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3 years ago

What is the purpose of the material surrounding the metal inside the lamp cord?

2 answers:

5 0

The prongs on the plug and the wire inside the cord are metal but they are surrounded by plastic or rubber insulation so you do not get shocked when you touch the cord

alexdok [17]3 years ago

5 0

It is likely that you have noticed that most cords in electrical appliances are surrounded by a material that does not let the metal inside be in touch with us. However, you might not know the purpose of this material. The purpose of this material is to provide insulation. This means that the material is there to offer protection against the flow of an electric current, as well as to protect the metal from environmental threats.

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What do astonomers use to calculate the age of the universe

makvit [3.9K]

Answer: Stars

Explanation: Some stars have remained intact since the Big Bang. These stars are shown in something called the HR diagram with portrays the brightness and largeness of the star. Also, white dwarfs and black dwarfs can be traced back which may correspond with the initiation of the universe.

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3 years ago

What does gravitational potential energy depend on

Alex17521 [72]

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3 years ago

A coil 3.55 cm in radius, containing 470 turns, is placed in a uniform magnetic field that varies with time according to B=( 1.2

slavikrds [6]

The Electric current is 1.11* 10^{-4}A

Given that the coil's radius is 3.55 cm (0.35 m),

The formula for the coil's area is A = r2 A = (3.14) (0.35)2 = 0.005024 m2.

R = Resistance = 600 N = Number of spins = 500 B = Magnetic field = (0.0120)

t + (3 x 10⁻⁵) t⁴

The number t = 5 is substituted for taking the derivative at both the induced current and the electric current.

The Electric current is therefore 1.11* 10^{-4}A
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2 years ago

Read 2 more answers

An engine extracts 452.8kJ of heat from the burning of fuel each cycle, but rejects 266.7 kJ of heat (exhaust, friction,etc) dur

Svetlanka [38]

Answer: The thermal efficiency of the engine is 41.09 %.

Explanation:

Efficiency is the ratio of the useful work performed to the total energy expended or heat taken in.

Formula for thermal efficiency of engine is

$\eta=1- \frac{Q_2}{Q_1}\times 100$

$\eta$ = efficiency

${Q_2}$ = heat rejected = 266.7 kJ

${Q_1}$ = heat extracted = 452.8 kJ

Putting in the values we get:

$\eta=1- \frac{266.7 kJ}{452.8 kJ }\times 100$

$\eta=0.41\times 100$

$\eta =41.09\%$

The thermal efficiency of the engine is 41.09 %.

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4 years ago

Tom has built a large slingshot, but it is not working quite right. He thinks he can model the slingshot like an ideal spring wi

Amiraneli [1.4K]

Answer:

8.9

Explanation:

We can start by calculating the initial elastic potential energy of the spring. This is given by:

$U=\frac{1}{2}kx^2$ (1)

where

k = 35.0 N/m is the initial spring constant

x = 0.375 m is the compression of the spring

Solving the equation,

$U=\frac{1}{2}(35.0)(0.375)^2=2.5 J$

Later, the professor told the student that he needs an elastic potential energy of

U' = 22.0 J

to achieve his goal. Assuming that the compression of the spring will remain the same, this means that we can calculate the new spring constant that is needed to achieve this energy, by solving eq.(1) for k:

$k'=\frac{2U'}{x^2}=\frac{2(22.0)}{0.375^2}=313 N/m$

Therefore, Tom needs to increase the spring constant by a factor:

$\frac{k'}{k}=\frac{313}{35}=8.9$

7 0

4 years ago