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    Physics help please!?

    The tire takes about 3 seconds to roll down the inclined section of the track. The incline is at 7.5° from horizontal. The tire rolls along the flat part for about 2 seconds. 1.Estimate the kinetic energy of the tire (mass is approximately 25 lbs) when it reaches the bottom of the inclined...
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    Spaceship...physics.....?

    This is the picture. http://img196.imageshack.us/img196/3796/20701944.jpg 1.A spaceship has five thrusters, but one is broken. The thrusters are arranged as in the diagram below. The 45° indicates the angle between adjacent thrusters. You are in charge of a team at mission control whose task is...
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    physics circular motion?

    A planet orbits its star at a distance of 0.5 AU (1 AU=1.5x108 km) in a roughly circular orbit. One orbit takes the planet 100 Earth days. The planet has a mass of 2x1024 kg. a.What are the magnitude and direction of the force keeping the planet in its orbit?
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