Which best describes why heat pumps are reversible?
O They can heat and cool an indoor space.
O They involve a metal expanding or contracting against another.
They combust and can also add coolant.
They allow a piston to move up and down.

The reason behind circular motion at constant speed is not a natural state of motion is centripetal acceleration acting on it.

Centripetal acceleration is a characteristic of an object's motion along a circular path. Centripetal acceleration applies to any item travelling in a circle with an acceleration vector pointing in the direction of the circle's center.

A natural state of motion is that motion where object moves with constant velocity and no acceleration. As  in circular motion of  an object at constant speed, a constant centripetal acceleration remains, this is not a natural state of motion.

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Answer:

D=m/v

Explanation:

1.37kg/1.3899m cube

0.9927kg meter cube

Answer:

what

Explanation:

Answer:

Element is the answer ok

Answer:

Explanation:

Givens

d= 20 m

vi = 0

vf = 9 m/s

a = ?

Equation

vf^2 = vi^2 + 2 * a * d

Solution

9^2 = 0 + 2*a*20

81 = 2*a * 20

81 = 40*a

a = 81/40

a = 2.025

Answer:

well im not gonna give the full answer but the hint im going to give is tht u can use a calculator

Explanation:

Answer:

joule

Explanation:

hop it helps give a good rate ples

Answer:

joule

Explanation:

Answer:

c) the quantity that opposes inertia

Answer:

Explanation:

Thank you ☺️☺️

Answer:

The cyclist takes 10 seconds to accelerate to 12 m/s.

Explanation:

Constant Acceleration Motion

It's a type of motion in which the velocity of an object changes by an equal amount in every equal period of time.

Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:

[tex]v_f=v_o+at[/tex]

Solving for t:

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

The cyclist starts from rest (vo=0) and moves at vf=12 m/s with an acceleration [tex]a=1.2\ m/s^2[/tex].

Calculate the time:

[tex]\displaystyle t=\frac{12-0}{1.2}[/tex]

[tex]\displaystyle t=\frac{12}{1.2}[/tex]

[tex]\boxed{t=10\ sec}[/tex]

The cyclist takes 10 seconds to accelerate to 12 m/s.

Answer

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Answer:

a ecology

Explanation
L nathaliedog

Answer:

His average speed is through 4-6.

Explanation:

Because if you divide them both by 5 you get 4 and 6.

Answer:

A i think tell me if i got it right

Explanation:

Based on the location on the periodic table, Potassium (K) is the metal that will be less reactive than rubidium and more reactive than calcium.

Answer:52.5

Explanation:

You pull a sled with a package on it across a snow-covered flat lawn. If you apply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. The combined mass of the package and the sled m = 52.50 kg

The given data to find Mass,

The force applied to the sled, F = 65.1 N

Acceleration of the sled, a = 1.24 m/s²

Forces are defined by both strength and direction.

Force is a vector quantity. It is a quantity that is described by Magnitude and Direction. The strength of a force is its magnitude and the direction, well it is the direction the magnitude is applied on the object.

We need to find the combined mass of the package and the sled. Let it is m. Using definition of force as follows :

F = ma

m = F/a

m = 65.1 /1.24

Mass, m = 52.5 Kg.

If you apply a force of 65.1 N to the sled, it accelerates at 1.24 m/s2. The combined mass of the package and the sled m = 52.50 kg

Hence, Option C is the correct answer.

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Answer:

6.6 Meters = 660 Meters

Explanation:

1 Meter = 100 Centimeters

Answer:

0.70+2.4=23.7+35.0=answer

Explanation:

Answer:

First Question:

If the initial velocity is horizontal: It doesn't really matter how fast it is going horizontally if we want to calculate time.

Since it rolled off the table, the initial vertical velocity is 0. The displacement will be -0.7 meters since the table is 0.7 meters high. The acceleration will be -9.8 m/s^2 because that's just earth's gravity.

We can plug the variables into the formula Displacement = Initial Velocity*Time + 1/2*Acceleration*Time^2:

[tex]-0.7 = 0\cdot t + 1/2\cdot-9.8\cdot t^2\\-0.7 = -4.9*t^2\\t^2 = \frac{10}{7} \\t = \sqrt{\frac{10}{7}}[/tex]

Rounded to the nearest hundredths, the answer is 1.2 seconds.

Second Question:

We can use the horizontal variables to find out the time to solve for the vertical velocity.

