The energy required to accelerate an interstellar spaceship depends on
A) its mass only
B) its final velocity only
C) the type of fuel it uses
D) its mass and final velocity
D
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Which of the following is one important reason why most large astronomical telescopes are reflecting telescopes rather than refracting telescopes?
A) Reflecting telescopes have their heaviest component (the mirror) at the bottom rather than the top of the telescope's tube. B) Reflecting telescopes take up less space than refracting telescopes. C) Reflecting telescopes are taller than refracting telescopes. D) For a mirror and lens of the same diameter, a mirror will collect more light.
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
In a reflecting telescope the objective is a ____
a. prism b. mirror c. lens d. diffraction grating e. photographic plate
In a large tank of liquid, the hydrostatic pressure at a given depth is a function of
a. depth. b. surface area. c. liquid density. d. Choices a and c are both valid.