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3 years ago

Problem #1- In the first scene in which Miss Clark appears, she is supposed to be wearing a BLACK dress.

Physics

2 answers:

ASHA 777 [7]3 years ago

7 0

Answer:

You would have to shine green Light on the actress to make the dress appear to be red.

Explanation:

The reason it would appear to be red is because green reflects the red colour and absorbs the rest. So, when green light is shone on the dress, it absorbs all of the green light and not reflecting anything.The dress then appears to beblack.

katrin [286]3 years ago

6 0

Answer:

Blue Lighting

Explanation:

In order to make red look black, you must use blue light. The blue would be absorbed and there would be no red light to reflect.

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A battery with an emf of 12.0 V shows a terminal voltage of 11.8 V when operating in a circuit with two lightbulbs rated at 3.0

Blababa [14]

Answer:

$R = 24 ohm$

Explanation:

As we know that terminal voltage and EMF of cell is given as

$V = EMF - ir$

$ir = 12 - 11.8$

$ir = 0.2 Volts$

resistance of two bulbs is given as

$R = \frac{V^2}{P}$

$R = \frac{12^2}{3}$

$R = 48 ohm$

now these two bulbs are connected in parallel

so equivalent resistance is given as

$\frac{1}{R} = \frac{1}{R_1} + \frac{1}{R_2}$

$\frac{1}{R} = \frac{1}{48} + \frac{1}{48}$

so we have

$R = 24 ohm$

3 0

3 years ago

You want to use the idea of electromagnetic induction to make the bulb in your small flashlight glow; it glows when the potentia

makkiz [27]

a) 57.5 m/s

b) Yes

Explanation:

According to Faraday-Newmann-Lenz's law, the electromotive force induced in the coil due to the change in magnetic flux through it is given by:

$\epsilon=-\frac{N \Delta \Phi}{\Delta t}$

where

N is the number of turns in the coil

$\Delta \Phi$ is the change in magnetic flux

$\Delta t$ is the time interval

The change in magnetic flux can be written as

$\Delta \Phi = A\Delta B$

where

A is the area of the coil

$\Delta B$ is the variation of the strength of the magnetic field

Re-writing the equation,

$\epsilon=-\frac{NA\Delta B}{\Delta t}$

To make the bulb glowing, the induced emf must be:

$\epsilon=1.5 V$

And we also have:

N = 100

$\Delta B=0 T-3.6\cdot 10^{-2} T=-0.036 T$

$A=2.9\cdot 10^{-4} m^2$

So we can find the maximum time required to induce this emf:

$\Delta t=-\frac{NA\Delta B}{\epsilon}=-\frac{(100)(2.9\cdot 10^{-4})(-0.036)}{1.5}=6.96\cdot 10^{-4} s$

Since the length to cover in this time is

L = 4.0 cm = 0.04 m

The speed should be

$v=\frac{L}{t}=\frac{0.04}{6.96\cdot 10^{-4}}=57.5 m/s$

Yes: if the coil is moved at a speed of 57.7 m/s, then the potential difference induced in the bulb will be 1.5 V, which is enough to make the bulb glowing.

6 0

3 years ago

Which type wire should be used to increase resistance

8_murik_8 [283]

Nichrome wire. That's the stuff that toasters are made from. The resistance is pretty high, considering the diameter. 1 meter is at about the same guage as that listed below for copper is about 96 ohms.

Most of the time you are trying to use wire with the least resistance.

A meter of copper has a listed resistance of 0.024 ohms / meter. The wire is a 19 guage wire which makes it pretty thin.

===============

I'm not sure what you are asking. If want the resistance of something in terms of what would increase the resistance of the same material for both calculations then

Rule 1: It you decrease the wire diameter, you increase the resistance

Rule 2: If you increase the length of the wire, you increase the resistance.

Both rules assume you are using something like copper.

7 0

3 years ago

Read 2 more answers

Where is the deepest part of the ocean

Mariana [72]

Answer:

Trenches are the deepest part of the oceans, narrow and long depressions on the sea floor. One good example is the Mariana Trench, the deepest part of the ocean

Explanation:

5 0

3 years ago

What are the stages of stellar evolution

Rudik [331]

Giant Molecular Cloud

Protostar

T-Tauri

Main Sequence

Subgiant, Red Giant, Supergiant

Core fusion

Red Giant, Supergiant

Planetary Nebula or Supernova or if they are big enough a black hole

Remnant

3 0

4 years ago

Read 2 more answers