A reflecting telescope differs from a refracting telescope by using:
a. a concave mirror.
b. a convex mirror.
c. a system of five converging lenses.
d. two converging lenses.
e. a single converging lens.
a
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Which of the following is true of wavelengths of signals sent into space?
A) Wavelengths longer than 100 cm are absorbed in Earth's atmosphere. B) The interval between the 21-cm spectral line of neutral hydrogen and the 18-cm line of OH has very high background interference. C) Wavelengths longer than 100 cm get lost in the background noise of the Milky Way Galaxy. D) The interval between the 21-cm spectral line of neutral hydrogen and the 18-cm line of OH is narrow and can be monitored easily.
Shear Modulus: Opposing shearing forces of 3000 N are applied to the 4.00-cm × 5.00-cm faces of a metal block measuring 3.00 cm × 4.00 cm × 5.00 cm. By what amount does the block become slanted? The shear modulus for this metal is 8.10 × 1010 N/m2.
A. 1.54 × 10-6 m B. 5.56 × 10-7 m C. 9.88 × 10-7 m D. 3.08 × 10-6 m E. 6.98 × 10-6 m
Saturn's moon named ______________ is the second largest moon in the solar system
a. Titan b. Europa c. Ganymede d. Phobos e. Diamos
In an AC series circuit the inductive reactance is 150 W and the frequency is 100 Hz. What is the inductance in the circuit?
a. 740 mH c. 500 mH b. 80 mH d. 240 mH