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Which statement about polymers is true?
A. Polymers are substances that have relatively large molecules.
B. Oil and gas are the starting materials for making all polymers.
C. Fabrics such as cotton and silk are synthetic polymers.
D. All polymers are obtained from living organisms.

Answer: 5 = straight, constant

Answer: 6 = unbalanced, velocity

Answer:

Yes

Explanation:

Answer:

Yes

Explanation:

friction: the resistance that one surface or object encounters when moving over another.

Answer:

The spring coils and the air participles both move in the same direction as the wave travel

Answer:

50 km/h

Explanation:

d = 100km

t = 2 hours

average speed = total distance/total time

= 100/2  = 50 km/h

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Answer:

2480km

Explanation:

Answer:

The new speed is [tex]V_r = 443.4 \ m/s[/tex] , in the direction  [tex]\theta = 14.36^o[/tex] with respect to the ground

Explanation:

From the question we are told that

   The initial speed of the jet airliner is 366 mph to the east (positive x - axis )

    The direction of the wind is  [tex]u = 127 \ mps[/tex] toward  60° north west

     Generally the  x component of jet airliner velocity is  

             [tex]v_x = 366 * cos (0) = 366 \ mph[/tex]

      Generally the  y component of jet airliner velocity is

              [tex]v_y = 366 * sin (0) = 0 \ mph[/tex]

       Generally the  x component of winds velocity is  

              [tex]u_x = 127 cos(60) = 63.5 \ m/s[/tex]

        Generally the y component of winds velocity is

              [tex]u_x = 127 sin(60) = 109.99 \ m/s[/tex]

Generally the velocity of both the jet airliner and wind along the x-axis is

        [tex]V_x = v_x + u_x = 366 + 63.5 = 429.5 \ m/s[/tex]

Generally the velocity of both the jet airliner and wind along the y-axis is

        [tex]V_y = v_y + u_y = 0 + 109.99 = 109.99 \ m/s[/tex]

Generally the resultant velocity is  

          [tex]V_r = \sqrt{V_x^2 + V_y^2}[/tex]

=>       [tex]V_r = \sqrt{429.5^2 + 109.99^2}[/tex]

=>       [tex]V_r = 443.4 \ m/s[/tex]

 The direction is  

         [tex]\theta = tan^{-1} [\frac{V_y}{V_x}][/tex]

=>      [tex]\theta = tan ^{-1}[\frac{109.99}{429.5}][/tex]

=>    [tex]\theta = 14.36^o[/tex]

Answer:

120 m

Explanation:

Answer:

400 V

Explanation:

The following data were obtained from the question:

Current in secondary coil (Iₛ) = 1 A

Current in primary coil (Iₚ) = 0.5 A

Emf in secondary coil (Eₛ) = 200 V

Emf in primary coil (Eₚ) =.?

The voltage (i.e emf) in the primary coil can be obtained as illustrated below:

Eₛ / Eₚ = Iₚ / Iₛ

200/Eₚ = 0.5/1

Cross multiply

Eₚ × 0.5 = 200 × 1

Eₚ × 0.5 = 200

Divide both side by 0.5

Eₚ = 200/0.5

Eₚ = 400 V

Therefore, the voltage in the primary coil is 400 V

Answer:

I believe that the doctor or your parent should handle STDs talk because the doctor could tell you your risk of getting STDs or your parent could keep you safe and be prepare.They should be the one to tell you the important of being safe and protected not your PE teacher or anyone else. They will understand your choice but don't talk about your personal life with your teacher .Your parent are the best choice to talk to about STDs.

Explanation:

Answer:what?????

Explanation:hhisb

Answer:

1.8 secs

Explanation:

u= 0

v= 18m/s^2

t= ?

v= u +at

18= 0 + 10×t

18= 10t

t= 18/10

t= 1.8 secs

Hence it will take the ball 1.8 secs to reach the ground

Answer:

coal

Explanation:

Frank Schuman's solar power invention to create steam that will drive the turbine to generate electricity was not accepted in the United State back then because coal, a non-renewable energy source, was available for cheap and can easily be burned to generate steam.

