What is the celestial sphere?
A) The celestial sphere is a representation of how the entire sky looks as seen from Earth.
B) The celestial sphere is a model that shows the true locations in space of the Sun and a few thousand of the nearest stars.
C) The celestial sphere is a model of how the stars are arranged in the sky relative to our Sun, which is in the middle of the sphere.
D) It represents a belief in an Earth-centered universe, and hence is no longer considered to have any use.
A
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Moving electric charges are surrounded by
A. electric fields B. magnetic fields C. both of these answers D. neither of these answers
What is the product of 11.24 and 1.95 written with the correct number of significant figures?
A) 22 B) 21.9 C) 21.92 D) 21.918 E) 21.9180
Spherical particles of density 3.0 g/cm3 are shaken in a container of water (viscosity = 1.0 × 10^-3 N•s/m3). The water is 8.0 cm deep and is allowed to stand for 30 minutes. What is the radius of the largest particles still in suspension at that time?
a. 4.5 × 10^-6 m c. 2.6 × 10^-6 m b. 9.0 × 10^-6 m d. 5.6 × 10^-6 m
Gravity causes the pressure in the ocean to vary with depth
Indicate whether the statement is true or false