The last quarter moon rises tonight about midnight; when will it rise, and what will its phase be tomorrow night?
What will be an ideal response?
It will rise about an hour later, about 1:00 AM, and be a waning crescent by then.
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The Moon is gravitationally attracted to Earth. Is Earth gravitationally attracted to the Moon?
A. No, the Moon has no gravity. B. Yes, but the force of attraction is less. C. Yes, and the force of attraction is the same. D. Yes, but the force of attraction is greater.
The resistance of a circuit element is a measure of
A. the total energy of the charges in the circuit element. B. the ratio of the voltage difference between element ends to the current in the element. C. the amount of work that an electron can perform. D. the size of the circuit.
A metal wire has a resistance of 31 ? under room temperature conditions of 15°C. When the wire is heated to 81°C the resistance increases by 0.65 ?. What is the temperature coefficient of resistivity of this metal?
a. 3.2E–4 × 10^?4 (°C)?1 b. 2.5E–3 × 10^?3 (°C)?1 c. 1.4E–2 × 10^?3 (°C)?1 d. 3.1E–3 × 10^?3 (°C)?1 e. 1.4E–4 × 10^?4 (°C)?1
When gravitational, magnetic and any forces other than static electric forces are not present, electric field lines in the space surrounding a charge distribution show
a. the directions of the forces that exist in space at all times. b. only the directions in which static charges would accelerate when at points on those lines c. only the directions in which moving charges would accelerate when at points on those lines. d. tangents to the directions in which either static or moving charges would accelerate when passing through points on those lines. e. the paths static or moving charges would take.