All categories

3 years ago

A transformer is a device that increases or decreases voltage. t/f

Physics

2 answers:

sammy [17]3 years ago

6 0

<span>A transformer is a device that increases or decreases voltage. t/f

The answer is: True my dude
</span>

Dmitry_Shevchenko [17]3 years ago

5 0

Answer:

True.

Explanation:

A transformer is used either to increase or decrease the voltage.

It has two separate sets of coils of wire. The coils connected to the input voltage are called primary and the output coils are called secondary.

If number of windings (or coils) of wire in primary are less than the windings in secondary, it is a step up transformer because output voltage will be more than the input voltage. In this case the output voltage given out by the secondary will be more than the primary.

If the primary coils are more than the secondary, it is called a step down transformer. In this case, secondary voltage (output voltage) will be less than the primary.

You might be interested in

PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!

GarryVolchara [31]

I'm in physics, but I think the answer is 22. The angle of reflection is reflecting whatever the angle was so, in this case, it must be 22

3 0

3 years ago

Read 2 more answers

A 2.4-m-diameter merry-go-round with a mass of 270 kg is spinning at 20 rpm. John runs around the merry-go-round at 5.0 m/s, in

juin [17]

Answer:

23.98 rpm

Explanation:

d = diameter of merry-go-round = 2.4 m

r = radius of merry-go-round = (0.5) d = (0.5) (2.4) = 1.2 m

m = mass of merry-go-round = 270 kg

I = moment of inertia of merry-go-round

Moment of inertia of merry-go-round is given as

I = (0.5) m r² = (0.5) (270) (1.2)² = 194.4 kgm²

M = mass of john = 34 kg

Moment of inertia of merry-go-round and john together after jump is given as

I' = (0.5) m r² + M r² = 194.4 + (34) (1.2)² = 243.36 kgm²

w = final angular speed

w₀ = initial angular speed of merry-go-round = 20 rpm = 2.093 rad/s

v = speed of john before jump

using conservation of angular momentum

Mvr + I w₀ = I' w

(34) (5) (1.2) + (194.4) (2.093) = (243.36) w

w = 2.51 rad/s

w = 23.98 rpm

5 0

3 years ago

What if The rotational speed of Earth increased ?

dsp73

Answer:

This would happen.

Explanation:

If the earth’s rotation speed increases then the weight of the body decreases. This is because you see a moving body on the rotating earth’s surface itself is in the reference frame. So when the earth rotates, the centripetal force acts towards the centre of rotation.

4 0

3 years ago

Two microwave signals of nearly equal wavelengths can gener- ate a beat frequency if both are directed onto the same microwave d

Sonja [21]

Answer:

the longer wavelength is 1.2552 cm

Explanation:

given that

beat frequency $f_{b}$ = 100 MHz = 100 × 10⁶ Hz

λ₁ = 1.250 cm = 0.0125 m

we know that beat frequency $f_{b}$ of two simultaneous frequencies f₁ and f₂ is expressed as;

$f_{b}$ = | f₁ - f₂ |

we know that microwave travels at a speed of light, so for any electromagnetic wave traveling at speed of light c with wavelength λ; frequency is;

f = c / λ

hence our beat frequency $f_{b}$ becomes

$f_{b}$ = c ( 1/λ₁ - 1/λ₂)

to find the longer wavelength, λ₂

$f_{b}$ = c ( 1/λ₁ - 1/λ₂)

divide both side by c

$f_{b}$ /c = ( 1/λ₁ - 1/λ₂)

1/λ₂ = 1/λ₁ - $f_{b}$ /c

λ₂ = [1/λ₁ - $f_{b}$ /c ]⁻¹

so we substitute in our values

we know that speed of light c = 3 × 10⁸

λ₂ = [ (1/0.0125) - (100 × 10⁶ /3 × 10⁸) ]⁻¹

λ₂ = [80 - 0.3333 ]⁻¹

λ₂ = [79.6667 ]⁻¹

λ₂ = 0.01255 m

λ₂ = 0.012552 × 100 cm

λ₂ = 1.2552 cm

Therefore, the longer wavelength is 1.2552 cm

7 0

3 years ago

A space shuttle was launched from the Earth to the moon. The average, or accepted, value of the distance of the Earth to the moo

Allushta [10]

To find the answer it's (theoretical value - experimental value) / theoretical value
(238857-226316)/238857 = 5.25%
The answer is A) 5.25%

7 0

4 years ago