The density of a neutron star is
a. about the same as that of a white dwarf.
b. about the same as that of the sun.
c. about the same as an atomic nucleus.
d. zero
C
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An electron and a positron, which are two massive particles, can annihilate when they come together to produce two photons, which have no mass. According to special relativity, this pair annihilation is an example of __________
Fill in the blank(s) with correct word
If a nuclear fission reactor produces an average power of 1.0 GW over the course of a year,
what mass of 235U is used up for a 365-day year if 200 MeV are released per fission reaction? (1 eV = 1.60 × 10-19 J, mneutron ? mproton = 1.67 × 10-27 kg) A) 0.35 kg B) 3.3 × 108 kg C) 1.1 × 108 kg D) 390 kg E) 1.75 kg
Solenoid: An ideal solenoid 20 cm long is wound with 5000 turns of very thin wire. What strength magnetic field is produced at the center of the solenoid when a current of 10 A flows through it? (?0 = 4? × 10-7 T ? m/A)
A. 0.0063 T B. 0.20 T C. 3.2 T D. 4.8 T E. 0.31 T
A container of water is placed on a scale, and the scale reads 120. g. Now a 20.0g piece of copper (specific gravity = 8.90 ) is suspended from a thread and lowered into the water, not touching the bottom of the container
What will the scale now read? A) 140 g B) 120 g C) 138 g D) 122 g E) 112 g