Problem 1: you go outside on a hot, sunny summer day and you feel the warm sun on your skin. what causes this warmth?
a. the sun heats the air directly around your skin.
b. waves of light carry energy directly to your skin.
c. light causes surface waves on your skin.
d. water vapor in the air warms your skin.
problem 2: when a water wave runs into you at the beach, what causes you to get knocked down?
a. air molecules in front of the wave
b. the wave's energy
c. periodic motion
d. friction
Answers: 1
Physics, 21.06.2019 20:20
Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?
Answers: 2
Physics, 21.06.2019 22:30
Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.
Answers: 1
Physics, 22.06.2019 07:20
Use the information presented in the graph to answer the questions. which segments show acceleration? which segment indicates that the object is slowing down? what is the velocity of segment b? what is the acceleration of segment b?
Answers: 3
Problem 1: you go outside on a hot, sunny summer day and you feel the warm sun on your skin. what c...
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