Physics - November 2006

What mass of steam that is initially at 120°C is needed to warm 370 g of water and its 300 g aluminum container from 20°C to 50°C?

2006-11-11 08:05:49 · 2 answers · asked by rhondasumpter 2

2006-11-11 07:41:25 · 7 answers · asked by waltva 1

If i have a 12V Battery, a switch, and a lightbulb in a circuit and a voltmeter is connected aross the bulb..what would the potential difference be?

Also: I want to know that does voltmeter measure the volt of the battery (in this case) is giving/losing or does it measure the volt of the bulb?

2006-11-11 07:32:41 · 3 answers · asked by Anonymous

2006-11-11 06:51:12 · 2 answers · asked by Anonymous

to another, but not when moves from one part of a circular orbit to another?

2006-11-11 06:40:09 · 4 answers · asked by Isabel P 1

A lunch tray is being held in one hand, as the drawing illustrates. The mass of the tray itself is 0.160 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.00 kg plate of food and a 0.180 kg cup of coffee. Obtain the force T exerted by the thumb and the force F exerted by the four fingers. Both forces act perpendicular to the tray, which is being held parallel to the ground.

http://i21.photobucket.com/albums/b272/Cajunboiler/09_68.gif

Find F in Newtons, and T in Newtons.

Okay, Whenever I worked this problem out, I kept getting the wrong answer (homework site is telling me it's the wrong answer). I know this has to do with External Torques equally 0, but I don't know if I'm plugging the numbers in correctly. Torque = r (distance) x F (Force) x Sin(theta). It would be greatly appreciated if anyone could tell me what are the correct numbers to plug into the equation.

2006-11-11 06:39:19 · 3 answers · asked by Confused 1

doing a lab report on mass.

2006-11-11 06:38:26 · 6 answers · asked by madroxon 1

A device for training astronauts is designed to rotate the trainee in a horizontal circle of radius 11.5 m. If the force felt by the trainee is 7.18 times her own weight, how fast is she rotating in m/s?

Now express your answer in revolutions per second.

How would you solve this when not given her weight or mass?

2006-11-11 06:29:31 · 3 answers · asked by justinegunderson 1

2006-11-11 05:53:41 · 12 answers · asked by goring 6

There is a mass m1 attached to the center of the rod and a mass m2 attached to the outer end of the rod. The inner section of the rod sustains three times as much tension as the outer section. Find the ratio m2/m1

2006-11-11 05:45:47 · 2 answers · asked by Vanessa M 1

The accident occured on a rainy day, and the coeffient of kinetic friction was estimated to be 0.42. Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes. (why does the car's mass not matter?)

2006-11-11 05:30:15 · 4 answers · asked by Anonymous

Everything in physics that I'm reading lately seems to punch holes in the string theory. Is anyone working on a more plausible theory yet? Or is eveyone just intent on bashing the string theory?

2006-11-11 05:12:27 · 6 answers · asked by hottie 2

Could there have been many premorial masses floating around? would it then be many big bang theories and developing Universes? How do we assume that our Universe is the only structure?any proofs?

2006-11-11 05:11:05 · 8 answers · asked by goring 6

2006-11-11 05:05:12 · 3 answers · asked by goring 6

2006-11-11 05:00:08 · 2 answers · asked by goring 6

2006-11-11 04:52:19 · 13 answers · asked by goring 6

2006-11-11 04:48:12 · 12 answers · asked by goring 6

2006-11-11 04:39:20 · 3 answers · asked by goring 6

2006-11-11 04:26:34 · 4 answers · asked by goring 6

The 45 newton box hangs from a cord that passes over a frctionless pulley and attached to 130 newton box that is held on an incline. The answer is forty-nine degrees, but I need to show work to get credit for this problem and I do not know how to get to that answer even when my teacher gave all the students the answer. The coefficient of friction is .620.

2006-11-11 04:21:32 · 4 answers · asked by ehou 1

The 45 newton box hangs from a cord that passes over a frctionless pulley and attached to 130 newton box that is held on an incline. The answer is forty-nine degrees, but I need to show work to get credit for this problem and I do not know how to get to that answer even when my teacher gave all the students the answer. The coefficient of friction is .620.

2006-11-11 04:21:20 · 2 answers · asked by ehou 1

We know water is in the air we breathe. How can I show the breakdown of that?

2006-11-11 04:17:08 · 3 answers · asked by preacherman 1

Acceleration is defined as instantaneous rate of change of velocity.Since no motion is involved how could we define the above.

2006-11-11 04:02:18 · 14 answers · asked by Anonymous

show how the angle of deviation of a ray of light varies with the angle of incidence.

2006-11-11 03:58:06 · 3 answers · asked by brian_rambadan 2

http://en.wikipedia.org/wiki/Uncertainty_principle

2006-11-11 03:45:00 · 9 answers · asked by Seeker 4

the last word on gravity?

2006-11-11 03:41:47 · 11 answers · asked by Anonymous

How loud must a sound be (in dB) before a human can hear it?

2006-11-11 02:58:25 · 10 answers · asked by Rich 5

He could have been mad as a box of frogs for all we know ?

2006-11-11 02:56:31 · 22 answers · asked by Anonymous

2006-11-11 02:47:05 · 12 answers · asked by kaudoo1211@rogers.com 1

please help me

2006-11-11 02:44:36 · 5 answers · asked by Kanan M 1