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3 years ago

If humans cannot see ultraviolet waves, how can ultraviolet light be used to gather evidence of a crime?

2 answers:

8 0

It seems that you have missed the given options for this question, but anyway, here is the correct answer. If humans cannot see ultraviolet waves, ultraviolet light can be used to gather evidence of a crime since u<span>ltraviolet light causes substances to fluoresce and give off visible light. Hope this is the answer that you are looking for. Thanks for posting!</span>

Naya [18.7K]3 years ago

5 0

Answer:

The anser is Ultraviolet light causes substances to fluoresce and give off visible light. (C)

Explanation:

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Glucose typically enters the cell through which mechanisms

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Answer:

facilitated diffusion

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3 years ago

Analyze that, “Convection is equal to the Conduction plus fluid flow.”

igomit [66]

Answer:

Convection is equal to the conduction plus fluid flow.

Explanation:

Convection is a mode of heat transfer that requires the movement of the molecules of the medium from one point to another. It takes place majorly in fluids (liquids and gases). While conduction is a process by which heat is transfered by the vibtation of molecules of a medium at their possitions, thereby colliding with other neighbouring molecules to transmit heat.

Before convection could occur, there must be conduction of heat by the molecules of the medium which causes their motion. According to the kinetic molecular theory, any molecule of the medium close to the source of heat conducts heat, becomes less dense and thus moves so that its initial position would be occupied by another denser molecule. This continous process generate convection or convectional current. Therefore, convection is as a result of conduction and fluid flow because a molecule must first conduct heat before it moves.

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3 years ago

What is the Energy Transformation of an electric radiant heater?

bagirrra123 [75]

Answer:

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3 years ago

The oil level in a tank is 2 m above the ground. The tank cover is air tight and the air pressure above the oil surface is 150 k

Andrew [12]

Answer:

a) 24.692 m/s

b) 19.4 m

Explanation:

To calculate the velocity at the nozzle outflow (V2) we use the Bernoulli equation:

$\frac{P1}{pg}+\frac{V1^2}{2g}+Z1=\frac{P2}{pg}+\frac{V2^2}{2g}+Z2$

We know that the velocity above the oil surface (V1) and the pressure at the nozzle outflow (P2) are negligible, the height in the exit is zero (Z2) then:

$\frac{P1}{pg}+Z1=\frac{P2}{pg}+\frac{V2^2}{2g}$

a) The velocity (V2) is:

$\frac{P1}{pg}+Z1=\frac{V2^2}{2g}$

$(\frac{P1}{pg}+Z1)(2g)=V2^2$

$V2=[(\frac{P1}{pg}+Z1)(2g)]^{1/2}$

Substituting the known values we can get the velocity at the out:

Atmospheric pressure= 101000 Pa

Oil density= 0.88x(Water density)=0.88(1000kg/m3)=880kg/m3

$V2=[(\frac{150000Pa+101000 Pa}{(880 kg/m3)(9.81m/s)}+2m)(2(9.81m/s2))]^{1/2}$

$V2=24.692 m/s$

b) To calculate the height we have to apply the Bernoulli equation between the outflow and the maximum height (Z3), so:

$\frac{P2}{pg}+\frac{V2^2}{2g}+Z2=\frac{P3}{pg}+\frac{V3^2}{2g}+Z3$

We know that the velocity above the stream (V3) and the pressure at the nozzle outflow (P2) are negligible, the pressure at the top of the stream (P3) is the atmospheric pressure, then:

$\frac{V2^2}{2g}=\frac{P3}{pg}+Z3$