When a material is found to have no definite volume and no definite shape, what is the phase of the material?
a. Gas
b. Liquid
c. Plasma
d. Solid
a
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Suppose that the light from the sun suddenly shut off all over the sun, precisely at noon, as measured by clocks placed near the sun. Viewed from Earth, how would this appear? (HINT: It is about 8 light-minutes to the sun.)
A) Nothing unusual would happen, as viewed from Earth. B) At noon, all sunlight would suddenly cease. C) At about 8 minutes past noon, all sunlight would suddenly cease. D) After about 8 minutes, the sun would turn into Daffy Duck. E) At about 8 minutes past noon a small black spot would appear in the center of the sun, and this black spot would rapidly spread out over the entire sun.
A tractor T is pulling a trailer M with a constant velocity. If the velocity is 20 m/s and M = 200 kg and T = 500 kg, then the force on the trailer due to the tractor is
A. 600 N forward.
B. 450 N backward.
C. 200 N backward.
D. 35 N forward.
E. 0.
Lucite has an index of refraction of 1.50. What is its critical angle of incidence?
A) 1.16° B) 15° C) 41.8° D) 65.2° E) 87.4°
The international standard time is called ______________
Fill in the blank(s) with correct word