The number of ______________ appearing on the Sun varies over an 11-year cycle
Fill in the blank(s) with correct word
sunspots
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If the sum of the external forces exerted on an object is zero, then the sum of the external torques exerted on it must also be zero
A) True B) False
A future news release might report that a new planet has been found around a star very similar to our Sun. The system contains other planets as well like our solar system. This newly discovered planet is claimed to have a mass 40 times that of Earth and is located nearly 25 AU from the star it orbits. Which of the following would be a reasonable prediction about this planet, assuming it formed
like our solar system? I. The planet will probably have a mean density of around 5 g/cm3. II. The planet will probably have a radius of around five to ten times greater than Earth's. III. The planet will probably have several satellites. IV. The planet will probably have a composition that is mostly hydrogen and helium. a. I & IV b. I, II, & III c. II, III, & IV d. I, II, & IV e. I, II, III, & IV
How much energy is necessary to place three charges, each of 2.0 ?C, at the corners of an equilateral triangle of side 2.0 cm?
What will be an ideal response?
Electromagnetic waves are generated whenever the ____
a. motion of any particle is changed b. motion of any charged particle changes c. motion of a positively charged particle is changed d. motion of a negatively charged particle is changed e. acceleration of any charged particle is changed