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2 years ago

Which statement best describes copper?

Physics

1 answer:

ira [324]2 years ago

4 0

Answer:

D. It has a low resistance and allows charges to move freely.

Explanation:

The high conductivity of copper allow charges to move freely without the need of too much force. The conductivity decreases with increase in resistance. Low resistance also means less heating of the conductors. This property of copper makes it ideal for use in the manufacture of electric cables and conductors for various gadgets.

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Which of the following would have more momentum than fiona, a 313kg hippo, running at 8m/s?

kap26 [50]

Let's calculate the momentum of Fiona, given by the product between its mass and its speed:
$p=mv=(313 kg)(8 m/s)=2504 kg m/s$

Now let's compare it with the momentum of the other animals:
a) the mass of the sea turtle is missing, so we cannot calculate its momentum.
b) the momentum of the dolphin is
$p=mv=(150 kg)(18 m/s)=2700 kg m/s$
c) the momentum of the horse is
$p=mv=(380 kg)(4 m/s)=1520 kg m/s$
d) the momentum of the lion is
$p=mv=(190 kg)(11 m/s)=2090 m/s$

And we can see that the correct answer is b), because the momentum of the dolphin is greater than the momentum of Fiona.

5 0

2 years ago

A 0.5 kg turntable with a radius of 15 cm is rotating 78 times per minute.

alexandr1967 [171]

Answer:

Explanation:

8 0

1 year ago

Describe the laws of liquid pressure and Explain the term fluid. (Please give the correct answer, it's really urgent)

Alla [95]

Answer:

The laws of liquid pressure are

(i) Pressure inside the liquid increases with the depth from the free surface of the liquid.

(ii) Pressure is same at all points on a horizontal plane, in case of stationary liquid.

(iii) Pressure is same in all directions about a point inside the liquid.

(iv) Pressure at same depth is different in different liquids. It increases with the increase in the density of the liquid.

(v) A liquid will always seek its own level.

A Fluid is any liquid or gas or generally any material that cannot sustain a tangential, or shearing, force when at rest.

Explanation:

3 0

2 years ago

What is (4.2 x 10 to the fifth power) time (4.0 times 10 to the negative ninth power)

luda_lava [24]

(4.2*10^5)*(4*10^-9) = 1.68* 10^-3

8 0

2 years ago

Help . . . . . . . . . . . . . . . . . . . .

Zigmanuir [339]

Explanation:

Transmission

Reflection

Absorption

Refraction

Diffraction

4 0

2 years ago