What is meant by the phrase "angular size"?
A. the distance around an object
B. an object's diameter
C. the angle between two circular objects
D. how big an object looks, expressed as an angle
Answer: D
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The seasons are caused by the precession of Earth's axis
a. True b. False Indicate whether the statement is true or false
Through what potential must an electron be accelerated to observe maximum diffraction at 70.0° to the surface of a crystal with 0.334 nm between surface planes?
What will be an ideal response?
Three objects are located in the x-y plane as follows: a 6 kg-object is at (0 m, 0 m), a mass of 4 kg is at (3 m, 0 m), and a 2 kg-object is at (0 m, 3 m). Where is the center of mass of the system?
A) (1 m, 2 m) B) (2 m, 1 m) C) (1 m, 1 m) D) (1 m, 0.5 m) E) (0.5 m, 1 m)
A design project requires a TiNi wire to be shaped like the letter S at an operating temperature of 100°C (212°F). The selected TiNi atom arrangement starts to distort at a temperature of 90°C (194°F) and the distortion is finished at a temperature of 60°C (140°F). The wire was drawn straight at a temperature of 500°C (932°F), and the wire supplied is straight. The wire is easily bent into the required S shape at room temperature. What will be the shape of the wire at the operating temperature of 100°C (212°F)?
(a) S shaped (b) C shaped (c) Straight (d) The shape is impossible to know.