The time before the Phanerozoic eon is collectively called ______________ time
Fill in the blank(s) with correct word
Precambrian
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A series circuit has equal values for resistance, capacitive reactance, and inductive reactance. The phase angle for this circuit is:
a. 60°. b. –60°. c. 180°. d. not given.
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
A spaceship takes a nonstop journey to a planet and returns in 10 hours according to a clock on the spaceship. If the speed of the spaceship is 0.80c, how much time has elapsed on the Earth?
A) 3.2 h B) 7.0 h C) 15 h D) 17 h E) 19 h
A 1.5 V flashlight battery, a 10 ohm resistor, and a flashlight lamp are available. How should the lamp be connected in a circuit so that it would glow the brightest?
A. Connect it in series with the resistor and battery so that the bulb is next to the positive terminal of the battery B. Connect it in parallel with the battery and the resistor C. Connect it directly to the battery; don't use the resistor D. Connect it in series with the resistor and battery so that the bulb is next to the negative terminal of the battery