force of 20 N starts acting on it in the opposite direction?

А The object's velocity will increase.

B

The object's velocity will decrease.

с

The object will come to a stop.

D

The object will move at the same velocity.

B. Is correct answer

how can understanding velocity help to prevent a mid-air collision

**Answer:**

To maintain enough time to prevent a collision, a system operating in air traffic where aircraft speed does not

fall below 100 km/h (most medium-sized UAVs and GA aircraft) will need to be able to detect obstacles which

subtend an arc-width of as small as 0.125 mra

Why does the first row in our periodic table

only have two elements?

A) because each orbital in every sub-level only holds

two electrons

B) because Bohr only knew about two elements

C) because the first energy level only holds two

electrons total

Help me plssss

**Answer:**

B

**Explanation:**

♡ ∩_∩

（„• ֊ •„)♡

┏━∪∪━━━━┓

Hopes this helps

♡ good luck 。 ♡

┗━━━━━━━┛

**Answer:**

C option is correct

**Explanation:**

C) because the first energy level only holds two electrons.

A washing machine spin dries clothes. It starts spinning at 20 rad/s and slows down to 8 rad/s while turning through 500 revolutions.

a. What is the angular acceleration?

b. How much time does it take to slow down?

**Answer:**

i do not know man

**Explanation:**

lol

The **angular acceleration** of the washing machine spin is 53.5 x 10⁻³.

**Angular acceleration** is defined as the **time rate **of change of **angular velocity **in a **circular **motion.

Here,

Initial angular velocity, ω₁ = 20 rad/s

Final angular velocity, ω₂ = 8 rad/s

Angular displacement, θ = 2[tex]\pi[/tex] x no. of revolutions

θ = 2[tex]\pi[/tex] x 500 = 1000[tex]\pi[/tex]

a) Using the **equation **of **circular motion**,

ω₂² - ω₁² = 2αθ

Therefore, the **angular acceleration**,

α = (ω₂² - ω₁²)/2θ

α = (20² - 8²)/2 x 1000[tex]\pi[/tex]

α = 53.5 x 10⁻³ rad/s²

b) **Time **taken by the machine spin to **slow down**,

t = (ω₂ - ω₁)/α

t = (20 - 8)/53.5 x 10⁻³

t = 224.2 s

Hence,

a) The **angular acceleration** of the washing machine spin is 53.5 x 10⁻³.

b) **Time **taken by the washing machine spin to **slow down **is 224.2 s.

To learn more about **angular acceleration**, click:

https://brainly.com/question/30237820

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Which of the following describes a change in energy that occurs as an acorn falls from a tree toward the ground

the last one which is D

As an acorn falls from a tree toward the ground, **gravitational potential energy** is **converted** into **kinetic energy**.

To find the correct option among all the options, we need to know about the **conversation of energy**.

Thus, we can conclude that **option (d) **is correct.

Learn more about **the conversation of gravitational potential energy to kinetic energy** here:

brainly.com/question/11333389

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what is Schwartzchild radius??

no copied answers plz

**Answer:**

Schwarzschild radius is the radius of the boundary of a hole of this type.

difference between sold and liquid

**Explanation:**

Solids have closely packed particles and vibrate about a fixed position, they also have a fixed volume.

liquid have close particles but which are able to move with a bit of kinetic energy, for this reason they have no fixed volume but take the volume of the container or vessel

Help please!!! Physics circular motion

**Answer:**

2. 3.1415 m/s

3. 0.63m

4. 0.006 m/s^2

**Explanation:**

2. v=(2*pi*r))/T, put in values and solve.

3. Circumference=2*pi*radius, radius is 0.1m, plug in and solve.

4. a=(v^2)/r, (don't worry about converting to meters, since units are the same in kilometers, they will cancel out) plug in values and solve.

That's it!

is a rare disorder that includes the inability to feel pain.

A. Somatoform pain disorder

B. Congenital analgesia

C. Kinesthesis

D. Anesthesia

Please select the best answer from the choices provided

Ο Ο Ο

B.

D

The rare **disorder** that includes the inability to feel pain is called **Congenital analgesia**. That is **option B.**

**Congenital analgesia** is defined as ,the name implies, a genetic disorder that rarely occurs which makes one not to be able to feel pain.

It is an **autosomal recessive** disorder in which there is genetic changes in the **PMRD12 gene.**

Therefore, the rare disorder that includes the inability to feel pain is called **Congenital analgesia**.

