Dipole moment are used to calculate the
2 answers:
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Answer:
b. 1 770 kWh
Explanation:
The heat needed to change the temperature of a certain amount of a substance is given by:
Here m is the mass of the susbtance, C is the specific heat of the substance and is the temperature change
Recall that one watt hour is equivalent to 1 watt (1 W) of power sustained for 1 hour. One watt is equal to 1 J/s. So, one watt hour is equal to 3600 J and one kilowatt hour is equal to
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