Why does Venus appear so bright to the eye?
A) It gets closer to us than any other planet does.
B) Venus is closer to the Sun, so gets more intense sunlight.
C) The planet's cloud-cover is highly reflective, reflecting 60% of the Sun's light.
D) As seen from Earth, the disk of Venus can appear larger than any other planet's.
E) All of the above are correct.
E
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When evaporation occurs in a dish of water, the molecules remaining in the water
A) are less energetic. B) have decreased average speeds. C) are at a lower temperature. D) all of the above
The instruction manual for a hot-wire anemometer states that ‘roughly speaking, the current varies as the one-fourth power of the average velocity at a fixed wire resistance’. Check this statement, using the heat transfer characteristics of thin wire in air and water.
GIVEN • A thin current carrying wire in an air or water stream FIND • Show that the current (I) varies as the one-fourth power of the fluid velocity (V?) at a fixed resistance (ReI) ASSUMPTIONS • Radiative heat transfer is negligible
The magnetic domains in a non-magnetized piece of iron are characterized by which orientation?
a. parallel to the magnetic axis b. anti-parallel (opposite direction) to the magnetic axis c. random d. perpendicular to the magnetic axis
Which of the following terms describe lenses that are thinner at the center than at the edges? (There could be more than one correct choice.)
A) convex lenses B) diverging lenses C) converging lenses D) concave lenses