From what height above the surface of the earth should an object be dropped to initially experience an acceleration of 0.9200g? The radius of the earth is 6.38 × 106 m
A) 272 km
B) 260 km
C) 554 km
D) 510 km
A
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Which of the following statements about an ellipse is not true?
A) The semimajor axis of an ellipse is half the length of the longest line that you can draw across an ellipse. B) An ellipse with a large eccentricity looks much more elongated (stretched out) than an ellipse with a small eccentricity. C) A circle is considered to be a special type of ellipse. D) The focus of an ellipse is always located precisely at the center of the ellipse.
A wheel rotates about a fixed axis with an initial angular velocity of 20 rad/s. During a 5.0-s interval the angular velocity decreases to 10 rad/s. Assume that the angular acceleration is constant during the 5.0-s interval. How many radians does the wheel turn through during the 5.0-s interval?
a. 95 rad b. 85 rad c. 65 rad d. 75 rad e. 125 rad
Of the following, which of the following is the largest object?
a. the Milky Way galaxy b. the Large Magellanic Cloud c. the Local Group d. the Andromeda galaxy
The average mass of the atoms of an element in naturally occurring samples is called the ______________ mass of the element
a. atomic b. average c. relative d. molecular