Question:The mechanical properties of cobalt may be improved by incorporating fine particles of tungsten carbide (WC). Given tha
t the moduli of elasticity of these materials are, respectively, 200 GPa and 700 GPa, plot modulus of elasticity vs. the volume percent of WC in Co from 0 to 100 vol% using both upper- and lower-bound expressions to form a performance envelope into which the material will fall. Remember that the isostrain case is the upper-bound case and the isostress is the lower-bound case.Mechanical Properties:Mechanical properties help to identify and classify the materials. The most common Mechanical properties are ductility, tenacity, strength, impact resistance, hardness. The mechanical property does not depend on the quantity of the material.
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Answer:
The time taken for the daredevil to travel the 50 m horizontally is 2.83 s.
Explanation:
Given;
angle of projection, θ = 45°
initial speed of the projectile, u = 25 m/s
horizontal distance traveled by the projectile, x = 50 m
The time taken for the daredevil to travel the 50 m horizontally is calculated as;
where;
is the horizontal component of the velocity = uCosθ
Therefore, the time taken for the daredevil to travel the 50 m horizontally is 2.83 s.
The motion of the stone consists of two separate motions: in air, with average speed 
, and in the water, with average speed 
.
The total distance covered is 127 m, and it is the sum of the distances covered in air and in the water:
(1)
and the total time taken is the sum of the time the stone travels in air + the time the stone travels in the water:
Since
, we can rewrite (1) as
We have now a system of 2 equations with 2 unknown variables:
And if we solve it, we find
Which means that the stone travels for 7 seconds in air and for 5 seconds in the water.
The total distance covered is 127 m, and it is the sum of the distances covered in air and in the water:
and the total time taken is the sum of the time the stone travels in air + the time the stone travels in the water:
Since
We have now a system of 2 equations with 2 unknown variables:
And if we solve it, we find
Which means that the stone travels for 7 seconds in air and for 5 seconds in the water.