Answer: 3
Explanation:
Nanotubes are fibers created at the nano scale and can be designed to have special properties of stain resistance.
The length of the arc on a circle of radius, r= 15 inches intercepted by a central angle, θ = 180° is; 47.13 inches
<h3>Length of an arc:</h3>
The length of an arc subtended within a circle is usually a fraction of the circumference of the circle.
In essence, the mathematical formula for evaluating the length of an arc within a circle is;
- Length of an arc = θ/360 × 2πr
- L = (180/360) × 2×3.142 × 15.
Read more on length of an arc;
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In the United States, fire codes are developed primarily by two model code organizations, the International Code Council (ICC) and the National Fire Protection Association (NFPA).
Answer:
55.655 lb/ft³
Explanation:
Given data in question
oil weight i.e. w = 350 lb
oil volume i.e. v = 65 gallons = 6.68403 ft³
To find out
the specific weight of the oil
Solution
We know the specific weight formula is weight / volume
we have given both value so we will put weight and volume value in
specific weight formula i.e.
specific weight = weight / volume
specific weight = 372 / 6.68403 = 55.6550
specific weight = 55.655 lb/ft³
Answer:
ΔU = 53 BTU
Explanation:
In thermodynamics we consider heat entering a system as positive and heat leaving as negative.
Also, work performed by the system is positive and work applied to the system is negative.
The total heat applied to the system is:
Q = 72 - 7 = 65 BTU
The work is:
L = 12 BTU
The first law of thermodynamics states that:
Q = L + ΔU
Where ΔU is the change in internal energy.
Rearranging:
ΔU = Q - L
ΔU = 65 - 12 = 53 BTU