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3 years ago

Which statement best answers the question, "Why is copper a good conductor of electricity?"?

2 answers:

5 0

Each copper atom loses one electron and becomes a positive ion, so copper is a like a net of positive ions with free electrons moving about.They're also known as conduction electrons, because they help copper to be a good conductor of heat and electricity.

So the answer is A, I believe!

Yanka [14]3 years ago

4 0

C copper has an equal amount of protons allowing electricity to move freely through it

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A crane used 250,000 Joules of work to move a beam to the top of a building in 20 seconds. How much power did the crane use?

maria [59]

Answer:

12500W

Explanation:

Given parameters:

Work done = 250000J

Time taken = 20s

Unknown:

Power of the crane = ?

Solution:

Power is the defined as the rate at which work is being done;

Mathematically;

Power = $\frac{work done}{time }$

insert the parameters and solve;

Power = $\frac{250000}{20}$ = 12500W

7 0

3 years ago

An iron anchor of density 7890.00 kg/m3 appears 299 N lighter in water than in air. (a) What is the volume of the anchor? (b) Ho

PtichkaEL [24]

Answer:

weigh is 2353.13 N

Explanation:

Given data

density = 7890.00 kg/m3

lighter = 299 N

to find out

the volume of the anchor and weigh in air

solution

from question we can say that

apparent weight = actual weight - buoyant force

we know weight = mg and buoyant force = water density × g

so volume of anchor is = actual weight - apparent weight / buoyant force

volume of anchor is = 299 / 1000 × 9.81

volume of anchor is = 0.0304791 m³

and

weight of anchor is mg

here mass m = density Fe g

density Fe = 7870 from table 14-1

so weight = 7870 × 0.0304791 × 9.81

weigh is 2353.13 N

7 0

4 years ago

Assuming the earth is a uniform sphere of mass M and radius R, show that the acceleration of fall at the earth's surface is give

Keith_Richards [23]

Explanation:

The weight of an object on the surface of the earth is equal to the gravitational force exerted by the earth on the object.

$W=F_G$

$mg = G \dfrac{mM}{R^2}$

which gives us an expression for the acceleration due to gravity <em>g</em> as

$g = G\dfrac{M}{R^2}$

At a height h = R, the radius of a satellite's orbit is 2R. Then the acceleration due to gravity $g_h$ at this height is

$mg_h = G \dfrac{mM}{(2R)^2}= G \dfrac{mM}{4R^2}$

Simplifying this, we get

$g_h= G \dfrac{M}{4R^2} = \dfrac{1}{4} \left(G \dfrac{M}{R^2} \right) = \dfrac{1}{4}g$

3 0

3 years ago

Does a wire connected to a dc source, such as a battery, emit an electromagnetic wave?

Lina20 [59]

The wire connected to the DC source doesn't emit electromagnetic waves.

The electromagnetic wave is an oscillation of electric fields and magnets field that sustains each other, this wave time has the characteristics that it can travel without a material medium, for which they are of extreme importance.

It is caused by DC sources such as batteries only having a constant voltage, it is different from AC sources which have different voltage over time, AC voltage can induce the wire because AC sources have magnetic flux change. DC sources don't have magnetic flux change so they don't emit electromagnetic waves.

Learn more electromagnetic waves at: brainly.com/question/25847009

#SPJ4

7 0

2 years ago

State the objects in the universe that reflect light from stars

stepan [7]

Everything in the universe that is not a star reflects light from Stars. Otherwise you can't see it.

7 0

4 years ago