Công thức tính gia tốc hướng tâm trong chuyển động tròn đều
a. aht = v2/R. B. aht = v2R. C. aht = 2R. C. aht = 42f2/R.

Answers

Answer 1

Answer:

I am really sorry but I can't understand the question.

Can you translate the question to English?

Explanation:


Related Questions

Trong chân không khi hai điện tích cách nhau lần lượt là d và d+10cm thì lực tương tác điện giữa chúng có độ lớn tương ứng là 2.0-6 N và 5.10-7 N tính giá trị của d

Answers

Answer:

H2O is also known as for water

You place a small sphere with a net charge of 5 space x space 10 to the power of negative 6 end exponent space C at one corner of a square that measures 5 m on each side. What is the magnitude of the electric field at the opposite corner of the square?

900 N/C


9,000 N/C


450 N/C


4,500 N/C​

Answers

450n/c

(Sorry if this didn’t help)

Make a
claim about whether a mixture could be made
up of only elements and no compounds.
Summarize evidence to support the claim and
explain your reasoning.

Answers

Answer:

Yes, a mixture can be made up of just elements and no compounds. The elements never experiance a chemical interaction and stay only in physical contact with each other.

BRAILIEST PLS I NEED LEVEL UP!

9. A car of 1200 kg is rolling down a hill. When the car reaches a momentum of 7800 kg
m/s, what is its velocity?

Answers

Answer:

V = p/m = 7800/1200 = 6.5m/s

Explanation:

if temperature is constant, the relationship between pressure and volume is

Answers

Answer: inversely proportional

Explanation:

A plane is flying through the sky at a constant speed. The thrust of the aeroplane (making it go forwards) is 100N. Air resistance is also acting on the plane. What must the resultant (overall) force be on the plane?

A: 0N
B: 50N
C: 100N
D: 150N

Answers

Answer: 0N

Explanation: Hope this helps :)

last time i wrote the wrong answer for the wrong problem :)

For the constant speed, the resultant force on the plane is 0N. So, the correct option is A.

What is Force?

A force is defined as the parameter that can change the momentum of an object that can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or pull where force has both magnitude and direction, making it a vector quantity.

For above given information, the plane is moving at a constant speed. According to Newton's first law, the net external force on the aircraft due to the thrust generated by the propeller must be zero and air resistance is equal and in opposite directions to produce zero net force.

Thus, for the constant speed, the resultant force on the plane is 0N. So, the correct option is A.

Learn more about Force, here:

https://brainly.com/question/26115859

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Are these pictures below an example of reflection or refraction?

Answers

Refraction because the light is being altered (bending) and appearing in a different way (direction). Reflection is like a mirror

Answer:

Refraction

Explanation:

Reflection involves a change in direction of waves when they bounce off a barrier.

Refraction of waves involves a change in the direction of waves as they pass from one medium to another.

Please mark as brainliest if this helps! :)

why does an elliptical galaxy look like one giant star

Answers

Explanation: An Elliptical galaxy looks like one giant star because the stars in the elliptical galaxy are often close together, making the center seem to be one giant star.

Hope this helps

Highest common factor of 12r and 10

Answers

I think the number 2, not sure

the weight of a box having of 100 kg is __n

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Answer:

mom                                                                                                

Explanation:

The Sankey diagrams below show the energy transfers in two light bulbs. What is the efficiency of light bulb 2? Give your answer to the nearest 0.5 percent

Answers

Answer:

Divide the useful energy by the total energy and you will get the efficiency which should be between 0 and 1. Multiply by 100 to find the percentage efficiency.

Explanation:

How do you find out the missing masses in a balloon

Answers

Answer:

How do you find out the missing masses in a balloon?

Well, actually you can't find the missing masses in a balloon. Why?

Because the mass of the mass of balloon, it can't see the mass of it, it only see if it the balloon is deflated or inflated.

Explanation:

Hope it helps

#LetsStudy

Look at the circuit below. What is the potential difference across lamp 2?

Answers

The potential difference across lamp #2 is 4.5 volts.

A rock is thrown upward with a speed of 2.0m/s.
a. How long will it take the rock to reach the peak?
b. What is the maximum height it can reach?

Answers

Hi there!

