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Tamiku [17]
4 years ago
5

HELP PLEASE BRAINLESS ANSWER

Physics
1 answer:
qwelly [4]4 years ago
4 0
Condensation endothermic or exotérmica
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20 POINTS TRUE OR FALSE:
romanna [79]
False because the first law of motion is the crash I think I’m in middle school
8 0
3 years ago
Which statement describes why energy is released in a nuclear fission reaction based on mass-energy equivalence?
lawyer [7]

Answer:

A is the answer!

Explanation:

Edge 2021

9 0
3 years ago
An aluminum wire with a diameter of 0.115 mm has a uniform electric field of 0.235 V/m imposed along its entire length. The temp
tekilochka [14]

Answer with Explanation:

We are given that

Diameter of coil=d=0.115mm

Radius, r=\frac{d}{2}=\frac{0.115}{2}=0.0575mm=0.0575\times 10^{-3} m

Using 1mm=10^{-3} m

Electric field=E=0.235V/m

T=55 degree C

T_0=20^{\circ} C

\rho_0=2.82\times 10^{-8}\Omega m

\alpha=3.9\times 10^{-3}/C

(a).We know that

\rho=\rho_0(1+\alpha(T-T_0))

Substitute the values

\rho=2.82\times 10^{-8}(1+3.9\times 10^{-3}(55-20))

\rho=3.2\times 10^{-8}\Omega m

(b).Current density,J=\frac{E}{\rho}

Using the formula

J=\frac{0.235}{3.2\times 10^{-8}}=7.3\times 10^6A/m^2

c.Total current,I=JA

Where A=\pi r^2

\pi=3.14

Using the formula

I=7.3\times 10^6\times 3.14\times (0.0575\times 10^{-3})^2

I=0.076A

d.Length of wire=l=2m

V=El

Substitute the values

V=0.235\times 2=0.47 V

5 0
3 years ago
A laser emits light at power 6.20 mW and wavelength 633 nm. The laser beam is focused (narrowed) until its diameter matches the
Ipatiy [6.2K]

Answer:

a) S = 1.69 10⁹ W/m², b)  P = 5.63 Pa , c) F = 20.6 10⁻¹² N

Explanation:

a) The intensity defined as the energy per unit area

    S = U / A

Area of ​​a circle is

    W = 6.2 mw = 6.2 10-3 W

    R = 1080 nm = 1080 10⁻⁹ m  = 1.080 10⁻⁶ m

   A = π R2

   A = π (1,080 10⁻⁶)²

   A = 3.66 10 -12 m²

   S = 6.2 10-3 / 3.66 10-12

   S = 1.69 10⁹ W / m²

b) The radiation pressure

   P = 1 / c (dU / dt) / A

   S = (dU / dt) / A

   

   P = S / c

   P = 1.69 10 9 / 3. 108

   P = 5.63 Pa

c) the definition of pressure is force over area

   P = F / A

   F = P A

   F = 5.63 3.66 10⁻¹²

   F = 20.6 10⁻¹² N

d) for this we use Newton's second law

   F = ma

   a = F / m

8 0
3 years ago
Qliestion 5 (1 point)
love history [14]

Answer:

-3.33 ms^-2

Explanation:

Hope it helps

4 0
3 years ago
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