Suppose we wrap a solenoid coil around a hollow cardboard cylinder. Now suppose that we insert an iron core into the solenoid. What will happen to the coil’s inductance when we insert the iron core? (Explain.)
A. The inductance increases.
B. The inductance decreases.
C. The inductance is unchanged.
D. One needs more information to answer the question.
A. The inductance increases.
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A spring with a spring constant of 8.0 N/m is compressed to 20 cm. If the spring is uncompressed initially, then the work done is
A. 0.12 J. B. 0.16 J. C. 0.19 J. D. 0.22 J. E. 0.26 J.
The Chandrasekhar mass limit is:
A) .08 solar masses. B) .4 solar masses. C) 1.4 solar masses. D) 3 solar masses. E) 8 solar masses.
Four resistors having resistances of 20 ?, 40 ?, 60 ?, and 80 ? are connected in series across an ideal 50-V dc source
What is the current through each resistor? A) 0.25 A B) 4.0 A C) 0.75 A D) 2.0 A E) 0.50 A
A 620-g object traveling at 2.1 m/s collides head-on with a 320-g object traveling in the opposite direction at 3.8 m/s. If the collision is perfectly elastic, what is the change in the kinetic energy of the 620-g object?
A) It loses 0.23 J. B) It gains 0.69 J. C) It loses 0.47 J. D) It loses 1.4 J. E) The energy of the object is unchanged.