Physics - July 2007

why is massive tripod preferred by most photographers

2007-07-19 02:50:23 · 2 answers · asked by Suzette 1

The pendulum has an adjustable screw on the lower end. Which way do I turn it to make the clock tick fasted? I am thinking lowering the pendulum so whick way is lower??

2007-07-19 01:47:30 · 6 answers · asked by jeanrad13 1

2007-07-19 01:46:59 · 14 answers · asked by Tosh 1

Is 55db noise level louder than a bath shower, or toilet flushing sound? Can you give another example like a air conditioner, or TV at half volume from 3 feet away?

2007-07-19 01:46:35 · 5 answers · asked by wernerslave 5

2007-07-19 01:37:32 · 5 answers · asked by ExpERT. 3

We know that a sine signal ca pass but for square signals
we have before to tranform them in sine ones

2007-07-19 00:04:27 · 3 answers · asked by chany 6

2007-07-18 23:06:36 · 8 answers · asked by chol B 1

2007-07-18 23:04:09 · 2 answers · asked by Vienna 3

Is it possible for a body to have an acceleration more than 299,792,452 metre per second square?

2007-07-18 22:56:33 · 6 answers · asked by Anonymous

if i have a 100% insulator...it wont show properties of attraction/repulsion isnt it?

2007-07-18 20:44:59 · 2 answers · asked by Anonymous

2007-07-18 19:09:30 · 6 answers · asked by i-sena 1

A stopwatch measure the stone's trajectory time from the top of the cliff to the bottom to be 2.5s. What is the height of the cliff? ( Assuming gravitational acceleration is 9.8m/s^2)
A) 25m
B)19m
C)12m

2007-07-18 18:22:23 · 5 answers · asked by Anonymous

Two seconds later it drops a second package. How far apart will the two packages land on the ground?
A)162m
B)177m
C)67.7m
D)283m

2007-07-18 18:13:58 · 5 answers · asked by Josh Muller 1

A) by a standard metal bar kept in paris, France
B) by a platinum bar kept in the National Bureau of standard
C) as of the distance from equator to pole

2007-07-18 18:06:54 · 3 answers · asked by Josh Muller 1

Are there any fantastic jobs out there? Probably in the field of physics?

2007-07-18 17:39:28 · 5 answers · asked by hectexheat 1

Within the last week Bekki B was selected by “Voters” for ten (10) “Best answers” sequentially (#1 being most recent) as follows:

Bekki # Votes to Closest Answerer # Votes:

1. 9 to 8
2. 10 to 9
3. 9 to 7
4. 9 to 8
5. 9 to 8
6. 9 to 8
7. 9 to 8
8. 9 to 8
9. 11 to 9
10. 3 to 2

This information is easily verifiable and I recommend you do so. Keep in mind that this data excludes Bekki’s “Best” when selected directly by the Asker or when she was the only answerer. The quality of her answers range from nonsensical to well-written without a significant deviation in this pattern of voting.

What are the statistical odds of always beating out the next nearest answerer by 1-2 votes? Is cheating acceptable to enhance status here? Is it o.k. or funny to cheat other answers out of being selected who worked hard to provide a good answer choice? Do some people take the imaginary points awarded here too seriously?

2007-07-18 16:45:07 · 11 answers · asked by Anonymous

Tsunamis are fast-moving waves often generated by underwater earthquakes. In the deep ocean their amplitude is barely noticable, but upon reaching shore, they can rise up to the astonishing height of a six-story building. One tsunami, generated off the Aletian islands in Alaska, had a wavelength of 623 km and traveled a distance of 3160 km in 5.23 h.

2007-07-18 16:11:55 · 3 answers · asked by adrianterrellhogan 1

If we send a space craft to another planet and leave it there does that reduce the mass of the earth and thus reduce the gravity of the earth and thus reduce the weight of everything on the earth?

2007-07-18 16:11:37 · 6 answers · asked by BillD 3

Due to a tune-up, the efficiency of an automobile engine increases by 5.45%.

