Physics - December 2007

A cylinder contains 270 L of hydrogen gas (H2 at 0.0°C) and a pressure of 10 atm. How much energy is required to raise the temperature of this gas to 25°C?

2007-12-04 06:34:07 · 2 answers · asked by Eli D 1

If an FM radio station is emitting 81.7 kW in its 82.6-MHz radio wave, how many photons is it emitting each second?

2007-12-04 06:22:04 · 2 answers · asked by ??? 2

If a 12 pound ball is dropped and attains a velocity of 8.8 ft/s 3.0 seconds whats is the mass of the ball "note the gravity is different then earths and its not given"

2007-12-04 06:06:29 · 3 answers · asked by Anonymous

Suppose that 0.83g of water condenses on a 85.0-g block of iron that is initially at 24 degrees C.

If the heat released during condensation goes only to warming the iron block, what is the final temperature (in degrees C) of the iron block? (Assume a constant enthalpy of vaporization for water of 44.0 Kj/mol)

2007-12-04 05:59:24 · 1 answers · asked by Anonymous

In a ballistics test, a 21.0 g bullet traveling horizontally at 1300 m/s goes through a 30.0 cm -thick 450 kg stationary target and emerges with a speed of 900 m/s. The target is free to slide on a smooth horizontal surface.

How long is the bullet in the target?

______s

What average force does the bullet exert on the target?

______N

What is the target's speed just after the bullet emerges?

______m/s

2007-12-04 05:54:17 · 3 answers · asked by Anonymous

2007-12-04 05:36:48 · 3 answers · asked by leo s 1

Gravity bends light, i know that thats true, but how? if light cannot be slowed in a vacuum, how can it be bent without being slowed?

2007-12-04 05:21:13 · 3 answers · asked by Anonymous

the speed with which a body should be projected from the earth's surface in order to reach an infinite distance is about 1.1*10^4 m/s.Estimate the speed of escape from the moon.
[(mass of earth)/(mass of moon)=81
(radius of earth)/ (radius of moon)=3.7]

2007-12-04 05:05:03 · 3 answers · asked by lp342 4

2007-12-04 04:10:23 · 4 answers · asked by allee010 1

(0.0002 microbar = 0.0002 millionths of an atmosphere.)

The sound of a nearby jet engine is typically 130 decibels referred to that sound pressure.What is the engine's sound pressure in bars(atmospheres)??

2007-12-04 04:04:24 · 1 answers · asked by Selim K 1

They might be very careful not to give away that they have time-traveled.

2007-12-04 03:45:26 · 5 answers · asked by Akilesh - Internet Undertaker 7

What are atoms are they in us or wat.

if I release the energy in me will I explode

2007-12-04 03:36:16 · 6 answers · asked by o0♥0o 1

2007-12-04 03:32:02 · 10 answers · asked by Anonymous

Suppose there is a right isosceles triangular wedge with the hypotenuse replaced by 1/4th the circumference of a circle of radius R.
l
l l
l l l
l l l l l
Now there is a block of mass M that we release from its top. How do u find the time in which it comes down i.e a height of R(wedge is fixed).

2007-12-04 03:24:56 · 3 answers · asked by outofthisworld 2

2007-12-04 03:11:02 · 2 answers · asked by allee010 1

2007-12-04 03:07:19 · 11 answers · asked by Yogi 2

that an unheated fish bowl/tank will be the same temp? I believe humidity plays a major role in the resulting temp of an unheated fish bowl/tank at room temp. For example, if room temp is 72 degrees this does not necessarily mean the water in an unheated bowl/tank will be the same, correct? I am trying to explain to someone that they need a tank heater to ensure a consistent temperature in a fish tank because ambient air temp doesn't necessarily translate into that being the temperature of the water.

2007-12-04 03:06:03 · 9 answers · asked by Finatic 7

is it possible for this matter to be in another dimesion thus creating a hard to measure or even detect happening.garry xxxxx

2007-12-04 02:58:39 · 9 answers · asked by G 5

A baseball is thrown at an angle of 25 degrees relative to the ground at a speed of 23.0m/s.If the ball was caught 42.0m from the thrower,how long was it in the air?how high was the tallest spot in the ball's path?

A quarterback throws the football to a stationary receiver who is 31.5m down the field.If the football is thrown at an initial angle of 40.0 degrees to the ground,at what initial speed must the quarterback throw tha ball for it to reach the receiver?What is the ball's highest point during its flight?

2007-12-04 02:51:34 · 1 answers · asked by aforte 1

The weight of your 1255 kg car is supported equally by its four tires, each inflated to a gauge pressure of 34.1 lb/in2.

What is the area of contact each tire makes with the road?

I keep getting confused on this one. Help is much appreciated. Thanks.

2007-12-04 02:12:41 · 3 answers · asked by lstntht 1

I know that physics is divided into the macro and micro versions, each with there own set of rules that don't apply to the other. What are the specific names of these two divisions, and why is it that we can't combine them into one huge division for physics. : /

2007-12-04 01:58:02 · 1 answers · asked by MXG 2

if it is, could you please describe the situation to me.

2007-12-04 01:52:08 · 11 answers · asked by blah 2

I now it has something to do with the moment of force but other than that, I'm confused.

2007-12-04 01:21:01 · 5 answers · asked by John P 2

2007-12-04 01:17:45 · 5 answers · asked by nemoz21 1

...will the car actually stop momentarily before moving backwards?

2007-12-04 01:12:59 · 7 answers · asked by Anonymous

A. diodes
B. protons
C. electrons
D. neutrons

2007-12-04 01:06:05 · 5 answers · asked by Anonymous

A 0.5kg stone on the end of a length of a string is whirled round in a horizontal circle, radius 2m on a level frictionless table. The stone moves at a constant speed of 7m/s.Calculate

(a) The stones acceleration, stating its direction,

(b) the tension in the string,

(c)the work done by the tension during ten revolutions, explaining your answer

I've attempted part a and b using a=v2/r and tension = mg, i dont know if im right in these 2 but i dont have any idea how to do (c).
Any help is appreciated.

2007-12-04 00:47:21 · 3 answers · asked by homosapien 3

A plane is to fly due noth, the speed of the plane relative to air is 200 km/h and the wind is blowing from west to east at 90 km/h. (a) in which direction should the plane head? (b) How was does the plane travel relative to the ground?

2007-12-04 00:43:02 · 1 answers · asked by ♥ 6

2007-12-04 00:39:05 · 7 answers · asked by Anonymous

2007-12-04 00:15:41 · 3 answers · asked by solex 1