Chemistry, 06.11.2019 19:31 eshavaggar

Aplane traveled west for 4.0 hours and covered a distance of 4,400 kilometers. what was its velocity?

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Answer from: nourmaali

The velocity is 1,100 $\frac{km}{h}$

Explanation:

Velocity is associated with the change of position of a body over time. In other words, velocity expresses the relationship between the space traveled by an object, the time taken for it and its direction.

So, since velocity considers the direction in which the displacement of an object occurs, it is considered a vector magnitude. In other words, in the velocity it is necessary to take into account also the direction of the mentioned displacement.

In other words, velocity implies the change of position of an object in space within a certain amount of time (that is, speed), added to the direction in which said movement occurs.

The velocity can then be calculated as the displacement (difference between end and initial point) divided by time. Its unit of measure in the International System (S.I.) is the meter per second (m / s). Although the speed can also have units of km / h.

So, in this case:

$velocity=\frac{4,400 kilometers}{4 hours}$

velocity=1,100 $\frac{km}{h}$

The velocity is 1,100 $\frac{km}{h}$

Answer from: Quest

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

Write 15 uses of a mercury barometer along with its characterestics

Answer from: Quest

i think it's c. i'm not sure but i think so.

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