The acceleration is going to be 0(assuming no air resistance), the initial velocity is going to be 23.7 m/s, and the displacement is going to be 35.0 meters.

Again, we can plug the variables into the formula Displacement = Initial Velocity*Time + 1/2*Acceleration*Time^2:

[tex]35 = 23.7\cdot t + 1/2\cdot 0\cdot t^2\\35 = 23.7\cdot t\\t = \frac{35}{23.7}[/tex]

Rounded to the nearest hundredth, t = 1.48.

Now, we're going to find the vertical variables:

The acceleration will be -9.8 m/s^2 because that's just earth's gravity. The initial velocity will be 0 because the rock was launched horizontally. The time, as calculated before, is 1.48.

Now, we can plug t into the formula Velocity = Initial Velocity + Acceleration *Time:

[tex]v = 0 + -9.8\cdot1.48\\v = -14.504[/tex]

Rounded to the nearest hundredth, the answer is -14.5 meters per second.

Third Question:

Let's find the horizontal variables:

Assuming no air resistance, the final velocity is 205 m/s. The initial velocity will also be 205 m/s. The time will be 6.5 seconds.

We can use the formula Displacement = (Final Velocity+Initial Velocity)/2 * Time. In this case, the final velocity and the initial velocity are the same, so the formula reduces to Displacement = Final Velocity * Time:

[tex]d = 205\cdot6.5\\d = 1332.5[/tex]

Therefore, the answer is 1332 meters.

I really hoped this helped you because I spent more than 1 hour explaining. If you have more questions don't hesitate to ask. If it helped you, please consider giving me brainliest? :)

Answer:

200/67.1224321241 = 2.97962981482 hours to travel 200 miles.

Hope this helps :)

Explanation:

First, convert the speed of the bus back to km/h so it makes things easier. The bus is going at an unreasonably high seed of 108 km/h and will usually result in a crash caused by the driver being unable to control the bus at such high speeds, even it won’t topple over at an inclination of 28 degrees for double decker buses (when the bus is stationary. If the prototypes can’t meet this requirement, the prototype fails the safety test and won’t be used as a bus for carrying passengers).

If you ignore that problem, we will start to do the calculation. 108 km/h is equal to 67.1224321241 mph, so it would take 200/67.1224321241 = 2.97962981482 hours to travel 200 miles.

2.97962981482 hours is equal to 2 hours, 58 minutes, 46 seconds, 667 milliseconds, 333 microseconds and 352 nanoseconds.

Here is the list of descending order of time magnitude of smaller than one second for extra information.

Decisecond = 0.1 second (one tenth)

Centisecond = 0.01 second (one hundredth)

Millisecond = 0.001 second (one thousandth)

Microsecond = 0.000001 second (one millionth)

Nanosecond = 0.000000001 second (one billionth)

Picosecond = 0.000000000001 second (one trillionth)

Femtosecond = 0.000000000000001 second (one quadrillionth)

Attosecond = 0.000000000000000001 second (one quintillionth)

Zeptosecond = 0.000000000000000000001 second (one sextillionth)

Yoctosecond = 0.000000000000000000000001 second (one septillionth)

Planck time = 0.00000000000000000000000000000000000000000001 second

Planck time is the smallest measurable time interval in theory.

Answer:

Music has an important place in our lives.

Answer:

Hysteresis, Eddy current, flux leakage and resistance of winding are those four reasons. It is impossible to overcome this four reasons, Hence transformer never be 100% efficient.

Answer:

Explanation:

To find the distance covered we use the formula

From the question

velocity = 7 m/s

time = 23 s

We have

distance = 7 × 23

We have the final answer as

Hope this helps you

Answer:

rusting is a chemical property because it is irreversible it changes the identity of a substance

Answer:

C. chemical property

Explanation:

a chemical property of iron is that it is capable of combining with oxygen to form iron oxide，the chemical name of rust

Answer:

The ball continued moving in the same direction and its speed increased.

When John kicked the ball, this was an example of motion. The ball's force increased because the ball got force from John's leg. So, the answer is option A.

Hope this helps you!

Answer:

hi !

Pressure = Force/Area

Force = Pressure*Area

Pressure = 25 Pa

Area = 100 cm² = 0.01 m²

F = 25*0.01

   = 0.25 N

Explanation:

Answer:

The Doppler red-shift of light observed from distant stars and galaxies gives evidence that the universe is expanding (moving away from a central point). This allows for Big Bang Theory, because after a “bang” occurs all of the matter moves away from the point of origin.