Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 2 sin (4x) cos (3t) where x is in m and t is in s. What is the speed (in m/s) of the interfering waves?
a. 0.75
b. 0.25
c. 1.3
d. 12
e. 3.0
a
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What is the binding energy per nucleon for Al? The neutral Al atom has a mass of 26.981539 u; a neutral hydrogen atom has a mass of 1.007825 u; a neutron has a mass of 1.008665 u; and a proton has a mass of 1.007277 u. 1 u = 931.494 MeV/c2
A) 8.3 MeV B) 6.7 MeV C) 5.4 MeV D) 3.4 MeV E) 2.8 MeV
Which of the following sequences correctly describes the stages of life for a low-mass star?
A) protostar, red giant, main-sequence, white dwarf B) protostar, main-sequence, white dwarf, red giant C) white dwarf, main-sequence, red giant, protostar D) protostar, main-sequence, red giant, white dwarf E) red giant, protostar, main-sequence, white dwarf
The first spacecraft to drop a weather probe into Jupiter's atmosphere was:
A) Cassini. B) Global Surveyor. C) Voyager 2. D) Viking 1. E) Galileo.
The direction of the force on a current carrying wire located in an external magnetic field is which of the following?
a. perpendicular to the current b. perpendicular to the field c. Both choices A and B are valid. d. None of the above are valid.