What is the type of friction force if the object appears just about to start motion?why?

Answer:

the molecules well speed up

Explanation:

Answer: As heat energy is added to the solid, the kinetic energy of the molecules increases and their vibrations speed up. The molecules move farther away from their fixed positions and farther away from each other.

Explanation:

Answer:

initial velocity (u)=0

final velocity (v)=80m/s

time(t)=5s

acceleration (a)=?

Explanation:

we have

v=u+at

80=0+a×5

5a=80

a=80/5=16m/s²

Answer:

The answer is C. Its not on mars and its not 10 football feilds its only 1

The International Space Station was  built from separate parts sent to space.

A sizable spacecraft in orbit orbiting the Earth is called the International Space Station. Crews of astronauts and cosmonauts reside there as a home. The space station serves as an exceptional science lab. The space station was created and used by international cooperation.

The components of the space station were put together by astronauts while they were in space. It travels around 250 miles above Earth's surface on its typical orbit. It has a speed of 17,500 mph. It therefore orbits the planet every 90 minutes. The space station is being used by NASA to learn more about surviving and operating in space. These discoveries will enable sending more people into space than ever before.

For the entire space station, there is no set ownership stake. Instead, each partner should maintain authority and control over the elements it registers and over employees in or on the Space Station who are its nationals, according to Article 5 of the IGA. As a result, only one partner holds sole control of each ISS module. However, the contracts for using the space station's amenities are more intricate.

Learn more about International Space Station here:

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Answer:

-They will be available for many years.

Explanation:

The advantage of using renewable resources is that they will be available for many years.

Renewable resources have very fast turn over time for replenishing, therefore, they are available over an extended period time.

They are not used by consumption and so they will continually be available. This is different from the non-renewable resources which are depleted as they are being used up.

Examples of renewable resources are wind, water and air

Answer:

During winter time the northern hemisphere leans away from the sun due to the rotation of earth and due to this change the sunlight is not direct on these areas instead it is spread and due to this the shadows are longer and the sunlight is not intense. The earths rotation around the sun causes the seasons to change and that is why we experience shorter hours of daytime.

Explanation:

During winter time the northern hemisphere leans away from the sun due to the rotation of earth and due to this change the sunlight is not direct on these areas instead it is spread and due to this the shadows are longer and the sunlight is not intense. The earths rotation around the sun causes the seasons to change and that is why we experience shorter hours of daytime.

Answer:

B

Explanation:

The object with the most thermal energy is the choice B. This is because from the given choices, it has the most mass and highest temperature of all the bricks.

Thermal energy is the sum total of the average kinetic energy within the system.

It is mathematically expressed as:

    Quantity of energy  = mass   x  specific heat x  change in temperature

We see that the quantity of the thermal energy is directly proportional to mass and temperature changes.

Answer:

B. a 4 kg brick at 25 degrees Celsius

Explanation:

did the quiz <3

Answer:

Answer: The answer would be 12.5 m

Answer:

15m/s²

Explanation:

Given parameters:

Initial velocity  = 10m/s

Final velocity  = 40m/s

Time taken  = 2s

Unknown:

Average acceleration  = ?

Solution:

Acceleration is the rate of change of velocity with time;

 Acceleration  = [tex]\frac{Final velocity - Initial velocity }{time}[/tex]  

  Acceleration = [tex]\frac{40 - 10}{2}[/tex]    = 15m/s²

Answer:

45

Explanation:

because the equation for speed is distance divided by time! hope that helps gave a nice day!

The speed of the group of students  is their total  distance divided by the time taken to travel. The speed to cover 90 miles in 2 hours is 45  miles/hour.

Speed is a physical quantity measuring the distance covered by an object within unit time. Speed is a scalar quantity. The rate of speed is called velocity. The unit of both quantities in common is m/s.

If an object covers more distance within small time, the object is said to have a greater speed. The speed of the object is the ratio of its change in distance to the change in time.

Given that, distance covered by the traveler = 90 miles

time taken = 10 -8 = 2 hours

speed = distance/ time

speed =90 miles /2hrs = 45 mph

Therefor, the average speed of the students  is 45 miles per hour.

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Answer:

q₂ = 0.0002 C

Explanation:

Given that,

Charge, q₁ = -0.0005 C

The force between two charges, F = 9 N

The distance between charges, d = 10 m

We need to find the magnitude of the second charge. The force acting between two charges is given by :

[tex]F=\dfrac{kq_1q_2}{r^2}\\\\q_2=\dfrac{Fr^2}{kq_1}\\\\q_2=\dfrac{9\times (10)^2}{9\times 10^9\times 0.0005}\\\\q_2=0.0002\ C[/tex]

So, the magnitude of the second charge is 0.0002 C.

Answer:

D. nine times yesterdays power output

Explanation:

We know that formula for power with work is;

Power = workdone/time taken

Now, you did three times the work in one-third the time yesterday.

This means that;

Work yesterday; W_yesterday = W

Work today; W_today = 3W

Time yesterday; T_yesterday = t

Time today; T_today = t/3

Thus,power today is;

P_today = 3W/(t/3)

P_today = 9(W/t)

Since power output yesterday is W/t, it means you did nine times yesterday's power output.

