An engineering company needs to solve a design problem.
It is designing a high-speed train to transport
passengers
between Boston and Atlanta.
Which statement is a criterion for this project?
O A. The train must not take more than six years
to build
B. The train must not have wheels with bearings
that need
lubrication,
O C. The train must cost less than $150 million
to design.
D. The train must be able to maintain a speed of
250 km/h.

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.