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aleksley [76]
3 years ago
14

If 170 degrees F air feels warm and comfortable to us, why does swimming in 70 degree F water feel cold ?

Physics
1 answer:
Advocard [28]3 years ago
3 0

Your body loses heat to the water faster than it loses heat to the air. Water has a higher heat capacity, so it is better at extracting heat than air is.

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Compare and contrast potential and kinetic energy
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3 years ago
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This is for Lipor only.
Andre45 [30]

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Explanation:

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An electron and a proton have charges of an equal magnitude but opposite sign of 1.60 x 10^-19 C. If the electron and proton in
ira [324]

Answer:

i. F =  1.3 x 10^{-7} N

ii. The direction of the force of attraction exerted by the proton on the electron is towards the itself (i.e a pull).

Explanation:

Since the given charges are opposite, then the force of attraction is experienced. The force of attraction between the two charges can be determined by:

F = \frac{kq_{1} q_{2} }{d^{2} }

where F is the force, k is the constant, q_{1} is the charge of the electron, q_{2} is the charge on the proton, and d is the distance between them.

So that; k = 9.0 x 10^{9} Nm^{2}C^{-2} , q_{1} = 1.6 x 10^{-19} C, q_{2} = 1.6 x

Thus,

F = \frac{9.0*10^{9}*1.6*10^{-19}*1.6*10^{-19}   }{(4.2*10^{-11}) ^{2} }

  = \frac{2.304*10^{-28} }{1.764*10^{-21} }

  = 1.3061 x 10^{-7}

F = 1.3 x 10^{-7} N

The force between the charges is 1.3 x 10^{-7} N.

ii. The direction of the force of attraction exerted by the proton on the electron is towards the itself.

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Myra kicked the stone with an initial speed of 8.15 m/s at an angle of 30° above the horizontal.
irakobra [83]

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What does elastic collision mean?
OLga [1]
An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies after the encounter is equal to their total kinetic energy before the encounter. Elastic collisions occur only if there is no net conversion of kinetic energy into other forms (such as heat or noise).
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