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3 years ago

Which inventor created a delivery system for electricity that was deemed safer than Thomas Edison's system?

2 answers:

5 0

c. George Westinghouse is the inventor who created a delivery system for electricity that was deemed safer than Thomas Edison's system.

SVETLANKA909090 [29]3 years ago

4 0

<h3>Answer;</h3>

C. George Westinghouse

<h3>Explanation;</h3>

George Westinghouse was an inventor who is significant in promoting the use of electricity for power and transportation. He created the first large system to supply electricity for multiple uses.
He formed the Westinghouse electric and manufacturing company in 1884. He created delivery system for electricity that was deemed safer than that of Thomas Edison. 
He also developed a transformer that could bring alternating current electricity down form high voltage to low and hence making it possible to transmit it for long distances while making it ready for use.

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A very small source of light that radiates uniformly in all directions produces an electric field amplitude of 8.45 V/m at a poi

Mandarinka [93]

Answer:

4.43 kW

Explanation:

Since Intensity I = P/A = E²/2cμ₀ where P = Power, A = Area = 4πr² where r = distance from source = 61 m and E = electric field amplitude = 8.45 V/m.

P = E²A/2cμ₀ = E²4πr²/2cμ₀ = 2πE²r²/cμ₀

= 2π(8.45 V/m)²(61 m)²/3 × 10⁸ m/s × 4π × 10⁻⁷ Tm/A

= 4428.1 W

= 4.4281 kW ≅ 4.43 kW

6 0

3 years ago

A 70.0-kg skier is sliding at 4 m/s when they slide down a 2m high hill. At the bottom of the hill they run into a large 2800 N/

Katarina [22]

Answer:

$\Delta x=245\ mm$

Explanation:

Given:

mass of skier, $m=70\ kg$

initial velocity of skier, $u=4\ m.s^{-1}$

height of the hill, $h=2\ m$

spring constant, $k=2800\ N.m^{-1}$

final velocity of skier before coming in contact of spring:

Using eq. of motion:

$v^2=u^2+gh$

$v^2=4^2+9.8\times 2$

$v=5.9666\ m.s^{-1}$

Now the time taken by the skier to reach down:

$v=u+gt$

$5.9666=4+9.8\ t$

$t=0.2007\ s$

Now we calculate force using Newton's second law:

$F=\frac{dp}{dt}$

$F=\frac{m(v-u)}{t}$

$F=\frac{70\times(5.9666-4)}{0.2007}$

$F\approx686\ N$

∴Compression in spring before the skier momentarily comes to rest:

$\Delta x=\frac{F}{k}$

$\Delta x=\frac{686}{2800}$

$\Delta x=0.245\ m$

$\Delta x=245\ mm$

4 0

3 years ago

A 3 kg ball rolls at 2m/s does this system favor kinetic energy or potential energy?

MissTica

Answer:

Kinetic energy

Explanation:

Total energy of any system is always conserved.

$E = K +U$

E= Total energy

K = kinetic energy

U = Potential energy

Kinetic energy is the energy acquired by the system due to the virtue of it's motion.

Potential energy is the energy acquired by the system due to the virtue of it's configuration.

Also, Kinetic energy $K = \frac{1}{2} m v^{2}$

$K = \frac{1}{2} \times 3 \times 2^{2}$

$K = 6 J$

5 0

3 years ago

Is this statement true or false?

Brums [2.3K]

A fertilized cell divides many times to form an embryo. - true

Human reproduction requires two reproductive cells from each parent. - true

Growth is caused by cells in your body dividing and making new cells. - false

A cell nucleus contains DNA, which is a chemical code for all inherited traits. - true

7 0

3 years ago

Read 2 more answers

A car goes from point A to point B, five miles away and then returns to point A. The car is going 15 mph.

Alex73 [517]

Answer: B) 0 mph

Explanation:

Velocity is a vector quantity. It can be measured as rate of change of displacement.

$velocity\frac{Displacement}{time}$

Displacement is the straight path length between final and initial position of the body in motion.

It is given that the car goes from point A to point B and the returns to Point A. Hence, the net displacement of the car is 0 as the car comes back to its initial position.

Therefore, the velocity of the car is 0 mph.

Option B is correct.

3 0

3 years ago