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3 years ago

13

A transformer is a device used to increase or decrease the voltage through induction. Which fundamental force is responsible for

this induction?ElectromagneticWeak NuclearStrong NuclearGravitational

1 answer:

dlinn [17]3 years ago

5 0

The two nuclear forces are not responsible for this property.

Gravitational is far too weak to make a transformer work.

The answer is electromagnetic.

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When a warm air mass collides with a cold air mass, the warm air mass rises above the cold air mass leading too:

nikdorinn [45]

Answer: It leads to a front. A front is.., I don't know how to explain it, so I'll add a picture. Fronts are made out of clouds and usually bring rain. So the answer is C: The formation of clouds and rain.

Explanation:

7 0

3 years ago

Suzie (of mass 42 kg) is roller-blading down the sidewalk going 32 miles per hour. She notices a group of workers down the walkw

Allisa [31]

Answer:

a) Suzie’s average acceleration = -6.46 m/s²

b) Force exerted to stop Suzie = 271.52 N

Explanation:

a) We have equation of motion, v = u + at

Final velocity, v = 0 m/s

Initial velocity, u = 32 mph = 14.22 m/s

Time, t =2.2 s

Substituting

0 = 14.22 + a x 2.2

a = -6.46 m/s²

Suzie’s average acceleration = -6.46 m/s²

b) Mass of Suzie = 42 kg

Force = Mass x Acceleration

F = Ma

F = 42 x -6.46 =-271.52 N

Force exerted to stop Suzie = 271.52 N

5 0

3 years ago

In a glider stunt at an air show, a towing airplane (motorized plane pulling the gliders) takes off from a level runway with two

irakobra [83]

Answer:

minimum length of runway is needed for take off 243.16 m

Explanation:

Given the data in the question;

mass of glider = 700 kg

Resisting force = 3700 N one one glider

Total resisting force on both glider = 2 × 3700 N = 7400 N

maximum allowed tension = 12000 N

from the image below, as we consider both gliders as a system

Equation force in x-direction

2ma = T -f

a = T-f / 2m

we substitute

a = (12000 - 7400 ) / (2 × 700 )

a = 4600/1400

a = 3.29 m/s²

Now, let Vf be the final speed and Ui = 0 ( as starts from rest )

Vf² = Ui² + 2as

solve for s

Vf² = 0 + 2as

2as = Vf²

s = Vf² / 2a

given that take of speed for the gliders and the plane is 40 m/s

we substitute

s = (40)² / 2×3.29

s = 1600 / 6.58

s = 243.16 m

Therefore, minimum length of runway is needed for take off 243.16 m

4 0

3 years ago

On a speed-time graph, a horizontal line shows the change in speed is ____.

spayn [35]

On a speed/time graph, the height of the line at any point
shows the speed at that moment. If the line is horizontal,
then its height isn't changing, meaning that the speed isn't
changing. It's constant. The change is zero, until the line
starts rising or falling.

4 0

4 years ago

1. Earth is approximately a sphere of radius 6.37х106 m. what are (a) its circumference in kilometers, (b) its surface are in sq

Minchanka [31]

As we know that circumference of the sphere is given as

$C = 4\pi R$

here we know that

$R = 6.37 \times 10^6 m$

now we have

$C = 4\pi (6.37 \times 10^6)$

$C = 8\times 10^7 m$

$C = 8 \times 10^4 km$

PART B)

surface area of the sphere is given as

$A = 4\pi R^2$

$R = 6.37 \times 10^3 km$

$A = 4\pi (6.37\times 10^3)^2$

$A = 5.1 \times 10^8 km^2$

PART C)

Volume of the sphere is given as

$V = \frac{4}{3}\pi R^3$

here we have

$V = \frac{4}{3}\pi(6.37 \times 10^3)^3$

$V = 1.1 \times 10^{12} km^3$

5 0

4 years ago

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