What causes friction between two seemingly smooth surfaces is that surfaces that are too smooth tend to stick together.

Friction is resistance to movement or flow.

When two surfaces are smooth, their atoms and molecules come into contact. this allows for the interaction between the surfaces of the two materials. chemical interactions leads to substances adhering together using cohesive forces. this in turn restricts motion.

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Air is composed of many gases, while water is composed of a pure substance. Which best compares air and water?
natta225 <31>

historicsweetsballroom.com: c

Explanation:

C Air is a compound of two or more components that keep their own identifying properties, while water is composed of mixtures that combine to form a compound.

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4 0
2 months ago

What would be the final velocity for an airplane that starts at the beginning of a 4km runway with an initial velocity of 60 km/
sertanlavr <38>

historicsweetsballroom.com:

2.12×10^-2hour

Explanation:

Acceleration is defined as the change in velocity of a body with respect to time.

Using one of the equations of motion:

S = ut + 1/2at²

Where S is the distance traveled by the airplane

u is the initial velocity

a is its acceleration

t is the time of travel

Given a = 1.2×104 km/h²

u = 60km/hr

t= ?

S = 4km

Substituting the values given into the formula to get "t"

4 = 60t+1/2(1.2×10⁴)t²

4 = 60t+0.6×10⁴t²

0.6×10⁴t²+60t-4= 0

t = -b±√b²-4ac/2a

Where a= 6000 b = 60 c = -4

t = -60±√60²-4(6000)(-4)/2(6000)

t = -60±√3600+96000/12000

t = -60±√99600/12000

t = -60±315.6/12000

t = -60+315.6/12000

t= 255.6/12000

t = 0.0212hour

t = 2.12×10^-2hour

6 0
11 months ago

If an object has 100 J of PE, how much work can it do (with that PE)?
Stella <2.4K>

historicsweetsballroom.com:

W = 100 J

Explanation:

The potential energy of an object is given by : It is said to possessed by an object due to its position under the action of gravity.

The work done by an object is given by :

W = F×d , F is force and d is displacement

We know that, F = mg

So, if an object has 100 J of PE, it means that it can do the work of 100 J.

4 0
6 months ago

A child does 350 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tre
777dan777 <17>

historicsweetsballroom.com:

8.929kg

Explanation:

The work done to place the box at tree house=350 J.

See more: “ On Going Home Joan Didion Summary, Analysis Of On Going Home By Joan Didion

The distance from ground to tree house =4.0 m and  Hence the mass of the box is 8.929kg

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11 months ago

Two plastic balls suspended by strings are placed close to each other. If they have the same charge, how will they interact with
vampirchik <111>
Two plastic balls suspended by strings are placed close to each other. If they have the same charge then they will repel each other.
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