Auniform gaseous nebula has an average surface brightness of 17.77 magnitudes per second of arc: (a) if a nebula has an angular area of 144 square arcsec, what is the total apparent magnitude? (b) if a nebula were moved to twice its original distance, what would happen to its angular area, total apparent magnitude, and surface brightness?

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

Which situation will produce the greatest change of momentum

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?