An object of the same mass has three different weights at different times . Which statement is possible ?
-The object gains matter and then loses it .
-The object started on earth , was transported to space, and was deposited on the moon .
- The object started at the bottom of a hill and then moved to the top of the hill and then moved back down atop the bottom of the hill .
- the object changed shape, which changes its weight .

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

What three things determine the shape and size of a puddle when water is poured out onto a surface