Physics - November 2007

A satellite orbits a planet of unknown mass in a circle of radius 2.0 x 10^7 meters. The magnitude of the gravitational force on the satellite from this planet is F=80N.

A) What is the kinetic energy of the satellite in this orbit?
B) What would F be if the orbit radius were increased to 3.0 x 10^7 meters?

2007-11-19 10:09:19 · 1 answers · asked by info2know 3

With all sorts of troublesome problems with fossil fuels (i.e. cost and polution), how much effort are we putting in to achieving a stable form of renewable energy?

2007-11-19 10:07:42 · 6 answers · asked by Ben H 2

2007-11-19 10:03:01 · 10 answers · asked by Pulom 3

Where time changes with respect to another variable? Are there applications for this (say, time dilation)? Are there instances where t (time) used as a function of another variable?

2007-11-19 09:52:45 · 3 answers · asked by Mitchell 5

Two cars A and B, are travelling with the same speed of 40.0m/s, each having started from rest. Car A has a mass of 1.20x10^3kg and car B has a mass of 2.0x10^3 kg . compared to the work required to bring car A up to speed, how much aditional work is required to bring car B upto speed?

2007-11-19 09:42:31 · 1 answers · asked by dilo247 1

The coeeficent of kinetic friction (uk)= 0.2.

A. Draw a feed body diagram of all forces acting on the box.
B. Find the force of kinetic friction.
C. Find the accleration of the box.

The answer for B is fk= 53.75 N
The answer for C is a= 1 m/s squared upwards

I know the answers for the B and C, but I need their work and the answer to A as well

Click link to see a diagram

http://img.photobucket.com/albums/v63/xmattbrettlockx/Physics1.jpg

2007-11-19 09:40:17 · 1 answers · asked by joe s 1

What stops matter going faster then 185 999mps?

2007-11-19 09:38:55 · 12 answers · asked by futuretopgun101 5

Actually i am building a robot car therefore i am looking for the main circuit diagram on web site.so plz if u knows about any usefull web site where i can find robot car circuit diagram,then plz let me know

2007-11-19 09:38:39 · 1 answers · asked by ozi 1

We're learning about the different phases of matter and my science teacher was telling us that Plasma was the most rare phase on earth but the most common in the universe. I was just wondering if it could actually be made here on earth and how. Well, im not actually wondering...it's a question i have to answer for homework

2007-11-19 09:35:34 · 8 answers · asked by Scented Marker 2

2007-11-19 09:12:00 · 2 answers · asked by Anonymous

I really suck at physics, can someone help me?

You ski down a frictionless icy hill that has a slope of 30 degrees above horizontal. What is the magnitude of your acccceleration down hill?

Can someone please explain?

2007-11-19 09:00:08 · 1 answers · asked by The Problem Solver 3

I think I have an idea about a way to produce electricity based on physics, which is 100% renewable, reliable and eco-friendly. Does anyone know where I can get my idea heard? Or where I can ask a question on a more specialised website to see if it is realistic?

2007-11-19 08:56:19 · 5 answers · asked by BoB C 1

i mean u put water on paper nd it goes soggy put it on wood it just goes away but it on metal nuffin!.
same wiv fire. paper burns but thjeres sum stuff that dont!! explain plz

2007-11-19 08:48:37 · 4 answers · asked by Mr_Anomynous 2

2007-11-19 08:46:29 · 2 answers · asked by Anonymous

A gymnast is performing a floor routine. In a tumbling run she spins through the air, increasing her angular velocity from 3.00 to 4.15 rev/s while rotating through one-third of a revolution. How much time does this maneuver take?

2007-11-19 08:46:10 · 1 answers · asked by jdcowboy2500 1

A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.20 and the push imparts an initial speed of 3.8 m/s?
_____m

2007-11-19 08:28:19 · 1 answers · asked by roofchelsea 1

If the coefficient of kinetic friction between a 32 kg crate and the floor is 0.35, what horizontal force is required to move the crate at a steady speed across the floor?
____N
What horizontal force is required if µk is zero?
____N

2007-11-19 08:27:13 · 1 answers · asked by roofchelsea 1

2007-11-19 08:26:27 · 7 answers · asked by danielle_shye 1

Hi, hope someone can help with this basic physics question. I realise that the pressure of a liquid or gas is proportionate to changes in its volume and temperature. But does the actual volume of a gas or liquid ever change due to changes in its temperature or temperature,

2007-11-19 08:13:44 · 2 answers · asked by jimspike200 1

What happens at that voltage?

2007-11-19 08:10:17 · 1 answers · asked by Anonymous

the dimensions are
max. 3in width
min 13 in length
max 5 in height

we get 20' of balsa wood and as much glue as we want but our score goes by the mass it holds divided by the bridge's weight

2007-11-19 07:52:49 · 2 answers · asked by peace166 1

In the Bohr model of the hydrogen atom, an electron (m=9.1*10^-31kg orbits a proton at a distance of 5.3*10^-11m. The proton pulls on the electron with an electric force of 8.2*10^-8N.

2007-11-19 07:32:11 · 3 answers · asked by mnhw2 1

Three buildings collapsed. One plane each struck only two. The third was not hit by anything. If you examine the footage, you can see plainly that they were the result of a controlled demolition. The way the buildings crimp inward is the result of set charges being fired to blow the primary supports so that the building will collapse inward on top of itself. It is the same method used in every demolition of every tall building everywhere. The firefighters reported seeing pools of molten steel in the sub-basements for weeks afterward. Jet fuel does not burn hot enough to melt steel molten. It burns about 500 degrees cooler than is required to melt steel. How can this be explained? Why would President Bush want to kill innocent Americans and begin a war based on a heinous lie?

2007-11-19 07:28:16 · 15 answers · asked by ? 3

I would like to know how much I can put on the trailer. The trailer is 4'x7', and the maximum loading weight is 790lbs. Thank you to anyone who replies.

2007-11-19 07:26:55 · 1 answers · asked by Anonymous

the amount of radiant power produced by the sun is approximately 3.9 x 10^26 W. Assuming the sun to be a perfect blackbody sphere with a radius of6.69 x 10^8 m, find its surface temp in Kelvins. I think the answer is about 5800 K. But I have no idea how the answer was reached. can anyone help? thanks

2007-11-19 07:23:08 · 3 answers · asked by kwali 2

(a) from + to -
(b) from - to +

2007-11-19 07:22:15 · 7 answers · asked by Alexander 6

Thanks for your help and make sure you show your work!

A mover slides a refrigerator weighing 650N at a constant velocity across the floor at a distance of 8.1m. The force of friction between the refrigerator and the floor is 230N.
a) How much work has been performed by the mover on the refrigerator?
b)If the work was done in 55 seconds, then what is the power of the mover?

2007-11-19 07:14:28 · 2 answers · asked by j91621 2

2007-11-19 07:01:49 · 5 answers · asked by Anonymous

I have, yes Science homework, I mean to say, my science teacher TOLD us the 7 forces but we all forgot them... As quick as possible please!
Thank you xxx

2007-11-19 06:18:32 · 9 answers · asked by Sez 3

The first law of motion can be referred to as "The law of inertia" so what would you call the second?

2007-11-19 05:43:02 · 5 answers · asked by Anonymous