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dlinn [17]
2 years ago
13

An atom with 4 protons, 5 neutrons, and 4 electrons has an atomic mass of _____ amu. (Enter a whole number.)

Physics
1 answer:
Oksi-84 [34.3K]2 years ago
6 0
Atomic mass = number of protons + number of neutrons = 4+5 = 9 amu
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Copper wire of diameter 0.289 cm is used to connect a set of appliances at 120 V, which draw 1850 W of power total. The resistiv
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Answer:

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Explanation:

Given;

diameter of the wire, d = 0.289 cm = 0.00289 m

voltage of the wire, V = 120 V

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A = 6.561 x 10⁻⁶ m²

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R = 0.067 Ω

Current in the wire is calculated as;

P = IV

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Power wasted = I²R

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d = 0.417 cm = 0.00417 m

A = πd²/4

A = (π x 0.00417²) / 4

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R = ρL / A

R = (1.68 x 10⁻⁸  x 26) / 1.366 x 10⁻⁵

R = 0.032 Ω

Power wasted = I²R

Power wasted = (15.417²)(0.032)

Power wasted = 7.61 W

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Explanation:

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