Physics - May 2007

Thanks.

2007-05-02 14:27:14 · 4 answers · asked by questforanswers 3

What is the voltage drop across the tungsten filament in a 100-W light bulb? The resistance of the filament is 144 (Ohm) and a current of 0.833 (amps) is flowing through it.

The formulas I've learned so far are:
I= Q/t
V= E/Q
R= V/I

2007-05-02 13:42:58 · 3 answers · asked by Unanswered 1

I have heard that matter is highly concentrated energy. Is this true?

Is it possible for their to be sentient beings that are pure energy?

If so, could these beings be a possible explanation for spirits and ghosts, maybe even gods?

I am not putting forth this theory as what I beleive, because I don't. I just want to know if it is scientifically possible.

Peace,
Byron

2007-05-02 13:36:46 · 6 answers · asked by Byron A 3

If you place a glass test tube in water, you can see the tube. If you place it in soybean oil, you may not be able to see it. What does this indicate about the speed of light in the oil and in the glass?

2007-05-02 11:48:52 · 4 answers · asked by kid_2205 1

A. X ray
B. alpha particle
C. gamm ray
D. light wave
E. beta particle

2007-05-02 10:51:41 · 6 answers · asked by Anonymous

2007-05-02 10:45:27 · 1 answers · asked by Anonymous

A uniform bar of length 10 m and mass 9 kg is attached to a wall with a hinge that exerts on the bar a horizontal force Hx and a vertical force Hy. The bar is held by a cord that makes a 90 degree angle with respect to bar and angle 50 degree with respect to wall. The acceleration of gravity is 9:8 m/s^2. What is the magnitude of the horizontal force Hx on the pivot? Answer in units of N.

2007-05-02 10:40:40 · 2 answers · asked by p.b 1

A. radiant energy
B. mechanical energy
C. chemical energy
D. nuclear energy
E. thermal energy

2007-05-02 10:39:52 · 7 answers · asked by Anonymous

A student sits on a rotating stool holding two 2 kg objects. When his arms are extended horizontally, the objects are 0.8 m from the axis of rotation, and he rotates with angular speed of 0.72 rad/sec. The moment of inertia of the student plus the stool is 2 kgm^2 and is assumed to be constant. The student
then pulls the objects horizontally to a radius 0.38 m from the rotation axis.

** Calculate the finnal angular speed of the student. Answer in units of rad/s.

** Calculate the change in kinetic energy of the system. Answer in units of J.

2007-05-02 10:36:20 · 2 answers · asked by p.b 1

When a parent radioactive nucleus splits by ejecting an alpha particle, the remaining nucleus has _the original nucleus.
A. 2 protons less and 2 neutrons more than
B. 2 protons and 2 neutrons less than
C. 2 protons and two neutrons more than
D. the same number of protons and nuetrons as
E. 2 protons more and 2 neutrons less than

2007-05-02 10:36:01 · 2 answers · asked by Anonymous

A. fusion reaction
B. disaster
C. nuclear reactor
D. meltdown
E. chain reaction

2007-05-02 10:26:41 · 2 answers · asked by kia_1718 2

A. lead
B. concrete
C. water
D. a and b
E. a.b, and c

2007-05-02 10:17:45 · 7 answers · asked by kia_1718 2

According to m-theory the creation of universes is possible to do in a lab. I am only a highschool sophomore so I don't know any of the physics teachers to ask them about it. Is it possible that in those experiments where they shoot particles at each other at high speeds to see glimpses of the early universe that they are actually creating universes?

2007-05-02 10:12:21 · 6 answers · asked by Brad 3

What happens to us?

2007-05-02 10:12:16 · 4 answers · asked by Anonymous

The process which describes the splitting of a large unstable atom into two intermediate size atoms and extra neutrons is called_______
A. nuclear fusion
B. chain reaction
C. hydrogen bomb explosion
D. nuclear fission
E. reactor

2007-05-02 10:08:52 · 4 answers · asked by kia_1718 2

The uranium decay chain ends when the final disintegration product is the stable element______
A. lead
B.thorium
C.radium
D.uranium
E.radon

2007-05-02 10:00:07 · 4 answers · asked by kia_1718 2

Hi, I'll be taking physics final tomorrow and I'm just so confused on the circuit problems.

Could you tell me the convention of the relatioships among the V, I, and R?

I mean like..
1. the voltage drop across each resistor wheather it is in series or parallel are all same as the V of battery?

2. to find current in EACH resistor(parallel), I don't have to look for Req to calculate but to just use each resistance?

3. the sum of V drop across the series part of circuit and across the parallel part of circuit is same as total V?

