If a piece of iron and a cup of water at the same temperature are heated so the internal energy of each doubles
A) the water will have the higher temperature.
B) the iron will have the higher temperature.
C) both will have the same temperature.
D) need more information
Answer: B
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Why does neutron capture work?
A) Neutrons have no repulsive barrier to overcome in combining with positively charged nuclei. B) Neutrinos, because of their low mass and high speed, easily penetrate nuclei. C) Single protons have little repulsion to heavy nuclei and easily fuse with them. D) Photodisintegration makes many alpha particles, available for capture by nuclei. E) Neutronization captures all the protons and electrons.
Water flows over a 2-m-wide flat plate with the same velocities as in Problem 4 in the mini-exam for Section 4.4 where we found v = 0.0667 m/s. The frictional force F acting on the horizontal surface is nearest:
(A) 1300 N
(B) 1500 N
(C) 1700 N
(D) 1900 N
The charge carried by one electron is e = -1.6 × 10-19 C. The number of electrons necessary to produce a charge of -1.0 C is
A) 6.3 × 1018. B) 6.3 × 109. C) 1.6 × 1019. D) 1.6 × 109. E) none of the above
Explain the relationship between the terms significant figure and significant digit