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sergejj [24]
3 years ago
9

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

6 0
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}

Being N1 the number of turns of the coils of the primary side and N2 the number of turns in the secondary coil. Both relations give us

\displaystyle \frac{N_1}{N_2}=\frac{V_1}{V_2}

Solving for N1

\displaystyle N_1=\frac{V_1}{V_2}\cdot N_2

We have:

V_1=12,000\ V\\V_2=120\ V\\N_2=134

Calculate N1

\displaystyle N_1=\frac{12,000}{120}\cdot 134=13,400

The primary coil has 13,400 turns

8 0
3 years ago
Two horizontal pipes have the same diameter, but pipe B is twice as long as pipe A. Water undergoes viscous flow in both pipes,
zheka24 [161]

Answer:

c) 2Q

Explanation:

From the given information:

The pressure inside a pipe can be expressed by using the formula:

\Delta P = \dfrac{128 \mu L Q}{\pi D^4}

Since the diameter in both pipes is the same, we can say:

D = D_A = D_B

where;

length of the first pipe A L_A = L and the length of the second pipe B L_B = 2L

Since the difference in pressure is equivalent in both pipes:

Then:

\dfrac{128 \mu L_1Q_1}{\pi D_1^4} = \dfrac{128 \mu L_2Q_2}{\pi D_2^4}

\dfrac{ L_1Q_1}{D_1^4} = \dfrac{ L_2Q_2}{D_2^4}

\dfrac{ LQ_1}{D^4} = \dfrac{ 2LQ}{D^4}

\mathbf{Q_1 = 2Q}

6 0
3 years ago
The Lamborghini Huracan has an initial acceleration of 0.75g. Its mass, with a driver, is 1510 kg.
Cerrena [4.2K]

Answer:

11109.825 N

Explanation:

Given Data:

total mass =m=1510 kg

initial acceleration (a) =0.75g                  ( g=9.81 m/s² )

F=ma

  = (1510)*( 0.75*9.81)

  = 11109.825 N

4 0
4 years ago
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