1.the less mass in a given volume of air, the

more dense the air

less dense the air

more the air weighs

greater the air pressure

2.
carbon dioxide makes up of earth’s atmosphere.

less than 1%

between 5% and 10%

more than 10%

about 3%

3.
the two most abundant gases in the atmosphere are

carbon dioxide and oxygen

nitrogen and hydrogen

carbon dioxide and nitrogen

nitrogen and oxygen

4.
what is true about the air pressure acting on the roof of your house?

it is much greater on top of the roof than below it.

it comes from the air within a few feet of your rooftop.

it comes from the column of air above your roof.

it is much greater underneath your roof than on top of it.

5.
what is the first layer of atmosphere an astronaut passes through during reentry from space?

stratosphere

ionosphere

exosphere

mesosphere

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.

You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 23.7n and the spring scale reads 13.8n. what is the magnitude of the force that earth exerts on the bag?

In the future, people will only enjoy one sport: electrodisc. in this sport, you gain points when you cause metallic discs hovering on a field to exchange charge. you are an electrodisc player playing the popular four disc variant. the disks have charges of qa = −8.0 µc, qb = −2.0 µc, qc = +5.0 µc, and qd = +12.0 µc. (1) you bring two disks together and then separate them. you measure the resulting charge of these two disks and find that it is +5.0 µc per disk. which two disks did you bring together? (a) a and b (b) a and c (c)a and d (d)b and c(e) b and d (f) c and d. (2) you bring three disks together and then separate them. you measure the resulting charge of these three disks and find that it is +3.0 µc per disk. which three disks did you bring together? a, b, and c (a) a, b, and d (c) a, c, and d (d) b, c, and d. (3) given the resulting charge of each disk measured in (b) is +3.0 µc, how many electrons would you need to add to a disk of this charge to electrically neutralize it? electrons