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3 years ago

I feel like I’ve been on this physics exam forever… please help . NO LINKS.

Physics

1 answer:

sesenic [268]3 years ago

4 0

Explanation:

my guess is A

emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state.

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The rate (in mg carbon/m3/h) at which photosynthesis takes place for a species of phytoplankton is modeled by the function P = 9

Ivanshal [37]

Answer:

At light intensity I = 3, is P a maximum

Explanation:

Given:

$P=\frac{90I}{I^2+I+9}$

now differentiating the above equation with respect to Intensity 'I' we get

$\frac{dp}{dI}=\frac{(I^2+I+9).\frac{d(90I)}{dI}-90I.\frac{d((I^2+I+9)}{dI}}{(I^2+I+9)^2}$

$\frac{dp}{dI}=\frac{(I^2+I+9).90-90I.(2I+1)}{(I^2+I+9)^2}$

$\frac{dp}{dI}=\frac{90I^2+90I+810)-(180I^2+90I)}{(I^2+I+9)^2}$

$\frac{dp}{dI}=\frac{-90I^2+810)}{(I^2+I+9)^2}$

Now for the maxima $\frac{dP}{dI}=0$

thus,

$0=\frac{-90I^2+810)}{(I^2+I+9)^2}$

$-90I^2+810=0$

$I^2=\frac{810}{90}$

$I^2=9$

I = 3

thus, <u>for the value of intensity I = 3, the P is maximum</u>

at I = 3

$P=\frac{90\times3}{3^2+3+9}$

$P=\frac{270}{21}$

$P=12.85$

5 0

4 years ago

Plz help 200 pts

slamgirl [31]

Answer:

We just know that the metal is called Vibranium.

to place something is the table we need to know its atomic number and its mass. so if we can get that we can ans it.

Explanation:

5 0

3 years ago

A 50.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.300 and the

Vitek1552 [10]

Answer:

147 N

Explanation:

static friction = frictional force max / normal

normal force = mg = 50 kg × 9.8 m/s² = 490 N

0.3 = Frictional force / 490 N

0.3 × 490 N = 147 N

The body will not move because the frictional force is greater than the force applied.

4 0

3 years ago

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You can make the current in a circuit smaller by?

scZoUnD [109]

Decreasing the amount of current flowing through the circuit by using a 5 volt battery instead of a 10 volt battery.

3 0

3 years ago

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If you were on earth monitoring a person in a rocket ship traveling away from the earth at a speed close to the speed of light,

m_a_m_a [10]

Answer:

There wiil be a reduction in pulse and volume will be reduced

Explanation:

This is due to the relastivistic Doppler effect

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3 years ago