Are sunspots really dark and cool?

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No, they are about 4,000 K, orange in color, but still cooler and darker than the bright yellow photosphere that surrounds them.

Physics & Space Science

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Two equal point charges are separated by a distance d. When the separation is reduced to d/4, what happens to the force between the charges?

A. it decreases by a factor of 4 B. it increases by a factor of 4 C. it increases by a factor of 8 D. it increases by a factor of 16 E. it increases by a factor of more than 16

Physics & Space Science

An astronaut in a space suit is motionless in outer space. The propulsion unit strapped to her back ejects some gas with a velocity of 40.0 m/s. The astronaut recoils with a velocity of 1.00 m/s. If the mass of the astronaut and space suit after the gas is ejected is 100 kg and the mass of the gas ejected is 2.50 kg, then the total kinetic energy after the ejection of the gas is

A. 2,050 J. B. 3,430 J. C. 4,150 J. D. 5,070 J. E. 6,320 J.

Physics & Space Science

What was there just after the Big Bang?

A) nothing B) the primeval fireball C) a singularity D) a black hole E) everything was inside Earth

Physics & Space Science

Starting from rest, a proton falls through a potential difference of 1.2 kV. What speed does it acquire?

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Physics & Space Science