What is happening to the mass of the Sun over time? Explain
What will be an ideal response?
As 0.007 of the mass of the four protons does not end up as helium, but as energy which will then be radiated out into space, the Sun is indeed losing some mass into space over time.
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Flue gases at 700ºC pass over a bank of superheater tubes at 6 m/s. The tube bank is composed of 20 columns of 2 cm diameter tubes with 40 tubes per column. The arrangement of the tubes is staggered as shown in the figure with ST = SD = 4.0 cm. Determine the pressure drop across the tube bundles, assuming that the tubes have an average surface temperature of 500ºC.
The observation of the moons of Jupiter by Galileo Galilei suggested that:
A) Earth could not move as its moon would be left behind. B) the Solar System was actually geocentric. C) Earth could move and keep its moon. D) the only center of motion was Earth.
A genus is
A) a group of species that are closely related to one another B) a group of species that are particularly intelligent C) a group of organisms that look similar D) groups of organisms that are genetically distinct
Metallic bonding is caused by
A) the sharing of electrons by all atoms. B) the transfer of electrons between atoms. C) unequal charge distributions around neutral molecules. D) atoms bonding to hydrogen molecules. E) atoms bonding to oxygen molecules.