Answer:
D Reflection
Explanation:
It reflects the light from the sun. Then when the earth gets in the way, it casts a shadow causing crescent moons.
Answer:
(C) 29°
Explanation:
ACME THREAD ANGLE : it is the angle measured between the thread axis and thread the thread flanks, with the help of thread angle we calculate the shape of screw thread it is the mean of v thread and square thread the acme thread angle is denoted by β every thread has its own charactersistics which depends on the pitch and diameter of the thread
Answer:
Refrigerant R-134a is to be cooled by waterin a condenser.The refrigerant enters thecondenser with a mass flow rate of 6 kg/minat 1 MPa and 70 C and exits at 35 C. The cool-ing water enters at 300 kPa and 15 C andleaves at 25 C. Neglecting pressure drops,determine a) the required mass flow rate ofthe cooling water, and b) the heat transferrate from the refrigerant to the water.SolutionFirst consider the condenser as the control volume. The process is steady,adiabatic and no work is done. Thus over any time intervalΔt,ΔEΔt=0and thusXin˙E=Xout˙Ewhere˙E=˙m h+12V2+gz650:351 Thermodynamics·Prof. Doyle Knight37
Background image
I only know this
sorry for errors
Answer:
a) 
, b) 
Explanation:
The Brinell hardness can be determined by using this expression:
Where 
and 
are the indenter diameter and the indentation diameter, respectively.
a) The Brinell hardness is:
![HB = \frac{2\cdot (1000\,kgf)}{\pi\cdot (10\,mm)^{2}} \cdot \left[\frac{1}{1-\sqrt{1-\frac{(2.50\,mm)^{2}}{(10\,mm)^{2}} } } \right]](https://tex.z-dn.net/?f=HB%20%3D%20%5Cfrac%7B2%5Ccdot%20%281000%5C%2Ckgf%29%7D%7B%5Cpi%5Ccdot%20%2810%5C%2Cmm%29%5E%7B2%7D%7D%20%5Ccdot%20%5Cleft%5B%5Cfrac%7B1%7D%7B1-%5Csqrt%7B1-%5Cfrac%7B%282.50%5C%2Cmm%29%5E%7B2%7D%7D%7B%2810%5C%2Cmm%29%5E%7B2%7D%7D%20%7D%20%7D%20%20%5Cright%5D)
b) The diameter of the indentation is obtained by clearing the corresponding variable in the Brinell formula:
![d = (10\,mm)\cdot\sqrt{1-\left[1-\frac{2\cdot (500\,kgf)}{\pi\cdot (300)\cdot (10\,mm)^{2}} \right]^{2}}](https://tex.z-dn.net/?f=d%20%3D%20%2810%5C%2Cmm%29%5Ccdot%5Csqrt%7B1-%5Cleft%5B1-%5Cfrac%7B2%5Ccdot%20%28500%5C%2Ckgf%29%7D%7B%5Cpi%5Ccdot%20%28300%29%5Ccdot%20%2810%5C%2Cmm%29%5E%7B2%7D%7D%20%20%5Cright%5D%5E%7B2%7D%7D)
Answer: They showed that many people worked on the project and demonstrate how hard they worked.
Explanation:
