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soldier1979 [14.2K]
4 years ago
13

to remove a tight fitting lid from a jar, megan runs the lid under hot water what happens to the jar lid when its temperature in

creases
Physics
1 answer:
Oksi-84 [34.3K]4 years ago
3 0

Answer:

Expands

Explanation:

The tight fitting lid of the jar will expand when Megan runs hot water on it. This makes the lid loose and freely moves.

  • Increase in temperature for most substances causes expansion.
  • A body that expands takes up more volume for the same amount of matter.
  • The tight fitting will be more free to move about and the cover will be released.
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Aleksandr [31]

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The magnetic field strength at the north pole of a 2.0-cm-diameter, 8-cm-long Alnico magnet is 0.10 T. To produce the same field
Sonbull [250]

Answer:

The number of turns of the solenoid is 3536 turns

Explanation:

Given;

magnetic field of the solenoid, B = 0.1 T

current in the solenoid, I = 1.8 A

length of the solenoid, L = 8cm = 0.08m

The magnetic field near the center of the solenoid is given by;

B = μ₀nI

Where;

μ₀ is permeability of free space = 4π x 10⁻⁷ m/A

n is number of turns per length

I is the current in the coil

The number of turns per length is calculated as;

n = B / μ₀I

n = (0.1 ) / (4π x 10⁻⁷ x 1.8)

n = 44203.95 turns/m

The number of turns is calculated as;

N = nL

N = (44203.95)(0.08)

N = 3536 turns

Therefore, the number of turns of the solenoid is 3536 turns

7 0
4 years ago
The ceiling of a large symphony hall is covered with acoustic tiles which have small holes that are 4.35 mm center to center. If
zvonat [6]

Answer:

The distance between their eye and the ceiling is 33.06 m.

Explanation:

Given that,

The ceiling of a large symphony hall is covered with acoustic tiles which have small holes that are 4.35 mm center to center, D = 4.35 mm

Diameter of the eye of pupil, d = 5.1 mm

Wavelength, \lambda=550\ nm

We need to find the distance between their eye and the ceiling. Using Rayleigh criteria, we get the distance as follows :

L=\dfrac{Dd}{1.22\lambda}\\\\L=\dfrac{4.35\times 10^{-3}\times 5.1\times 10^{-3}}{1.22\times 550\times 10^{-9}}\\\\L=33.06\ m

So, the distance between their eye and the ceiling is 33.06 m.

3 0
3 years ago
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