Which of the following kind of stars is most dense?
a. a supergiant star
b. a main sequence star
c. a giant star
d. a white dwarf
e. the Sun
d
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The Aswan High Dam on the Nile River in Egypt is 111 m high. What is the gauge pressure in the water at the foot of the dam? The density of water is 1000 kg/m3
A) 1.11 × 102 Pa B) 1.09 × 106 Pa C) 1.11 × 105 Pa D) 1.09 × 103 Pa E) 1.16 × 106 Pa
When an initially uncharged capacitor is charged through a 25-k? resistor by a 75-V dc ideal power source, it takes 0.23 ms for the capacitor to reach 50% of its maximum charge? What is the capacitance of this capacitor?
What will be an ideal response?
Which of the following combinations of circuit components can be used to make a tuner for a radio, to select the desired frequency?
a. fixed capacitor, variable resistor c. fixed inductor, variable capacitor b. fixed resistor, variable inductor d. fixed inductor, variable resistor
Sally places an object 6.0 cm from a thin, convex lens along its axis. The lens has a focal length of 12 cm. What are the respective values of the image distance and magnification?
a. 12 cm and -2.0 c. 3.0 cm and -0.50 b. –12 cm and 2.0 d. -6.0 cm and -1.0