Which one of the following processes of heat transfer requires the presence of a fluid?
a. conduction
b. radiation
c. convection
d. none of the above choices are valid
c
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A series circuit consists of a 100-V DC power source, a 100-? resistor, and a variable resistor of resistance R, which varies from 0 to 100 ?. The current in the circuit is
?
?
a.
directly proportional to R.
b.
inversely proportional to R.
c.
directly proportional to (100 ? + R).
d.
inversely proportional to (100 ? + R).
e.
neither directly nor inversely proportional to R or to (100 ? + R).
The peak of a body's blackbody radiation curve shifts upward as the temperature of the body increases
Indicate whether the statement is true or false
Which of the following formed elements has a nucleus?
a) Platelet b) Red blood cell c) White blood cell d) A and B e) All of the above
A copper sphere, 10 cm in diameter, is subjected to a pressure of 1.0 × 106 N/m2. What is the change in the diameter of the sphere? The bulk modulus for copper is 1.4 × 1010 N/m2
A) 2.2 × 10-6 m B) 2.2 × 10-7 m C) 7.1 × 10-6 m D) 7.1 × 10-7 m E) 7.1 × 10-8 m