If a galaxy has a radial velocity of 8000 km/s and the Hubble constant is 70 km/s/Mpc, what is the distance to this galaxy?
a. 8.75 × 10^3 Mpc
b. 2.4 × 10^9 Mpc
c. 5.6 × 10^5 Mpc
d. 114 Mpc
e. 8.75 × 10^-3 Mpc
d
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Photography Optics: The focal length of the lens of a simple film camera is 40.0 mm. By what amount should the distance between the lens and the film be increased or decreased to change the focus from a person who is 25 m from the lens to one who is 4.0 m from the lens?
A. 0.2 mm B. 0.3 mm C. 0.4 mm D. 0.5 mm E. 0.7 mm
A conducting hollow cylinder (inner radius = a, outer radius = b) carries a current of 40 A that is uniformly distributed over the cross section of the conductor. If a = 3.0 mm and b = 6.0 mm, what is the magnitude of the (line) integral 
around a circular path (radius = 5.0 mm) centered on the axis of the cylinder and in a plane perpendicular to that axis?
A. 50 ?T ? m B. 30 ?T ? m C. 22 ?T ? m D. 37 ?T ? m E. 47 ?T ? m
Why must the Sun's rate of fusion gradually rise over billions of years?
A) The Sun becomes less efficient and must increase the rate of fusion to produce the same amount of energy. B) Fusion reactions decrease the overall number of particles in the core, causing the core to shrink, converting gravitational potential energy into thermal energy, and increasing the rate of fusion. C) The radiation produced by fusion reactions that is trapped in the core gradually raises the temperature, increasing the rate of fusion. D) The Sun gets heavier as it gets older, and the stronger inward pull of gravity increases the fusion rate. E) The rate of fusion is not rising; it is actually decreasing over time.
What is the ultimate fate of an isolated white dwarf?
A) It will cool down and become gradually dimmer. B) As gravity overwhelms the electron degeneracy pressure, it will explode as a nova. C) As gravity overwhelms the electron degeneracy pressure, it will explode as a supernova. D) As gravity overwhelms the electron degeneracy pressure, it will become a neutron star. E) The electron degeneracy pressure will eventually overwhelm gravity and the white dwarf will slowly evaporate.