The air in a hot-air balloon at 757 torr is heated from 17.0°c to 36.0°c. assuming that the moles of air and the pressure remain constant, what is the density of the air at each temperature? (the average molar mass of air is 29.0 g/mol.)

Which of the following is the correct order that the planets and stars followed when they formed? Big Bang - - > Planet is formed - - > Star is formed Big Bang - - > Clouds and planets form - - > Star is formed Big Bang - - > Clouds of Dust - - >

1. Which of the following would not be found on the electromagnetic spectrum? A. The wavelengths of electromagnetic radiation B. The frequency of electromagnetic radiation C. The colors of visible light D. The pitch of a sound wave

Calculating heat gained or lost requires mass, specific heat, and A) change in heat B) relative humidity C) change in temp D) rate of temp change

Silver has a resistance of 1.98 x 10^-4 ohms. What voltage would produce a current of 100 amps?

The resistance and the magnitude of the current depend on the path that the current takes. The drawing shows three situations in which the current takes different paths through a piece of material.

You are in a hot air balloon, 350 m above the flat Texas plains. You look out toward the horizon. How far out can you see--that is, how far is your horizon? The Earth's radius is about 6400 km.

You and your housemate have an argument over the cost of the electric bill. You want to turn off the outside porch light before going to bed each night.

Work is a product of A force and distance B force and heat energy C cause and heat energy D cause and effect

An exploration submarine should be able to descend 1200 m down in the ocean. If the ocean density is 1020 kg/m3, what is the maximum pressure on the submarine hull?

Why cooking pans don't have have metal handles?