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SVETLANKA909090 [29]

4 years ago

11

Pls help

1 answer:

konstantin123 [22]4 years ago

6 0

Answer:

Q

Explanation:

The atoms of a substance LOSE ENERGY during a change of state but before the atoms of a substance lose energy during a change of state but are still able to slide past one another

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"Which of the following best describes the circuit shown below?

Anettt [7]

The figure shown above is series combination as the two resistors (bulb) are there which are then connected to the battery
so i conclude from the above options given the option is B
hope it helps

3 0

3 years ago

Read 2 more answers

After the water has boiled, the temperature of the water decreases by 22 °C.

Leviafan [203]

Explanation:

Use the formula:

$e = mc \delta \theta$

e is the energy released,

m is the mass of water,

c is the specific heat capacity,

δθ is the change in temperature ( 100 - 22)

4 0

3 years ago

A sprinter has a mass of 80kg and a kinetic energy of 4000 j. What is the sprinter's speed

JulijaS [17]

The formula of the kinetic energy is KE = 0.5*m*v^2.
Given m = 80 kg and KE = 4000 J,
4000 = 0.5*80*v^2
v^2 = 100
v = 10 m/s

4 0

3 years ago

A copper transmission cable 140 {\rm km} long and 12.5 {\rm cm} in diameter carries a current of 115 {\rm A}.

SpyIntel [72]

Answer:

1. $V=22.0407\ V$

2. $Q=9126837\ J$

Explanation:

Given:

length of copper cable, $l=140\ km=1.4\times 10^5\ m$

diameter of copper cable, $d=12.5\ cm=0.125\ m$

current through the copper wire, $i=115\ A$

We have the resistivity of copper, $\rho=1.68\times10^{-8}\ \Omega.m$

<u>We know that the resistance of a wire is given as:</u>

$R=\rho.\frac{l}{a}$

where:

$a=$ cross sectional area of the wire

$R=1.68\times 10^{-8}\times\frac{140000}{\pi.\frac{0.125^2}{4} }$

$R=0.1917\ \Omega$

1.

<u>Now from the Ohm's law:</u>

$V=R.i$

$V=0.1917\times 115$

$V=22.0407\ V$

2.

<u>From the Joules law the thermal energy generated as an effect of electrical energy is mathematically given as:</u>

<u /> $Q=i^2.R.t$

where:

$t=$ time duration for which the current flows

$Q=115^2\times 0.1917\times 3600$ (∵ we have 3600 seconds in 1 hour)

$Q=9126837\ J$

5 0

3 years ago

Select the correct answer.

Nina [5.8K]

Answer:

Ос.

The spacing between particles increases.

Heat causes greater particle activity, and the particles

are farther apart.

3 0

3 years ago