Physics, 05.01.2020 06:31 bree6754

Which best describes a characteristic of the jet stream?
a-it forms a boundary between a cold air mass and a warm air mass
b-it creates the high winds around the eye of a hurricane
c- it forces the hot air along the equator to rise to areas in north america
d- it causes high-pressure air masses to rotate clockwise

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Answer from: doggylover6633

A-It forms a boundary between a cold air mass and a warm air mass

Explanation:

Jet stream is a very fast air stream that occurs in the upper troposphere. Jet streams occur around the earth surrounding it and following an undulating course. These air jets were discovered during the air raids in World War II.

Occurring in the upper levels of the troposphere, this current is of great importance to aviation and can be harnessed to provide fuel economy to the aircraft that penetrate them by taking advantage of the momentum provided by their intense winds. There are two types of jet stream: the subtropical jet, with higher altitude being found between latitudes of 20 ° and 30 °; and the lower altitude polar jet, being generally located between the circumpolar region and the average latitudes (40 ° -70 °). Regardless of the type, jet streams form a boundary between a cold air mass and a hot air mass.

Answer from: Quest

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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Which best describes a characteristic of the jet stream?
a-it forms a boundary between a cold...

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