Learn more about **pain** here:

https://brainly.com/question/25753221

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The Berlin marathon is one of the fastest marathons courses; many world records have been set there. In 2014 Dennis Kimetto ran the 42.195 km in 2 hours, 2 minutes and 5 seconds. what was his average speed?

**Answer:**

about 2000 klm per min

**Explanation:**

How do you get on the cheer squad?!

**Answer:**

you don't cuz cheerleaders only get in the way of the football game

HELPPPP WILL MARK B IF CORRECT!!!!

If freckles is the dominant trait, this means every one of the genes with an upper case have freckles. This gives us:

3/4 of the offspring will have freckles. You can also say 75%

Hope this helps!! :)

3/4 of the offspring will have freckles. You can also say 75%

Hope this helps!! :)

Please help me with this

I can’t see the full pic

**Answer:**

I can't really see it sorry

There is a small hole of radius r in a hollow sphere, which is immersed in a liquid. Upto what maximum depth it can be immersed so that liquid may not enter in it? Density of liquid is d and surface tension is T.

**Answer:**

h = 4T/dgr

**Explanation:**

Using Laplace law for spherical bubble, the pressure difference P'- P = 4T/r where T = surface tension and r = radius of sphere.

Now, the pressure difference on the hollow sphere P' - P = dgh where d = density of liquid, g = acceleration due to gravity and h = maximum depth to which sphere must be immersed.

So dgh = 4T/r

h = 4T/dgr

HELP PLEASE

44. Two wave pulses are traveling along a string

toward each other as represented in the diagram

below.

(D is interference)

The phenomenon of **interference** occurs when two **wave pulses **are traveling along a **string **toward each other. **Option D** is correct.

The **result **of two or more **wave trains **flowing in **opposite **directions on a crossing or **coinciding **pathways. This phenomenon is known as the **interference **of **waves**.

The effect is the sum of the **individual wave **amplitudes at each site where more than one **wave **is present.

When two **wave** **pulses** are traveling along a **string **toward each other. They **meet **and the phenomenon is occur known as **interference**.

Hence the **phenomenon **of **interference **occurs when **two **wave pulses are **traveling **along a **string **toward each other.

To learn more about the **interference** **of waves** refer to the link;

https://brainly.com/question/16098226

Car A is stopped at a traffic light. At the moment it starts to move again, it is situated 330 m from car B, which is traveling in the opposite direction at a constant velocity of 18.0 m/s. If car A accelerates at a rate of 3.0 m/s^2, where and after how long will the two cars pass each

other?

Please answer this question with steps..

**Answer:**

hopr

**Explanation:**

**Answer:**

How do u delete your questions on this app

A rocket sled accelerates forward from 10 m/s to 50 m/s in 2 seconds. What is the acceleration of the sled?

**Answer:**

**Explanation:**

Use kinematics equations

You have Vi=10m/s and Vf=50m/s and t=2s

Use equation Vf=Vo+at 50=10+a(2)

50=10+2a

40=2a

a=20 m/s^2

What is the limiting factor of speed for an object falling through the air?

⭐**Air Resistance** is the factor, which limits the speed of an object falling through the air...⭐

____________________________________________________

*<Judge It Yourself...>*

Hope it helps you! ヅ

**✪ Be Brainly ✪**

pulling a 15 kg mass from a bucket from a depth of 6 meters well a man shook 20 sec what was his power

**Answer:**

power=44.1 watts

Hope it helped

PLS mark BRAINLIEST

From an apple tree 2 metres high, a 100g mass apple fell of the tree, what work did it do?

**Answer:**

When an apple falls from the tree to the ground, its energy of position (stored as gravitational potential energy) is converted to kinetic energy, the energy of motion, as it falls. When the apple hits the ground, kinetic energy is transformed into heat energy.

Each bat can produce different frequencies of ultrasound. Explain why this is useful if there are many bats hunting together.

**Answer: Although low frequency sound travels further than high-frequency sound, calls at higher frequencies give the bats more detailed information--such as size, range, position, speed and direction of a prey's flight. Thus, these sounds are used more often.**

**Explanation:**

Skyscrapers are made of concrete and glass, concrete and glass are made of sand,so that makes skyscrapers giant sandcastles. Change my mind

Awnswer:

what are the answer chosices

Explanation:

Your a genius this make so much sense

A book is sitting on a table. Which of the following is true about the table? O A. It is pushing up on the book. O B. It exerts no force on the book at all. O C. It is pulling down on the book. D. It can affect the mass of the book.

