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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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.
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