Physics - February 2007

Say the voltage of the house went from 120volts to 108 volts. What would be the power consumed by a 100 watt bulb (that is, a lightbulb that consumes 100watts when connected to 120volts).

2007-02-22 08:52:14 · 5 answers · asked by Sir Guitarist 2

Help,

Tomorrow in physics I need to have invented a device of some sort to cushion an egg dropped from about 20 feet. I can use anything I want. The big stipulation is I can't use anything like a parachute (meaning it has to accelerate to the ground at 9.8 m/s^2 !!)

Help!

2007-02-22 08:49:04 · 12 answers · asked by Anonymous

There are three lightbulbs and are set up like this:
** _____lightbulb a______________
__|__*************** | **************|
* __**************bulb b****lightbulb c
***|_______________|___________|

What happens to the brightness of the remaining bulbs if A was removed and replaced by a wire? B was removed? If B was replaced by a wire.

Thank you all for helping me understand this! A medical student aren't smart in this stuff!

2007-02-22 08:12:55 · 3 answers · asked by Sir Guitarist 2

What if you maintain 100 mph straight up. Given enough fuel and time (and the right ship), could you escape the earth's gravity?

2007-02-22 08:07:52 · 9 answers · asked by Anonymous

To demonstrate standing waves, 1 end of a string is attached to a tuning fork w/ frequency 120Hz. The other end of the string passes over a pulley & is connected to a suspended mass M. The value of M is such that the standing wave pattern has 4 "loops." The length of the string from the tuning fork to the point where the string touches the top of the pulley is 1.20m. The linear density of the string is 1.0x10-4 kg/m, and remains constant throughout the experiment.
(a) Determine the wavelength of the standing wave.
(b) Determine the speed of the transverse waves along the string.
(c) The speed of the waves along the string increases w/ increasing tension in the string. Indicate whether the value of M should be increased or decreased in order to double the # of loops in the standing wave pattern. Justify ur answer.
(d). If a point on the string at an antinode moves a total vertical distance of 4cm during 1 complete cycle, what is the amplitude of the standing wave?

2007-02-22 08:06:21 · 3 answers · asked by Anonymous

One thing I had difficulty with in my Physics degree was the Coriolis acceleration, and its related force and effects.
Anyone know of a good book or website which explains this clearly to the LAYPERSON?
Any knowledge you have yourself would also be appreciated.

2007-02-22 07:51:41 · 5 answers · asked by andrew m 3

A battery is connected to a network of resistors and capacitors. What happens to the energy supplied by the battery? I need some help understanding this concept!

2007-02-22 07:49:32 · 6 answers · asked by Sir Guitarist 2

We all know this.... i just want to know the physics behind this everyday action

How can we easily balance ourselves (stay upright) on a moving bicycle (or bike) but the same thing is impossible when a try on a stationary two-wheeler?

2007-02-22 07:36:37 · 12 answers · asked by rEdshiFt 2

2007-02-22 07:17:59 · 5 answers · asked by STORMY K 3

2007-02-22 07:12:44 · 5 answers · asked by Bao Wow 3

Please can answers be lengthy but simply

2007-02-22 07:09:33 · 2 answers · asked by PH 2

I have a page essay due on tides and I need some help.
If U know anything that's great. I need some info.

2007-02-22 07:07:49 · 3 answers · asked by Mrs. Tasha Bieber 2

One of the fundamental postulates of General Relativity is the Principle of Equivalence, which states that it is impossible to distinguish, by any physical means, between the effects of acceleration and the effects of a gravitational field... since we cannot distinguish between the effects, is it a reasonable leap to say that they could be regarded as the same or is there some important difference that makes them unique from one another?

I know it hardly makes sense, but I cannot seem to make myself understand why they would be regarded as different things at all... can somebody please clear this up for me?

2007-02-22 07:05:22 · 3 answers · asked by jason 2

2007-02-22 06:57:06 · 1 answers · asked by bob b 1

2007-02-22 06:40:28 · 9 answers · asked by Tony P 1

2007-02-22 06:28:51 · 5 answers · asked by angelof2004@sbcglobal.net 1

2007-02-22 06:22:42 · 5 answers · asked by angelof2004@sbcglobal.net 1

A pacemaker sends a pulse to a patient's heart every time the capacitor in the pacemaker charges to a voltage of 0.20 V. It is desired that the patient receive 66 pulses per minute. Given that the capacitance of the pacemaker is 110 µF and that the battery has a voltage of 9.0 V, what value should the resistance have?

