Physics - March 2007

Not homework, just for me. Thanks.

2007-03-27 12:01:52 · 2 answers · asked by Dovey 7

1. all movement is compared with a frame of reference

2. The most commonly used frame of reference is the earth

3. a change in position relative to a frame of reference is motion.

4.The rate at which an object changes position is called speed

5.Velocity is speed and motion

6.if a motorboat trtavels 25 km/hr down a river that has a velocity of 4 km/hr, what is the boat's actual velocity?- 6.2 km/hr

7.The rate of change of velocity is called acceleration.

8.A distance time-graph is a straight line for constant speed.

9.An object traveling in circular motion is constantly changing distance.

10. Momentum is mass times velocity.

2007-03-27 11:59:44 · 2 answers · asked by !¿question!? 2

from one side to the other, exactly through the center. Now, If I dropped a bowling ball into said hole, would it come out the other side? If not, what would happen to it?

2007-03-27 11:37:12 · 4 answers · asked by krodgibami 5

Not homework. Just me.

2007-03-27 11:26:45 · 6 answers · asked by Dovey 7

How long after the switch is closed does the voltage across the resistor drop to Vf = 6.7 v? Answer in units of s. Given: EMF = 13 V, resistance R = 102 ohms, and capacitor C = 1.4 microF. All in series.

After solving a similar problem, the formula i = Io*e^(-t/RC). Io could be found using the formula Io = E/R. And i could be found by the formula i = V/R, using the potential drop given in the question as V. The only thing left to solve for is t, the answer, but thats where I'm having trouble. The variable 'e' is whats causing me some confusion. Any help would be appreciated.

2007-03-27 11:15:50 · 2 answers · asked by mmrage318 1

2007-03-27 11:15:33 · 3 answers · asked by armani 1

Can someone help me with the following questions on plane mirrors? Thanks.

1) Why is it impossible to form real images with a plane mirror?

2) To take a clear picture of an image in a plane mirror, should the camera be focuses on the image or on the surface of the mirror?

Thanks again!

2007-03-27 11:08:35 · 1 answers · asked by Anonymous

2007-03-27 11:07:37 · 4 answers · asked by Anonymous

A metal sphere has a charge of +6.0 µC. What is the net charge after 6.00 1013 electrons have been placed on it?

2007-03-27 11:00:05 · 1 answers · asked by Alan l 1

(a) Find the acceleration due to gravity at the surface of a neutron star of mass 1.5 solar masses and having a radius of 11.0 km.
____m/s2
(b) Find the weight of a 0.121 kg baseball on this star.
____N
(c) Assume the equation PE = mgh applies, and calculate the energy that a 70.0 kg person would expend climbing a 1.00 cm tall mountain on the neutron star.
____J

Thank you to everyone that attempts this problem! You are a genius. Everyone in my physics group (including me) does not understand this one. Thanks again!

2007-03-27 10:51:20 · 2 answers · asked by Anonymous

2007-03-27 10:33:32 · 6 answers · asked by ara2680 2

If I were to travel forward in time, trillions upon trillions of years, through big crunches and big bangs, through trillions of big crunches and big bangs, through enough time to allow for every possible variation of each incarnation of the Universe with each minute detailed differences, to a near "infinite" amount of time, could I end up at a place that is exactly the same, with all the same variables, including my departure?

Basically, could I travel far enough forward, that I would end up back to where I started?



And yes this is theoretical speculation, so I don't need jackassy answers. I know I can't do it, I'm just wondering if it's conceivable.

2007-03-27 10:32:22 · 5 answers · asked by Luis 6

I want to know, if the spinning of earth stops what can be the major after effect especially effects on gravitational pulls or gravity?

2007-03-27 10:30:36 · 11 answers · asked by Ali 2

A jet traveling at a speed of 2.30 *10^2 m/s executes a vertical loop with a radius of 7.00 *10^2 m. Find the magnitude of the force of the seat on a 70.0 kg pilot at the following positions.
(a) the top of the loop
____ N

(b) the bottom of the loop
____ N

Thank you so much in advance! For some reason I cannot figure out this problem and I really need to know how to do it because I have to do other problems just like it. Thanks again!

