The design of a part that operates at room temperature requires a material that is of low density, corrosion resistant, and low cost. The stresses on the part are very low. Which of the following materials might be appropriate?
(a) PE
(b) A magnesium alloy
(c) Alumina ceramic
(d) PEEK
(a) PE
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Which moon of Saturn constantly changes its rotational speed and rotational axis?
A) Mimas B) Iapetus C) Hyperion D) Calypso E) Janus
A metal airplane flies horizontally at 200. m/s where the Earth's magnetic field is vertical and is 45.0 ?T. If the wingspan is 25.0 meters:
(a) what emf is induced across the wings? (b) what wingspan would produce 1.0 volt emf? (c) The plane reverses direction. Does the polarity of the wingtip emf change, i.e., if the left wing was positive, does it now become negative?
The proton storms in the solar wind travel at almost the speed of light
Indicate whether the statement is true or false
Two different gases may have the same emission line spectrum
Indicate whether the statement is true or false