.

2007-10-05 18:21:30 · 4 answers · asked by Kittu 1

What mathematics background is needed to thoroughly understand string theory?

2007-10-05 16:58:18 · 4 answers · asked by robert f 1

2007-10-05 16:40:38 · 9 answers · asked by Anonymous

2007-10-05 15:28:04 · 1 answers · asked by isabel l 1

You see, I have to build a device to project as many marbles as possible into a basin 12 in in diameter and 4 in high, that is placed 10 ft away from me. There is a limit of 60 seconds for me. I can only use one marble at a time, the device cant be hand-held. Now, I bought a Hot Wheesls V Drop Super Velocity Set: http://www.walmart.com/catalog/detail.gsp?image=http://i.walmart.com/i/p/00/02/70/84/30/0002708430781_AV_60X60.gif,http://i.walmart.com/i/p/00/02/70/84/30/0002708430781_500X500.jpg,http://i.walmart.com/i/p/00/02/70/84/30/0002708430781_AV_60X60.gif,http://i.walmart.com/i/p/00/02/70/84/30/0002708430781_AV1_60X60.gif&product_id=5691446&iIndex=2&isVariant=false&corpCard=false&type=0, and I used its track as a track for my marbles. The only problem is that I cannot make my marbles go 10 ft! AND, I tried every combination possible with height and weight of the track. Help or tips are welcome.

2007-10-05 14:26:55 · 2 answers · asked by inna2507 2

A broken leg is supported in the traction apparatus shown. If the hanging mass has a value of M = 23.5 kg, (a) what is the tension T1 in the rope, and (b) what is the total force F applied to the leg?

(a) T1 = 231 ± 3.0% N

(b) F = 399 ± 3.0% N

how do they get the answer for A

there is also a picture and here it is
http://img76.imageshack.us/my.php?image=traction0br9.jpg

2007-10-05 14:18:02 · 1 answers · asked by XLR8 2

What are (a) the charge and (b) the charge density on the surface of a conducting sphere of radius 0.14 m whose potential is 200 V (with V = 0 at infinity)?

Some work plesae, numbers, equations, etc.

2007-10-05 14:04:40 · 1 answers · asked by Anonymous

What is the magnitude of the electric field a the point (3.00i – 200j + 400k) m if the electric potential is given by V = 2.00xyz^2, V is in Volts and x, y, and z are in meters.

I'm lost need some work!

2007-10-05 13:58:59 · 1 answers · asked by KwadwoT 1

l velocity of the car? Answer in units of m/s.

b) How far does the car travel in this time interval? Answer in units of m.

2007-10-05 13:56:10 · 5 answers · asked by americasnextopfashiondesigner 2

2007-10-05 13:37:54 · 8 answers · asked by pretty36 1

Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 5.0 kg projectile from rest to a speed of 3.8 103 m/s. The net force accelerating the projectile is 4.6 105 N. How much time is required for the projectile to come up to speed?
____ s

2007-10-05 13:36:37 · 1 answers · asked by Antonio E 1

hydrogen was (or is) the initial element in the appearance of matter in the Cosmos? Has anybody postulated on how or why ('God doesn't throw dice' - Einstein) the first hydrogen atom (or its components) appeared out of 'nothingness' preceding the Big Bang, of couirse? I understand the religious implications of this question, but observe that 'everything' He did, seems to eventually prove logical and with a scientific basis.

2007-10-05 13:30:51 · 2 answers · asked by te144 7

A driver traveling at 59 km/h sees a chicken dash out onto the road and slams on the brakes. Accelerating at -7 m/s2, the car stops just in time 24.0 m down the road. What was the driver's reaction time (i.e., the time that elapsed before he engaged the brake)?

It's the last problem of my homework, and I just want to be done. Help appreciated!

2007-10-05 11:49:34 · 1 answers · asked by purplegrl28 4

Could it be the Microwave,Jet Engine.Computer,Mobile phone what is it on a scale 1to 10

2007-10-05 10:57:31 · 21 answers · asked by realdolby 5

The multi-meter M is a multi-mode measuring instrument capable to measure either voltage or current depending on its mode switch. part 1
What is the magnitude of the voltage shown by the multi-meter, when it is set in the voltmeter mode. Use the following data: ε = 12.0, R1 = 12.1 Ω, R2 = 39.7 Ω, R3 = 37.5 Ω, R4 = 14.5 Ω.
5.85 V - ans
second part
What is the magnitude of the current shown by the multi-meter, when it is set in the ammeter mode. ?

2007-10-05 10:52:27 · 1 answers · asked by Anonymous

2007-10-05 10:46:39 · 1 answers · asked by Anonymous

i know, a stupid question but i am just not sure.

thanks :)

2007-10-05 10:20:31 · 3 answers · asked by Elizabeth 3

a. alpha
b. beta
c. gamma

2007-10-05 10:20:12 · 3 answers · asked by Darly F 1

In one of Michelson's experiments, a beam from a revolving mirror traveled 14 km to a stationary mirror. How long a time interval elapsed before the beam returned to the mirror?

2007-10-05 10:07:25 · 1 answers · asked by w_rayas07 1

I need yet some more help with my physics. I'm looking to understand it, not just for an answer. Thanks in advance to anyone who can help explain how to solve this...

a UFO weighing 1.14*(10^4)kg is about to touch down on the moon, where the acceleration due to gravity is 1.6 m/s^2. At 165m above the surface, the downward velocity (it's moving straight down) is 18 m/s. what is the magnitude of thrust needed to reduce the velocity to 0 the instant the UFO touches down?

So far I'm pretty lost, except that I get that the 1.6m/s is going to be replacing the 9.8 standard here on Earth.

Thanks to anyone who can help me understand this.

2007-10-05 10:06:30 · 1 answers · asked by mr_peepers810 5

How long does it take for a pulse of laser light to reach the moon and bounce back to Earth?_______s

2007-10-05 10:06:30 · 2 answers · asked by w_rayas07 1

A person driving her car at 60 km/h approaches an intersection just as the traffic light turns yellow. She knows that the yellow light lasts only 2.0 s before turning to red, and she is 30 m away from the near side of the intersection (Fig. 2-29). Should she try to stop, or should she make a run for it? The intersection is 15 m wide. Her car's maximum deceleration is -6.2 m/s2, whereas it can accelerate from 60 km/h to 70 km/h in 3.0 s. Ignore the length of her car and her reaction time.
If she hits the brakes, how far will she travel before stopping?

________m

If she hits the gas instead, how far will she travel before the light turns red?

________m.

Sorry there is no picture!!! :(

2007-10-05 10:05:48 · 1 answers · asked by melon 1

A speeding motorist traveling 110 km/h passes a stationary police officer. The officer immediately begins pursuit at a constant acceleration of 10.2 km/h/s (note the mixed units).
(a) How much time will it take for the police officer to reach the speeder, assuming that the speeder maintains a constant speed?
_________s
(b) How fast will the police officer be traveling at this time?
_________km/h

2007-10-05 09:58:17 · 2 answers · asked by melon 1

2007-10-05 09:57:03 · 3 answers · asked by roososs 2

what is meant by second order? references please....

2007-10-05 09:54:43 · 2 answers · asked by babyCub 3