Which classes of stars with large habitable zones probably don't last long enough for life to evolve to use them?
What will be an ideal response?
Classes O through A are all probably too short-lived for life to get technical.
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The ultimate source of energy that powers the Sun is
A) chemical potential energy of hydrogen burning into helium. B) mass energy of hydrogen fusing into helium. C) gravitational potential energy of the contraction of the gas cloud that formed the Sun. D) kinetic energy of the orbital motion of the Sun. E) thermal energy of the hydrogen atoms in the Sun.
A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going upwards
a. the velocity and acceleration both point up b. the velocity points up and the acceleration down c. the velocity points down and the acceleration up d. the velocity and acceleration both point down e. the acceleration is zero
A capacitor is made by taking two sheets of aluminum foil, each 0.022 mm thick and placing between them a sheet of paper which comes from a ream of 580 sheets, the ream being 5.4 cm thick with sheets measuring 216 mm by 279 mm (the usual 8 1/2 by 11). What is the capacitance of the capacitor made this way if the dielectric constant of the paper is 3.7? (?0 = 8.85 × 10^?12 C2/N × m2)
a. 33 nF b. 45 nF c. 21 nF d. 1.4 nF e. 5.7 nF
Faraday's Law states that a voltage is induced in a circuit when there is a changing ________ passing through the circuit.
Fill in the blank(s) with the appropriate word(s).