Answer:

D

Explanation:

Nine times yesterday's power output.

Answer:

i know it i know it pick me

Explanation:

Answer:

nope loser

Explanation:

Mujhe nhi pata sorry. Lekin mai bhut logo ko jaanti hoon jo iss savaal ka jawaab de sakte hai.

Answer:

-5m/s²

Explanation:

Given parameters:

Initial velocity  = 25m/s

Time  = 5s

Final velocity  = 0m/s

Unknown:

Acceleration of the car  = ?

Solution

The acceleration of a body is the rate of change of the velocity of the body with time.

 Acceleration  = [tex]\frac{Final velocity - Initial velocity }{time}[/tex]  

So;

 Acceleration  = [tex]\frac{0 - 25}{5}[/tex]    = -5m/s²

The car is decelerating at a rate of  5m/s²

Answer:

C. It is the result of diffraction

Explanation:

I just took the test

Answer:

C

1.2.5

trust me i just did it

Explanation:

Answer:

evaporation to condensation to precipitation.

Answer:

evaporation to condensation to precipitation.

Explanation:

Answer:

A. 64.0 J

Explanation:

Given parameters:

Spring constant  = 800N/m

Extension  = 0.4m

Unknown:

Work done  = ?

Solution:

The work done in a string is given as:

         Work done  = [tex]\frac{1}{2}[/tex] x 800 x 0.4²   = 64J

Storing music digitally requires less storage room than analog records or tapes. Digital music is easier to copy and the copies are the same as the original. The quality of the signal does not degrade over long periods of time.

Sample Response: Storing music digitally requires less storage room than analog records or tapes. Digital music is easier to copy and the copies are the same as the original. The quality of the signal does not degrade over long periods of time.

Answer:

1: 6.637e-13 N

2: 6.637e-09 N

3: 1.335e-08 N

4: 1.335e-08 N

5: 1.456e-06 N

6: 5.839e-07 N

7: 6.673e-11 N

I'd suggest double checking these if you can.

Explanation:

Each of these you can answer by plugging the numbers into the equation

[tex]F = G\frac{m_1 m_2}{r^2}[/tex]

G is the gravitational constant 6.673×10⁻¹¹ N m² / kg²

So the first one would be:

[tex]F = 6.673 \times 10^{-11} \frac{Nm^2}{kg^2} \times\frac{1kg\times 1kg}{(10m)^2}\\F = 6.673 \times 10^{-11} N \times\frac{1}{100}\\F = 6.673 \times 10^{-13}N[/tex]

I'm not going to run through showing all calculations for the rest, as you're in a rush, so to whip through them

2: 6.637e-09 N

3: 1.335e-08 N

4: 1.335e-08 N

5: 1.456e-06 N

6: 5.839e-07 N

7: 6.673e-11

Pardon the lack of superscript, I just punched these into a python console to calculate them.

Answer:

i think it is A

Explanation

Answer:

Opera seria,

Explanation:

Answer:

Kinetic Energy

Explanation:

Potential Energy is where something is building up energy to move.

Answer:

Kinetic Energy

Explanation:

Answer:

9.81m/s²

Yes, the acceleration is as expected because the diver is falling under gravity

Explanation:

Given parameters:

Mass of skydiver  = 60kg

Gravitational force  = 588.6N

Unknown:

Acceleration of the diver = ?

Solution:

To find the acceleration of the diver, we use the Newton's second law of motion which is expressed as;

          Force  = mass x acceleration

 Acceleration  = [tex]\frac{Force }{mass}[/tex]    = [tex]\frac{588.6}{60}[/tex]    = 9.81m/s²

Yes, the acceleration is as expected because the diver is falling under gravity

Answer:

2800N

Explanation:

Given parameters:

Mass of car   = 1400kg

Acceleration  = 2m/s²

Unknown:

Force on the car  = ?

Solution:

To solve this problem, we use Newton's second law of motion.

        Force  = mass x acceleration

So;

         Force  = 1400 x 2  = 2800N

as we grow up we kinda experience some age staging so a teen got a lotta stuff going on they wanna be social active they be working on their popularity. so i guess thats it

Answer:

The  recoil velocity of the cannon is 2.38 m/s.

Explanation:

Given;

mass of cannonball, m₁ = 8 kg

mass of stationary cannon, m₂ = 1000 kg

initial velocity of the cannonball, u₁ = 300 m/s

initial velocity of the cannon, u₂ = 0

Let the recoil velocity of the cannon, = v

Apply the principle of conservation of linear momentum;

m₁u₁ + m₂u₂ = v(m₁ + m₂)

8(300) + 1000(0) = v(8 + 1000)

2400 = v(1008)

v = 2400/1008

v = 2.38 m/s

Therefore, the  recoil velocity of the cannon is 2.38 m/s.

Answer:

It's 7.2 x 10^10

I got that because I've put that into the calculator

but just transform it into a standard form = 72000000000