Are sand dunes stationary or do they move and migrate?
What will be an ideal response?
Answer: Sand dunes migrate. The whole mound of sand moves downwind as sand grains on the windward slope move up and over the crest of the dune to fall on the leeward slope. Sand removed from the back of the dune is redeposited on the front of the dune. Over time, this continuous process moves the entire dune.
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Estimation: Estimate how many pennies would you have to stack to reach from the floor to an average 8-ft ceiling.
A. 2 × 103 B. 2 × 102 C. 2 × 104 D. 2 × 105 E. 2 × 106
Which of the following observations does NOT inform astronomers about how the Solar System must have formed.
A. The Solar System is flat in structure. B. All known ages for Solar System bodies are 4.6 billion years or younger. C. The farther out planets take longer to complete an orbit about the Sun. D. The inner four planets are small and rocky, while the outer four planets are large and gaseous.
The square plates of a 3000-pF parallel-plate capacitor measure 40 mm by 40 mm and are separated by a dielectric that is 0.29 mm thick and completely fills the region between the plates
What is the dielectric constant of the dielectric? (?0 = 8.85 × 10-12 C2/N ? m2) A) 61 B) 56 C) 50 D) 45 E) 67
The phase angle of an LRC series circuit with an inductive reactance of 200 ? and a capacitive reactance of 100 ? is 40.0°. What is the value of the resistor in this circuit?
A) 200 ? B) 119 ? C) 265 ? D) 156 ? E) 100 ?