What are close-toed shoes least likely to provide protection against?
2 answers:
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Answer:
the normal stress induced by the concrete post
the normal stress induced by the steel
Explanation:
Given that:
Modulus for elasticity for concrete post =
psi
Thermal coefficient for concrete post =
Modulus for elasticity of steel bar =
Thermal coefficient of steel bar =
Change in temperature ΔT = 80°F
Diameter of the steel rood = 7/8-in
Area of the steel rod =
=
= 3.61 in²
Area of concrete parts = (10)(10) -
= (100 - 3.61) in²
= 96.39 in²
The total strain developed in the concrete post can be expressed as:
=
=
=
=
P = 6482.98 lb
Since, the normal stress in concrete is induced as a result of temperature rise; we have the expression :
Thus, the normal stress induced by the concrete post
Also; the normal stress in the steel bars induced as a result of temperature rise is as follows:
Thus, the normal stress induced by the steel
Answer:
The gplanet is 0.193 m/s^2
Explanation:
The speed of the pulse is:
where
m=mass of the wire=4 g= 4x10^-3 kg
M=mass of the object= 3 kg
Replacing values:
Answer:
7500 m
Explanation:
The radar emits an electromagnetic wave that travels towards the object and then it is reflected back to the radar.
We can call L the distance between the radar and the object; this means that the electromagnetic wave travels twice this distance, so
d = 2L
In a time of
Electromagnetic waves travel in a vacuum at the speed of light, which is equal to
Since the electromagnetic wave travels with constant speed, we can use the equation for uniform motion ,so:
(1)
where
, where L is the distance between the radar and the object
Re-arranging eq(1) and substituting, we find L: