Cooler stars (about 3000 K) emit most of their radiation at wavelengths shorter than 600 nm.
Answer the following statement true (T) or false (F)
False
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Each choice below describes how a few astronomical phenomena are related to time periods. Which list is entirely correct? (Careful: some lists are partially correct.)
A) Earth's rotation defines a day. The saros cycle of eclipses defines a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years. B) Earth's rotation defines a day. The cycle of the Moon's phases takes about a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years. C) Earth's rotation defines a day. The cycle of the Moon's phases takes about a week. Earth's orbit defines a year. Earth's cycle of axis precession defines a month. D) Earth's rotation defines a day. The Sun's rotation defines a week. The Moon's rotation defines a month. Earth's orbit defines a year.
Suppose that we wish to find the "net force" on an automobile, in order to apply Newton's law of motion to the motion of the automobile
As part of the net force, do we need to include "internal frictional forces" due to internal gears, bearings, etc.? A) Yes, because of Newton's law of force pairs. B) No, because only external forces need to be included. C) Yes, because every internal and external force must be included. D) No, because only the drive force needs to be included. E) Yes, because these forces dissipate some of the car's energy.
An object of mass m rests on a flat table. The earth pulls on this object, exerting a force of magnitude mg. What is the Newton's third law pair force to this pull?
A) The table pushing up on the object exerting the force mg. B) The object pushing down on the table exerting the force mg. C) The table pushing down on the floor exerting the force mg. D) The object pulling upward on the Earth exerting the force mg. E) The table pulling upward on the Earth exerting the force mg.
Which of the following four objects has different kinetic energy?
a. An object of mass m moving with speed 4v b. An object of mass 4m moving with speed 2v c. An object of mass 16m moving with speed v d. An object of mass 2m moving with speed 3v e. None of these; all four objects have the same kinetic energy.