Terminal Voltage and Internal Resistance: A circuit contains two batteries and a 2.0-? resistor as shown in the figure. The emfs and internal resistances of these batteries are indicated in the figure, and all numbers are accurate to two significant figures. What are the terminal voltages of (a) the 6.0-V battery and (b) the 12-V battery?
What will be an ideal response?
(a) -1.2 V (the terminal polarity is opposite from the polarity of the internal emf) (b) 8.4 V
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Absorption lines in the spectra of supergiant stars are broader than the same spectral lines in main-sequence stars of the same spectral type
a. True b. False Indicate whether the statement is true or false
A 1.0-g bead is at (-2.0 cm, 2.0 cm), a 2.0-g bead is at (2.0 cm, -4.0 cm), and a 3.0-g bead is at (2.0 cm, 0.0 cm). What are the coordinates of the center of mass (or center of gravity) of this system of beads?
What will be an ideal response?
A solar eclipse can only happen during a
A) new Moon. B) solstice. C) first quarter Moon. D) full Moon. E) perihelion passage of the Sun.
Which of the following is not a number that corresponds to the filling of a nuclear shell?
A. 8 B. 18 C. 50 D. 82 E. 126