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3 years ago

Does a set of all sets contain itself?

Physics

1 answer:

ipn [44]3 years ago

5 0

The set of all sets that are not members of themselves. This contradiction is Russell's paradox.

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What is the magnetic force on a 200 cm length of (straight) wire carrying a current of 30 A in a region where a uniform magnetic

Bezzdna [24]

Answer:

F = 0.112 N

Explanation:

To find the magnitude of magnetic force on the wire, you use the following formula:

$|\vec{F}|=|i\vec{L}\ X\ \vec{B}|=iLBsin\theta$ (1)

L: length of the wire = 200cm = 0.2m

i: current in the wire = 30 A

B: magnitude of the magnetic field = 0.055 T

θ: angle between the directions of L and B = 20°

You replace the values of L, i, B and θ in the equation (1):

$|\vec{F}|=(30A)(0.2m)(0.055T)sin(20\°)=0.112N$

hence, the magnetic force on teh wire is 0.112N

3 0

3 years ago

Suppose you buy some inflated party balloons that are at room temperature (about 20°C). What will happen to those balloons if yo

Zina [86]

The balloons will begin to shrink or deflate.

7 0

3 years ago

Which option below correctly compares the average annual dose of background radiation to the dose liked to an increased cancer r

julia-pushkina [17]

The answer for this question would be choice "<span>B. The average annual dose of background radiation is 250 times smaller than the dose linked to increased cancer risk."

You only have to compare 4.0 x 10^-4 and 1.0 x 10^-1. And if you can observe carefully, when you try to multiply the average annual dose of background radiation by 250, you would get 0.1 which is equivalent to the amount of annual dose linked to increased cancer risk. Therefore, the answer is B.</span>

6 0

3 years ago

The largest building in the world by volume is the boeing 747 plant in Everett, Washington. It measures approximately 632 m long

Schach [20]

Explanation:

Given that,

The dimensions of the largest building in the world is 632 m long, 710 yards wide, and 112 ft high. It basically forms a cuboid. The volume of a cuboidal shape is given by :

Since,

1 meter = 3.28084 feet

632 m = 2073.49 feet

1 yard= 3 feet

710 yards = 2130 feet

V = lbh

$V=2073.49 \ ft\times 2130\ ft\times 112\ ft$

$V=494651774.4\ ft^3$

$V=4.94\times 10^8\ ft^3$

Also,

$V=(4.94\times 10^8\ ft^3)(\dfrac{1\ m}{3.281})^3$

$V=1.39\times 10^7\ m^3$

Hence, this is the required solution.

3 0

4 years ago

An AC source operating at 59 Hz with a maximum voltage of 170 V is connected in series with a resistor (R = 1.2 kΩ) and an induc

Alexxandr [17]

I = V/Z

V = voltage, I = current, Z = impedance

First let's find the total impedance of the circuit.

The impedance of the resistor is:

$Z_{R}$ = R

R = resistance

Given values:

R = 1200Ω

Plug in:

$Z_{R}$ = 1200Ω

The impedance of the inductor is:

$Z_{L}$ = j2πfL

f = source frequency, L = inductance

Given values:

f = 59Hz, L = 2.4H

Plug in:

$Z_{L}$ = j2π(59)(2.4) = j889.7Ω

Add up the individual impedances to get the Z, and convert Z to polar form:

Z = $Z_{R}$ + $Z_{L}$

Z = 1200 + j889.7

Z = 1494∠36.55°Ω

I = V/Z

Given values:

V = 170∠0°V (assume 0 initial phase)

Z = 1494∠36.55°Ω

I = 170∠0°/1494∠36.55°Ω

I = 0.1138∠-36.55°A

Round the magnitude of I to 2 significant figures and now you have your maximum current:

I = 0.11A

5 0

3 years ago