The dissociation energy of the hydrogen molecule is approximately 5 eV. What is the temperature of a monatomic molecule whose kinetic energy is equal to 5.000 eV?
a. 28990 K
b. 57970 K
c. 38650 K
d. 23190 K
e. 12880 K
c
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A coil of 150 turns of wire is in the form of a circle, carries a current of 63 mA, and sits in the center of a dipole magnet that produces a uniform magnetic field of strength 1.5 T. The torque on the coil has a maximum value of 0.25 Nm. What is the radius of the coils?
A. 9.2 cm B. 13 cm C. 0.56 cm D. 7.5 cm
The discovery of the cosmic microwave background was important because
A) its detection was a major advance in microwave testing. B) it was experimental verification of a prediction from the Big Bang theory. C) it showed the universe must be closed, with more than the critical density here. D) it established a firm center of the universe. E) it proved that astronomy at radio wavelengths was possible.
What is the current through the 2.0-? resistor?
a.
1.0 A
b.
0.50 A
c.
1.5 A
d.
2.0 A
Specific Heat: A person running in place on an exercise machine for 10 min uses up 17 kcal (food calories). Another person exercises by repeatedly lifting two 2.5-kg weights a distance of 50 cm. How many repetitions of this exercise are equivalent to 10 minutes of running in place? Assume that the person uses negligible energy in letting down the weights after each lift. (1 cal = 4.186 J)
A. 730 B. 1450 C. 1500 D. 2200 E. 2900