I wish to use a positively charged rod to charge a ball by induction. Which statement is correct?
a. The ball is charged as the area of contact between the two increases.
b. The ball must be a conductor.
c. The ball must be an insulator that is connected temporarily to the ground. d. The charge on the ball will be positive.
B
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The second law of thermodynamics leads us to conclude that
A) the total energy of the universe is constant. B) disorder in the universe is increasing with the passage of time. C) it is theoretically possible to convert heat into work with 100% efficiency. D) the average temperature of the universe is increasing with the passage of time.
What is spectroscopy?
A) An analysis of the way in which atoms absorb and emit light B) A study of the geometry of rainbows C) An observational technique to measure the brightness of light at different colors D) The use of CCDs to capture light more efficiently than with photographic film E) A method to freeze atmospheric turbulence for better resolution
Faraday's Law: A flat square coil of wire with 15 turns and an area of 0.40 m2 is placed with the plane of its area parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in a time of 0.050 s. What is the magnitude of the average induced emf in the coil?
A. 6.0 V B. 36 V C. 45 V D. 90 V
There is no upper limit to the mass of a neutron star
Indicate whether the statement is true or false