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Ede4ka [16]
3 years ago
7

The door handles are kept near the door handles​

Physics
1 answer:
Nutka1998 [239]3 years ago
8 0

Answer:

door handles are kept near the door handles that are in the door

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Calculate the number of atoms contained in a cylinder (1 m radiusand1 m deep)of (a) magnesium (b) lead.
Jobisdone [24]

Answer:

The question is incomplete,below is the complete question

"Calculate the number of atoms contained in a cylinder (1μm radius and 1μm deep)of (a) magnesium (b) lead."

Answer:

a. 1.35*10^{11} atoms

b. 1.03*10^{11} atoms

Explanation:

First, we determine the volume of the magnesium in the cylinder container

using the volume of a cylinder

V=\pi r^{2}h\\ r=10^{-6}m\\ h=10^{-6}m\\V=\pi *10^{-6*2}*10^{-6}\\V=\pi *10^{-18}\\V=3.14*10^{-18}m^{3}\\

a. Next we determine the mass of the magnesium ,

using the density=mass/volume

since density of a magnesium

the density of magnesium =1.738*10^{3}kg/m^{3}  \\mass=density * volume \\mass=1.738*10^{3}*3.14*10^{-18}\\mass=5.46*10^{-15}kg\\ \\mass=5.46*10^{-12}g\\

Finally to calculate the number of atoms,

we determine the number of moles

mole=mass/molarmass

mole=5.46*10^{-12}/ 24.305\\mole=0.225*10^{-12}mol\\

Hence the number of atoms is

number of atoms=mole*Avogadro's constant

number of atoms = 0.225*10^{-12}*6.02*10^{23}\\number of atoms =1.35*10^{11} atoms

b. for he lead, we determine the mass of the lead  ,

using the density=mass/volume

since density of a magnesium

the density of lead =11.34*10^{3}kg/m^{3}  \\mass=density * volume \\mass=11.34*10^{3}*3.14*10^{-18}\\mass=35.60*10^{-15}kg\\ \\mass=35.60*10^{-12}g\\

Finally to calculate the number of atoms,

we determine the number of moles

mole=mass/molarmass

mole=35.60*10^{-12}/ 207.2\\mole=0.1718*10^{-12}mol\\

Hence the number of atoms is

number of atoms=mole*Avogadro's constant

number of atoms = 0.1718*10^{-12}*6.02*10^{23}\\number of atoms =1.03*10^{11} atoms

3 0
2 years ago
How does knowledge of the energy content of food help diabetics make smart choices
monitta
The knowledge of the energy content of food can help diabetics make smart diet choices because diabetic patients need the foods that have high carbohydrate and foods with rich fiber content in them. If the diabetic patient is not aware about the energy contents of a food, they can make a wrong choice and ultimately fall ill. Most diabetic patients require foods that have high energy content and low sugar content. Diabetic patients need full care about the food they intake. Taking the right kind of foods rich in protein and carbohydrates can immensely help a diabetic patient control the amount of sugar in the blood.
7 0
3 years ago
13. What's most intriguing about Titan's atmosphere?
sineoko [7]

Answer: There is an unsolved mystery surrounding Titan's atmosphere: Because methane is broken down by sunlight, scientists believe there is another source that replenishes what is lost. One potential source of methane is volcanic activity, but this has yet to be confirmed.

Explanation:

7 0
3 years ago
While moving in, a new homeowner is pushing a box across the floor at a constant velocity. The coefficient of kinetic friction b
Citrus2011 [14]

Answer:

\theta = 66.7 degree

Explanation:

since force is applied downwards at some angle with the horizontal

so here we will have

F_n = mg + Fsin\theta

now we know that the box will not move if applied force is balanced by frictional force on it

so we will have

Fcos\theta = \mu F_n

F cos\theta = \mu (mg + F sin\theta)

F(cos\theta - \mu sin\theta) = \mu mg

F = \frac{\mu mg}{cos\theta - \mu sin\theta}

so here we can say

cos\theta - \mu sin\theta > 0

tan\theta = \frac{1}{\mu}

\theta = tan^{-1}\frac{1}{\mu}

\theta = tan^{-1}(\frac{1}{0.43})

\theta = 66.7 degree

6 0
3 years ago
A force of 1000 newtons was necessary to lift a rock. A total of 3000 joules of work was done. How far was the rock lifted?
CaHeK987 [17]

Answer:

Explanation:

3 meters

4 0
2 years ago
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