At different times of the year, the Sun appears to be in different parts of the sky among different groups of stars. This is so because
a. Earth revolves about the Sun.
b. the Sun rotates on its axis.
c. the Sun moves through space.
d. stars move.
e. Earth rotates on its axis.
a
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One of the most important physical properties of polymers is their low ______________.
Fill in the blank(s) with the appropriate word(s).
On planet X, the absolute pressure at a depth of 2.00 m below the surface of a liquid nitrogen lake is 5.00 × 105 N/m2. At a depth 5.00 m below the surface, the absolute pressure is 8.00 × 105 N/m2. The density of liquid nitrogen is 808 kg/m3
(a) What is the atmospheric pressure on planet X? (b) What is the acceleration due to gravity on planet X? What will be an ideal response?
In a Nb nucleus, the number of protons, neutrons, and electrons is
A) 41, 52, 93. B) 41, 52, 52. C) 41, 52, 41. D) 41, 52, 0. E) 52, 41, 0.
Which of the following NDI tests cannot detect an internal crack?
(a) Eddy current (b) Dye penetrant (c) X-ray (d) Ultrasonic pulse echo