The resistance of an object is defined as
A) (length)/(resistivity)(cross-sectional area).
B) (current)/(voltage).
C) (voltage)/(current).
D) (length)(resistivity)(cross-sectional area).
E) (voltage)(current).
C
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If the temperature of the sun is 5800 K, then what is wavelength where the blackbody radiation is a maximum?
A. 402.0 nm B. 465.0 nm C. 500.0 nm D. 575.0 nm E. 625.0 nm
A monster turnip (assumed spherical) weighing in at 0.45 kg is dropped into a cauldron of water boiling at atmospheric pressure. If the initial temperature of the turnip is 17°C, how long does it take to reach 92°C at the center? Assume that
GIVEN
FIND
Time needed to reach 92°C at the center
ASSUMPTIONS
SKETCH
An ancient rock is found to contain 40Ar gas, indicating that 77% of the 40K in the rock has decayed since the rock solidified. Any argon would have boiled out of liquid rock. The half-life of 40K is 1.25 billion years
How long ago did the rock solidify? A) 2.6 billion years B) 0.50 billion years C) 1.8 billion years D) 0.30 billion years
__________is one of the Jovian planets
A) Saturn B) Mars C) Pluto D) Mercury