Guys this is urgent and I don’t know please help me I will mark brainliest!

Have a good day/night!!!

Answer:

The average velocity is 4 [tex]\frac{km}{hour}[/tex]

Explanation:

Velocity is the magnitude that relates the change in position with time. That is, the speed expresses the relationship between the space traveled by an object and the time used for it.

The average velocity relates the change in position with the time taken to effect said change through the expression:

[tex]velocity=\frac{distance}{time}[/tex]

In this case:

Replacing:

[tex]velocity=\frac{12 km}{3 hours}[/tex]

Solving:

velocity= 4 [tex]\frac{km}{hour}[/tex]

The average velocity is 4 [tex]\frac{km}{hour}[/tex]

Answer:

Both Electrical and Magnetic Forces take place between two charged objects

Explanation:

Answer:

YES. 6√10

Explanation:

apply E=1/2mv^2 and find the velocity of carriage which is 6√10 ms-1

as our velocity is higher than that of cart. we can catch the carriage

Answer:

9.1km/hr...................I think I'm not %100

Answer:

False. They can’t change the charge but they can change the mass

Answer: The truck's velocity after braking = 17m/s.

Explanation:

Given: Initial velocity(i) = 25 m/s

Time(t)  = 4s

Acceleration(a) = -2 m/s ²

We use the following formula to compute final velocity (v):

[tex]v= i+at\\\\\Rightarrow\ v=25+(-2)(4\ \ \ [\text{Substitute all values}]\\\\\Rightarrow\ v=25-8\\\\\Rightarrow\ v=17\ m/s[/tex]

Hence, the truck's velocity after braking = 17m/s.

Answer:

Explanation:

Due to heat energy , metal expands . Formula for linear expansion is as follows .

L = l ( 1 + α Δt )

where L is expanded length , l is original length , α is coefficient of linear expansion and Δt is increase in temperature .

To pass the sphere through the ring , the diameter of both ring and sphere should be same after heating . Let after increase of temperature Δt , their diameter becomes same as L  . The linear coefficient of brass and steel are

20 x 10⁻⁶ and 12 x 10⁻⁶ respectively .

For steel sphere ,

L = 25 ( 1 + 12 x 10⁻⁶ Δt )

For brass ring

L = 24.9 ( 1 + 20 x 10⁻⁶ Δt )

25 ( 1 + 12 x 10⁻⁶ Δt ) = 24.9 ( 1 + 20 x 10⁻⁶ Δt )

1.004( 1 + 12 x 10⁻⁶ Δt ) =  ( 1 + 20 x 10⁻⁶ Δt )

1.004 + 12.0482 x 10⁻⁶ Δt  =   1 + 20 x 10⁻⁶ Δt

.004 = 7.9518 x 10⁻⁶ Δt

Δt  = 4000 / 7.9518

= 503⁰C.

final temp = 503 + 15 = 518⁰C  .

Answer:

Her displacement is 10km

Explanation:

An illustrative diagram for the journey is shown in the attachment below.

From the question,

She travels north 5km, which is given by /AB/ in the diagram, and 10km west, which is given by /BC/ in the diagram. She then travels 5km south, which is given by /CD/ in the diagram. To determine her displacement,

Displacement is the shortest distance from an initial position to a final position.

Therefore, her displacement is given by /DA/ in the diagram.

NOTE: /DA/ = /BC/ (Opposite sides of a rectangle)

Since /BC/ = 10km

∴ /DA/ = 10km

Hence, her displacement is 10km.

Answer:

27J  

3528J

Explanation:

First problem:

Given parameters:

Mass of tennis ball  = 0.06kg

Velocity of tennis ball  = 30m/s

Unknown:

Kinetic energy  = ?

Solution:

Kinetic energy is the energy due to the motion of a body.

It is expressed as:

       K.E  = [tex]\frac{1}{2}[/tex] m v²  

       K.E =  [tex]\frac{1}{2}[/tex]  x 0.06 x 30²   = 27J  

Second problem:

Given parameters:

Mass = 30kg

Height  = 12m

Unknown:

Potential energy  = ?

Solution:

Potential energy is the energy due to the position of a body.

  Mathematically;

       Potential energy  = mgh

m is the mass

g is the acceleration due to gravity

h is the height

 Now;

          Potential energy  = 30 x 9.8 x 12  = 3528J

Answer:

dsadadas

Explanation:

dadadda

Answer:

W = 83 [N] (weight)

Explanation:

We must clarify that the system is in static equilibrium, in such a way that we must perform a sum of forces on the Y-axis equal to zero, in order to determine the downward force corresponding to the weight of the child.

∑Fy = 0

[tex]F_{1}+F_{2}-m*g=0\\18+65=m*g\\m*g = 83 [N][/tex]

And the mass can be determined as follows:

[tex]m*g=83\\m = 83/9.81\\m=8.46[kg][/tex]

The weight of the child is equal to 83 Newton.

Given the following data:

To determine the weight of the child:

From the diagram, we can deduce that the system is in static equilibrium. Thus, we would resolve the horizontal component of the forces, in order to determine the downward force (weight of child).

Mathematically, the horizontal component of the forces is given by:

[tex]\sum F_y = 0\\\\F_1 +F_2 -mg=0[/tex]

Substituting the given parameters into the formula, we have;

[tex]18+65-mg=0\\\\83=mg[/tex]

Note: Weight = mg

Weight of child = 83 Newton.

