Physics, 03.10.2019 00:40 maddie953

Which is the thick white substance that accumulates at the side of a cut in the process of healing?

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There are a variety of possible reasons for a scab turning white during healing. The most common cause is that of trapped moisture. During healing, the wound has a variety of layers of new skin, that can easily allow water in. People who come into contact with water often or have a high water content in their bodies will easily develop white scabs. Other reasons may include the application of too much ointment or the fact that the wound has become infected. An infection usually occurs when bacteria come into contact with the wound, and the immune system responds by trying to remove the infection. This is usually couple with red, itchy and warm surrounding skin, and antibiotics may be required to prevent a blood infection.

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a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

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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