What is true of the Local Group?
A) It contains about 2500 galaxies.
B) The Andromeda galaxy is a satellite of the Milky Way.
C) The Andromeda galaxy (M31), and the Milky Way are the two largest galaxies.
D) The giant ellipticals are the largest members.
E) It consists of mostly spirals.
C
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How is the refractive power, P, of a lens related to its focal length, f?
A. P = f B. P = 1/f C. P = 2*f D. P = f2
A thermally isolated system is made up of a hot piece of aluminum and a cold piece of copper, with the aluminum and the copper in thermal contact. The specific heat capacity of aluminum is more than double that of copper
Which object experiences the greater magnitude gain or loss of heat during the time the system takes to reach thermal equilibrium? A) the aluminum B) the copper C) Neither one; both of them experience the same size gain or loss of heat. D) It is impossible to tell without knowing the masses. E) It is impossible to tell without knowing the volumes.
A long solenoid has a radius of 4.0 cm and has 800 turns/m. If the current in the solenoid is increasing at the rate of 3.0 A/s, what is the magnitude of the induced electric field at a point 2.2 cm from the axis of the solenoid?
a. 3.3 × 10^?5 V/m b. 3.6 × 10^?5 V/m c. 3.9 × 10^?5 V/m d. 4.2 × 10^?5 V/m e. 6.0 × 10^?5 V/m
Each of two parallel wires separated by 6.0 mm carries a 40-A current. These two currents are in the same direction. Determine the magnitude of the magnetic field at a point that is 5.0 mm from each of the wires
a. 2.6 mT b. zero c. 1.9 mT d. 1.6 mT e. 3.2 mT