Physics, 04.04.2020 09:45 emilyharper

A soccer player kicks a ball, changing its momentum by 11 kg. M/s, The net force on the ball is 910 N. How long does the soccer player maintain contact with the ball?

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Answer from: Claude512

Contact maintained by the soccer player, with the ball is of 0.01 seconds.

Explanation:

Given:

Change in momentum of the ball, Δp = $11\ kg.m.s^-1$

Net applied force on the ball, F = $910\ N$

We have to find for how long the soccer player maintains contact with the ball.

Formula to be used:

Acceleration = Ratio of change in velocity and time.

⇒ $a=\frac{\triangle v}{\triangle t}$

⇒ $\triangle v=a \triangle t$

Momentum = Product of mass of an object and applied time.

⇒ $\triangle p=m \triangle v$

⇒ $\triangle p=ma \triangle t$ ..plugging $\triangle v=a \triangle t$

⇒ $\triangle p=F \triangle t$ ..Newtons seconds law, F=ma

⇒ $\triangle t=\frac{\triangle p}{F}$ ..re-arranging the equation.

Plugging the value of force and momentum we have.

⇒ $\triangle t=\frac{\triangle p}{F}$

⇒ $\triangle t=\frac{11}{910}$

⇒ $\triangle t =0.01$ sec

So,

The soccer player maintain contact with the ball for 0.01 seconds.

Answer from: Quest

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic = - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day

Answer from: Quest

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

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A soccer player kicks a ball, changing its momentum by 11 kg. M/s, The net force on the ball is 910...

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