Four of the five answers listed below are aspects of the scientific method. Select the exception
a. observation
b. hypothesis
c. experimentation
d. philosophy
e. conclusion
d
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H I clouds can be observed using _____
a. optical telescopes above the earth's atmosphere b. 21-cm radiation c. x-ray radiation d. infrared radiation e. ultraviolet radiation
Which of the following statements is true?
A: Nothing can travel faster than the speed of light B: There is a black hole at the center of our Solar System C: If the Sun were magically to turn into a black hole, Earth's orbit would immediately change D: Although visible light cannot escape from inside the event horizon of a black hole, high energy radiation, such as gamma rays, can escape E: Black holes defy the laws of gravity
A particle whose mass is 2 kg moves in the xy plane with a constant speed of 3 m/s along the direction 
. What is its angular momentum (in kg?m2/s) relative to the origin?
A.
B.
C.
D.
E.
Tarzan swings back and forth on a long vine. His friend Jane notices in amazement that he makes 30 complete swings in 2.4 minutes
(a) What is the frequency (in hertz) of Tarzan's swing? (b) How long is the vine he is using? What will be an ideal response?