What is the most accurate way to determine the distance to a nearby star?
A) Hubble's law
B) radar ranging
C) stellar parallax
D) Cepheid variables
E) main-sequence fitting
C
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A 60.0-Hz AC generator with a peak voltage of 110 V drives a series RL circuit with R = 10.0 ? and L = 10.0 mH. The impedance is
a. 3.77 ?. b. 9.26 ?. c. 10.0 ?. d. 10.7 ?. e. 13.8 ?.
During a collision, which of these is an indication that the total momentum has changed?
A. Heat is generated, deformation occurs, and sound is produced B. Deformation occurs C. Sound is produced D. Heat is generated E. None of these choices are correct
A steel plate has a hole drilled through it. The plate is put into a furnace and heated. What happens to the size of the inside diameter of a hole as its temperature increases?
a. increases b. decreases c. remains constant d. becomes elliptical
Machines produce less work than is used to run the machine
What will be an ideal response?