When the measured quantity 45.67 kg is divided by the measured quantity 3.42 L, the answer should have how many significant figures?
a. Three
b. One
c. Four
d. Two
a
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Why isn't the Sun shrinking or expanding at present?
A) because the Sun has lived for billions of years B) Because the Sun is spinning so fast, the centrifugal forces keep the surface of the Sun supported against collapse. C) because gas pressure balances gravity in the Sun D) because the Sun is a solid substance
Pulsars are thought to be
A) accreting white dwarfs. B) rapidly rotating neutron stars. C) unstable high-mass stars. D) accreting black holes.
A dentist uses a concave mirror (focal length 2 cm) to examine some teeth. If the distance from the object to the mirror is 1 cm, what is the magnification of the tooth?
A. 6 B. 1 C. 4 D. 2 E. 1.5
A hot luminous solid emits a ______________ spectrum, while a hot luminous gas produces a ______ spectrum
Fill in the blank(s) with correct word