Which best describes friction? A. a downward pull when objects fall through the air B. a constant force that acts on objects that rub together C. a downward pull on objects that roll on bumpy surfaces D. a constant force that pulls two objects toward each other
PLSSS I NEED HELP 20 POINTS!!!

Answer:

235.2 m

Explanation:

Given:

v₀ = 0 m/s

v = 24 m/s

t = 19.6 s

Find: Δx

Δx = ½ (v + v₀) t

Δx = ½ (24 m/s + 0 m/s) (19.6 s)

Δx = 235.2 m

Initial speed = zero

Final speed = 24 m/s

Time interval = 19.6 s

We have to find distance traveled by during the given interval of time[tex].[/tex]

★ Acceleration of car :

➠ a = (v - u)/∆t

➠ a = (24 - 0)/19.6

➠ a = 1.22 m/s²

★ Distance traveled by car :

➤ v² - u² = 2as

➤ 24² - 0² = 2(1.22)s

➤ 576 = 2.44s

➤ s = 576/2.44

➤ s = 236 m

Answer:

Explanation:

The momentum of an object given it's mass and velocity can be found by using the formula

From the question

mass = 0.25 kg

velocity = 15 m/s

We have

momentum = 0.25 × 15

We have the final answer as

Hope this helps you

filling it up

Explanation:

Answer:

The average acceleration of the object is 0.5 cm/s^2. Answer: A)

Explanation:

Average Acceleration

The average acceleration of a moving object is the rate at which the speed changed over time in a specific period. It can be calculated as follows:

[tex]\displaystyle \bar a=\frac{v_f-v_o}{t}[/tex]

Where vf is the final speed, vo is the initial speed and t is the time.

The speed-time shows the speed starts at 0 cm/s and ends at 4 cm/s over the 8 seconds period. The average acceleration is:

[tex]\displaystyle \bar a=\frac{4-0}{8}=0.5[/tex]

The average acceleration is 0.5 cm/s^2

A) Correct. The average acceleration is 0.5 cm/s^2

B) Incorrect. The average acceleration is 0.5 cm/s^2

C) Incorrect. The average acceleration is 0.5 cm/s^2

D) Incorrect. The average acceleration is 0.5 cm/s^2

Answer:

A) 0.5 cm/s2

Explanation

I took the quiz the correct answer is A

Answer:

(B) tightly packed protons and neutrons

Explanation:

Thus, correct answer is

(B) tightly packed protons and neutrons

The nucleus of most atoms is composed of tightly packed protons and neutrons

The nucleus of an atom possess the following properties:

Therefore, the nucleus is compose of tightly packed protons and neutrons

learn  more: https://brainly.com/question/25298820?referrer=searchResults

Answer:

x = A sin w t         for SHM where w = angular frequency

sin w t = x / A = .12 / .15 = .8    where w t is the angle in degrees

w t = 53.1 deg       (w itself is in rad / sec)

since v = A w cos w t  

then v / x = w cos w t / sin w t = w / tan w t

w = v / x * tan 53.1 = 1.7 / .12 * tan 53.1 = 18.9 /sec

Also for SHM    w = (k / m)^1/2

m = k / w^2 = 75 / 18.9^2 = .21 kg

Any of the pieces of hard whitish tissue making up the skeleton in humans and other vertebrates.

The calcified material of which bones consist

Answer:

Where speed limit of speed camera is 50 km/h.

Explanation:

Speed cameras work on the principal that photos reflected from the moving car have a higher or lower frequency. This is the Doppler principal. In a  car traveling at the speed of light, the waves/particles will not be able to catch up with that car thus no photon will reflect back to the receiver/speed camera thus no speed will be record. Such a speed is impossible to achieve due to the amount of infinite energy expenditure required. This means if the speed is higher and approaching that of light, the frequency of reflected photons will be very high causing high amounts of energy that could damage the speed camera and cause detection. When the car travels at a higher speed, the photos frequency is high thus more energy they will carry and high chances of the vehicle being detected. This means the time interval of photos taken will be smaller.

Answer:

the answer is c testable

Answer:

1.  B

2. A

3. C

Explanation:

Answer:6m

Explanation:

I guessed the answer and it was right. It was not the tall ones like 16 or 150 because it only took 1.1 second

Given that,

A penny takes 1.1 seconds to hit the ground.

To find,

How high up is the window?

Solution,

When the penny is dropped, its initial velocity is equal to 0 i.e.[tex]u=0[/tex]. The second equation of motion is used to find the relation between position and time. The second equation of motion is :

[tex]s=ut+\dfrac{1}{2}at^2[/tex]

Where

s is the distance

a is acceleration

Here, s = the height of the window from the ground and a = g i.e. acceleration due to gravity

So,

[tex]s=\dfrac{1}{2}gt^2[/tex]

Put all the values,

[tex]s=\dfrac{1}{2}\times 9.8\times (1.1)^2\\\\s=6.05\ m[/tex]

or

[tex]s=6\ m[/tex]

Answer:

The window is [tex]6\ m[/tex] high. The correct option is (d).

