Two people sit face to face on nice skateboards that are free to roll without friction. They push each other with a force of 40 N and move apart. Person X, whose mass (including the skateboard) is 50 kg, moves to the left at 3 m/s. Person Z, whose mass (including the skateboard) is 60 kg,
A. moves to the right at 1 m/s.
B. moves to the right at 10 m/s.
C. moves to the right at 2.5 m/s.
D. moves to the right at 4 m/s.
Answer: C
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The flux density divided by the applied magnetic field strength is equal to the magnetic _________.
Fill in the blank(s) with the appropriate word(s).
What do we mean when we say that the universe is expanding?
A) Everything in the universe is gradually growing in size. B) Within galaxies, average distances between star systems are increasing with time. C) The statement is not meant to be literal; rather, it means that our knowledge of the universe is growing. D) Average distances between galaxies are increasing with time.
If we compress the entire history of the into one year, each day represents
A) about a billion years B) a few tens of millions of years C) a few hundred years D) a few million years
Dielectrics: A parallel-plate capacitor consists of two parallel, square plates having dimensions 1.0 cm by 1.0 cm. The plates are separated by 1.0 mm, and the space between them is filled with Teflon, which has a dielectric constant of 2.1. What is the capacitance of this capacitor? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 1.9 pF B. 0.44 pF C. 2.1 pF D. 0.88 pF