How is Einstein's famous equation, E= mc2, important in understanding the Sun?
A) It explains the fact that the Sun generates energy to shine by losing some 4 million tons of mass each day.
B) It explains why the Sun's surface temperature is about 6,000°C.
C) It explains why the Sun is so massive.
D) It explains why the Sun has a magnetic field strong enough influence the atmospheres of the planets.
A
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When a metal plate with a hole in it is cooled, the size of the hole becomes
1) smaller, 2) larger, 3) remains the same size, and when the plate is heated, the hole becomes 4) smaller. 5) larger. 6) remains the same size.
The youngest star clusters are ones in which their brightest main-sequence stars have spectral type
A) M. B) B. C) A. D) O. E) G.
Addition by 1. Components: Two forces are acting on an object as shown in the figure. Assume that all the quantities shown are accurate to three significant figures.
(a) What is the magnitude of the resultant force on the object?(b) What is the direction of the resultant force?
What will be an ideal response?
As a proton moves in a direction perpendicular to the electric field lines
A) it is moving from low potential to high potential and gaining electric potential energy. B) it is moving from low potential to high potential and losing electric potential energy. C) it is moving from high potential to low potential and gaining electric potential energy. D) it is moving from high potential to low potential and losing electric potential energy. E) both its electric potential and electric potential energy remain constant.