Physics - February 2007

2007-02-27 17:30:18 · 3 answers · asked by Jay a 2

2007-02-27 17:18:01 · 3 answers · asked by Anonymous

2007-02-27 16:44:19 · 4 answers · asked by Lady 2

at a velocity of 16 m/s. One second later a 2nd stone is thrown up w/ the same velocity. At what time are the two stones at the same height?

I tried using y(t) = Vo*t+1/2 * a * t^2

set heights equal, therefore...

Vo* t + 1/2 * a * t^2= Vo* (t+1) + 1/2 * a * (t+1)^2

but got a negative answer, if someone could explain the right way to do this .....great.

2007-02-27 16:39:33 · 4 answers · asked by Anonymous

Two people start at the same place and walk around a circular lake in opposite directions. One has an angular speed of 1.20 10-3 rad/s, while the other has an angular speed of 4.00 10-3 rad/s. How long will it be before they meet?

2007-02-27 16:29:14 · 1 answers · asked by dawgs1918 1

2007-02-27 16:27:27 · 4 answers · asked by Big Brother 3

Newton's law states, for every action there is an opposite and equal reaction. If we can confirm this then do we also expand to concede that if gravity is the force that pulls things together, there has to be a force trying to explode things apart?
Also, for one very, very tiny fraction of a second gravity blinked and this force won out, which caused the Big Bang. What do you think? The momentum of this force is seen today in our expanding universe, again what's your opinion.
(Just curious on majority opinion)

2007-02-27 16:04:08 · 5 answers · asked by Anonymous

Hello,
I have this problem that i need to solve in physics however evertyhing that I come up with doesn't add up it makes no sense for me. Here is the problem:

A placekicker must kick a football from a point 36.0m from the goal, and the ball must clear the crossbar, which is 3.05m. When kicked, the ball leaves the ground with a speed of 20m/s at an angle of 53 degrees to the horizontal. (A) By how much does the ball clear or fall short of clearing the crossbar? (B) Does the ball approach the crossbar while still rising of while falling?

So here is what I did. I asumed that the initial V was 20m/s and with it I found the time. Then i found the distance of Y using the 3.05sin53 then I found the velocity of why with the answer and with it I applied it to the equation delta y= Viyt + 1/2ayt

However since b asks if it is falling or raising I assumed it would be consiredered as a projectile. So i used a = -g. But it doesn't add up. I get -0.02m.

Was there something I did wrong?

2007-02-27 15:56:17 · 1 answers · asked by .joel 2

2007-02-27 15:45:40 · 3 answers · asked by sangeeetham260 1

2007-02-27 15:41:28 · 6 answers · asked by mydoggg09 1

I need to figure out the velocity of this electron and all i know is that it accelerated from rest through 300V. How can I do this?

2007-02-27 15:17:43 · 1 answers · asked by eve_60 2

2007-02-27 15:06:05 · 3 answers · asked by Javier B 1

Consider three identical metal spheres, A, B, and C. Sphere A carries a charge of -10q. Sphere B carries a charge of +7q. Sphere C carries no net charge. Spheres A and B are touched together and then separated. Sphere C is then touched to sphere A and separated from it. Lastly, sphere C is touched to sphere B and separated from it.




a) How much charge ends up on sphere C?

What is the total charge on the three spheres
(b) before they are allowed to touch each other and

after they have touched

2007-02-27 14:58:44 · 1 answers · asked by Javier B 1

hmmm... I know what I would do... what would you do?

2007-02-27 14:49:19 · 6 answers · asked by Dan M 1

2007-02-27 14:46:33 · 1 answers · asked by Javier B 1

My theory on time is that I believe that the forward movement of time is an illusion...sort of like trying to walk up a down esculator. We sense that we are moving forward but we are actually moving backwards. Time is like a plat form that all the events have already happened and we move from one to another. I believe this may explain why time travel, light speed travel to the stars, and contact with other life forms will never happen because according to my theory they would have already have happen. I think that the forward movement of time is a trick god plays on us to keep us from understanding the true nature of the universe.

2007-02-27 14:38:32 · 4 answers · asked by dennis o 1

You have a 240-ohm, a 670-ohm, and a 1.30-kiloOhm resistor.
I know the minimum is using 1/R1 + 1/R2 + ..., but I don't know how to find the max. Help? Thanks.

