Two objects with different sizes, masses, and temperatures are placed in thermal contact. Choose the best answer. Energy travels
1.from the larger object to the smaller object.
2.from the object with more mass to the one with less mass.
3.from the object at higher temperature to the object at lower temperature.
3
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The most effective wavelengths to see through the clouds of Venus to the surface are ________
Fill in the blank(s) with correct word
Suppose Earth collapsed down to one-tenth of its present radius, while retaining all of its present mass. Compared to your present mass, your mass would be
A) reduced by a factor of 100. B) unchanged. C) reduced by a factor of 10. D) increased by a factor of 10. E) increased by a factor of 100.
Two uniform rods, each of length 2.0 m, are bent to form semicircles. One rod has a charger per unit lent of 1.5 nC/m, and the other has a charge per unit length of –1.5 nC/m. The semicircles are joined to make a circle. What is the magnitude of the electric field at the center of the circle?
a. 42 N/C b. 84 N/C c. 34 N/C d. 68 N/C e. 0
The minimum energy that a photon must have to undergo pair production is
A. 0.511 MeV. B. 1.022 MeV. C. 2.044 MeV. D. 0.256 MeV. E. any amount more than zero.