Physics - March 2007

The decibal level of an orchestra is 90dB, and a single violin ahcieves a level of 70 dB.
How do the intensity and volume of the sound of the full orchestra compare with those of the violin's sound.

( I am thorough confused)
I appreciate any help.

2007-03-26 13:57:36 · 5 answers · asked by Anonymous

2007-03-26 13:55:51 · 5 answers · asked by luv 2 1

If the distance from a point source of sound is tripled, by what factor does the sound intensity decrease?

(there are no nearby refelctions)
Thanks!

2007-03-26 13:43:31 · 2 answers · asked by Anonymous

If the wavelength of a sound source is reduced by a factor of 2, what happens to the waves frequency?

What happens to its speed?

2007-03-26 13:35:28 · 7 answers · asked by Anonymous

2007-03-26 13:28:54 · 2 answers · asked by Anonymous

So this is the problem:
You are riding on the Demon rollercoaster. At T=1 second going down the 2nd hill, your car is traveling at a speed of 2 m/s. After 3 seconds, your car reaches the bottom of the hill travelling at 5 m/s. What is your acceleration?

So far I have:
a= ?
vf=5 m/s
vi=2 m/s
Would T= 4 seconds, or 1 second or 3 seconds?

2007-03-26 13:25:15 · 3 answers · asked by Addicted To Abercrombie & Fitch 2

2007-03-26 13:24:47 · 1 answers · asked by Anonymous

2007-03-26 13:18:03 · 2 answers · asked by Anonymous

emitted. How does their combined energy compare with the energy of the single frequency that would have been emitted if the electron had dropped directly from the 4th level to the 1st?

2007-03-26 13:09:28 · 2 answers · asked by NoMoreBabydoll 3

Imagine if everybody had a few solar panels on their roofs, their balconies, their garages. And then imagine them feeding right into the phone network, simply because it's in place already, and people sending electricity to a location that's currently in the dark via the internet.
There, users would light their LED lamps with it (presuming a future now where your average household lamp consumes not 100W, but 3 or something).
Would that work?

2007-03-26 13:03:11 · 6 answers · asked by Tahini Classic 7

2007-03-26 12:52:58 · 3 answers · asked by Bunny.. 2

Can someone please explain how to determine the force of a person in term of their weight??? I really have tried, I cant seem to get it. Do I use F=ma and w=mg and replace m in the force equation with w/g??? I've tried everything and I dont think I quite understand what I'm looking for. Will someone please explain what it is the question is asking for? Thanks in advance!

2007-03-26 12:51:55 · 4 answers · asked by asdfk23 1

2007-03-26 12:50:18 · 10 answers · asked by Mylo884 1

this is a logic hw question, and no, i am not cheating, the teacher said we could use any help of any source, and i consider this a source. PLEASE HELP!!!

2007-03-26 12:36:31 · 8 answers · asked by Ha Ha Ha 1

2007-03-26 12:36:17 · 4 answers · asked by Jamie C 1

A hamster jumps onto an exercise wehel for a run. A few seconds later, the hamster is running in place with a speed of 2.2 m/s. Find the work done by the hamster to get the exercise wheel moving, assuming it is a hoop of radius .13m and 6.5g.

2007-03-26 12:21:13 · 4 answers · asked by Anonymous

2007-03-26 12:20:19 · 3 answers · asked by East Ender 2

I keep trying and trying but just cannot get the right answer!! Can someone please explain in simple terms how to find the answer for this problem-It should be 348 Newtons but that is NOT what i am getting!!


- A 30kg child is swinging at the end of a 5 meter long rope. The child is traveling at 3 m/s at the lowest point of its motion. Determine the tension in the rope at this point.

2007-03-26 12:20:14 · 2 answers · asked by Jane A 3

i'm doing a school extra credit project and the more volts u get the larger the extra credit

2007-03-26 12:15:10 · 5 answers · asked by goog 2

Two blocks are connected by a thin inextensible string
over a frictionless massless pulley. The acceleration of gravity is 9.8m/s^2


Given that the two blocks move at 3m/s under an
acceleration of 4.1 m/s^2, calculate the coefficient Mμk
of kinetic friction between the left block and the incline.

2007-03-26 12:05:32 · 4 answers · asked by KayJ 1

i need a name for my future software site.. can you help with an personal name.. i don't want to use a generic name like softwaredownload.com.. i need something easy to remember and personal name, never use in this category

2007-03-26 11:56:08 · 1 answers · asked by brlmnd 1

2007-03-26 11:55:55 · 1 answers · asked by quetions1 1

2007-03-26 11:42:24 · 3 answers · asked by Anonymous

I don't even understand these questions, I have for homework.
1)Many people mistakenly believe that the astronauts who orbit the earth are "above gravity." Calculate g for space shuttle territory, 245 kilometers above the earth's surface (dashed line in sketch). Earth's mass is 6x10^24 kg, and its radius is 6.38x10^6 m (6380 km). (b) Your answer is what percentage of 9.8 m/s2?
2)The intensity of light from a central source varies inversely as the square of the distance. If you lived on a planet only half as far from the sun as our earth, how would the light intensity compare with that on earth? How about a planet ten times as far away as the earth?

2007-03-26 11:35:05 · 1 answers · asked by Getmeoutofhighschool 2

2007-03-26 11:31:57 · 13 answers · asked by brlmnd 1

In a hydraulic brake system, the area of the piston in the master cylinder is 7 cm^2, and that of the piston in the brake cylinder is 1.5 cm^2. The coefficient of friction between shoe and wheel drum is 0.45. If the wheel has a radius of 30 cm, how large is the frictional torque about the axle when a force of 42 N is exerted on the brake pedal? Answer in units of N-m.

2007-03-26 11:26:51 · 1 answers · asked by Megan L 1

the bottom of a deep mine?
the elevation makes no difference at all?
sea level?
or the top of a very high mountain?

2007-03-26 11:15:13 · 2 answers · asked by Megan L 1

Two blocks, one 0.8 kg and the other 2.0 kg are connected by a massless string over a frictionless pulley. The coefficient of kinetic friction is 0.14, and the downward ramp angle is 60 degrees.

a) Determine the acceleration of the blocks.

b) Calculate the tension of the string.

2007-03-26 11:13:42 · 1 answers · asked by NeedHelp 1

Well I'm not an electrician or anything, but i was just curious about this since I noticed it.

I have a Fender 212R guitar amp, which is supposedly 100 Watts. Well I looked on the back by where the power cable plugs in and it said Input Power 360 W

So my question is, what happens to the other 260 watts here?

2007-03-26 11:07:36 · 3 answers · asked by Steven B 6

2007-03-26 11:02:03 · 2 answers · asked by SweetLady 1