physics

i was just doing our project in physics tht was needed to pass this monday,so i need youre help guys hope you will response.

An Earth (mass M) satellite of mass m is in a circular orhit of radius r1. It is moved to an orbit with a larger radius r2, by way of an intermediate elliptical orbit, This is achieved by firing rockets for a short period when it is in the inner orbit and then firing the rockets again when it...

A synchronous satellite, which always remains above the same point on a planet's equator, is put in orbit around Mars so that scientists can study a surface feature. Mars rotates once every 24.6 h. Use the data of Table 13.2 to find the altitude of the satellite. Mass of Mars: 6.42e23 Mean...

I heard somewhere that einstein and all of physics has disproved the ability to tell the future, therefore all palm readers, fortune tellers, and tarot card people are lying. What principle/law in physics disproves the ability to tell the future?

A satellite orbits the earth with a constant speed at a height 1000 km (1000000 m) above the earth’s surface. Given that the radius of the earth’s surface, R = 6.38 x 106 m, the mass of the earth, M = 5.98 x 1024 kg, and the value of the gravitational constant is G = 6.67 x 10-11 N m2/kg2, the...

If... E(total) = -GMm/2R Change in E = GMm/2 x (1/Ri - 1/Rf) Can anyone explain why its 1/Ri - 1/Rf?

Satellites in orbit are accelerated toward the earth, so they must be getting closer and closer to our planet. Is this true or false and why?

...cylindrical satellite!? To get a flat, uniform cylindrical satellite spinning at the correct rate, engineers fire four tangetnial rockets as shown below: http://img8.imageshack.us/content.php?page=done&l=img8/4492/83717.jpg&via=mupload If the satellite has a mass of 3340 kg, a radius of...

I have a few problems that I don't quite understand and weren't explained well. So could I get some aid with these problems? --> The gravitational force between two electrons 0.90 m apart is 6.69 multiplied by 10-71 N. Find the mass of an electron. (Use G = 6.67 multiplied by 10-11 N·m2/kg2.)...

This would be for the extended essay, IB diploma, for those of you that have heard of it. As this would need to be a 4000 word essay, it would need to be more than just changing the weight to see how speed is affected etc. Does anyone have any ideas or thoughts on what I could investigate in a...

I am having some issues understanding how to use the formula(s) to solve this. Our professor is Eastern European and difficult to understand at times. Could someone please help me understand how to do this in some detail please. (I understand the free body diagram, how the forces are...

A satellite orbits a planet at a distance of 6.30x10^8 m. Assume that this distance is between the centers of the planet and the satellite and that the mass of the planet is 7.40x10^24 kg. Find the period for the moon's motion around the earth. Express the answers in earth days

ona test track, a sport utility vehicle (SUV) of mass 2000 kg, traveling at 12 m/s, hits a stationary car of mass 1000 kg. The car crumples and stays in contact with the SUV; they move together as a unit. Which vehicle, if either, undergoes a greater change in velocity during the collision...

A satellite is in a sationary orbit above Earth. Given that Earth's mass is 6 x 10^24, what is the radius of orbit (km) of this satllite? a) 2.9 x 10^3 km b) 4.2 x 10^4 km c) 8.7 x 10^6 km d) 7.5 x 10^13 km Please help? thank you!

An earth satellite moves in a circular orbit with an orbital speed of 6100 m/s . What is the time of one revolution of the satellite? what is the radial acceleration of the satellite in its orbit? i need help with this. thanks

SUVs are supposed to be unsafe because of inferior handling... the main issue is center of gravity, but do the wheels have anything to do with it as well? Do their wheels make it harder or easier to brake and turn? Equations VERY appreciated!!!

...provide 120 volts of AC electricity.? physics help a stereo needs 200 watts of power, and you know your house provide 120 volts of AC electricity. how much current does the stereo draw? explain well and i will choose your answer as best. do you use this formula P= I * V? i put 200=120I? and...

A boat has a mass of 6800 kg. Its engines generate a drive force of 4250 N, due west, while the wind exerts a force of 770 N, due east, and the water exerts a resistive force of 1200 N due east. What is the magnitude and direction of the boat's acceleration?

In High school physics, we have a project where in groups of 6 people, we build a boat using whatever we want. We have a month to build a boat that can carry two people and can race against other boats from a different school. Is it better to build a cardboat boat or a plywood boat? Where should...

a. why do the record deck, tuner, cd, and cassette deck all feed into the amplifier? c. conecting cd to amplifier input or out put socket? why? for part c. the why bit means why out put of cd in to the input and not the other way round?