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UkoKoshka [18]
3 years ago
10

What is the lowest possible temperature? a 273 K b absolute zero со °C d 100 °C

Physics
1 answer:
Firlakuza [10]3 years ago
7 0

Answer:

b- absolute zero

*( And it's called zero kelvin)

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How much power does a hair dryer require to transform 198 000 J of energy in 15 mins?
Marina86 [1]

(198,000 joule / 15 minute) x (minute / 60 sec) = 220 joule/sec = <em>220 watts


</em>
7 0
3 years ago
Why is it important to have a control setup in an experiment?
Lana71 [14]

Explanation:

A control is important for an experiment because it allows the experiment to minimize the changes in all other variables except the one being tested.

5 0
3 years ago
Suppose two parallel-plate capacitors have the same charge Q, but the area of capacitor 1 is A and the area of capacitor 2 is 2
almond37 [142]

Answer:

V' = V/2

Explanation:

The voltage across a parallel plate capacitor is given as follows:

V = Q/C

where,

V = Voltage across capacitor

Q = Charge on Capacitor

C = Capacitance of Capacitor = A∈₀/d

Therefore,

V = Qd/A∈₀

where,

A = Area of plate

d = distance between plates

∈₀ = permittivity of free space

FOR CAPACITOR 1:

Q = Q

d = d

A = A

V = V

Therefore,

V = Qd/A∈₀   --------------- equation (1)

FOR CAPACITOR 2:

V' = ?

Q' = Q

d' = d

A' = 2A

Therefore,

V' = Q'd'/A'∈₀

V' = Qd/2A∈₀

V' = (1/2)(Qd/A∈₀)

using equation (1):

<u>V' = V/2</u>

8 0
3 years ago
A metal ball sits motionless on a flat surface. Which of these would make the ball move?
Digiron [165]

Answer:

D

Explanation:

Unbalanced forces move stuff. Gravity would only increase/decrease movement if the object was already in motion.

6 0
3 years ago
Read 2 more answers
The wavelength of an EM wave is 800 nm. Calculate its frequency, angular frequency, wavenumber, wave vector amplitude, energy, a
irga5000 [103]

Answer:

Given: Wavelength (λ) = 800 nm

Frequency \nu=\frac{c}{\lambda} \Rightarrow \nu = \frac{3\times10^8}{800\times 10^{-9}} =3.75\times10^{14} Hz

Angular frequency \omega=2\pi \nu \Rightarrow \omega = 2\pi 3.75\times10^{14} = 23.55\times10^{14} rad/s

Wavenumber, k=\frac{2\pi}{\lambda} \Rightarrow k =\frac{2\pi}{800\times 10^{-9}}=7.85\times 10^6m^{-1}

wave vector amplitude |k| = k = 7.85\times 10^6m^{-1}

energy, E = h \nu \Rightarrow E = 6.63\times 10^{-34}\times 3.75\times10^{14} = 24.86\times 10^{-20}J

momentum, p=\frac{h}{\lambda} = \frac{6.63\times 10^{-34}}{800\times 10^{-9}}= 8.28\times 10^{-28}Ns

3 0
4 years ago
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