keiannabmoss
21.02.2020 •
Physics
A wave pulse travels along a horizontal string. As the pulse passes a pint on the string, the point moves vertically up and then back down again. How does the vertical speed of the point compare to the speed of the wave?
• the speed of the point equals the speed multiplied by the wavelength and divided by the string's length.
• the wave speed equals the point speed multiplies by the wavelength and divided by the string's length.
• the speed of the point is 2 times greater than the wave speed.
• the speed of the point could be neglected compared to the wave speed.
• the wave speed could be neglected compared to the speed of the point.
• the speeds could not be uniquely compared, because there is no fixed relationship between them.
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Ответ:
heat energy = 8400 j, specific heat capacity of water (c) = 4.2j/g, mass = 200g
temp change = 8400/(4.2×200)
= 10°c
b. temperature change = 252000/(4.2×15000)
= 4°c