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ohaa [14]
3 years ago
13

Why are power cords coated with a material that has different physical properties than the wire inside?

Physics
1 answer:
Sergeeva-Olga [200]3 years ago
6 0

Power cords are conductors and are covered by insulators. If they were not, then it would be easy to create a short-circuit. It would also be not safe, as a person touching the bare wires would be electricuted.

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Find the ratio of the radii of a baseball to the Earth, knowing that the radius of a baseball is .09 m, and that the Earth's rad
Xelga [282]
0.09 / 6.37 x 10⁶ = 1.4129 x 10⁻⁸

The radius of the baseball is  1.4129 x 10⁻⁸   the radius of the Earth.
6 0
3 years ago
A hot-water radiator has a surface temperatue of 80 o C and a surface area of 2 m2 . Treating it as a blackbody, find the net ra
faust18 [17]

Answer:

925.04 J/s

Explanation:

T = 80 C = 80 + 273 = 353 K

To = 20 c = 20 + 273 = 293 K

A = 2 m^2

Use the formula for Stefan's law

Energy radiated per second

E = \sigma  A \left ( T^{4}-T_{0}^{4} \right )

E = 5.67 \times 10^{-8}\times 2\left ( 353^{4}-293^{4} \right )

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3 0
3 years ago
Convert 9/4 hours into minutes
Eduardwww [97]

Am guessing;

9/4 × 60/1 =135

5 0
3 years ago
What is the use of force to move an object over a distance?
steposvetlana [31]

Answer:

In physics, work is defined as the use of force to move an object. For work to be done, the force must be applied in the same direction that the object moves. Work is directly related to both the force applied to an object and the distance the object moves.                                                                                              <em>[I HOPE THIS HELPS* PLS MARK ME BRAINLIEST]</em>

6 0
3 years ago
A ball is dropped off the side of a bridge,<br> After 1.55 S, how far has it fallen?<br> (Unit=m)
kow [346]

Answer:

Distance S = 11.77 m (Approx.)

Explanation:

Given:

Time t = 1.55 Second

Gravity acceleration = 9.8 m/s²

Find:

Distance S

Computation:

S = ut + (1/2)(g)(t)²

S = (0)(1.55) + (1/2)(9.8)(1.55)²

S = (0)(1.55) + (1/2)(9.8)(1.55)²

Distance S = 11.77 m (Approx.)

7 0
3 years ago
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