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Oxana [17]
3 years ago
7

Westinghouse and Edison fought what was known as the war of the currents. Eventually, Westinghouse triumped using Alternating Cu

rrent for power distribution. Alternating current is better for power generation because A) direct current is unsafe. B) alternating current produces flutuating magnetic fields. C) alternating current provides a more constant current flow. D) direct current cannot be produce electricity without a battery.
Physics
2 answers:
yawa3891 [41]3 years ago
7 0
It is B! I know because i just took a USA test prep on it.
DerKrebs [107]3 years ago
6 0
The answer is B! :) Hope it helped
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h20

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What is the distance a truck can travel if it moves 7 m/s for 20 seconds?
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if it moves 7m/s, that means every second it goes 7m.  Now we just multiply by the time (20 seconds) and end up with 140m.

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Complete the paragraph to compare Uranus and Neptune.
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So, the blanks should be filled with:

Sun

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4 years ago
A B-52 bomber jet flies at a horizontal velocity of 286.2 m/s and at an altitude of 7500 m above the ground.
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you need to divide 7500/286.2

3 0
3 years ago
A device for training astronauts and jet fighter pilots is designed to rotate the trainee in a horizontal circle of radius 11.0
kvv77 [185]

The velocity of the trainee is 29 m/s or 0.42 rev/s

<h3>Further explanation</h3>

Acceleration is rate of change of velocity.

\large {\boxed {a = \frac{v - u}{t} } }

\large {\boxed {d = \frac{v + u}{2}~t } }

<em>a = acceleration (m / s²)v = final velocity (m / s)</em>

<em>u = initial velocity (m / s)</em>

<em>t = time taken (s)</em>

<em>d = distance (m)</em>

Centripetal Acceleration of circular motion could be calculated using following formula:

\large {\boxed {a_s = v^2 / R} }

<em>a = centripetal acceleration ( m/s² )</em>

<em>v = velocity ( m/s )</em>

<em>R = radius of circle ( m )</em>

Let us now tackle the problem!

<u>Given:</u>

Radius of horizontal circle = R = 11.0 m

Force Felt by the Trainee = F = 7.80w

<u>Unknown:</u>

Velocity of Rotation = v = ?

<u>Solution:</u>

F = ma

F = m\frac{v^2}{R}

7.80w = m\frac{v^2}{R}

7.80mg = m\frac{v^2}{R}

7.80g = \frac{v^2}{R}

7.80 \times 9.8 = \frac{v^2}{11.0}

v^2 = 840.84

v \approx 29 ~m/s

\omega = \frac{v}{R}  → in rad/s

\omega = \frac{v}{2 \pi R}  → in rev/s

\omega = \frac{29}{2 \pi \times 11.0}

\omega \approx 0.42 ~ rev/s

<h3>Learn more</h3>
  • Velocity of Runner : brainly.com/question/3813437
  • Kinetic Energy : brainly.com/question/692781
  • Acceleration : brainly.com/question/2283922
  • The Speed of Car : brainly.com/question/568302
  • Uniform Circular Motion : brainly.com/question/2562955
  • Trajectory Motion : brainly.com/question/8656387

<h3>Answer details</h3>

Grade: High School

Subject: Physics

Chapter: Circular Motion

Keywords: Velocity , Driver , Car , Deceleration , Acceleration , Obstacle , Speed , Time , Rate , Circular , Ball , Centripetal

6 0
3 years ago
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