What two pieces of information are needed to determine the diameter of a faraway object? Explain how that information is used to determine the diameter
What will be an ideal response?
The distance and the angular diameter are needed. The diameter can be calculated by using the small-angle formula: angular diameter (in arc seconds)/2.06×10^5 = linear diameter/distance.
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A stepped steel shaft with diameters d1 5 56 mm and d2 5 52 mm is twisted by torques T1 5 3.5 kN?m and T2 5 1.5 kN?m acting in opposite directions. The maximum shear stress is approximately:
(A) 54 MPa
(B) 58 MPa
(C) 62 MPa
(D) 79 MPa
If the distance between two objects doubles, the gravitational attraction between them becomes half.
Answer the following statement true (T) or false (F)
Suppose we imagine the Sun to be about the size of a grapefruit. How far away are the nearest stars (the three stars of Alpha Centauri)?
A) the length of a football field (100 meters) B) across town C) across the state D) across the United States E) 25,000 miles
What is the angular separation of two spectral lines of wavelengths 497 nm and 251 nm formed in the third order with a diffracting grating having 587 lines per millimeter?
A) 34.8° B) 24.8° C) 41.3° D) 29.4° E) 4.21°