The most modern definition of element is
a. a substance that cannot be further separated by chemical methods.
b. the simplest form of matter.
c. a substance in which all the atoms have the same number of protons.
d. a substance that contains no neutrons.
c
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A light beam from a 2.1-mW He-Ne laser has a wavelength of 633 nm. How many photons does the laser emit in one second? (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
A) 6.7 × 1015 B) 8.8 × 1015 C) 1.1 × 1016 D) 1.3 × 1016
Assume that the reference frame is moving with the person indicated in each of the following situations. In which case is the reference frame noninertial?
a. The person is walking at a constant speed along a straight, horizontal sidewalk. b. The person is walking at a constant speed along a straight sidewalk that is inclined downward at a slight unchanging angle. c. The person is riding an elevator upward at constant speed. d. The person is skydiving and is freefalling not yet having opened her parachute.
If the same impulse is applied to a ping-pong ball and a baseball, the change in the ping-pong ball's momentum will be ________ the baseball's.
What will be an ideal response?
The Hubble Space Telescope has been repaired
a. True b. False Indicate whether the statement is true or false