4. How would you find the V drop across each resistor that are in series-parallel complex?

5. I just don't get when to find Req to calculate what
and when to separate series and parallel part of R to calculate what..

correct me if i'm getting all those wrong and please explain me some general conventions to follow in each possible case.
Thank you so much..I really want to do well on this test..:)

2007-05-02 09:57:02 · 1 answers · asked by Anonymous

People living at Earth's equator are traveling at a speed of about 1670km/h as Earth spins on its axis. Are these people being accelerated?

2007-05-02 09:56:48 · 2 answers · asked by Claire P 1

A man jumps off a 20 m high bridge using an elastic bungee cord of unstretched length 10 m. The jump is so designed that the man at the lowest point would just touch the water, and be yanked back up. Find the period, in seconds, of simple harmonic motion that would result.

Find the length in meters of a simple pendulum with the same period.

2007-05-02 09:46:04 · 2 answers · asked by Tyler D 1

a 2000 kg car whose brakes have failed coasts at 30 mph toward a 1000 kg car whose brakes are locked in "park" mode. If the coefficient of sliding friction between the 1000 kg car and the road is 0.7, determine how long after the first collision the second collision occurs.

Then find the distance between collisions.

Will there be a third collsion? proove or disprove.

2007-05-02 09:43:07 · 2 answers · asked by Tyler D 1

I am assuming that sunlight is white light anyway...
I'd like to measure the wavelengths of different coloured light in a lamp that emits light similar to that of 'natural sunlight' using Youngs Double Slit Exp

To get monochromatic light, that is of the ROYGBIV colours, would I just place a coloured filter in front of the white light source? [and proceed to carry on with the exp as its usually done...]

Also, is there a formula or relationship between the intensity of the light and wavelength?

And lastly (sorry for the longness), can anyone see how it is possible to incorporate a LDR with the experiment?

Thank you sooooo much!!

2007-05-02 09:34:36 · 4 answers · asked by 0425x 2

If he dropped a 2-lb. bag made of cloth and a 2-lb. rock, What would he have seen and why?

2007-05-02 09:34:21 · 3 answers · asked by krysdizzle_2006 1

Let's face it - despite their meaningless mathematics and self-defensive blather, a slight risk of causing the end of the world is STILL A RISK! A risk not worth taking. So why is this experiment being allowed to continue?
Is it because the American government is financing it? Because the American business/politics elite - which is full of Christians - are financing it because they WANT to bring about the end of the world in order to bring us "before god" for "judgement"?
Shouldn't the rest of the world - captained by Switzerland - be going to war with America over this?!

2007-05-02 09:19:33 · 6 answers · asked by distrest 2

I heard this question on Brainiac and i want to know if it is possible

2007-05-02 08:28:13 · 18 answers · asked by Kevin T 3

the plank is 4.5 m and weights 202N resting on 2 supports with 1.1m overhang. first plank at front then 3.4 m to the 2nd. and 1.1m after the 2nd

2007-05-02 08:15:50 · 1 answers · asked by tx_guy505 1

A vacuum of space,....... where matter is non existant.

Absoloutely?,.... or...... Not possible?

2007-05-02 08:08:14 · 3 answers · asked by peanut 5

How Does Newton Third Law of Motion, relate to Gravity.
The Law States that for every force there is an opposite and equal force.

Where is the Opposite force when two bodies are attracted to one another? There is no opposite force of equal strength.

2007-05-02 07:49:43 · 4 answers · asked by robert i 1

Aether is known to fill the Universe and to serve as
light conducting medium. Aether is ideal gas of elusive
aether atoms with speed of sound 300,000,000 m/s,
predicted by Mendeleev to occupy the zeroth cell in
Periodic table. Einstein's famous cosmoligical constant
accounted for omnipresent aether, the negative density
of aether ρA compensating for average observable
density of matter in the Universe ρU = -ρA = 10^-30 g/cm³.

Estimate universal pressure of aether.

2007-05-02 07:01:32 · 6 answers · asked by Alexander 6

Mass aluminum cup = 80 grams
mass water = 375 grams
voltage= 6.0 V
current = 1.5 A
clock time= 17 min
initial water temp= 19.2 C
final water temp= 24.7 C
specific heat of water= 1.0cal/g C
specific heat aluminum= .215 cal/g C

1. what was the temp change of water (and aluminum cup)

2. how much heat did the water absorb?

3. how much heat did aluminum cub absorb?

4. how much energy was supplied to circuit?

5. based on results what value should be reported for the mechanicle equivalent of heat?

I was absent for this lesson please help!

2007-05-02 07:00:35 · 1 answers · asked by Fresca 2

A. there is no net charge on the plates
B. unequal amounts of charges accumulate on the plate
C. the potential difference between the plates equals the potential difference between the terminals of the battery
D. the charge on both plates is the same

2007-05-02 06:35:33 · 7 answers · asked by Bo-Gotti 1