Pls help I am very confused science

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:

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:

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

a scientific LAW is the answer

Explanation:

a scientific law is the rule that nature runs by.

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 ✌️

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:

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: 5 = straight, constant

Answer: 6 = unbalanced, velocity

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:

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.

Complete Question

The frictional force of moving Toyota Prius was given as  - 259.7 N. net force was 795 N and determined the force of the engine needed to cause the acceleration

Answer:

The value is [tex]F_e = 1054.7 \ N[/tex]  

Explanation:

From the question we are told that

   The frictional force is  [tex]F_f = -259.7 \ N[/tex]

   The net force is  [tex]F_{net} = 795 \ N[/tex]

Generally the net force is mathematically represented as

     [tex]F_{net} = F_e - F_f[/tex]

=>   [tex]F_e = F_{net} - F_f[/tex]

=> [tex]F_e = 795 - [-259.7][/tex]

=> [tex]F_e = 1054.7 \ N[/tex]    

Answer:

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

Explanation:

Answer:

A

,

alll true

Explanation:

If two objects crash into each other, they experience collision and both bodies are affected.

Two bodies are said to collide if they hit or crash into each other.

Hence when two objects crash into each other;

For example, two rolling objects going in opposite directions when they hit each other tens to experience a collision.

Hence we can conclude that if two objects crash into each other, they experience collision and both bodies are affected.

Learn more here: https://brainly.com/question/20424486

Answer:

Two other pennies will be launched, resting only 3 pennies left.

Explanation:

Take "o" as a pennie.

ooo    oo

ooo ← oo

ooooo

oo ← ooo

The process is very similar to what occurs with the pendulum of newton by the law or principle of energy conservation.

In physics, the law or principle of energy conservation states that the total amount of energy in an isolated system remains constant. Such a principle is closely linked to the very definition of energy. An informal way of enunciating this law is to say that energy cannot be created or destroyed: energy can only be transformed from one type to another. The energy from the two pennies will be transferred to the other two pennies from the edge, the energy is then transformed into a kinetic move again.

Answer:

120 m

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

Answer:

The voltage drop across the unknown resistor is 6 volts.

Explanation:

Given;

the current flowing in the series circuit, I = 1.5 A

number of batteries in the series circuit, = 3

voltage in each battery = 9V

total voltage in the circuit, 3 x 9V = 27 V

number of resistor in the circuit, = 4

R₁ = 3 ohms

R₂ = 6 ohms

R₃ = ?

R₄ = 5 ohms

Determine the total resistance in the circuit by applying Ohms law;

V = IR

R = V / I

R = 27 / 1.5

R = 18 ohms

Determine the unknown resistance;

R₁ + R₂ + R₃ + R₄ = 18 ohms

3 + 6 + R₃  + 5 = 18

R₃ = 18 - 14

R₃  = 4 ohms

The voltage drop across the unknown resistor (R₃  = 4 ohms);

V₃ = IR₃

V₃ = 1.5 x 4

V₃ = 6 volts.

Therefore, the voltage drop across the unknown resistor is 6 volts.

Answer:what?????

Explanation:hhisb

Answer:

2480km

Explanation:

Answer:

12.4m/s²; 80.99m

Explanation:

Acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time. Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.

Mathematically, acceleration is given by the equation;

[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]

Given the following data;

Initial velocity = 19.5m/s

Final velocity = 50.1m/s

Time = 2.47 secs

Substituting into the equation;

[tex]a = \frac{50.1 - 19.5}{2.47}[/tex]

[tex]a = \frac{30.6}{2.47}[/tex]

Acceleration, a = 12.4m/s²

Solving for the distance covered;

[tex] S = ut + \frac {1}{2}at^{2}[/tex]

Substituting into the values into the equation;

[tex] S = 19.5(2.47) + \frac {1}{2}(12.4)(2.47)^{2}[/tex]

[tex] S = 48.165 + 6.2 *6.1009[/tex]

[tex] S = 48.165 + 32.8256[/tex]

S = 80.99m

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

Explanation:ik this

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:

A) [tex]\frac{P}{p} + \frac{1}{2} v^2 + gh = k\\[/tex]

B )  53.9 kN/m^2

Explanation:

a) Bernoulli's equation and continuity equation  for a pipe flow

[tex]\frac{P}{p} + \frac{1}{2} v^2 + gh = k[/tex]

[tex]\frac{P}{p}[/tex]  = pressure head

[tex]\frac{1}{2}v^2[/tex] = velocity head

gh = potential head

k = constant

p = density

b) determine the air pressure that must be maintained

Given data :

Discharge rate( R ) = 20 liters/sec ≈ 0.02 m^3

Bore diameter ( d ) = 0.06 m

first we calculate the velocity in the 6 cm  bore

v = [tex]\frac{R }{\frac{\pi }{4} *d^2}[/tex]   ------- (2)

R = 0.02

d = 0.06

insert the given values into equation 2

V = 7.07 m/s

next we apply the Bernoulli's equation by rewriting it as follows

[tex]\frac{P}{pg} + \frac{1}{2g} v^2 + h = k[/tex]

[tex]\frac{1}{2g}v^2[/tex] ( velocity head ) = [tex]\frac{7.07^2}{2*9.81}[/tex]  = 2.55

next  we will apply the use of energy conservation law on the surface of water  in tank and that on the roof :

Note : H1(frictional head loss ) = 45cm = 0.45 m , g = 9.81

applying the energy conservation  law

[tex]\frac{P1}{pg} + \frac{1}{2g} v_{1} ^2 + h1 =[/tex] [tex]\frac{P2}{pg} + \frac{1}{2g} v_{2} ^2 + h2[/tex]

[tex]\frac{P1}{pg}[/tex]  = 0 + 2.55  + 2.5 + 0.45

therefore ; P1 = 9.81 * 5.55 = 53.9 kN/m^2