The luminosity of a star is determined by the star's ________ and ________.
A. diameter; surface temperature
B. apparent brightness; surface temperature
C. brightness; temperature
D. distance; surface temperature
E. diameter; distance
Answer: A
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What type of galaxy was observed by Tully and Fisher?
The surface magnetic field of the Sun is found by measurement of the extra width in spectral lines due to the ________ Effect
Fill in the blank(s) with correct word
A particle (mass = 6.7 × 10^?27 kg, charge = 3.2 × 10^?19 C) moves along the positive x axis with a speed of 4.8 × 10^5 m/s. It enters a region of uniform electric field parallel to its motion and comes to rest after moving 2.0 m into the field. What is the magnitude of the electric field?
a. 2.0 kN/C b. 1.5 kN/C c. 1.2 kN/C d. 3.5 kN/C e. 2.4 kN/C
A 6.0-kg object moving 5.0 m/s collides with and sticks to a 2.0-kg object. After the collision the composite object is moving 2.0 m/s in a direction opposite to the initial direction of motion of the 6.0-kg object. Determine the speed of the 2.0-kg object before the collision
a. 15 m/s b. 7.0 m/s c. 8.0 m/s d. 23 m/s e. 11 m/s