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.
C
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Once a terrestrial planet had formed from a large number of planetesimals, heat could have melted it and allowed it to differentiate into metallic core of ____density and a rocky mantle or crust of ______ density
a. higher; lower b. lower; higher c. Wrong! The interior stays solid d. Wrong! There is no separation according to density.
In ultrasound the __________ of the sound is much greater than in normal sound
Fill in the blank(s) with correct word
You are traveling in a space ship at half the speed of light (0.5c) directly toward an oncoming photon traveling at the speed of light (c). At what speed would you see the photon coming toward you?
A) c B) 0.25c C) 1.5c D) 0.5c
Velma passes Mort at a high speed. Each holds a meter stick, oriented perpendicular to the direction of relative motion. Mort observes that
A) his meter stick is 1 m long, and Velma's meter stick is longer than 1 m. B) his meter stick and Velma's meter stick are both shorter than 1 m. C) his meter stick and Velma's meter stick are both 1 m long. D) his meter stick is longer than 1 m, and Velma's meter stick is 1 m long. E) his meter stick is 1 m long, and Velma's meter stick is less than 1 m long.