Briefly explain the possible threat of near Earth objects
What will be an ideal response?
All of human civilization is spread out over Earth's surface and exposed to anything that falls out of the sky. Meteorites, asteroids, and comets bombard Earth, producing impacts that vary from dust settling on rooftops to blasts capable of destroying all life. In this case, the scientific evidence is conclusive and highly unwelcome. Statistically you are quite safe. The chance that a major impact will occur during your lifetime is so small that it is hard to estimate. But the consequences of such an impact are so severe that humanity should be preparing. One way to prepare is to find those NEOs (near Earth objects) that could hit this planet, map their orbits in detail, and identify any that are dangerous.
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Where is Jupiter's ring located?
A) above Jupiter's cloud tops and inside the orbit of its inner-most moon B) between the orbits of Io and Europa C) sharing the orbit of Amalthea D) in a thin ring at the distance of Io but inclined by an angle of about 30 degrees to Io's orbit E) between the orbit of the inner-most moon and the orbit of Io
A rock is dropped from the top of a vertical cliff and takes 3.00 s to reach the ground below the cliff. A second rock is thrown vertically from the cliff, and it takes this rock 2.00 s to reach the ground below the cliff from the time it is released. With what velocity was the second rock thrown, assuming no air resistance?
A) 4.76 m/s upward B) 5.51 m/s downward C) 12.3 m/s upward D) 4.76 m/s downward E) 12.3 m/s downward
Which of the following is not a basic or fundamental force in nature?
A. Strong nuclear force B. Electromagnetic force C. Frictional force D. Gravitational force
Suppose you view the solar system from high above Earth's North Pole. Which of the following statements about planetary orbits will be true?
A) All the planets orbit counterclockwise around the Sun. B) The inner planets orbit the Sun counterclockwise, whereas the outer planets orbit the Sun clockwise. C) All the planets except Uranus orbit the Sun counterclockwise; Uranus orbits in the opposite direction. D) The inner planets orbit the Sun clockwise, whereas the outer planets orbit the Sun counterclockwise.