Why was the invention of the transistor so significant?
A. it both amplifies weak signals and can be used as a voltage-controlled switch
B. it increased the accuracy of computers
C. it replaced integrated circuits
D. it generated enough heat to eliminate heating devices in buildings
A. it both amplifies weak signals and can be used as a voltage-controlled switch
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Which of the following statements is probably true about the very first stars in the universe?
A) They were made only from hydrogen and helium. B) They were made from pure energy. C) They were probably orbited only by terrestrial planets, but no jovian planets. D) They were made approximately of 98% hydrogen and helium, and 2% of heavier elements.
When we breathe we inhale oxygen, Image, and exhale carbon dioxide, Image, plus water vapor, ImageO. Which likely has more mass, the air that we inhale or the same volume of air we exhale? Does breathing cause you to lose or gain weight?
A) The air we inhale has more mass; Breathing causes you to lose weight. B) The air we exhale has more mass; Breathing causes you to lose weight. C) The air we inhale has more mass; Breathing causes you to gain weight. D) The air we exhale has more mass; Breathing causes you to gain weight.
A rod (length = 10 cm) moves on two horizontal frictionless conducting rails, as shown. The magnetic field in the region is directed perpendicularly to the plane of the rails and is uniform and constant. If a constant force of 0.60 N moves the bar at a constant velocity of 2.0 m/s, what is the current through the 12-? load resistor?
a.
0.32 A
b.
0.34 A
c.
0.37 A
d.
0.39 A
e.
0.43 A
A planar loop consisting of four turns of wire, each of which encloses 200 cm2, is oriented perpendicularly to a magnetic field that increases uniformly in magnitude from 10 mT to 25 mT in a time of 5.0 ms. What is the resulting induced current in the coil if the resistance of the coil is 5.0 W?
a. 60 mA b. 12 mA c. 0.24 mA d. 48 mA e. 6.0 mA