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xz_007 [3.2K]
3 years ago
12

A car travels 45 km due north and 70 km west. What is the car's displacement?

Physics
1 answer:
Elis [28]3 years ago
7 0

Answer:

A

Explanation:

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Grains of fine california beach sand are approximately spheres with an average radius of 50 μm and are made of silicon dioxide,
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The average radius(r) of each grain is r = 50 nanometers = 50*10^-6 meters

Since it is spherical, so

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V= (4/3)*pi*(50*10^-6)^3

V=5.23599*10^-13 m^3

 

We are given the Density(ρ) =2600kg/m^3

 

We know that:

Density(p) = mass(m)/volume(V)

m = ρV

 

So the mass of a single grain is:

m = 5.23599*10^-13 * 2600 = 1.361357*10^-9 kg

 

 

The surface area of a grain is:

a = 4*pi*r^2

a = 4*pi*(50*10^-6)^2

a = 3.14*10^-8 m^2

 

 

Since we know the surface area and mass of a grain, the conversion factor is:

1.361357*10^-9 kg / 3.14*10^-8 m^2

 

Find the Surface area of the cube:

cube = 6a^2

cube = 6*1.1^2  = 7.26m^2

 

multiply this by the converions ratio to get:

total mass of sand grains = (7.26 m^2 * 1.361357*10^-9 kg) / (3.14*10^-8 m^2)

total mass of sand grains = 0.3148 kg = 314.80 g

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Sulfur and nitrogen oxide release into the atmosphere is most responsible for ozone depletion acid precipitation global warming
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The answer is acid precipitation 

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Complete each statement with the word that makes it true.
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From the geometry of the problem, the 20 m-long cable creates the hypotenuse of a right triangle, with the extended of the other two sides of size 20 m * cos(30 deg), which is around 17.3 m. Therefore, the ball has increased by 20 m - 17.3 m = 2.7 m. 

The potential energy will have altered by m*g*h, which is 1400 kg * 9.8 m/s^2 * 1.6 m , or about 37044 joules.

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3 years ago
Read 2 more answers
Pls help :3 ♥️ I rly need this turned in
Lerok [7]

Answer:

It does, it takes 50ml

Explanation:

5 0
3 years ago
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