Physics, 12.02.2020 19:20, yeontan

The speed of a box traveling on a horizontal friction surface changes from vi = 13 m/s to vf = 11.5 m/s in a distance of d = 8.5 m. "How long in seconds did it take for the box to slow by this amount, assuming the acceleration is constant?"

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answered: elizaannettem4466

"0.68 s" would be taken by the box to slow by this amount.

Given values are:

Initial velocity,

u = 13 m/s

Final velocity,

v = 11.5 m/s

Distance,

d = 8.5 m

As we know,

→ v^2-u^2 = 2as

By substituting the values, we get

→ (11.5)^2-(13)^2 = 2a(8.5)

→ 132.25-169=17 a

→ $a = -\frac{36.75}{17}$

$= -2.2 \ m/s^2$

hence,

→ Acceleration, $a = \frac{v-u}{t}$

$-2.2 = \frac{11.5-13}{t}$

$t = \frac{1.5}{2.2}$

$= 0.68 \ s$

Thus the above response is right.

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answered: zanestone12

0.68 s

Explanation:

We are given that

Initial velocity of box= u=13m/s

Final velocity of box=v=11.5 m/s

Distance=d=8.5 m

We have to find the time taken by box to slow by this amount.

We know that

v^2-u^2=2as

Substitute the values

(11.5)^2-(13)^2=2a(8.5)

132.25-169=17a

-36.75=17a

$a=\frac{-36.75}{17}=-2.2m/s^2$

We know that

Acceleration= $a=\frac{v-u}{t}$

Substitute the values

$-2.2=\frac{11.5-13}{t}$

$-2.2=\frac{-1.5}{t}$

$t=\frac{1.5}{2.2}=0.68 s$

Hence, the time taken by box to slow by this amount=0.68 s

answered: Guest

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

answered: Guest

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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The speed of a box traveling on a horizontal friction surface changes from vi = 13 m/s to vf = 11.5...