If nuclear reactions in the core produce harmful gamma rays, why are Earthlings not destroyed?
A: Our super skin protects us.
B: We are continually destroyed and then regenerated without knowing it.
C: The reactions really produce yellow light, not gamma rays.
D: The gamma rays are converted to visible light by the time they reach the photosphere.
E: None of the above.
Ans: D: The gamma rays are converted to visible light by the time they reach the photosphere.
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A long solenoid (n = 1500 turns/m) has a cross-sectional area of 0.40 m2 and a current given by I = (4.0 + 3.0t2) A, where t is in seconds. A flat circular coil (N = 300 turns) with a cross-sectional area of 0.15 m2 is inside and coaxial with the solenoid. What is the magnitude of the emf induced in the coil at t = 2.0 s?
A. 2.7 V B. 1.0 V C. 6.8 V D. 0.68 V E. 1.4 V
An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 15 cm past the first lens. The second lens has a focal length of 40 cm. Where is the final image formed?
A) 25 cm in front of the second lens B) 8 cm in front of the second lens C) 8 cm after the second lens D) 10 cm after the second lens E) 25 cm after the second lens
If you connect the circuit as shown in Fig. 19.1 in the Laboratory Guide with either resistor in place, but one fuse is removed from the circuit, this represents a circuit with a burned-out fuse. What is the voltage across the resistor? Explain your answer. V = ___________
Fill in the blank(s) with correct word
Motional Emf: As shown in the figure, a straight wire carries a steady current I. A metal bar is in contact with a pair of rails and is in upward motion with velocity of magnitude ?. The polarity of the induced emf in terminals X and Y is
A. X and Y are at the same potential. B. X is positive and Y is negative. C. Y is positive and X is negative.