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2 years ago

Which of these is considered a contact force?

Physics

1 answer:

nexus9112 [7]2 years ago

5 0

Answer:

C -) The friction between an object and air.

Explanation:

The frictional force is the force that exists between two surfaces in contact, which is opposed to the movement.

That is, this type of force exists as long as there is physical contact between surfaces.

While the other types of force always act at a separation distance between bodies.

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What is the definition of physical change

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3 years ago

In a nuclear station if the temperature of the superheated water starts to decrease what should the engineer in charge of the re

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Explanation:

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2 years ago

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3 years ago

What is the frequency of a wave that has a speed of 0.4 m/s and a wavelength of 0.020 meters?

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3 years ago

A railroad track and a road cross at right angle. An observer stands on the road 70 meters south of the crossing and watches an

fgiga [73]

Answer:

The train is moving with a speed of 57.6 m/s.

Explanation:

Given that,

Distance of observer from the road, d = 40 m (due south)

Velocity of the train, v = 60 m/s (due east)

So,

$x(t)=70\\\\y(t)=60t$

t is time

Net displacement is given by :

$z(t)=\sqrt{(60t)^2+(70)^2}$

Differentiating above equation wrt t as :

$z'(t)=\dfrac{1}{2}(3600t^2+4900)^{-1/2}{\cdot} 7200t$

Put t = 4 s

$z'(4)=\dfrac{1}{2}(3600(4)^2+4900)^{-1/2}{\cdot} 7200(4)\\\\z'(4)=57.6\ m$

So, the train is moving with a speed of 57.6 m/s.

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3 years ago