It takes ________ years for the sun to progress through one sunspot cycle, wherein sunspots appear at high latitudes, shift to lower and lower latitude, then return to high latitudes. Refer to the graph above
A) about 10 years
B) about 110 years
C) about 1 year
D) This figure cannot be used to answer this question.
A
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Which of the following statements is true in the context of radioactive elements?
A) The abundances of the daughter isotopes of radioactive elements in a rock gradually decrease. B) The abundance of a radioactive element in a rock gradually decreases. C) Uranium-238 has the longest half-life among all the other radioactive substances. D) Potassium-40 has the longest half-life among all the other radioactive substances.
A(n) _______________ is an object that orbits the Sun and is spherical, but not large enough to have the gravitational influence to clear away remaining objects orbiting nearby
Fill in the blank(s) with correct word
Two-Source Interference of Sound: Two loudspeakers placed 6.00 m apart are driven in phase by an audio oscillator having a frequency range from 1908 Hz to 2471 Hz. A point P is located 4.70 m from one loudspeaker and 3.60 m from the other speaker. At what frequency of the oscillator does the sound reaching point P interfere constructively? The speed of sound is 344 m/s.
A. 2190 Hz B. 2420 Hz C. 2110 Hz D. 2340 Hz E. 2270 Hz
A jumbo jet has a mass of 100,000 kg. The thrust for each of its four engines is 50,000 N. What is the jet's acceleration when taking off?
A) 0.25 m/s2 B) 1 m/s2 C) 2 m/s2 D) 4 m/s2 E) none of the above