In a circuit, a current of 1.10 A is drawn from a battery. The current then divides and passes through two resistors in parallel. One of the resistors has a value of 66 ? and the current through it is 0.480 A. What is the value of the other resistor?
a. 28.8 ?
b. 51.1 ?
c. 151 ?
d. 20.1 ?
b
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Latent Heats: The figure shows a graph of the temperature of a pure substance as a function of time as heat is added to it at a constant rate in a closed container. If LF is the latent heat of fusion of this substance and LV is its latent heat of vaporization, what is the value of the ratio LV/LF?
A. 5.0 B. 4.5 C. 7.2 D. 3.5 E. 1.5
Which one of the following is TRUE?
A) Most elliptical galaxies contain only young stars. B) Barred spiral galaxies have similar properties to normal spirals, except for the "bar" feature. C) Galaxy collisions destroy most of the stars in the galaxies involved. D) Irregular galaxies rarely have star formation taking place in them. E) Most galaxies appear to be approaching the Milky Way Galaxy.
According to the principle of equivalence, observations made of falling objects at Galileo's Leaning Tower of Pisa are indistinguishable from observations made in
A) a spaceship orbiting in a gravitational field. B) a spaceship accelerating at g in deep space. C) any uniformly moving reference frame. D) all of the above E) none of the above
A collection of atoms has 20% of the sample in a state 5.9 eV above the ground state
If these emit coherent radiation, what is the wavelength of the laser light produced? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 210 nm B) 91 nm C) 340 nm D) 34 nm