Suppose a particular star has a core that is undergoing several stages of fusion simultaneously, as shown in this diagram. Which of the following statements about this star is most likely to be true?
A) The star will explode as a supernova within a few days.
B) The star was born from a gas cloud with an unusually large proportion of elements heavier than hydrogen and helium.
C) The star is a red giant.
D) A million years from now, all that will remain of this star is a white dwarf.
A) The star will explode as a supernova within a few days.
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Thin Lenses: An object is placed 21 cm from a concave lens having a focal length of magnitude 25 cm. What is the magnification?
A. -0.54 B. 0.54 C. -0.32 D. -0.22 E. 0.22
The background hiss that Bell Labs detected was the best observational evidence for the Big Bang
Indicate whether the statement is true or false
The source of electrons lighting common lamps in your classroom is
1) the power company, 2) the electrical outlet, 3) atoms in the lamp filament, 4) the wires leading to the lamp, whereas the source of energy that lights a common lamp in your home is 5) the power company. 6) the electrical outlet. 7) atoms in the bulb filament. 8) the wires leading to the lamp.
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