A blacksmith is flattening a steel plate that measures 10 cm × 15 cm × 1 mm. He has heated the plate to 900 K. If the emissivity of the plate is 0.75,
what is the total rate at which it radiates energy? The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 • K4. Ignore any heat it receives from the surroundings.
A) 360 W
B) 760 W
C) 790 W
D) 850 W
E) 880 W
D
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In planetology, the heat of formation is:
A) the energy released by infalling matter. B) the heat released because of differentiation. C) the energy released from basin formation. D) the heat released from condensation.
It's 6 A.M. and the Moon is at its highest point in your sky (crossing the meridian). What is the Moon's phase?
A) new B) first quarter C) full D) third quarter
Ice melts if enough pressure is applied to it
Indicate whether the statement is true or false
With no air resistance a projectile fired horizontally maintains its horizontal component of velocity because
A) no forces act on it. B) no horizontal forces act on it. C) of no initial vertical component of velocity. D) all of the above E) none of the above