Discuss the extinction of the dinosaurs, relating it to an astronomical event
What will be an ideal response?
About 65 million years ago, a 20 km-wide asteroid hit near the northern end of the Yucatan peninsula, leaving a huge (now filled in) crater and devastating the entire Earth; many other species of life also became extinct as well.
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Which of the following statements is a true statement?
A) A vector can have positive or negative magnitudes. B) A vector's magnitude cannot be more than the magnitude of one of its components. C) A vector's magnitude cannot be less than the sum of the magnitude of its components. D) If the x-component of a vector is smaller than its y-component then that vector is in the opposite direction to its y-component. E) The magnitude of a vector cannot be zero unless all of its components are zero.
An object is being acted upon by three forces and moves with a constant velocity. One force is 60 N along the x-axis, the second is 75 N along the y-axis. What is the direction of the third force, measured counterclockwise from the x-axis?
A) 128° B) 182° C) 213° D) 225° E) 231°
A barometer that does not use mercury is a(n) ______________ barometer
Fill in the blank(s) with correct word
Why do elliptical galaxies appear yellow or red?
A) They contain no hot, young blue stars B) They contain only massive-stars that have progressed to the red-giant stage C) They have very little dust or cool gas, and thus have little ongoing star formation D) A and B E) A and C