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3 years ago

There are two types of magnets some of them are _ and some are ___

Physics

2 answers:

kogti [31]3 years ago

8 0

Answer:

There are many types of magnets, which are generally divided into two categories: permanent magnet and a soft magnet.

Explanation:

tensa zangetsu [6.8K]3 years ago

7 0

There are temporary magnets and permanent magnets. these are categorized by their source of magnetism

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A wave is sent along the first rope transmitting a power of 57.3 W. It has a wavelength of 5.54 cm and velocity of 13.87 m/s The

Serhud [2]

Answer:

$A = 2.43*10^{-3} m$

Explanation:

power through string can be determined as shown in figure

$P = 2\pi ^2 HVA^2F^2$

Where

P = 57.3 W

V = 13.87 m/s

H = 567 g/m

we know that

$V = f *\lambda$ $\lambda = \frac{v}{f}$

therefore $P = 2\pi ^2 HVA^2(\frac{v}{f})^2$

$57.3 = \frac{2\pi ^2 * 0.567 *13.87^{3}* A^2}{(5.54*10^{-2})^2}$

$A = 2.43*10^{-3} m$

7 0

3 years ago

Air with a mass flow rate of 2.3 kg/s enters a horizontal nozzle operating at steady state at 450K, 350kPa, and a velocity of 3

MissTica

Answer:

(a) $A_1=0.283m^2$

(b) $Q=-105.5kW$ : From the air to the surroundings.

Explanation:

Hello,

(a) In this case, we can compute the area at the entrance by firstly computing the inlet volumetric flow:

$V_1=\frac{mRT_1}{P_1M}= \frac{2.3\frac{kg}{s} *8.314\frac{kPa*m^3}{kmol* K}*450K}{350kPa*28.97\frac{kg}{kmol} } =0.849\frac{m^3}{s}$

Then, with the velocity, we compute the area:

$A_1=\frac{V_1}{v_1}=\frac{0.849\frac{m^3}{s} }{3\frac{m}{s} } =0.283m^2$

(b) In this case, via the following energy balance for the nozzle:

$Q-W=H_2-H_1+\frac{1}{2} mV_2^2-\frac{1}{2} mV_1^2$

We can easily compute the change in the enthalpy by using the given Cp and neglecting the work (no done work):

$\Delta H=H_2-H_1=mCp\Delta T=2.3kg/s*1.011\frac{kJ}{kg*K}*(300K-450K)\\ \\\Delta H=-348.795kW$

Finally, the heat turns out:

$Q=-348.795kW+\frac{1}{2}*2.3\frac{kg}{s}*[(460\frac{m}{s})^2 -(3\frac{m}{s})^2 ]\\\\Q=-348.795kW+243329.65W*\frac{1kW}{1000W}\\ \\Q=-105.5kW$

Such sign, means the heat is being transferred from the air to the surroundings.

Regards.

4 0

3 years ago

A rocket weighs 9800 n what is its mass

rusak2 [61]

Answer:

the mass of 1000 kg

Explanation:

Hope this helps :) mark me as brainliest pls

8 0

3 years ago

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Difference between scissors and nut cracker

Pavel [41]

But cracked cracks nuts while scripts cut

4 0

3 years ago

A whistle of frequency 516 Hz moves in a circle of radius 64.3 cm at an angular speed of 17.9 rad/s. What are (a) the lowest and

Arisa [49]

Answer:

(a) 498.6 Hz

(b) 534.6 Hz

Explanation: Please see the attachments below

5 0

3 years ago

There are two types of magnets some of them are _______ and some are _________

There are two types of magnets some of them are _ and some are ___