Rocks solidified from molten material below ground are classified as ______________ igneous rocks
Fill in the blank(s) with correct word
intrusive
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What do most scientists believe existed before the Big Bang?
A) nothing B) the primeval fireball C) a singularity D) a black hole E) everything was inside Earth
What is the kinetic energy of a 200-kg satellite as it follows a circular orbit of radius 8.0 × 10^6 m around the Earth? (Mass of Earth = 6.0 × 10^24 kg.)
a. 5.0 × 10^9 J b. 1.0 × 10^10 J c. 1.5 × 10^10 J d. 2.0 × 10^10 J e. 2.5 × 10^9 J
Radiation: In an electric furnace used for refining steel, the temperature is monitored by measuring the radiant power emitted through a small hole in the wall of the furnace, of area 0.5 cm2. This hole acts like a perfect blackbody radiator having the same temperature as the interior of the furnace. If the temperature of the furnace (and therefore of the hole) is to be maintained at 1650°C, how much power will the hole radiate?
A. 20 W B. 30 W C. 40 W D. 50 W
The number of significant figures in 3.24 cm is
A. 2. B. 3. C. 4. D. 5.