The Sun is actually more luminous at sunspot minimum than at maximum
Indicate whether the statement is true or false
FALSE
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The design of a part that operates at temperatures up to 150°C (302°F) requires a material that is of low density and corrosion resistant. The stresses on the part are up to 50 MPa (7250psi), and it is required to be able to recycle the material. Which of the following materials might be appropriate?
(a) PE (b) A magnesium alloy (c) Epoxy (d) PEEK
Giant and supergiant stars are rare because that stage of stellar evolution is short
Indicate whether the statement is true or false
A Type II supernova produces a planetary nebula
Indicate whether the statement is true or false
A parallel-plate capacitor has plates of area 0.40 m2 and plate separation of 0.20 mm. The capacitor is connected across a 9.0-V potential source. (?0 = 8.85 × 10-12 C2/N • m2)
(a) What is the magnitude of the electric field between the plates? (b) What is the capacitance of the capacitor? (c) What is the magnitude of the charge on each plate of the capacitor?