Why do white-dwarf supernovae all have the same maximum luminosity?
What will be an ideal response?
White-dwarf supernovae occur when the mass of the white dwarf has just exceeded 1.4 MSun. Since the mass is always the same and the entire object-made of degenerate matter-explodes at once, the maximum luminosity is the same.
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A 777 aircraft has a mass of 300,000 kg. At a certain instant during its landing, its speed is 27.0 m/s. If the braking force is 435,000 N, how much further does it travel along the runway before it comes to a stop?
A) 40.5 m B) 142 m C) 181 m D) 251 m E) 456 m
What effect or effects would be most significant if the Moon's orbital plane were exactly the same as the ecliptic plane?
A) Solar eclipses would be much rarer. B) Solar eclipses would be much more frequent. C) Total solar eclipses would last much longer. D) both A and C E) both B and C
The initial speed of a cannon ball is 0.20 km/s. If the ball is to strike a target that is at a horizontal distance of 3.0 km from the cannon, what is the minimum time of flight for the ball?
a. 16 s b. 21 s c. 24 s d. 14 s e. 19 s
What would happen if both pins in Procedure 1 were located at the same point, that is, right next to each other actually touching? (Try it if you need to, so that you can see what the result would be.)