3 years ago

Cube A has a volume of 2cm x 2cm x 2cm. what is its density

1 answer:

8 0

The volume of the cube is (2cm x 2cm x 2cm) = 8 cm³ .

The density of the cube is

(the mass of the cube, in grams) / (8 cm³) grams per cm³ .

That's the best I can do, because you haven't told us the cube's mass.

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What mass of a material with density rho is required to make a hollow spherical shell having inner radius r1 and outer radius r2

Margarita [4]

Answer:

$m=\rho\times \frac{4}{3} \times \pi \times(r_2^3-r_1^3 )$

Explanation:

We have to make a hollow sphere of inner radius $r_1$ and outer radius $r_2$ .

Then the mass of the material required to make such a sphere would be calculated as:

Total volume of the spherical shell:

$V_t=\frac{4}{3} \pi.r_2^3$

And the volume of the hollow space in the sphere:

$V_h=\frac{4}{3} \pi.r_1^3$

Therefore the net volume of material required to make the sphere:

$V=V_t-V_h$

$V=\frac{4}{3} \pi(r_2^3-r_1^3)$

Now let the density of the of the material be $\rho$ .

<u>Then the mass of the material used is:</u>

$m=\rho.V$

$m=\rho\times \frac{4}{3} \times \pi \times(r_2^3-r_1^3 )$

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3 years ago

The temp of the metal in a running car engine is 388 K. Find this temp in Celsius.

Korvikt [17]

Answer:

115°c

Explanation:

°c=k-273

388-273=115

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3 years ago

A guitar string is plucked. What best describes the formation and transmission of the sound wave?

makvit [3.9K]

The string vibrates the surrounding air, which produces a longitudinal wave.

Brainly if correct? Please and thank you :D

6 0

2 years ago

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A man pushes a lawn mower on a level lawn with a force of 250N. If 40% of this force is directed downward, how much work is done

Dvinal [7]

When considering work, we always take the force directed along the axis of motion (in this case, the horizontal axis). If 40% of the force is directed downward, then 60% of the force is being directed horizontally, so the horizontal force is 250*0.6 = 150N. Work = Force * distance = 150N * 6.2m = 930J

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3 years ago

Supersonic aircraft produce a loud noise called a sonic boom. Look at the waves hitting the observer. Based on what you see, wha

Masteriza [31]

Answer:

Sonic boom is an impulsive noise similar to thunder. It is caused by an object moving faster than sound -- about 750 miles per hour at sea level. An aircraft traveling through the atmosphere continuously produces air-pressure waves similar to the water waves caused by a ship's bow.

Explanation:

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2 years ago