The quark structure of the proton is uud
a. True
b. False
Indicate whether the statement is true or false
True
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The tidal streams mapped in the Halo are similar to ________ in our solar system
A) the asteroid belt between Mars and Jupiter B) the moons orbiting planets C) meteor swarms in old comet orbits D) the solar wind E) the rings around the jovians
An elevator is being lifted upward at a constant speed by a steel cable. All frictional forces are neglected. In this situation, forces on the elevator are such that
A. the upward force by the cable is equal to the downward force of gravity. B. the upward force by the cable is smaller than the downward force of gravity. C. the upward force by the cable is greater than the downward force of gravity. D. None of these choices are correct (the elevator goes up because the cable is being shortened, not because an upward force is exerted on the elevator by the cable)
What do we mean by the interstellar medium?
A) the gas and dust that lies in between the stars in the Milky Way galaxy B) the dust that fills the halo of the Milky Way galaxy C) the middle section of the Milky Way galaxy D) the name of an oracle who can channel messages from beings that live near the star called Vega
According to Copernicus, the retrograde motion for Mars must occur
A) at inferior conjunction, when Mars laps the Earth and passes between us and the Sun. B) at superior conjunction, when Mars lies on the far side of the Sun. C) at quadrature, when Mars lies exactly 90 degrees east or west of the Sun. D) at greatest elongation, when Mars can get up to 47 degrees from the Sun. E) at opposition, when the Earth overtakes Mars and passes between Mars and the Sun.