uniform electric field exists between two parallel plates separated by 2.0 cm. The intensity of the field is 15 kN/C. What is th
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Answer:
It is not possible to produce continued and oriented fiber.
Explanation:
To solve the problem it is necessary to take into account the concepts related to Fiber volume ratio. The amount of fiber in a fiber reinforced compound corresponds directly to the mechanical properties of the compound. Given the fiber volume fraction, the theoretical elastic properties of a compound can be determined. The elastic modulus of a compound in the fiber direction of a unidirectional compound can be calculated using the following equation:
Where,
E is the longitudinal modulus of Elasticity
is the fiber volume ratio
is the elastic modulus of the matrix
is the elastic modulus of the fibers
We need to consult the table of characteristics of Fibers and Reinforcements of Materials, in which they specify that the modulus of elasticity of the aramid fiber-epoxy is
Moreover from the statement,
Replacing in the previous equation,
To make the comparison we now calculate the Fiber volume ratio through the transverse elastic modulus,
Our values are given in this case as:
Replacing,
From both cases it is possible to conclude that it is not possible to produce a fiber of the specified material in a continuous and oriented manner, as long as the volume fraction is different in the different cases.
False: when reporting speed, only value and units are needed, not the direction
Explanation:
Let's start by reminding the difference between speed and velocity:
- Speed is a scalar quantity which tells "how fast" an object is moving, regardless of its direction of motion.
It can be calculated as: follows:
where :
d is the distance travelled
t is the time interval
Therefore, speed has no direction, so it is written only as a value followed by units: for example, 5 m/s.
- Velocity is a vector quantity given by:
where :
d is the displacement of the object (which is a vector connecting the initial position to the final position of motion)
t is the time interval
Since it is a vector, velocity has both magnitude and direction, therefore it also takes into account the direction of motion of the object. An example of velocity is 5 m/s east, where the direction is also specificied.
Learn more about speed and velocity:
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Answer:
The tension in the string is quadrupled i.e. increased by a factor of 4.
Explanation:
The tension in the string is the centripetal force. This force is given by
m is the mass, v is the velocity and r is the radius.
It follows that , provided m and r are constant.
When v is doubled, the new force, , is
Hence, the tension in the string is quadrupled.