(A)

When the rock reaches the peak, it will have a vertical velocity of 0 m/s. We can use the equation:

vf = vi + at

vf = final velocity (0 m/s)

vi = initial velocity (2 m/s)

a = acceleration (in this situation, due to gravity = 9.8 m/s²)

t = time (s)

0 = 2 + (-9.8)t

2/9.8 = t = .204 sec

(B)

Use the equation:

d = vit + 1/2at²

d = 2(.204) + 1/2(-9.8)(.204²)

d = .204 m


Could someone please help me

Answers

Answer:

the size of the shadow will be smaller due to smaller hands

Lichens are not single organisms, but algae and fungi that function together. The algae use photosynthesis to make food for both organisms. The fungi produce digestive chemicals and absorb nutrients for both organisms. How does the biological activity of lichens cause weathering in rocks? Answer options with 4 options A. Lichens cause friction as they grow, which weathers the rocks. B. Lichens produce chemicals, which dissolve and weather the rocks. C. Lichens take in water, which freezes in cracks and weathers the rocks. D. Lichens absorb heat during photosynthesis, which weathers the rocks.

Answers

Answer:

The correct answer is B

Lichens produce chemicals which dissolve and weather the rocks.

an amusement park ride has two identical carriages that revolve around the center of the ride’s axle, as shown in the figure. both carts travel at a constant tangential speed at all points along the circular path. at what position is the total mechanical energy of the cart-cart-earth system at its maximum value?

Answers

The principle of conservation of energy allows to find the result for the mechanical energy of the system is:

Mechanical energy is conserved at all points, therefore at all points it has the same value.

Mechanical energy is defined by the sum of the kinetic energy and the potential energies.

            Em = K + U

In the principle of energy conservation, it establishes that energy cannot be created or destroyed, it is only transformed, in the case of no friction, mechanized energy is conserved at all points.

They indicate that the system is rotating, which is why it is subjected to a force that expends its energy in changing the direction of the speed to keep the system in rotation, so the speed of the system remains constant.

          Em = K = ½ I w²

Consequently, using the principle of conservation of energy we can find the result for the mechanical energy of the system is:

Mechanical energy is conserved at all points, therefore at all points it has the same value.

Learn more here: brainly.com/question/1517221

Tell me in simple words what gravitation is.

Answers

Answer:

The movement, or a tendency to move, toward a center of gravity, as in the falling of bodies to the earth is called gravitation

A roller is pushed with a force of 100 N along its handle, which is at an angle of 60 degrees with the horizontal. Find the work done in moving it through 20 m?

Answers

Answer:

1 kJ

Explanation:

By definition of work, [tex]W = \vec F \cdot \vec x = |\vec F| |\vec x| cos\angle Fx[/tex]. Let's replace the values: [tex]W = 100N\cdot 20m \cdot cos 60 = 1000 J[/tex]

Determine the force required to move a block if the coefficient of static friction of one block and the floor is 0.35 and the coefficient of the static friction between 2 boxes is 0.25

Answers

Answer:

32.5

Explanation:

Choose the normal force acting between the object and the ground. Let's assume a normal force of 250 N .

Determine the friction coefficient. ...

Multiply these values by each other: (250 N) * 0.13 = 32.5 N .

You just found the force of friction!

Solve the science problem

Answers

Answer:

What is the problem I cant help unless you have the problem.

Explanation:

Answer:

what is the science problem??

NEED HELP!!! ANSWER THESE 5 QUESTIONS FOR 25 POINTS!!!! PLEASE ANSWER!! I WILL GIVE YOU BRAINEST

1. Jerome explains to his doctor that because he spends a lot of time at his desk, he makes sure that his chair supports good posture. But when he is home, he spends his time on an old, squishy couch that offers very little support. He figures that since he spends most of his time at work, he does not need to worry about his home furniture as much. How would Jerome’s doctor MOST likely reply?
A.
Jerome’s thinking is correct since he spends most of his time at work.
B.
Jerome should bring his chair from work home with him on the weekend.
C.
If Jerome’s standing posture is good, he does not have to worry about his seated posture.
D.
Sitting properly is important in all contexts, so Jerome should consider his seating at home.

