If ? is the declination of the star and ? is the latitude of the observer then the hour angle of the star at elongation is given by
Options
A. sin H = tan ? . cot ?
B. cos H = tan ? . cot ?
C. tan H = tan ? . cot ?
D. none of these.
Correct Answer
cos H = tan ? . cot ?
More questions
1. Lami's theroem states that
Options
A. three forces acting at a point are always in equilibrium
B. if three forces acting on a point can be represented in magnitude and direction by the sides of a triangle, the point will be in the state of equilibrium
C. three coplaner forces acting at a point will be in equilibrium, if each force is proportional to the sine of the angle between the other two
D. three coplaner forces acting at a point will be in equilibrium if each force is inversely proportional to the sine of the angle between the other two
Correct Answer: three coplaner forces acting at a point will be in equilibrium, if each force is proportional to the sine of the angle between the other two
2. If d and n are the effective depth and depth of the neutral axis respectively of a singly reinforced beam, the lever arm of the beam, is
Correct Answer: at any point within the cross-section
7. If the coefficients of volume change and compressibility of a soil sample are respectively 6.75 x 10-2 and 3 x 10-2, the void ratio of the soil sample, is