**Answer:**

yes it does exert a force, it pushes it up

**Explanation:**

this is called normal force

if it didn't exert a force the book would keep going down

according to newton every force has an equal amd opposite reaction

so the book exerts a force on the table and vice versa

hope this helped

How much work did he do if he traveled 20 meters?

A lot sndndnsndndndndnndndndnd

rock at the edge of a cliff has kinetic energy because of its position.

True

False

its false rock is at edge

A weight-lifter raises a 2000 N weight through a vertical height of 2.0m in 0.80 s.

What useful power does he develop in doing this?

A

800 W

B

3200W

с

4000 W

D

5000W

Answer:

D. 5000W

Explanation:

Given the following data;

Force = 2000N

Distance = 2m

Time = 0.8s

To find the power;

First of all, we would determine the workdone by the weightlifter

Workdone = force * distance

Workdone = 2000 * 2

Workdone = 4000N

Now, we can find the power using the formula;

Power = workdone/time

Substituting into the equation, we have

Power = 4000/0.8

Power = 5000 Watts

Elements with positive valences usually ______ electrons

A. Donate

B. Accept

C. Have no

D. Create

The answer is donate, therefore elements with positive valences usually donate electrons

An ohm is best described as a unit of measure for...

A. electrical resistance

B. electrical current

C. electrical potential difference

D. magnetic field strength

The answears is b :))

Help me on this question

Adjust the height of the wooden rod so that it just touches the surface of the water. Switch on the lamp and motor and adjust the speed of the motor until low frequency waves can be clearly observed... Count the number of waves passing a point in ten seconds then Divide by ten to record frequency.

A 55 kg boy is riding a skateboard at a speed of 1.0 m/s. What is his

kinetic energy?

**Answer:**

27.5

**Explanation:**

KE=1/2m(v)^2

A mass sitting on a horizontal, frictional surface is attached to one end of a spring; the other end is fixed to a wall. 3.0 J of

work is required to compress the spring by 0.20 m. If the mass is released from rest with the spring compressed, it

compresses a maximum acceleration of 15 m/s?.

a) Determine the spring constant.

b) Determine the mass.

d) What is the velocity when the mass reaches maximum acceleration?

c) Deterinine the net force when the mass passes 0.10m compression

d) Determine the acceleration when the mass passes 0.10m compression.

e) Determine the velocity when the mass passes 0.10m compression

**Answer:**

I started answering this before everything was erases, but briefly

W = 1/2 K x^2 so K = 2 W / x^2 = 6 * 25 = 150

Also F = - K X = 150 * 1/5 = 30 N at max extension

m = F / a = 30 /15 = 2 kg

Since max extension occurs at t = 0 you can write

x = A sin ω t

v = ω A cos ω t

a = -ω^2 A sin ω t note that there is no phase angle here

Also at .1 compression

.1 = .2 sin ω t and sin ω t = 1/2 and ω t = 30 deg = pi / 6

Substiture these values above to get velocity and acceleration when

ω t = 30 deg

A student used a microscope to study four members of the phylum Ciliophora. Members ofthis phylum move when propelled by hundreds of tiny cilia.ParameciumcaudatumParameciumaureliaOsALLA3220ParameciumbursariaParameciummultimicronucleatumVIITTEITAAlthough these organisms belong to the same phylum, they are classified as different -A familiesB speciesC kingdomsD orders
You own your own business and you need to interview 2 person to have a specific job.(BE CREATIVE)Write 10 question for your interview...
CAN SOMEONE PLEASE TRANSLATE THIS FOR ME?!! PLEASEEEE IM LITERALLY BEGGING
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please view math question and help!!
GEOMETRY. Need help i will give brainliest
Frank says to Mary, "If you wash every window in my house today, I'll pay you $200.1don't care if you do it, but there is $200 in it for you if you do." Mary washes 12 of the 20windows in Frank's house by 2:00 p.m. At this point, which of the following is true?Group of answer choicesMary is obligated to finish washing the windows.There is no contract yet in this situation.Frank can revoke his offer to pay Mary the $200 for washing the windows.Mary has formed a contract by beginning to wash the windows.
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