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Roman55 [17]
3 years ago
11

MIDTERM

Physics
1 answer:
egoroff_w [7]3 years ago
3 0
Loop law for v1, r1, r2, r3
lv1 = current from v1
Ir3 = current pass r3
- v1 + Iv1(r1) + Iv1(r2) + Ir3(r3) = 0
-5 + Iv1(200) + Iv1(200) + Ir3(100) = 0
400Iv1 = 5 - 100Ir3 ...(1)

current law at B
Iv1 + I1 - Ir3 - I2 = 0
Iv1 + 0.001 - Ir3 - 0.005 = 0
Iv1 = Ir3 + 0.004 ...(2)

solve by using (1),(2)
Ir3=0.0068A, Iv1=0.108A

Vb = Ir3(r3) = 0.0068(100) = 0.68V

Va = Vb + Iv1(r2) = 0.68 + 0.0108(200) = 0.68 + 2.16 = 2.84V

power = I^2(r)
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Answer:

4. Force = 178.6 Newton.  

5. Acceleration = 2.28 m/s².

6. Force = 178.6 Newton.

Explanation:

4. Given the following data;

Acceleration = 3.8 m/s²

Mass = 47kg

Force = mass * acceleration

Force = 47 * 3.8

<em>Force = 178.6 Newton. </em>

5. Given the following data;

Force = 785N

Mass = 345kg

Acceleration = force/mass

Acceleration = 785/345

<em>Acceleration = 2.28 m/s²</em>

6. Given the following data;

Acceleration = 6m/s²

Force = 32N

Mass =force/acceleration

Mass = 32/6

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5 0
3 years ago
In a 2-dimensional coordinate system, which of these is an example of an object's position?
Serjik [45]

' B ' is the only choice on the list that tells you a definite place, where you could go to pick up the object or meet somebody.

But in order to use it, you also have to know where the origin of coordinates is ... the point (0, 0) .

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No, I'm wrong about that.  You have to know where SOME other point is, but that doesn't have to be (0, 0).

4 0
3 years ago
A ball is thrown straight up from ground level. It passes a 2-m-high window. The bottom of the window is 7.5 m off the ground. T
slamgirl [31]

Answer:

u=14.48m/s

Explanation:

From the question we are told that:

Height of window h=2m

Height of window off the ground h_g=7.5m

Time to fall and drop t=1.3s

 

Generally the Newton's equation motion  is mathematically given by

 s=ut+\frac{1}{2}at^2

Where

h=ut+\frac{1}{2}at^2

2=u1.3-\frac{1}{2}*9.8*1.3^2

2=u1.3-8.281

u=7.91m/s^2  

Generally the Newton's equation motion  is mathematically given by

2as=v^2-u^2

Where

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-2*9.8*7.5=(7.91)^2-u^2

-147=62.5681-u^2

u=\sqrt{209.5681}

u=14.48m/s

Therefore the  ball’s initial speed

u=14.48m/s

8 0
3 years ago
Why do astronauts float aboard the international space station?
lianna [129]
They’re falling toward earth & moving forward at about the same velocity. because the downward and forward forces are nearly equal, the astronauts are not pulled in any specific direction, so they float . <span>
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What is the charge of an atom with 21 protons and 6 electrons
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Answer:

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Explanation:

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