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3 years ago

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I am in 8th grade k12 pls help How is the temperature affected (increased or decreased) when the iron block is placed in the wat

er?
a. the iron black (temp increase or decrease)

b. the water (temp increase or decrease)

Question 3 options:
Blank # 1
Blank # 2

1 answer:

postnew [5]3 years ago

4 0

A? There isn’t much important information

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Which statement provides the most complete description of an object's motion?

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3 years ago

4. A high school athlete runs 400 m in 52.20 sec. What is his speed in mph?<br> 14100<br> 1110

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28,800m/p second

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3 years ago

A solenoid that is 78.8 cm long has a cross-sectional area of 15.9 cm2. There are 914 turns of wire carrying a current of 8.25 A

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Answer:

(a) Energy density will be equal to $57.31J/m^3$

(b) Total energy will be equal to 0.0718 J

Explanation:

It is given that length of solenoid l = 78.8 cm = 0.788 m

Cross sectional area $A=15.9cm^2=15.9\times 10^{-4}m^2$

Number of turns of the wire N = 914

Current in the solenoid i = 8.25 A

Inductance of the wire is equal to $L=\frac{\mu _0N^2A}{l}=\frac{4\pi \times 10^{-7}\times 914^2\times 15.9\times 10^{-4}}{0.788}=2.117\times 10^{-3}H$

(b) Total energy stored in magnetic field $U=\frac{1}{2}Li^2=\frac{1}{2}\times 2.11\times 10^{-3}\times 8.25^2=0.0718J$

(a) Energy density will be equal to

$U_b=\frac{0.0718}{15.9\times 10^{-4}\times 0.788}=57.31J/m^3$

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3 years ago