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Ivan
3 years ago
13

An aluminum sheet is compressed to a thickness of 2.0 microns. If each cubic centimeter of aluminum has a mass of 2.70 g, what i

s the mass of an aluminum sheet, in grams, if its total surface area is 5 m2
Physics
1 answer:
Nezavi [6.7K]3 years ago
6 0
We need to find the volume V of the sheet of aluminum that has a thickness t of t=2 micrometers and that is equal to t= 2*10^6 m and area A = 5 m². Volume V is:

V=A*t= 5*2*10^-6 = 1*10^-5 m³. 

Now we need to find the volume V in cm³:

1 m³ = 1 000 000 cm³ so 10^-5 m³ = 10 cm³. 

If 1 cm³ has a mass of 2.70 g then 10 cm³ has a mass of 27.0 grams.

So the correct answer is the mass of the aluminum sheet is m= 27 g or m=0.027 kg. 
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Which of the following quantities provide enough information to calculate the tension in a string of mass per unit length μ that
Bad White [126]

Answer:

A. the wave speed v and Wavelength

Explanation:

Given that

Mass density per unit length=μ

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The velocity V given as

\mu=\dfrac{T}{V^2}\ kg/m

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3 years ago
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Darina [25.2K]

Answer:

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Explanation:

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3 years ago
A 2 kg object with a weight of 20 N is being pulled up by a rope with a tension of 12N what is the acceleration of the object
son4ous [18]

Answer:

The object accelerates downward at 4 m/s² since the tension on the rope is less than weight of the object.

Explanation:

Given;

mass of the object, m = 2 kg

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tension on the rope, T = 12 N

The acceleration of the object is calculated by applying Newton's second law of motion as follows;

T = F + W

T = ma + W

ma = T - W

a = \frac{T-W}{m} \\\\a = \frac{12 - 20}{2} \\\\a = -4 \ m/s^2 (the negative sign indicates deceleration of the object)

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7 0
2 years ago
PLEASE HELP!!!!!!!! More science questions coming soon!!
Naily [24]

Answer:

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4.) A, B and C

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The correct answer is A - 1,2,1,2

2.) Both magnetic force and gravitational force obey inverse square law with distance. They are not directly proportional but inversely proportional to the square distance. B is the correct answer because Both forces can act without objects touching.

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