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3 years ago

The power of a machine is 6000 W. This machine is scheduled for design improvements. Engineers have reduced the

Physics

1 answer:

Georgia [21]3 years ago

7 0

Explanation:

Work = power × time

W = (6000 W) (7.5 s)

W = 45,000 J

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A power transmission line is hung from metal towers with glass insulators having a resistance of 1.00×109 Ω . What current flows

Hunter-Best [27]

Answer:

The current flows through the insulator is 2 mA.

Explanation:

Given that,

Resistance $R=1.00\times10^{9}\ \Omega$

Voltage = 200 kV

We need to calculate the current

Using ohm's law

$V=IR$

$I=\dfrac{V}{R}$

Where, I = current

V = voltage

R = resistance

Put the value into the formula

$I=\dfrac{200\times10^{3}}{1.00\times10^{9}}$

$I=0.0002\ A$

$I=2\ mA$

Hence, The current flows through the insulator is 2 mA.

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3 years ago

Which of the following are NOT two of the best ways to StaySafe around electricity?

creativ13 [48]

1) Sleeping with an electronic in charge right next to you.

2) Leaving a charger plugged in all the time especially near liquid substances.

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2 years ago

A material that provides resistance to the flow of electric current is called a(an)

stira [4]

An insulator is a material that provides resistance to the flow of electric current. Insulators include rubber, plastic, glass since they do not allow electricity to flow through them.

8 0

3 years ago

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A charge q = 3 × 10-6 C of mass m = 2 × 10-6 kg, and speed v = 5 × 106 m/s enters a uniform magnetic field. The mass experiences

NeX [460]

Answer:

Magnetic field, B = 0.004 mT

Explanation:

It is given that,

Charge, $q=3\times 10^{-6}\ C$

Mass of charge particle, $m=2\times 10^{-6}\ C$

Speed, $v=5\times 10^{6}\ m/s$

Acceleration, $a=3\times 10^{4}\ m/s^2$

We need to find the minimum magnetic field that would produce such an acceleration. So,

$ma=qvB\ sin\theta$

For minimum magnetic field,

$ma=qvB$

$B=\dfrac{ma}{qv}$

$B=\dfrac{2\times 10^{-6}\ C\times 3\times 10^{4}\ m/s^2}{3\times 10^{-6}\ C\times 5\times 10^{6}\ m/s}$

B = 0.004 T

B = 4 mT

So, the magnetic field produce such an acceleration at 4 mT. Hence, this is the required solution.

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3 years ago

Give an example of how friction can be used and an example of how friction can be harmful

DaniilM [7]

Answer:

friction can be used to slow things down but it can also be harmful because it can cause fire to start

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3 years ago

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