Answer:
(a) Stiffness is measured by Young modulus
(b) Strength is measured as tensile stress in force per unit area
(c) Ductility is measured by elongation and reduction of area.
(d) Toughness is measured by the amount of energy that a unit volume of the material has absorbed after being stressed up to the point of fracture.
(e) Hardness is obtained by measuring the size of the impression left by an indenter
Explanation:
Mechanical properties are helpful in determining whether or not a material can be produced in the desired shape and also resist the mechanical forces anticipated.
Given mechanical properties of metals and how they are measured is as follows:
(a) Stiffness is the ability of a material to resist deformation under stress. It is measured by Young modulus
(b) Strength is the ability of a material to resist the externally applied forces without breaking or yielding. It is measured as tensile stress in force per unit area
(c) Ductility is the property of a material enabling it to be drawn into a wire with the application of a tensile force. It is measured by elongation and reduction of area.
(d) Toughness is the property of a material to resist fracture due to high impact. It is measured by the amount of energy that a unit volume of the material has absorbed after being stressed up to the point of fracture.
(e) Hardness is the property of a metal, which gives it the ability to resist being permanently deformed, when a load is applied. It is obtained by measuring the size of the impression left by an indenter
Answer:
9.22 m/s
Explanation:
Vertical height, y = 36 m
Horizontal distance, d = 25 m
Let the initial velocity of projection is u and it is projected horizontally.
Let t be the time taken by the ball to hit the ground.
For horizontal motion
horizontal distance = horizontal velocity x time
d = u x t
25 = u x t .... (1)
Use second equation of motion for vertical direction
y = 0.5 x g t², as the initial vertical velocity is zero.
36 = 0.5 x 9.8 x t²
t = 2.7 second
Put in equation (1)
25 = u x 2.7
u = 9.22 m/s
Thus, the initial velocity with which the ball is projected horizontally is 9.22 m/s.
Answer:
Small, made of rocks, made of few moons.
Explanation:
The inner planets are also called the terrestrial planets and are mostly rock. These planets are Mercury, Venus, Earth and Mars.
They are made of dense balls of rocks with a few moons. They are believed to have been formed from denser rocky materials that accreted first during the early formation of the solar system.
Outside the terrestrial planets are the gas giants which are mostly made of large masses of gas. The Asteroid belt separates the inner and outer planet from each other.
Answer:
<h3>وذلك بسبب اختلاف نصف القطر من مكان لاخر, حيث ان التعجيل الارضي يعتمد على نصف القطر للكوكب بشكل اساسي.</h3>
Explanation:
A birds eye view of a collision i believe means an elevated view of two (or more) objects crashing into each other.
