An ultrasound wave vibrates 30,000 times per second. what is the frequency

Answers

Answer 1

Answer:
"Hertz" is the unit of reciprocal time, "per second".

"30,000 per second" means "30,000 Hertz".

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Why dog pants during summer use the cocept of evaporation

Answers

Every "warm-blooded" living thing needs a way to make heat and keep it
when its body is too cold inside, and a way to get rid of extra heat when
its body is too hot inside.

Moving around (using muscles) makes heat inside, and the animal needs
a way to get rid of the heat. Fast.

Evaporation is a very effective way to get rid of heat.

Human animals do it by perspiring. We excrete moisture through our skin,
and when the moisture evaporates, that takes heat away very efficiently.
That's why we like to fan ourselves when we're hot ... moving more air
past our skin makes moisture evaporate faster.

Dogs don't perspire, so they badly need another way to get rid of heat
in a hurry.

They do it through their mouth. They put water in their mouth if it's available,
or else just collect a lot of saliva in there if there's no other water, and then
they blow air over it to evaporate it and get rid of heat. Panting moves more
air over the moisture, which causes more evaporation and more heat loss.

In which state of matter is a substance unable to transfer heat by convection

Answers

Convection is the movement of molecules in a solution according to the kinetic energy imparted by heat energy. This happens in liquids, gases, and plasmas. It can't occur in solids simply because they are just that. Solids. If the solid is heated enough to break the cohesion then it will turn to a liquid. Hope this helped. :)

Convert 550 cm into m. Please show your work

Answers

There are 100cm in one metre. Hence, divide 100 by 550 to figure out for much 550cm is in meters. It is 5.5m.

Polychlorinated biphenyls (PCBs) have been banned because they are an environmental hazard. Which of the following was NOT a reason for banning them?

Answers

Answer:

PCBs have high electrical resistance and are excellent insulating materials.

Explanation:

Polychlorinated biphenyls [PCBs] are industrial chemical compounds made by man, which contains carbon, hydrogen and chlorine atoms. They can be used in the production of paints and dyes, heat transfer, etc.

There has been the ban on the use of these compounds because they are said to be very stable, and yield slowly to degradation by nature. They have low and not high electrical resistance.

What is the diffrent between displesment and a distance

Answers

DISTANCE

-length of the path between two points

-doesn't have to be a straight path

-has no direction

DISPLACEMENT

-the length from the starting point to the ending point

-must be a straight path

-must have direction (north, south, east, west, up, down)

EXAMPLE-If you wanted to know the distance from your house to the park, you could say 'three blocks north and then two blocks west' but for displacement, you could just cut through houses and backyards to get to the destination.

Hope that makes some sense :)

Displacement is the difference between two points where as distance is just a signle point.

What is the force required to produce an acceleration of 46.4

Answers

That depends on the mass of the object, and the unit of the '46.4' .

If the '46.4' is ' meters per second² ' , then the force required is

(mass of the object in kilograms) x (46.4) newtons .

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