The picture shows several hot-air balloons floating near a river at the Albuquerque International Balloon Fiesta. Everything you see in the picture is made of matter! List at least three different elements or compounds that you observe in the photo, describe a property of each, and compare them to eachother.

Which is not a step in the rock cycle?

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?