2007-02-27 14:31:42 · 2 answers · asked by abc123 1

How fast does light travel through crown glass? Take the index of refraction of crown glass to be 1.52 and the speed of light to be
3*10^8m/s.

2007-02-27 14:25:19 · 4 answers · asked by Anonymous

A 34.7 kg box is towed up a hill inclined at 15.3 degrees with respect to the horizontal. The tow rope is parallel to the incline and exerts a force of 104 N on the box. Assume that the box starts from rest at the bottom of the hill, and disregard friction.
The acceleration of gravity is 9.81 m/s^2.
How fast is the bos going after moving 45.1m up the hill? Answer in units of m/s^2.
Please explain it.
Thank you.

2007-02-27 14:24:41 · 2 answers · asked by honey 2

A block weighing 75.0 N rest on a plane inclined at 25.0 degrees to the horizontal. A force F is applied to the object at 40.0 degrees to the horizontal, pushing it upward on the plane. The coefficients of static and kinetic friction between the block and plane are repectively, 0.363 and 0.156
a) what is the min value of F that will prevent the block from slipping down the plane?
b) What is the min value of F that will start the block moving up the plane
c) What value of F will move the block up the plane with a constant velocity



Any help with this would be great. Don't have to give answer ( would be nice to see how it is worked out). Or just a helpful push in the right direction. Thanks alot

2007-02-27 14:23:48 · 2 answers · asked by Anonymous

if a skydiver's parachute fails to open, could falling on a big balloon ( hot air, weather, "Hindenburg :) ") save him or her from fatality. ( assuming that one is conveniently there)

2007-02-27 14:14:24 · 4 answers · asked by sage w 2

the story goes like these....in this two guys CHARL is the first one who courted me.so i accept his love.but one occassion i've seen him hugging other girl..so,beggining that day.i really hate and get mad at him and he xplain that he s just drunk that tym.and i dont believe on him..
But the day comes, we went to there place for disco together with my couzins..but while we are dancing there is a guy who came to me and he said''who are your companion??''so i said my cousins.but when he left,i ask my cousins''who is he''.and they said they dont know!so i keep on thinkin.and i dont have an idea so i decided to ask his friend ''who is he,why did he know me?then they said he is DEVIEJUNE.couzin of Charl.so i said.ahhhhhh!
at that time also,i've seen CHARL ALWAYS WATCHING ME but i don't care.and then that night also DEVIEJUNE courted me,we are together sitting in one chair,talking about our life's and i accept his love becoz im loveless that time.

2007-02-27 14:10:40 · 4 answers · asked by Dyanne A 1

Are energy and work the same thing? Explain.


Anwser this correctly for 10 points.

2007-02-27 13:47:33 · 5 answers · asked by emily 2

It states that a person moving fast experiences time slower taht a person not moving at all. This is called Time Dilation.


How much slower does time go for those living on the Equator than for those living in New York?

2007-02-27 13:34:06 · 5 answers · asked by man 1

velocity of the object is 10m/s, what is the final velocity?

2007-02-27 13:25:52 · 1 answers · asked by Varun S 1

the ration of the kinetic energy of Jill to the kinetic energy of John?

2007-02-27 13:23:51 · 1 answers · asked by Varun S 1

how many grams of perspiration must a 50kg woman evaporate to reduce her temperature by 1.5C?

2007-02-27 13:16:39 · 2 answers · asked by Anonymous

on a day when a man shows no visible perspiration he will still evaporate about 600g of water from his lungs.
a.) how many calories of heat are removed by this evaporation?
b.) what is the rate of heat loss in watts due to this process?

2007-02-27 13:16:03 · 1 answers · asked by Anonymous

Calculate the rate of heat conduction in watts out of an animal with 3.0cm thick fur. The surface area of the animal is 1.5m^2, its skin temperature is 35C, and the temperature of the surrounding air is 0C. Heat losses due to convection and conduction can be neglected, and the thermal conductivity of the fur can be assumed to be the same as that of air.

2007-02-27 13:09:42 · 1 answers · asked by Anonymous

a)Circle
b)Pentagon
c)Square
D)Triangles

2007-02-27 12:56:17 · 5 answers · asked by Veronica P 1