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olya-2409 [2.1K]

2 years ago

15

Proof of conservation of energy

1 answer:

frutty [35]2 years ago

6 0

If you compare the energy at two different times in an equation, you'll see no difference, because it's been conserved. The total energy of a system is the sum of its energy in motion - its kinetic energy - and its energy due to its position, which is its potential energy

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Which material is the best heat insulator?<br><br> metal<br><br> wood<br><br> plastic<br><br> glass

OlgaM077 [116]

Of the materials listed wood is the best insulator. It would be the least hot if exposed to similar temperatures.

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2 years ago

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A silver wire 2.6 mm in diameter transfers a charge of 420 C in 80 min. Silver contains 5.8 x 10- free electrons per cubic meter

kifflom [539]

Answer:

a). 87.5 mA or $87.5 x10^{-3}$ A

b). 1.78 $\frac{m}{s}$

Explanation:

$d=2.6 mm \\Q=420C\\t=80min\\n=5.8x10^{28} \\q=1.6x10^{-19}$

n the number of free electrons is 28 in text reference and if they don't give q is take as the charge of electron.

a).

$I=\frac{Q}{t}\\ I= \frac{420 C}{80 min}*\frac{1min}{60 s} =\frac{420 C}{4800s}\\ I=87.5 x10^{-3}$ A

b).

$I=n*abs (q)*V_{d}*A$

$A= \pi * (\frac{d}{2})^{2} \\A=\pi (*\frac{2.6x10^{-3} m}{2})^{2} \\A=5.309x10^{-6}$

$V_{d} =\frac{I}{n*abs(q)*A} \\V_{d}=\frac{87.5 x10^{-2} }{5.8x^10{28} *1.6x^{-19} *5.3x^{6} }\\V_{d}=1.78 \frac{m}{s}$

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2 years ago

When two objects are at the same temperature and no heat flows this is called?

artcher [175]

Answer:

C: Thermal equilibrium

Explanation:

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What is the current hypothesis on how the earths moon formed

Gwar [14]

The earth and moon were created By a collision between two planetary objects Each five time the size of mars. Is the newest hypothesis.

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A circular coil 14.0 cm in diameter and containing nine loops lies flat on the ground. The Earth's magnetic field at this locati

sp2606 [1]

Answer:

a) $T = 2.9*10^{-5} N-m$

b) north edge will rise up

Explanation:

torque on the coil is given as

$T = NIABsin\theta$

where N is number of loop = 9 loops

i is current = 7.80 A

-B -earth magnetic field = $5.00*10^{-5} T$

A- area of circular coil

$A = \frac{\pi d^{2}}{4}$

$A =\frac{\pi .14^{2}}{4}$

A =0.015 m2

PUTITNG ALL VALUE TO GET TORQUE

$T = 9*7.8*0.015*5*10^{-5} sin{90-56}$

$T = 2.9*10^{-5} N-m$

b) north edge will rise up

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3 years ago

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