Read more: https://brainly.com/question/366299

Answer:

[tex]5.241\ \text{m/s}[/tex]

Explanation:

m = Masa del coche

g = Aceleración debida a la gravedad = [tex]9.81\ \text{m/s}^2[/tex]

h = Altura = [tex]1.4\ \text{m}[/tex]

v = Velocidad del automóvil en la parte inferior de la pista

Aquí asumimos que el automóvil desciende verticalmente. La energía potencial del automóvil se completará convertida en energía cinética en la parte inferior de la pista ya que no hay pérdida de energía.

[tex]mgh=\dfrac{1}{2}mv^2\\\Rightarrow v=\sqrt{2gh}\\\Rightarrow v=\sqrt{2\times 9.81\times 1.4}\\\Rightarrow v=5.241\ \text{m/s}[/tex]

La velocidad máxima que puede alcanzar el coche es [tex]5.241\ \text{m/s}[/tex].

Answer:

Power = 0.33 Watts

Explanation:

Given the following data;

Distance = 1m

Force = 20N

First of all, we would solve for the work done by the boy.

Workdone = force * distance

Substituting into the equation, we have;

Workdone = 20*1 = 20J

Now to find power;

Power = workdone/time

Power = 20/60

Power = 0.33 Watts.

Answer:

im going to guess the 3rd one

Explanation:

Answer:  0.6

Explanation: I'm doing the projectile motion problem solving and I was stuck but I guessed and choose that answer and it said I was correct.

Answer:

1) e

2)c

3)b

4)d

i dont know if these are right, but something along these lines if you understand the pattern

Explanation:

Answer:

43.83 nC

Explanation:

We know Q = ε₀Ψ where Q = charge enclosed by the cubic box,  ε₀ = permittivity of free space = 8.854 × 10⁻¹² F/m and Ψ = net electric flux through cubic box = 4950 Nm²/C

So, substituting the values of the variables into the equation, we have

Q = ε₀Ψ

= 8.854 × 10⁻¹² F/m × 4950 Nm²/C

= 43827.3 × 10⁻¹² C = 4.38273 × 10⁻⁸ C

= 43.8273 × 10⁻⁹ C

= 43.8273 nC

≅ 43.83 nC

Answer:

1.Siddartha Gautama

2.no single founder

3jesus christ

4.muhammad

5.abraham

Answer:

At 2km/h*s it is changing speed every 2 seconds.

At 4km/h*s it is changing speed every 4 seconds.

At 10km/h*s it is changing speed every 10 seconds.

Answer:

B) a leaf blown from a tree by the wind

Answer:

the answer is B A leaf being blown from a tree by the ground

Answer:

[tex]F_r \approx 978.3N[/tex]

[tex]\theta =44 \textdegree[/tex]

Explanation:

From the question we are told that

Connie pulls with a force of [tex]F_c=200 N[/tex]

At an angle [tex]\theta _c=20 \textdegree[/tex]

Randolph pulls with a force of [tex]F_R=800 N[/tex]

At an angle [tex]\theta _R=50 \textdegree[/tex]

Generally the horizontal axis  can mathematically be represented as

[tex]f_x=f_ccos\theta _c+F_Rcos\theta _R[/tex]

[tex]f_x=200*cos20+800*cos50[/tex]

[tex]f_x=702.2N[/tex]

Generally the vertical axis  can mathematically be represented as

[tex]f_y=f_csin\theta _c+F_Rsin\theta _R[/tex]

[tex]f_y=200*sin20+800*sin50[/tex]

[tex]f_y=681.24N[/tex]

Generally the resultant force [tex]F_r[/tex] is mathematically  given by

[tex]F_r=\sqrt{f_x^2+f_y^2}[/tex]

[tex]F_r=\sqrt{702.1686119^2+681.2395832^2}[/tex]

[tex]F_r=978.3230731N[/tex]

[tex]F_r \approx 978.3N[/tex]

Generally the Direction [tex]\theta[/tex] of force is mathematically given by

[tex]\theta =tan^-^1(\frac{f_c}{f_y})[/tex]

[tex]\theta =tan^-^1(\frac{681.23}{702.16})[/tex]

[tex]\theta =44 \textdegree[/tex]

Answer:

alam ko sagot pero mataas

Answer:

a = 1.32 [m/s²]

Explanation:

To calculate this problem we can use the following equation of kinematics.

[tex]v_{f}=v_{o}+a*t[/tex]

where:

Vf = final velocity = 7.2 [m/s]

Vo = initial velocity = 3.5 [m/s]

t = time = 2.8 [s]

a = acceleration [m/s²]

[tex]7.2=3.5+a*2.8\\2.8*a=3.7\\a=1.32[m/s^{2} ][/tex]

Answer:

37.5m/s

Explanation:

momentum = mass x velocity

momentum / mass = velocity = speed

75kg*m/s / 2kg = 37.5m/s

Answer:

If they put their hands near their neck, if they're not breathing properly, if they aren't coughing.

Explanation:

Answer:

if they are struggling to breathe, attempting to cough (like coughing something up) or asking for help whilst holding their stomach, neck

Answer: 10

Explanation:

Answer:

The frequency of a wave whose time period is 0.002 second is 500 Hz

Explanation:

Given,

Time period of wave = 0.002 seconds

We know,

Frequency = 1 / Time period

Substituting the values;

= 1 / 0.002sec

= 1000/2

Frequency =  500Hz

Hence,

The frequency of a wave whose time period is 0.002 second is 500 Hz