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ss7ja [257]
3 years ago
7

A two-lane highway is 8 meters wide and the asphalt is typically 4cm thick. What would the volume of the asphalt be for a road t

hat is 20km long? Express your answer in cubic meters.​
Physics
1 answer:
Radda [10]3 years ago
8 0

Answer:

The volume of the highway's asphalt will be 6,400 cubic meters.

Explanation:

Volume is the overall magnitude of the three dimensions of a given object, that is, its width, length and depth. Thus, to obtain the volume of a certain object, its width must be multiplied by its length and this result in turn by its depth: W x L x D.

Thus, in this case, the highway has a width of 8 meters, a height of 4 cm and a depth of 20 km. As a first measure, all units of measurement must be expressed in a uniform way, for which the meter will be used in this case. Thus, the width of the highway will not vary, while its height will go from 4 cm to 0.04 meters (4/100), and its length will go from 20 km to 20,000 meters (20 x 1,000).

So, to obtain the volume of the asphalt on this highway, the following calculation must be performed:

8 x 0.04 x 20,000 = Volume

6,400 = Volume

Thus, the volume of the highway's asphalt will be 6,400 cubic meters.

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a) Constant

b) Constant

Explanation:

a)

We can answer this question by using the equivalent of Newton's second law of motion of rotational motion, which can be written as:

\tau_{net} = I \alpha (1)

where

\tau_{net} is the net torque acting on the object in rotation

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So we can rewrite eq.(1) as

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In this problem, we are told that at a given instant, the object has an angular acceleration due to the presence of torques, so there is a non-zero change in angular velocity.

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\tau_{net}=0

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b)

In this second case instead, all the torques are suddenly removed.

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Therefore, this means that

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