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3 years ago

Can someone help with these/

Physics

1 answer:

Dmitry_Shevchenko [17]3 years ago

4 0

Three

Right Hand Rule

The index finger points in the direction of v

The electric field is designated by the the thumb

The middle finger is B

Paint these directions on your fingers (and thumb).

Using your right hand, B is point out of the page. Your fingers are mutually perpendicular.

Which ever answer says out of the page, is the answer. B

Four

Many critters like dogs are color blind. Those poor unfortunates see only gray. We have a wider range. Our eyes do see color (visible light) but we are not limited. The correct answer is B. We can make devices that respond to visible light like lasers so in effect they are "seeing" visible light. The answer is B.

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snow_lady [41]

Answer:

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2 years ago

The second part of estate planning consists of:

Akimi4 [234]

Transferring your estate in the manner you have specified

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2 years ago

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A pizza delivery driver must make three stops on her route. She will first leave the restaurant and travel 4 km due north to the

topjm [15]

Explanation:

This question involves continuous displacement in various directions. When it becomes difficult to imagine, vector analysis becomes handy.

Let us denote each of the individual displacements by a vector. Consider the unit vectors $\vec{i}\textrm{ and }\vec{j}$ as the unit vectors in the direction of East and North respectively.

By simple calculations, we can derive the unit vectors $\vec{j},\frac{-\vec{i}-\vec{j}}{2}\textrm{ and }\frac{-\frac{1}{2}\vec{i}+\frac{\sqrt{3}}{2}\vec{j}}{2}$ in the directions North, $45^{o}$ South of West and $60^{o}$ North of West respectively.

So Total displacement vector = Sum of individual displacement vectors.

Displacement vector = $4(\vec{j})+6(\frac{-\vec{i}-\vec{j}}{2})+5(\frac{-\frac{1}{2}\vec{i}+\frac{\sqrt{3}}{2}\vec{j}}{2})=-4.25\vec{i}+3.165\vec{j}$

Magnitude of Displacement = $|-4.25\vec{i}+3.165\vec{j}|=5.3km$

∴ Total displacement = $5.3km$

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3 years ago

A simple machine can change the direction of a force.<br> O True<br> O False

tino4ka555 [31]

☁️ Answer ☁️

annyeonghaseyo!

Your answer is:

True.

Several simple machines change the direction of the applied force. These include lever, fulcrum and the pulley.

Hope it helps.

Have a nice day hyung/noona!~ ￣▽￣❤️

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2 years ago

A laser pointer used in a lecture hall emits light at 650 nm what is the frequency

Aleksandr-060686 [28]

<span>The formula for frequency is speed of light divided by wavelength. 650 nm represents the wavelength and 3x10^8 m/s is the speed of light. If you convert 650nm to meters you get 6.5x10^-7 m so you can divide using the formula above, giving you 4.6x10^14 1/s or Hz, the unit of frequency in Physics.</span>

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2 years ago