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ValentinkaMS [17]
4 years ago
12

What is the difference between direct current and alternating current?

Physics
2 answers:
Elan Coil [88]4 years ago
6 0
Direct currents flow in one direction, while in alternating currents the flow could change/alternate.
IRINA_888 [86]4 years ago
5 0
In a direct current, the electric charge, or current, only flows in one direction. In an alternating current, the electric charge changes periodically.  
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Why is it when a ballerina stands on her toes she exerts more pressure than an elephant on all fours
Murrr4er [49]

I'm not sure that's true ... we'd need to see some numbers.
But if it is true, it's the same reason why some places don't
want ladies to walk on their floors with high heels.

Pressure is        (weight) divided by (area).

Pressure exerted
by a ballerina      =    (ballerina's weight)/(area of her toe on the floor)

Pressure exerted
by an elephant    =    (elephant's weight)/(area of 4 elephant feet)

Pressure exerted by
a lady in high heels  = (lady's weight) / (area of 1 or 2 heels)

You can see that the greatest weight might not exert the greatest
pressure, and the smallest weight might not exert the smallest
pressure.  The area is important, and it takes an awful lot of toes
or high heels to equal the area of one or more elephant's feet.
7 0
4 years ago
How is a flywheel constructed to maximize its rotational inertia?
BigorU [14]

Answer:

It is constructed with a high mass and a high raidus.

Explanation:

The rotational inertia I for every object is calculated as:

cMR^2 = I

where c is a constant, M is the mass of the object and R the radius of the object.

So, for a flywheel, the rotational inertia is calculated as:

I = \frac{1}{2}MR^2

Then, for constructed a flywheel with the maximun rotational inertia we have to set the maximum mass and the maximun radius.

6 0
3 years ago
What is thermal physics​
viktelen [127]

Answer:

Thermal physics is the combined study of thermodynamics, statistical mechanics, and kinetic theory of gases. This umbrella-subject is typically designed for physics students and functions to provide a general introduction to each of three core heat-related subjects. Other authors, however, define thermal physics loosely as a summation of only thermodynamics and statistical mechanics.

Explanation:

5 0
3 years ago
Research is done only after a hypothesis is written
artcher [175]
True you cant research something without having a hypothesis of what you think would happen
6 0
3 years ago
A girl and her crew walked 50 meters in 10 seconds what was the speed ?
lakkis [162]

Answer: 11.18 mph

Explanation: divide and multiply the numbers

3 0
3 years ago
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