Gas, ______________, and pyroclastics are the three general products emitted during a volcanic eruption
Fill in the blank(s) with correct word
lava
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A sphere of surface area 1.25 m2 and emissivity 1.0 is at a temperature of 100°C. At what rate does it radiate heat into empty space? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 7.1 W B) 0.71 mW C) 1.4 kW D) 9.9 mW E) 3.7 W
Two infinite, uniformly charged, flat surfaces are mutually perpendicular. One of the sheets has a charge density of +60 pC/m2, and the other carries a charge density of -80 pC/m2 . What is the magnitude of the electric field at any point not on either surface?
a. 1.1 N/C b. 5.6 N/C c. 7.9 N/C d. 3.8 N/C e. 4.0 N/C
Giant stars are members of luminosity class III
Indicate whether the statement is true or false
An object is released from rest when it is a height h above the surface of a planet of mass M and radius R. What is the speed of the object just before striking the surface of the planet? Neglect any air resistance. Let h = 4.0 × 106 m, R = 5.0 × 106 m, and M = 4.0 × 1024 kg.
A. 7.8 km/s B. 3.5 km/s C. 5.4 km/s D. 6.9 km/s E. 4.8 km/s