The additional energy given off by active galaxies is because of their higher stellar density
Indicate whether the statement is true or false
FALSE
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A primitive space heater consists of a 10.0 cm radius iron ball through which electrical current was passed in order to heat the ball and subsequently the surrounding air. If the temperature of the iron ball was kept at 530 K and the room temperature was 
what power would be radiated into the room? Assume the ball is a perfect blackbody.
A. 140 W B. 110 W C. 430 W D. 480 W
An older model car accelerates from rest to speed v in 10 seconds. A newer, more powerful sports car accelerates from rest to speed 2v in half the time (5 seconds). What is the ratio of the power of the newer car to that of the older car?
1.0.125 2.1.0 3.4.0 4.8.0
Complete the reaction: e + p ? _______________; the reaction applies to ________________
a. n, white dwarfs b. ?, neutron stars c. n + ?, white dwarfs d. n + ?, neutron stars
A string of length 2.5 m is fixed at both ends. When the string vibrates at a frequency of 85 Hz, a standing wave with five loops is formed
(a) Determine the distance between two adjacent nodes. (b) Determine the wavelength of the waves that travel on the string. (c) Determine the speed of traveling waves on this string. (d) Determine the fundamental frequency of this string.