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iren2701 [21]
3 years ago
10

How much heat is absorbed by a 43g iron skillet when its temperature rises from 8oC to 28oC?

Physics
1 answer:
julia-pushkina [17]3 years ago
8 0
Using the specific heat of 0.45 kJ/g • oC, you multiply .45 and 43. This gets you 19.35 kJ or
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A proton and an electron in a hydrogen atom are separated on the average by about 5.3 × 10−11 m. What is the magnitude and direc
Genrish500 [490]

Answer:

1. 5.12068 × 1011 N/C away from the proton

Explanation:

The electric field produced by a single point charge is given by:

E=k\frac{q}{r^2}

where

k is the Coulomb's constant

q is the magnitude of the charge

r is the distance from the charge

In this problem, we have:

q=1.6\cdot 10^{-19}C is the charge of the proton

r=5.3\cdot 10^{-11} m is the distance at which we want to calculate the field

k=8.99\cdot 10^9 Nm^2C^{-2} is the Coulomb's constant

Substituting into the formula,

E=(8.99\cdot 10^9 Nm^2C^{-2})\frac{1.6\cdot 10^{-19}C}{(5.3\cdot 10^{-11}m)^2}=5.12068\cdot 10^{11} N/C

And the direction of the electric field produced by a positive charge is away from the charge, so the correct answer is

1. 5.12068 × 1011 N/C away from the proton

4 0
4 years ago
Which characteristic accounts for the fact that red lights are used in dark rooms and DO NOT expose negatives during developing?
andriy [413]
B) low energy, because red is on the far left of the electromagnetic spectrum.
6 0
3 years ago
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The hair dryer has a plastic case so there is no need for an earth wire connection in the plug ,explain why the hair dryer is st
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Answer:

plastics are unable to conduct electricity and heat due to there being no free flowing electrons, meaning they are safe to use.

Explanation:

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3 years ago
Witch scientist concluded that plants are made up of cells?
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The focal length of a concave lens 13.3 cm.Calculate its power.​
cricket20 [7]

Explanation:

Formula for finding power : 1/f

Substitution of values:

1 /13.3 = 0.07518 cm

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