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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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
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 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