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3 years ago

Substances will expand when they change from gas to a liquid. True False

Physics

1 answer:

Naddik [55]3 years ago

7 0

Answer:

True

Explanation:

Liquid expands so therefore it is truee

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A physicist is constructing a solenoid. She has a roll of insulated copper wire and a power supply. She winds a single layer of

Leni [432]

Answer:

P =105.44 W

Explanation:

Given that

D= 10 cm ,L= 60 cm

d= 0.1 cm ,B= 6.4 mT

ρ= 1.7 x 10⁻⁸ Ω · m

The number of turns N

N= L/d

N= 60/0.1 = 600 turns

Length of wire

Lc= πDN

Lc= 3.14 x 0.1 x 600

Lc=188.4 m

The magnetic filed given as

$B=\dfrac{\mu_oNI}{L}$

$I=\dfrac{BL}{\mu_oN}$

Now by putting the values

$I=\dfrac{0.0064\times 0.6}{4\pi \times 10^{-7}\times 600}$

I=5.09 A

The resistance R given as

$R=\dfrac{\rho L_c}{A}$

$A=\dfrac{\pi}{4}\times d^2$

$A=\dfrac{\pi}{4}\times (0.1\times 10^{-2})^2$

$R=\dfrac{1.7\times 10^{-8} \times 188.4}{\dfrac{\pi}{4}\times (0.1\times 10^{-2})^2}$

R=4.07 Ω

Power P

p =I²R

P= 5.09² x 4.07 W

P =105.44 W

5 0

3 years ago

Describe the role of the teacher and the learner in a natural science and technology classroom

dem82 [27]

Teacher -> teach the topic
Learner -> learn the topic
Is that what you’re asking?

5 0

3 years ago

What is the velocity of a beam of electrons that goes undeflected when moving perpendicular to an electric and magnetic fields.

Charra [1.4K]

Explanation:

Given that,

Electric field, E = 7900 V/m

Magnetic field, $B=9.1\times 10^{-3}\ T$

(a) Let v is the velocity of a beam of electrons that goes undeflected when moving perpendicular to an electric and magnetic fields. The magnitude of electric force and the magnetic force balance each other as :

$qE=qvB$

$v=\dfrac{E}{B}$

$v=\dfrac{7900\ V/m}{9.1\times 10^{-3}\ T}$

$v=8.68\times 10^5\ m/s$

(b) Let r is the radius of the electron orbit. The radius of the motion of electron is given by :

$r=\dfrac{mv}{qB}$

$r=\dfrac{9.1\times 10^{-31}\ kg\times 8.68\times 10^5\ m/s}{1.6\times 10^{-19}\ C\times 9.1\times 10^{-3}\ T}$

$r=5.4\times 10^{-4}\ m$

Hence, this is the required solution.

3 0

3 years ago

1. The resultant force on a ball is not zero. What will happen to the ball? *

Tju [1.3M]

Answer:

it will more and change direction

Explanation:

because the resultant force (R) is not equal zero so may be there is a force greater than the other one and the ball will more in the direction of greater force.

and it can't be remain stationary because R=! 0 .

7 0

3 years ago

The flow of electric current through a gas without any external influence (ionizer) is called

maksim [4K]

Answer:

self-maintained discharge

Explanation:

5 0

3 years ago