One advantage of the Hubble Space Telescope over ground based ones is that
A) it can make better observations of the ozone layer.
B) it can better focus X-ray images.
C) its adaptive optics controls atmospheric blurring better.
D) in orbit, it can operate close to its diffraction limit at visible wavelengths.
E) it is larger than any Earth-based telescopes.
D
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Find the minimum diameter of a steel wire 18 m long that will stretch no more than 9 mm when a load of 380 kg is hung on the lower end. (Y steel = 2.0 × 10^11 N/m2)
The ideal shape for the primary mirror of a telescope is concave parabolic
a. True b. False Indicate whether the statement is true or false
Aristotle's "continuous" model of matter was proved wrong about 1807 by
a. Bohr. b. Thomson. c. Dalton. d. Rutherford.
A pendulum is made by letting a 2.0-kg object swing at the end of a string that has a length of 1.5 m. The maximum angle the string makes with the vertical as the pendulum swings is 30°. What is the speed of the object at the lowest point in its trajectory?
a. 2.0 m/s b. 2.2 m/s c. 2.5 m/s d. 2.7 m/s e. 3.1 m/s