Which of the following statements pertaining to a vacuum flask (thermos) is NOT correct?
A. Silvering reduces radiation loss
B. Vacuum reduces conduction loss
C. Vacuum reduces convection loss
D. Vacuum reduces radiation loss
E. Glass walls reduce conduction loss
Answer: D. Vacuum reduces radiation loss
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The semi-major axis of an ellipse is:
A) the ratio of the distance between the two foci to the half of the length of the longest diameter of the ellipse. B) half the length of the shortest diameter of the ellipse. C) half the length of the longest diameter of the ellipse. D) the ratio of the longest diameter of the ellipse to the shortest diameter of the ellipse.
You throw a ball straight up, it peaks out and then comes back down to you. During this motion, the velocity and acceleration always point in the same direction
a. True b. False Indicate whether the statement is true or false
What element dominates the ice on the surface of Pluto?
a. methane b. nitrogen c. hydrogen d. carbon monoxide e. carbon dioxide
If Hubble's constant is actually half the value we believe it to be (70 km/(s/Mpc)), the Universe would be
A. four times as old as we think it is. B. half as old as we think it is. C. the same age. D. twice as old as we think it is.