2007-07-18 15:59:23 · 2 answers · asked by adrianterrellhogan 1

a space heater, operating from a 120V line has a hot resistance of 14ohms. at what rate is electrical energy turned into heat, and how much will it cost to operate it for 6 hours at $0.13/kWh

2007-07-18 15:55:51 · 2 answers · asked by Kel 1

When a 100 ohm resistor is connected to a battery, the terminal voltage is 30.6 V. When a 50 ohm resistor is connected the value is 29.4 V. What would the potential be with an open circuit at the terminals?

2007-07-18 15:45:12 · 6 answers · asked by Anonymous

Initially, the translational rms speed of a molecule of an ideal gas is 460 m/s. The pressure and volume of this gas are kept constant, while the number of molecules is increased by a factor of 6.

2007-07-18 15:37:54 · 2 answers · asked by Anonymous

On the surface of a hypothetical planet X, the atmospheric pressure is 9.72 x 10^6 Pa, and the temperature is 702 K. On the earth's surface the atmospheric pressure is 1.00 x 10^5 Pa, while the surface temperature can reach 320 K. These data imply that the planet X has a "thicker" atmosphere at its surface than does the earth, which means that the number of molecules per unit volume (N/V) is greater on the surface of planet X than on the earth.

2007-07-18 15:23:30 · 2 answers · asked by Tam 1

2007-07-18 15:22:37 · 3 answers · asked by pkul2007 2

Deliberately getting run over?

1. Check out the following video, is it for real?

2. Approximately, how much weight was applied?

3. Would you imagine that the driver felt a bump?

http://www.youtube.com/watch?v=K1OtLgfMv_g

2007-07-18 15:08:02 · 2 answers · asked by Yin, Mandy 2

inside a conducting spherical shell (b). The shell has inner radius 1.7 cm, outer radius 4.2 cm, and a net charge 25.9 pC.
Q' = charge on inner surface of shell
Q'' = charge on outer surface of shell
Find:
a) Q''
b) magnitude of electric field of a point P midway between the sphere and the inner part of the shell
c) potential of P assuming potential at r = infinity is 0

This is what I've done:
a) Q'' = Q_a + Q_b = (-1.6 pC) - (25.9 pC) = -27.5 pC

b) E = Q_a/((4)(pi)(r^2)(e_0))
r = (r_a + r_b)/2 = ((0.6 cm) + (1.7 cm)) = 1.15 cm = 0.0115 m
E = (-1.6E-12 C)/((4)(pi)((0.0115 m)^2)(8.85E-12 C^2/Nm^2)) = -3.996E2 N/C

c) V = V_p - V_c
V_c = outside of shell
r_p = radius of P
r_c = outside radius of shell
V_p = V + V_c
V = -(k)(Q_a)(1/r_p)(1/r_c)
V_c = (k)((Q_a) + (Q_b))/(r_c)
V_p = -(k)(Q_a)(1/r_p - 1/r_c) + (k)((Q_a) + (Q_b))/(r_c) = (8.988E9 Nm^2/C^2)(-1.6E-12 C)(1/(0.0115 m) - 1/(0.042 m)) + (8.988E9 Nm^2/C^2)((-1.6E-12 C) + (25.9E-12 C))/(0.042 m) = 6.108 V
But the units don't add up

2007-07-18 13:44:56 · 3 answers · asked by Anonymous

Judy places 0.150 kg of boiling water in a thermos bottle. How many kg of ice at -12.0 C must Judy add to the thermos so that the equillibrium temperature of the water is 75C?

2007-07-18 13:34:55 · 2 answers · asked by Anonymous

2007-07-18 13:22:02 · 8 answers · asked by ? 1

i cant seem to understand this question; i tried it many times but still cant seem to get it.

a bat uses echolocation to find insects. waves can only be used to detect objects that are one wavelenghth long or greater. if the bats echolocation is to be able to detect an insect that is 0.450 cm long on a night when the temperature is 15 degreed celcius, what must be the frequency that it uses to locate the insect? (Hint: some bats use frequencies as high as 150 kHz)

how do i do this? please help!!

2007-07-18 12:43:55 · 2 answers · asked by sweetheart 2

"2 magnets of equal size repulse one another at a constant velocity that is relative to their mass. Remember, the force of gravity is very weak, and in fact, magnets of any size are capable of exceeding it temporally."


This person is claiming that half mile long magnets will push a vehicle into orbit.

??

2007-07-18 11:16:25 · 4 answers · asked by tjcsonofallnations 3