The length of a certain wire is doubled while its radius is kept constant. What is the change in the resistance of this wire?
A) It stays the same.
B) It is doubled.
C) It is tripled.
D) It is quadrupled.
E) It is reduced by a factor of 2.
B
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Hubble's Law states that v = H0d, and current measurements indicate that H0 ? 22 kilometers per second per million light-years. About how far away is a galaxy with a redshift indicating that it is moving away from us at 2200 kilometers per second?
A) 100 million light-years B) 200 million light-years C) 200 light-years D) 100 light-years
When the outer envelope of a red giant is ejected, the remaining exposed core of a low mass star is called a
A. black hole. B. white dwarf. C. neutron star. D. red super giant.
A longitudinal wave travels on a slinky or any long spring. The wave is represented by the equation x(x, t) = 2.10 cm cos(2000 rad/s t + 40.0 
x). What is the velocity of the wave?
A. 500 m/s in the + x direction B. 500 m/s in the - x direction C. 200 m/s in the + x direction D. 200 m/s in the - x direction
What is the magnitude of the magnetic force on a charged particle (Q = 5.0 ?C) moving with a speed of 80 km/s in the positive x direction at a point where Bx = 5.0 T, By = ?4.0 T, and Bz = 3.0 T?
a. 2.8 N b. 1.6 N c. 1.2 N d. 2.0 N e. 0.4 N