Which of the following is not an exchange particle (that mediates the four fundamental forces of nature)?
A) gravitons
B) photons
C) leptons
D) weak bosons
E) gluons
C
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What determines how rapidly a star burns up its fuel?
A. the temperature in its core B. its mass C. its luminosity D. the pressure in its core E. All of these choices are correct.
A(n) ________ spectrum is created by a glowing, hot thin gas, such as M-42 in Orion
Fill in the blank(s) with correct word
A wave in which the particle displacement is parallel to the wave motion is called a(n) ______________ wave
Fill in the blank(s) with correct word
A 0.80-kg object tied to the end of a 2.0-m string swings as a pendulum. At the lowest point of its swing, the object has a kinetic energy of 10 J. Determine the speed of the object at the instant when the string makes an angle of 50° with the vertical
a. 5.6 m/s b. 4.4 m/s c. 3.3 m/s d. 5.0 m/s e. 6.1 m/s