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3 years ago

What is a true statement about the rotation period of the moon?

1 answer:

5 0

The time it takes for the Moon to rotate once around its axis is equal to the time it takes for the Moon to orbit once around Earth

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A cylindrical storage tank has a radius of 1.35 m. When filled to a height of 3.45 m, it holds 14,014 kg of a liquid industrial

Kruka [31]

Answer:

709.93 kg/m³

Explanation:

Density: This can be defined as the ratio of the mass of a body to the volume of that body. The S.I unit of density is kg/m³

From the question above,

D = m/v.............................. Equation 1

Where D = density, m = mass, v = volume.

Note: The volume of the liquid is equal to the volume of the height occupied by the liquid in the container

Since the tank is cylindrical,

v = πr²h........................ Equation 2

Where r = radius of the the tank, h = height of the liquid in the tank

Substitute equation 2 into equation 1

D = m/(πr²h)............... Equation 3

Given: m = 14014 kg, r = 1.35 m, h = 3.45 m, π = 3.14

Substitute into equation 3

D = 14014/(3.14×1.35²×3.45)

D = 14014/19.74

D = 709.93 kg/m³

6 0

3 years ago

What wave is a wave in which the vibration of the medium is parallel to the direction the wave travels.?

galina1969 [7]

The answer to this question would be a transverse wave, because the vibration travels parallel to the direction that the wave is traveling.

7 0

3 years ago

You are hungry and decide to go to your favorite neighborhood fast-food restaurant. You leave your apartment and take the elevat

Viktor [21]

Answer:

A) R = (200 i ^ + 100 j ^ + 30k ^) m , B) L = 223.61 m , C) R = 225.61 m

Explanation:

Part A

This is a vector summing exercise, let's take a Reference System where the z axis corresponds to the height (flights), the x axis is the East - West and the y axis corresponds to the North - South.

Let's write the displacements

Descending from the apartment

10 flights of 3 m each, the total descent is 30 m

Z = 30 k ^ m

Offset at street level

L1 = 0.2 i ^ km

L2 = 0.1 j ^ km

Let's reduce everything to the SI system

L1 = 0.2 * 1000 = 200 i ^ m

L2 = 100 j ^ m

The distance traveled is

R = (200 i ^ + 100 j ^ + 30k ^) m

Part B

The horizontal distance traveled can be found with the Pythagorean theorem for the coordinates in the plane

L² = x² + y²

L = √ (200² + 100²)

L = 223.61 m

Part C

The magnitude of travel, let's use the Pythagorean theorem for the sum

R² = x² + y² + z²

R = √ (30² + 200² + 100²)

R = 225.61 m

7 0

3 years ago

A proton at location A makes an electricfield E-->1 atlocation B. A different proton, placed atlocation B, experiences a forc

luda_lava [24]

Answer:

Explanation:

|F-->1| = E-->1 x charge on proton

= 300 x 1.6 x 10⁻¹⁹

Magnitude of electric force on proton

|F-->1| = 480 x 10⁻¹⁹ N .

Inside lithium nucleus , there are three protons so charge on it

= 3 x 1.6 x 10⁻¹⁹ = 4.8 x 10⁻¹⁹ C .

Magnitude of electric force on lithium nucleus

|F-->Li| = E-->1 x charge on lithium nucleus

= 300 x 4.8 x 10⁻¹⁹

= 1440 x 10⁻¹⁹ N .

Electron has same charge as that possessed by proton so charge on electron = 1.6 x 10⁻¹⁹ C

Magnitude of force on electron

|F-->1| = E-->1 x charge on electron

= 300 x 1.6 x 10⁻¹⁹

= 480 x 10⁻¹⁹ N .

7 0

3 years ago

The dimensions of aluminum foil in a box for sale in super markets are 66 2/3 yards by 12 inches. the mass of the foil is 0.83 k

disa [49]

Length of the sheet is given as

$L = \frac{200}{3} yards = 6096 cm$

width of the sheet is given as

$w = 12 inches = 30.48 cm$

now let say its thickness is "t"

so the volume of the sheet is given as

$V = L*w*t$

$V = 6096*30.48* t$

$V = 185806.08*t cm^3$

mass of the sheet is given as

$m = 0.83 kg = 830 gram$

now we have

$density = \frac{mass}{volume}$

$2.70 = \frac{830}{185806.08*t}$

by solving above we have

$t = 1.65 * 10^{-3} cm$

so the thickness of sheet will be above

4 0

3 years ago