In a composite material, the electrical resistivity for current parallel to the axis of the 2nd phase follows the rule of
(a) Mathiessen.
(b) Nordheim.
(c) Mixtures.
(d) Fermi-Dirac.
(c) Mixtures.
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Some narrow rings of Saturn are seen in space probe photos to be caused by
a. gravitational interactions between ring particles. b. a spiral density wave which confines them. c. the magnetic field which holds them in place. d. small shepherd moons that orbit inside and outside the rings
What drives the motion of the tectonic plates on Earth?
A) convection cells in the mantle B) lava flows in trenches along the sea floor C) the Coriolis force D) Earth's magnetic field E) tidal forces
The Sun is gradually increasing in luminosity as it ages. It is about 30% more luminous than it was when it was born. Why isn't this increase considered to be an explanation for global warming?
A) The Sun is increasing in luminosity way too slowly, over many millions of years. B) What the Sun was doing millions of years ago is what determines Earth's temperature, since the Earth doesn't respond directly to what the Sun is doing today. C) The amount of energy the Earth receives from the Sun remains constant regardless of what the Sun does. D) The scientists are covering up this potentially valid explanation.
An airplane flies at 40 m/s at an altitude of 50 m. The pilot drops a heavy package that falls to the ground below. Neglecting air resistance, the package will land
A) beneath the plane. B) 400 m behind the plane. C) 500 m behind the plane. D) more than 500 m behind the plane. E) none of the above