A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5.0 sin (?t + ?/3). The velocity (in m/s) of the body at t = 1.0 s is
a. +7.9.
b. ?7.9.
c. ?14.
d. +14.
e. ?5.0.
b
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Resistance and Resistivity: When a 1.0-m length of metal wire is connected to a 1.5-V battery, a current of 8.0 mA flows through it. What is the diameter of the wire? The resistivity of the metal is 2.24 × 10-8 ? ? m.
A. 12 ?m B. 6.0 ?m C. 24 ?m D. 2.2 ?m
When atmospheric pressure changes, what happens to the absolute pressure at the bottom of a pool?
A) It does not change. B) It increases by a lesser amount. C) It increases by the same amount. D) It increases by a greater amount. E) It depends on the depth of the pool.
A double star system with each star having the mass of the Sun has an orbital period of 1 year. A second double star system, also with each star having the mass of the Sun, has an orbital period of 8 years. If the separation of the stars in the first system is d and the orbits in both cases are circular, what is the separation of the stars in the second system?
a. 0.5d c. 4d b. 2d d. 8d
Particles possessing half-integral spins are called _________ and particles with integral spins are called ________
a. quarks b. fermions c. bosons d. antiquarks