I think I keep solving for R wrong. The time should just be 66/60, right?

2007-02-22 06:22:28 · 3 answers · asked by ANT-a-gonistic 3

this is for a science project today in class

2007-02-22 06:20:14 · 5 answers · asked by angelof2004@sbcglobal.net 1

I have never had a watch that lasted more than a few weeks. I have tried analog and digital, but kill both kinds. Sometimes they speed up or start jumping ahead time-wise before they stop completely. I suffered a severe electric shock as a child and wonder if this could be related to my "timeless" problem.

2007-02-22 06:14:58 · 4 answers · asked by Sybbilla 1

Which one of the following frequencies of a wave in the air can be heard as an audible sound by the human ear?

A- 0.10 Hz
B- 10 Hz
C- 1,000 Hz
D- 100,000 Hz

2007-02-22 05:55:52 · 4 answers · asked by Anonymous

Man made.

2007-02-22 05:52:51 · 17 answers · asked by Nexus 1

Into some kind of storage device.

2007-02-22 05:46:18 · 5 answers · asked by Nexus 1

electric field lines emitted by a charge are infinite then why does GAUSS theorem say electric flux related to a closed surface
having charge q inside it =q/epsilonzero

2007-02-22 05:31:08 · 4 answers · asked by RAM KRISHNA MISHRA 1

Since air has particles constantly colliding with each other, why can't we feel the collisions? Why don't the collisions in the air make regular stationary objects move around too?

Is it because they are not high energy? Does it have something to do with elastic/inelastic collisions?

2007-02-22 05:25:32 · 2 answers · asked by antheia 4

I really still need help...please answer these questions and explain them.

1. In an electric field, 0.90 joule of work is required to brin 0.45 coulomb of charge from point A to point B. What is the electric potential difference between points A and B?

2. Two protons are located one meter apart. Compared to the gravitational forceof attraction between the two protons, the electrostatic force between the protons is
(1) stronger and repulsive
(2) weaker and repulsive
(3) stronger and attractive
(4) weaker and attractive

3. If 4.8x10^-17 joule of work is required to move an electron between two points in an electric field, what is the electric potential difference between these points?

4. A motor used 120 watts of power to raise a 15 newton object in 5.0 seconds. Through what vertical distance was the object raised?

thank you

2007-02-22 05:09:10 · 1 answers · asked by Anonymous

What does the -1 mean?

See example:
http://www.mishkas.com/inc/img/ms.JPG

2007-02-22 04:47:36 · 3 answers · asked by pottolom 1

In physics and engineering, what does it mean when a letter in a formula has a dot above it? e.g. in a formula with "m" denoting mass, it might have a dot above the m as in the link below:

http://www.mishkas.com/inc/img/m.JPG

2007-02-22 04:44:44 · 1 answers · asked by pottolom 1

Please answer and explain these questions.

1. A 1.5 volt, AAA cell supplies 750 milliamperes of current through a flashlight bulb for 5.0 minutes, while a 1.5 volt, C cell supplies 750 milliamperes of current through the same bulb for 20 minutes. COmpared to the total charge transferred by the AAA cell through the bulb, the total charge transferred by the C call through the bulb is what?

2. A 9 volt battery is connected to a 4 ohm resistor and a 5 ohm resistor in series. What is the current in the 5 ohm resistor?

3. In the diagram below, a positive test charge is located between two charged spheres, A and B. Sphere A has a charge of +2q and is located 0.2 meter from the test charge. Sphere B has a charge of -2q and is located 0.1 meter from the test charge.
X = test charge

A -------0.2m---------X-------0.1m----------B

thank you

2007-02-22 04:40:47 · 2 answers · asked by Anonymous

What exactly is time? We use it in physics equations and equations outside of physics, but what exactly is time? Did it ever have a finite begining? Will it have a finite end? or was it an infinite begining? and will it have an Infinite end?.... What is time?

2007-02-22 04:26:23 · 12 answers · asked by JPCarter 1