2007-03-27 10:27:00 · 1 answers · asked by Anonymous

Can you pull the hydrogen and oxygen out of water with a electrolyzer and then burn hydrogen and oxygen in a generator to make electric that would then run the electrolyzer? In doing this could you generate more electric than you need to run the electrolyzer? Making power from water alone. Please before you say that you can't make more energy than you put in. Please think about what you are doing. The energy you are putting in is only to brake the hydrogen and oxygen out of the water. If hydrogen can be ran in a generator that would use propane and run at the same cu ft/hr as propane you can generate more power than it takes to run the electrolyzer. The oxygen is not even being used at this point and if you could use a generator that could use both the hydrogen and oxygen you could make even more power.

2007-03-27 10:14:55 · 8 answers · asked by Craig E 1

At a certain depth the water molecules can't freeze because of the pressure of the colum of water above it becomes too great for them to expand so consequently they can't freeze and thus becomes "Super cooled water", but at what depth does this occur? And does temp have any effect ?

2007-03-27 10:13:48 · 1 answers · asked by atreyu5797 1

A car starting from rest accelerates up to 50km/sec in 6 seconds. If the car’s wheels have a diameter of 0.8 meters, what are the wheels’ average angular acceleration (rads/sec/sec)?

2007-03-27 10:07:25 · 1 answers · asked by GSU 1

If a Ferris wheel starts from rest and accelerates up to an angular velocity of 1 revolution every 10 seconds, what is the average angular acceleration if this acceleration takes 1 minute? How many revolutions does the Ferris wheel undergo in this time?

2007-03-27 10:06:17 · 2 answers · asked by GSU 1

If a bicycle with 700mm diameter wheels is ridden 10km in 15 minutes, what is the average angular velocity (rad/sec) of the bike’s wheels during this trip?

2007-03-27 10:05:23 · 2 answers · asked by GSU 1

2007-03-27 09:52:35 · 10 answers · asked by john m 1

A current U.S. 12 oz soft drink can measures about 6.6 cm(2.6 inches) in diameter and 12.1 cm (4.75 inches) tall. The area of a cylinder of these dimensions is about 316 square cm (49 square inches), including the ends. The force of one atmosphere of pressure on that area is about 3200 newtons (720 lbs). Nevertheless, such cans can be made of very thin aluminum because the same force acts outward from the inside of the can.



If a few cubic centimeters of water is poured into such a can (just enough to cover the bottom) and the can is held above a laboratory burner for about 30 seconds, the water can be brought to the boiling point where its vapor pressure is equal to atmospheric pressure. The vapor will then push most of the air out of the can. If the can is quickly inverted into a beaker of water, sealing off the opening, the sudden drop in vapor pressure will result in enough net inward pressure to quickly crush the can.

2007-03-27 09:43:00 · 1 answers · asked by fun fun fun .... you know the rest 5

schrodinger came up with the psi, Ψ , state function.
can you explain what exactly is Ψ and also what the equation Ψ*Ψ = |Ψ|^2 means?

2007-03-27 09:40:57 · 1 answers · asked by sh 1

2007-03-27 09:29:27 · 10 answers · asked by modah 1

This used to happen to me alot when I was a child......falling asleep in the back of the car whilst your parents are driving. You doze off, being lulled by the drone of the car engine and then suddenly the engine noise stops for a split second....and then continues again. WHY does this happen? Is it anything to do with quantum physics? Are there any other examples of this kind of thing happening?

2007-03-27 09:25:11 · 5 answers · asked by lbw1969 1

2007-03-27 09:19:22 · 4 answers · asked by breezy 3

If gravity is a spacetime curvature(the Einstein theory which I barely understand), does all the matter in the universe itself create a large spacetime curvature that creates gravity?

If the universe IS matter, does that matter curve spacetime and create gravity?

That is, in theory, outside the Universe, if there was something else out there, would it get pulled in by gravity?

2007-03-27 09:12:56 · 6 answers · asked by Luis 6

2007-03-27 08:56:19 · 8 answers · asked by Narissa J 2

2007-03-27 08:52:46 · 2 answers · asked by Narissa J 2

Like if you stired water real fast would it create friction on the sides of the container it was being stired in and heat up.

2007-03-27 08:47:17 · 4 answers · asked by Anonymous

do you know any physical significanse of these physical determinants like angular momentum and moment of inertia?please share your views.

2007-03-27 08:46:52 · 5 answers · asked by Anonymous