What is the density of the block if it has a mass of 45.5 grams and a volume of 2.4 cm³?

Physics

1 answer:

rjkz [21]3 years ago

5 0

Explanation:

density= mass/volume

therefore;45.5/2.4

=19.0 g/cm³

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How many seconds will it

lozanna [386]

Answer:

200 seconds

Explanation:

1,800 divided by 90 = 200

4 0

3 years ago

If a circular loop of wire of radius 19.7 cm is located in a region where the spatially uniform magnetic field perpendicular to

Alisiya [41]

Answer:

Magnitude of induced emf will be $2.437\times 10^{-3}volt$

Explanation:

We have given radius of the circular loop r = 19.7 cm = 0.197 m

So area of the circular loop $A=\pi r^2=3.14\times 0.197^2=0.1218m^2$

It is given that magnetic field is changing as $2\times 10^{-3}T/sec$

Emf induced in the circular loop is equal to $e=\frac{-d\Phi }{dt}=-A\frac{dB}{dt}$

So emf induced will be equal to $e=\frac{-d\Phi }{dt}=-0.1218\times2\times 10^{-3}=2.437\times 10^{-3}volt$

So magnitude of induced emf will be $2.437\times 10^{-3}volt$

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3 years ago

A neighborhood transformer on the top of a utility pole transforms 12.0 kV 60.0 Hz alternating voltage down to 120.0 V to be use

riadik2000 [5.3K]

Answer:

<em>The primary coil has 13,400 turns</em>

Explanation:

<u>Voltage Transformers</u>

A transformer is an electrical apparatus that converts an alternating electrical voltage to another. Step-down transformers lower the voltage from higher levels (kilovolts) to consumer levels (120/240 Volts).

The ratio between both voltages can be computed as

$\displaystyle r=\frac{V_1}{V_2}$

Where V1 is the primary voltage and V2 is the secondary voltage. This ratio depends on the turns ratio of the coils wounded in a common magnetic core.

$\displaystyle r=\frac{N_1}{N_2}$