If you rub two transparency sheets with tissue and then hold the two transparency sheets at rest a short distance apart, they will then exert
A) a repulsive electric force on each other, but no magnetic force.
B) a repulsive magnetic force on each other, but no electric force.
C) an attractive electric force on each other, but no magnetic force.
D) an attractive magnetic force on each other, but no electric force.
E) no electric or magnetic forces on each other.
A
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If the electric field and magnetic field of an electromagnetic wave are given by E = E0 sin(kx - ?t) and B = B0 sin(kx - ?t), and if the value of E0 is 51 µV/m, what is the value of B0? (c = 3.0 × 108 m/s)
A) 1.7 × 1014 T B) 1.7 × 103 T C) 1.7 × 10-14 T D) 1.7 × 104 T E) 1.7 × 10-13 T
An object is placed 15. cm from a concave mirror of focal length 20. cm. If the object is 4.0 cm tall,
(a) where is the image formed? (b) how tall is it?
How long does it take our solar system to complete one orbit around the Milky Way Galaxy?
A) 100 million years B) 1 million years C) 230 thousand years D) 10 thousand years E) 230 million years
An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat. What is the change in the internal energy of the athlete?
A) -225 kJ B) -1075 kJ C) 1075 kJ D) 225 kJ E) 276 kJ