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4 years ago

8

What it means to view something from a frame of reference. Give an example to illustrate your explanation

1 answer:

maks197457 [2]4 years ago

4 0

Frame of reference refers to something that is not moving with respect to an observer that can be used to detect motion. For the children on the bus, if they use other children riding the bus as their frame of reference, they do not appear to be moving. But if they use objects outside the bus as their frame of reference, they can tell they are moving.

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A wye-connected load has a voltage of 480v applied to it. What is the voltage drop across each phase

rodikova [14]

Answer:

$Y_A=277.128 \angle 30v$

$Y_B=277.128 \angle (-150)v$

$Y_C=277.128 \angle (90)v$

Explanation:

From the question we are told that

Voltage $V_L_L =480v$

Generally in a case of Y_connection $V_p_ h$ is mathematical represented as

$V_p_h=\frac{V_l_l}{\sqrt{3}} \angle (\phi-30)v$

Generally voltage drop across phase A

$Y_A=\frac{408}{\sqrt{3}} \angle -(0-30)$

$Y_A=277.128 \angle 30v$

Generally voltage drop across phase B

$Y_B=277.128 \angle (-30-120)$

$Y_B=277.128 \angle (-150)v$

Generally voltage drop across phase C

$Y_C=277.128 \angle (-30+120)$

$Y_C=277.128 \angle (90)v$

3 0

3 years ago

Resistance of a conductor is directly proportional to length. True or False

Yanka [14]

True.

As the length of the conductor increases, so also the resistance to the flow of current increases along the conductor.

7 0

3 years ago

What will happen if you rub two different materials together?

Dafna1 [17]

It will cause heat from friction

6 0

4 years ago

Read 2 more answers

7 the density of the american white oak tree is 752 kilograms per cubic meter. if the trunk of an american white oak tree has a

alexdok [17]

First, we determine the volume of the trunk by finding first the radius from the circumference through the equation,

<span> C = 2πr</span>

<span> r = C/2π</span>

Substituting the known values,

<span> r = 4.5/2π = 0.716 m</span>

Then, we calculate for the volume through the equation,

<span> V = πr2h</span>

<span> V = π(0.716 m)2(8m) = 12.9 m3</span>

Multiplying the calculated value to the density will give the mass as,

<span> Mass = (12.9 m3)(752 kg/m3) = <span>9699.36 kg</span></span>

3 0

4 years ago

A girl in a canoe uses a paddle to push the canoe at rest from a dock giving it a speed of 0.30 m/s. If the paddle is in contact

Anika [276]

Canoe will start from rest and reach to speed v = 0.30 m/s

so here we will have

$v_i = 0$

$v_f = 0.30 m/s$

now in this speed increase it will take 0.75 second of time

so we can find the acceleration of canoe as we know that acceleration is rate of change in velocity

$a = \frac{v_f - v_i}{t}$

$a = \frac{0.30 - 0}{0.75} = 0.4 m/s^2$

now we can find the force on Canoe by using Newton's II law

$F = ma$

here m = mass of girl + mass of canoe

m = 27 + 52 = 79 kg

now by above formula

$F = 79 * 0.4 = 31.6 N$

so here it will have net force F = 31.6 N

6 0

3 years ago