Reference:

https://brainly.com/question/12746005

Answer:

time and cost

Explanation:they have to pay for the pizza and take time to eat it

Answer:

B: Family and Friends

Explanation:

According to the class I had on this a few years ago, I can confirm that this was the answer.

My answer would be this because you are socializing with friends (according to the question) and you would just select it automatically due to background knowledge.

Hope I helped! ☺

Answer:

Explanation:

According to me, humans visiting an alien planet is more likely. This is because the allien planets may not have higher levels of technology.

Whereas in today's world, the technology have come to aqquire a very high position. So it likely that humans could visit the alien planets because of the technology evolved by them.

Hope this helps

plz mark as brainliest!!!!!!

acceleration is considered to describe an increase or positive change of speed or velocity But deceleation is considered to describe a decrease or negative change of speed or velocity

Answer:

[tex]\boxed {\tt 108.695652 \ cm^3}[/tex]

Explanation:

Volume can be found by dividing the mass by the density.

[tex]v=\frac{m}{d}[/tex]

The mass is 100 grams and density is 0.920 grams per cubic centimeters.

Therefore,

[tex]m=100 \ g \\d= 0.920 \ g/cm^3[/tex]

Substitute the values into the formula.

[tex]v=\frac{100 \ g}{0.920 \ g/cm^3}[/tex]

Divide. Note that the grams, or "g" will cancel each other out.

[tex]v- 108.695652 \ cm^3[/tex]

The volume of the ice cube is 108.697652 cubic centimeters.

In financial markets, a pivot point is a price level that is used by traders as a possible indicator of market movement. A pivot point is calculated as an average of significant prices from the performance of a market in the prior trading period.

Answer:

if it is at a speed of 12.5 m / s it would take 2 minutes

Explanation:

lol i’m in your physical science class what was the answer

Answer:

Explanation:

20

Answer:

C

Explanation:

It says is it a good idea the person so 1 person can say no and the other one can say yes so it is asks for a opinion

A question that asks for an opinion is as follows:

Thus, the correct option for this question is C.

An opinion may be defined as a type of viewpoint, judgment, or statement that is not conclusive, rather than facts, which are true statements. It may vary from person to person, topic to topic, and condition to condition.

The opinion of any individual belongs or relates to one particular person rather than to other people. For example, in this given scenario, some reply to the question with a yes answer. In a manner, it is definitely a good idea to try to establish human colonies on Mars. While some categorized themselves on no side.

Therefore,  the correct option for this question is C.

To learn more about Opinion, refer to the link:

https://brainly.com/question/25607827

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Answer:

The spring constant,k is measured in newtons per meter

Answer:

Answer:

The answer is four hundred twenty six or 426

Answer:

426

Explanation:

Answer:

when an object has more velocity, it tends to have less potential energy and more kinetic energy.

Explanation:

kinetic energy is the energy of movment and velocity helps to describe movement

Answer:

B. 300 W

Explanation:

2.5 * 120 = 300

Watts is the unit of power

Answer:

Acceleration is considered to describe an increase or positive change of speed or velocity. On the other hand, deceleration is considered to describe a decrease or negative change of speed or velocity.

Explanation:

(a) What is the maximum height the arrow will attain?

Given:

v₀ᵧ = 54 sin 27.0° m/s = 24.5 m/s

vᵧ = 0 m/s

aᵧ = -9.8 m/s²

Find: Δy

vᵧ² = v₀ᵧ² + 2aᵧΔy

(0 m/s)² = (24.5 m/s)² + 2 (-9.8 m/s²) Δy

Δy = 30.7 m

(b) The target is at the height from which the arrow was shot. How far away is it?

Given:

Δy = 0 m

v₀ᵧ = 54 sin 27.0° m/s = 24.5 m/s

aᵧ = -9.8 m/s²

Find: t

Δy = v₀ᵧ t + ½ aᵧt²

0 m = (24.5 m/s) t + ½ (-9.8 m/s²) t²

t = 5.00 s

Given:

v₀ₓ = 54 cos 27.0° m/s = 48.1 m/s

aₓ = 0 m/s²

t = 5.00 s

Find: Δx

Δx = v₀ₓ t + ½ aₓt²

Δx = (48.1 m/s) (5.00 s) + ½ (0 m/s²) (5.00 s)²

Δx = 241 m

Answer:

4.2 km

Explanation:

CAR A(velocity =20m/s to East)

In 1s, it covers 20m.

In 120s(2min),it covers20*120m.=2400m=2.4 km

CAR B(velocity =15m/s to west)

In 1s, it covers 15m.

In 120s, it covers 15*120m.=1800m=1.8km

Now, distance between the two cars after 2 minutes =2.4 km+1.8 km=4.2km

Answer:

They pass after roughly 5 hours and 35 minutes.