Since the coal was readily available for cheap and back then, the deposit was huge to the extent that no one was thinking that it could get exhausted one day or the environmental pollution created through its burning, the invention of Schuman did not get the desired attention.

Answer:

a) F = 250 [N]

Explanation:

Force can be calculated by means of Newton's second law, which tells us that force is the product of mass by acceleration.

a)

F = m*a

where:

F = force [N]

m = mass = 25[kg]

a = gravity acceleration = 10 [m/s²]

F = 25*10 = 250 [N]

Yes, this force would be different on Mars, since the gravitational acceleration of Mars is different from that of Earth.

gm = Martian gravity = 3.72 [m/s²]

Fm = 3.72*25 = 93 [N]

Answer:

Let's define:

M = mass of the person

m = mass of the skateboard.

We can write the momentum as:

P = M*v

Remember the conservation of momentum, as we can not find any force in this situation (a highly idealized situation) the momentum will be conserved.

if P is the momentum before the person rides the skateboard, P' will be the momentum after the person rides the skateboard.

P = M*v

P' = (m + M)*v'

We must have:

P = P'

Now, we can assume that the mass of the skateboard is a lot smaller than the mass of the person, such that:

m  << M

then we can assume:

(m +M) ≈ M

then:

P' = (M + m)*v' ≈ M*v'

And this is equal to P.

M*v' = M*v

Then we must have that:

v' = v

and we know that v = 6m/s

Then v' = 6m/s

The velocity after riding the skateboard will be equal to the velocity before riding it (in this model)

In a more scientific way, the velocity after riding the skateboard will be a bit smaller than the velocity before, and it will depend on the mass of the person and the mass of the skateboard.

Answer: To grow strong seedlings, the light should be placed close to the tray, and raised as the plants grow taller.  The Independent variable of this experiment is the light that enter the plant. The Dependent variable is the height of the plant.

Explanation:

Answer:

3

Explanation:

Its not that hard....

If a chicken runs across the street at a speed of 12 m/s, and the road is 36 meters across, then the chicken takes 3 seconds to cross the road.

Speed is the rate at which an object covers distance. It is the measure of how fast or slow an object is moving relative to a particular reference point.

Speed is usually expressed in units of distance per unit time, such as meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph).

For example, if a car travels a distance of 100 kilometers in 2 hours, then its speed would be:

Speed = Distance / Time = 100 km / 2 hours = 50 km/h

This means that the car is covering a distance of 50 kilometers every hour.

Here in the Question,

To calculate the time it takes for the chicken to cross the road, we can use the formula:

time = distance/speed

where distance is the width of the road, and speed is the velocity of the chicken.

Substituting the given values, we get:

time = 36 meters / 12 m/s

time = 3 seconds

Therefore, it takes the chicken 3 seconds to cross the road.

To learn more about Kinetic Energy click:

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Answer:

hmm do you now how to divide

or no

Explanation:

Answer:

Explanation:

The average speed of an object can be found by using the formula

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

d is the distance

t is the time

We have

[tex]v = \frac{90}{3} \\ [/tex]

We have the final answer as

Hope this helps you

Explanation:

??? i don't really see a question here......

Answer:

A

,

alll true

Explanation:

Answer:

Convert the following units, into SI units without changing their values.

2.5 km

We know that

1 km=1000 m

So, for 2.5 km:

2.5 km=2.5×1000 m

=2500 m

Explanation:

like this you can solve all your question

[tex]hii[/tex]

have a nice day ✌️

Speed = (rate of acceleration) x (time)

Accelerating at 5.5 m/s² for 4 seconds, the car gains (5.5 x 4) = 22 m/s of speed.

If it's actually traveling at 25 m/s at the end of that time, then it must have already been moving at (25 - 22) = 3 m/s when the 4 seconds started.

Answer:

D. Both are used by radio stations to transmit sound.

Explanation:

Answer:

Crystallization is one of the most widely used technologies in chemical industry, and process robustness governs process productivity and economics. In particular, the pharmaceutical and food sectors are utilizing crystallization for optimized separation, purification, and solid form selection.

Answer:radiation is the transfer energy thru heat waves, conduction is direct contact, and convection is through liquid

Explanation:ik this