An LR circuit is prepared for an experiment, initially with its switch open. The time constant is that time after switch closure at which the current reaches what percentage of its final value
A. 100%
B. 90%
C. 37%
D. 63%
E. 50%
C. 37%
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An individual's eye pupil changes from a diameter of 3.5 mm to 1.4 mm as the illumination is increased. By what factor does the minimum angle of resolution change?
a. 0.5 b. 0.71 c. 2.2 d. 2.5 e. 4.9
The first pulsar was discovered by _________ in November of 1967
a. Jocelyn Bell b. Isaac Newton c. Albert Einstein d. Walter Baade e. Edwin Hubble
Which of the following is true of carbon atoms?
A) They are not crucial to life. B) They can form long, complex, stable chains. C) They have the ability to replicate. D) They link together to form proteins.
For all paths of Earth satellites, one focus of the path is
A) the location from which the satellite was launched. B) Earth's center. C) the Sun's center. D) need more information