2. Guillermo has decided that he wants to be healthier, so he starts jogging. He has been at it for a week, but he is getting frustrated because he cannot run very far without getting out of breath. He is beginning to think that this is not a good exercise for him since he is not very good at it. What BEST explains why Guillermo is struggling?
A.
He probably does not have good form when he is exercising.
B.
He likely has heart or lung problems that he was not aware of.
C.
He does not have much endurance since he is new to exercise.
D.
He is just not good at jogging and needs to try something else.

3. Which is the BEST example of the kind of mechanics that are studied in sports biometrics?
A.
the average attendance at a sporting event
B.
how a new sport becomes popular in a community
C.
the movement of the wrist when hitting a tennis ball
D.
the median height of the most successful hockey goalies

4. Ewan had a resting heart rate of about 110. What does this indicate?
A.
His heart rate is perfectly average.
B.
He probably has a high metabolism.
C.
He needs to work on raising his resting heart rate.
D.
His heart rate is high and could indicate a problem.

5. Why is acceptance an important part of building a healthy lifestyle?
A.
Exercise will probably not change much in your life.
B.
Healthy lifestyles often create a lot of disappointment.
C.
If you understand your limitations, you are less likely to be frustrated.
D.
Finding the energy to exercise can be hard, so you should limit your goals.

PLEASE NO LINKS

Answers

1. D
2. C
3. C
4. D
5. D
•••••••••••••••••••••••••••••••••••••••••••••••••
I really hope this helps! These answers are the most reasonable.

An athlete spins in a circle and throws a 1.6-kg discus. The radius of the discus's path is 1.0 m, and he releases it with an angular speed of 15.0 rad/s. The athlete spins for a total of 1.2 s before releasing the discus.
– What is the tangential speed of the discus at release?
– What is the centripetal acceleration of the discus?
– What is the centripetal force on the discus?

giving Brainliest for full and proper answers! thank you for anyone who tries to help/explain :)

Answers

(a) The tangential speed of the discus at the release is 15 m/s.

(b) The centripetal acceleration of the discus is 225 m/s².

(c) The centripetal force on the discus is 360 N.

The given parameters;

mass of the discus, m = 1.6 kgradius of the path, r = 1 mangular speed, ω = 15 rad/stime of motion, t = 1.2 s

The tangential speed of the discus at the release is calculated as follows;

[tex]v = \omega r\\\\v = 15 \ rad/s \ \times 1 \ m\\\\v = 15 \ m/s[/tex]

The centripetal acceleration of the discus is calculated as follows;

[tex]a_c = \frac{v^2}{r} \\\\a_c = \frac{15^2}{1} \\\\a _c = 225 \ m/s^2[/tex]

The centripetal force on the discus is calculated as follows;

[tex]F_c = ma_c\\\\F_c = 1.6 \times 225\\\\F_c = 360 \ N[/tex]

Learn more here:https://brainly.com/question/11700262

A chemical lab isolates a gaseous element from the atmosphere that does not form chemical compounds. In which group of the periodic table is this element most likely found?

A. 18

B. 17

C. 1

D. 2​

Answers

Answer:

A- 18

Explanation:

It wont let me explain how

a Name the store of energy when you are
pressing downwards on the stretchy skin
of the trampoline

Answers

Kinetic energy is stored when you are pressing downwards in a trampoline

What is the net force needed to accelerate a 1 kg textbook with an acceleration of
4 m/s2

Answers

Answer:

4 N

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question

mass = 1 kg

acceleration = 4 m/s²

We have

force = 1 × 4 = 4

We have the final answer as

4 N

Hope this helps you

How are particles in liquids, solids, and gases the same? How are they different?

Answers

Answer:

Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. ... gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.

Explanation:

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A race car traveling at 10 meters per second accelerates at a rate of 1.5 meters per second squared while travelling a distance of 600 meters. The final speed of the race car is approximately

Answers

Answer: 44m/s

Explanation:

Which vehicle will have more kinetic energy, a parked
semitruck or a car moving at 50 km/h?

Answers

Answer:

a semi truck

Explanation:

Describe what it means to view something from a frame of reference.Give an example to illustrate your explanation.

Answers

like just try and try you gut it just trust me I'm a Wuman and you a man

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