Answer:
The metal Harvey should use for reflective coatings in telescope mirror is;
C. Aluminum
Explanation:
In a telescope, the mirror of the telescope is usually made of a temperature-resistant and strong glass, while the reflective coating of the mirrors is made usually from aluminum. A protective coating often composed of silicon dioxide is placed n the top of the reflective coating
Aluminum is used in a telescope, rather than the silver, which is the most reflective material, because silver requires special conditions to be able to work, and silver tarnishes when exposed to air containing sulfur, and silver is susceptible to corrode.
I’ll link the tutorial of how to do a chair in onshape in the comments
Answer:
10 ft or 3.048 m (for unqualified person)
1.09 ft or 0.33 m (for qualified person)
Explanation:
OSHA has prescribed "Minimum Approach Distance - MAD" to ensure safety of personnel working with electrical power lines.
For a unqualified person:
The minimum approach distance is 10 ft or 3.048 m
For a qualified person:
For a voltage in the range of 300V to 750V (Phase to Ground or Phase to Phase) the minimum approach distance is 1.09 ft or 0.33 m
Since 600V lies in the above range hence it is applicable on 600V.
OSHA has developed a full list of minimum approach distance according to the level of voltages (50V to 72000V)
Answer:
Head loss in 100 m length equals 1.00 m.
Explanation:
The head loss in an open channel is calculated using manning's equation as follows
For a asphalt rectangular channel we have
Area of flow = 
Wetted Perimeter = 
manning's roughness coefficient = 0.016
Applying values in the above equation we get
Now we know that
Answer:
a. the desired signal is 90 degrees out of phase with the intelligence signal.
Explanation:
The signal to noise ratio of FM detector is defined as function of modulation index for SSB FM signal plus narrow band Gaussian noise at input. The ratio is usually higher than 1:1 which indicates more signals than noise.
