If we divide the mass of a star by its volume we calculate the star's ____________________
Fill in the blank(s) with correct word
average density
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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.
In the troposphere segment of the Earth's atmosphere, as you increase in altitude the temperature decreases. This means the speed of sound decreases as you increase in altitude
a. True b. False Indicate whether the statement is true or false
Mercury has only a trace atmosphere because
A. its slow rotation allows atmospheric gases to escape the planet. B. its close proximity to the Sun allows the Sun to gravitationally pull gases directly off the surface of Mercury. C. impacts from planetesimals caused its original atmosphere to evaporate away. D. its smaller size means it has gravitational attraction that is too weak to hold onto an atmosphere.
The condition for rolling without slipping is that the center of mass speed is
A) Vcm= r ?2 B) Vcm = 2 r ? C) Vcm = r ? / 2 D) Vcm = r ? E) Vcm = r2 ?