physics chapter 10 test – Flashcards

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question
according to keplers laws,the paths of planets about the sun are?
answer
ellipses
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a rock is thrown upward @ 50 degrees with respect to the horizontal.as it rises,neglecting air drag,it's vertical component of velocity?
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decreases
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a rock is thrown upward at 50 degrees with respect to the horizontal.as it rises,neglecting air drag,it's horizontal component of velocity?
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remains unchanged
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a bullet fired horizontally from a rifle begins to fall?
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as soon as it leaves the barrel
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an earth satellite is simply a projectile?
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freely falling around the earth
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earth satellites are typically more than 100 km high so as to be above earths?
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atmosphere
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a projectile is launched at ground level an angle of 15 degrees above the horizontal and lands down range.what other projection angle for the same speed would produce the same down range distance?
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75 degrees
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two projectiles are fired from ground level at equal speeds but different angles.one fired at an angle of 30 degrees and the other at 60 degrees.the projectile to hit the ground first will be the one fired at (neglect air resistance)
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30 degrees
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without air resistance,a projectile fired horizontally at 8 km/s from atop a mountain would?
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all of these
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planets would crash into the sun if it weren't for there?
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tangential velocities
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The circular path of a satellite orbiting the earth is characterized by a constant?
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all of these
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an Earth satellite is in an elliptical orbit. The satellite travels fastest when it is?
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nearest the earth
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The speeds of the planets about the sun depend on?
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there distances from the sun
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A vertically oriented rocket that is somehow able to maintain a continuous upward velocity of 8 km/s will?
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escape from the earth
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satellite in an elliptical orbit travel at constant?
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none of these
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The period of a satellite, the time it takes for a complete revolution, depends on the satellites?
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Radial distance
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compared to the period of satellites in orbit close to the earth, the period of satellites in orbit far from the earth is?
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longer
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acceleration is greater for a satellite when it is at the?
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perigee
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The tangential velocity of an Earth satellite and it's velocity?
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are parallel to the surface of the earth
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what prevents satellite such as the space shuttle from falling?
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nothing they are continually falling as the orbit the earth
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The fastest moving planet in the solar system is?
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The planet nearest the sun
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it takes Pluto a longer time to orbit the sun than the earth does because Pluto?
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goes much slower, has much farther to go, choices A&B are both correct
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A "weightless" astronaut and orbiting shuttle is?
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like the shuttle, pulled by earths gravitational
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considering mood not Orbitz one of our most distant planets in an elliptical path. The distance that the moon covers each day is?
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greatest when the moon is closest to the planet
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A lunar month is about 28 days if the moon were farther from the earth that it is now, the lunar month would be?
answer
more than 28 days
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