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3 years ago

5.

Physics

2 answers:

Nostrana [21]3 years ago

7 0

Current and resistance are related by an Inverse relationship , your answer will be (A)

prisoha [69]3 years ago

3 0

It’s A. The current is directly proportional to the voltage and inversely proportional to the resistance.

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The copper windings of a motor have a resistance of 50 Ω at 20° C when the motor is idle. After the motor has run for several ho

Drupady [299]

Answer:

The temperature of the windings are 60.61 °C

Explanation:

Step 1: Data given

Resistance = 50 Ω

Temperature = 20.0 °C

After the motor has run for several hours the resistance rises to 58Ω.

Step 2: Calculate the new temperature

Formula: R = Rref(1 + α(T-Tref))

⇒with α = temperature coëfficiënt of Cupper at 20 °C = 0.00394/°C

⇒with Tref = reference temperature = 20°C

⇒with T = end temperature = TO BE DETERMINED

⇒with R = resistance at end temperature = 58Ω

⇒with Rref = resistance at reference temperature = 50 Ω

==> T = (R/Rref - 1)/α + Tref

T = (58/50) - 1 )/ 0.00394 + 20

T = 60.61 °C

The temperature of the windings are 60.61 °C

5 0

4 years ago

7 One lb of Refrigerant 134a contained within a piston–cylinder assembly undergoes a process from a state where the temperature

julsineya [31]

Answer:

$\Delta S = S_2-S_1 = 0.08835 \frac {BTU} {Lb ^ {\circ} R}$

Explanation:

A) In order to solve the table it is necessary to consult tables A11-E and A10E for refrigerant R134-a

In this way we obtain that:

$S_1 = S_f = 0.0648 \frac {BTU} {Lb. ^ {\circ} R}$

In this way,

$S_2 = S_f + x_2 (S_g-S_f) = 0.0902 + 0.5 (0.2161-0.0902)$

$S_2 = 0.15315 \frac {BTU} {Lb ^ {\circ} R}$

In this way the entropy change is,

$\Delta S = S_2-S_1 = 0.08835 \frac {BTU} {Lb. ^ {\°} R}$

B) Whenever entropy yields a positive result, the process can be carried out adiabatically.

7 0

3 years ago

A shell is fired from the ground with an initial speed of 1.74 ✕ 103 m/s at an initial angle of 58° to the horizontal.

ValentinkaMS [17]

Answer:

a) horizontal range s=277671.77 m

b) time the shell is in motion 301.143 s

Explanation:

Is a parabolic movement so the velocity have two components:

$v = 1.74 x 10^{3} ( \frac{m}{s} )$

$\alpha = 58$ °

$v_{y} =v*Sen (\alpha )\\v_{x} =v*Cos (\alpha )$

$v_{y} =1740*Sen (58 )\\v_{x} =1740*Cos (58)$

$v_{y} = 1475.603 \frac{m}{s}\\v_{x} = 922.059 \frac{m}{s}\\$

$t= \frac{2*v_{y} }{g}$

$t= \frac{2*1475.603 }{9.8}$

$t= 301.143 s$

$v= \frac{s}{t} \\s= v_{x}*t$

$s= 922.059 \frac{m}{s} * 301.143 s$

$s = 277671.77 m$

4 0

4 years ago

What is the answer . y+-3=6

Gre4nikov [31]

y=9 because you would need to subtract 3 from both sides because its a -3, adding 3 would cancel it out on one side leaving y=9. 9 is the answer:)-May

7 0

3 years ago

Read 2 more answers

What is the number “4” in SiCl4? a subscript a coefficient a product a reactant

Svetlanka [38]

Answer: 4 is the subscript in $SiCl_{4}$ .

Explanation:

We know that,

Subscript: The number of atom present in a given compound.

In $SiCl_{4}$ , 4 represents the number of chlorine atom in 1 mole of Silicon tetra chloride.

Coefficient: Number of atom which is used in reaction.

For example: In $3SiCl_{4}$ , 3 is the coefficient of silicon tetra chloride.

A Product : In the balance equation, right hand side is called product.

A reactant : In the balance equation, left hand side is called reactant.

For example: the balance equation is

$2Mg+O_{2}\rightarrow 2MgO$

In this equation, $2Mg+O_{2}$ is the reactants and $2MgO$ is products.

Hence, 4 is the subscript in $SiCl_{4}$ .

4 0

3 years ago

Read 2 more answers