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marshall27 [118]
3 years ago
8

what happens when tectonic plates move away from each other? A.molten matter cools and sinks towards the core B. lava travels wa

y from the crust and forms the mantle C. molten matter seeps through crust and forms new land D. lava seeps into ground and cracks the ground
Physics
1 answer:
Allisa [31]3 years ago
3 0

Answer:

i would say C

Explanation:

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Find the velocity of the car after 6.9 s if its acceleration is 1.5 m/s² due south.
mars1129 [50]
Velocity is 6.9 x 1.5 = 10.35 m/s due South
7 0
3 years ago
How would i solve these problems, nobody in my class understands and there is a substitute
DiKsa [7]

1) X-component: 568.5 N, Y-component: 511.9 N

2) The horizontal force is 86.6 N and the resulting acceleration is 0.87 m/s^2

Explanation:

1)

In this first part of the problem, we have to resolve the force into its two components, along the x and the y direction.

The two components are given by:

F_x = F cos \theta\\F_y = F sin \theta

where

F = 765 N is the magnitude of the force

\theta=42.0^{\circ} is the angle of the force with the horizontal

Substituting, we find:

  • Horizontal component: F_x = (765)(cos 42.0^{\circ})=568.5 N
  • Vertical component: F_y = (765)(sin 42.0^{\circ})=511.9 N

2)

First of all, we have to find the horizontal component of the pulling force, which is given by

F_x = F cos \theta

where

F = 100 N is the magnitude of the pulling force

\theta=30.0^{\circ} is the direction of the force with the horizontal

Substituting,

F_x = (100)(cos 30^{\circ})=86.6 N

Now we can find the acceleration of the wagon by using Newton's second law:

F_x = ma_x

where

F_x = 86.6 N is the net force in the horizontal direction

m = 100 kg is the mass of the wagon

a_x is the acceleration in the horizontal direction

Solving for a_x, we find

a_x = \frac{F_x}{m}=\frac{86.6}{100}=0.87 m/s^2

Learn more about vector components:

brainly.com/question/2678571

And about Newton's second law:

brainly.com/question/3820012

#LearnwithBrainly

5 0
3 years ago
A platinum wire is used to determine the melting point of indium. The resistance of the platinum wire is 2.000 Ω at 20°C and inc
Molodets [167]

Answer:

The melting point of indium is 157.436 degrees Celsius.

Explanation:

The resistance of the platinum wire, R1 = 2

The temperature at R1 is, T1 = 20 degrees Celsius.

The increased resistance, R2 = 3.072

Let the temperature at 3.072 = T2

Now find the temperature at which the indium starts melting.

We know that α = ( R2 - R1 ) / [ R1 × ( T2 - T1 ) ]

Given, α = 3.9 x 10^-3/ degrees Celsius.

T2- T1   = ( R2 - R1 ) / R1 α

T2 – T1 = (3.072 – 2) / (2 × 3.9 x 10^-3)

T2 – T1 = 137.436

T2 = T1 + 137.436

T2 =  20 + 137.436

T2 = 157.436 degree Celsius

5 0
3 years ago
Un niño de 24 kilogramos se sienta en el punto ap(2,5) y otro de 12kg en el punto bp(8.12)
yanalaym [24]

Answer: the equilibrium point or center of mass is (4, 7.33)


Explanation:


1) Physicial principles:

  • The equilibrium point is the center of mass.
  • Call Xc and Yc the coordinates of the center of mass (Xc, Yc), then:
  • Xc is given by the equation Xc = (m₁X₁ + m₂X₂) / (m₁ + m₂)
  • Yx is given by the equation Yc = (m₁Y₁ + m₂Y₂) / (m₁ + m₂)

2) Data:

  • m₁ = 24 kg
  • X₁ = 2
  • Y₁ = 5
  • m₂ = 12 kg
  • X₂ = 8
  • Y₂ = 12

3) Solution:

  • Xc = (m₁X₁ + m₂X₂) / (m₁ + m₂) = (24×2 + 12×8) / (24 + 12) = 4
  • Yc = (m₁Y₁ + m₂Y₂) / (m₁ + m₂) = (24×5 + 12×12) / (24 + 12) = 7.33

Answer: the equilibrium point or center of mass is (4, 7.33)

5 0
3 years ago
Please help with this question. Question is in the image.​
scoray [572]

Answer:

  1. Average velocity
  2. Average velocity equation
  3. Average speed equation
  4. Displacement
  5. Position
  6. Average Speed
  7. Distance

Explanation:

The term average here is defined as the average of the initial and final quantity.

For example, in the case of speed, the average speed is the sum of initial and final speed by 2.

The velocity of an object is defined as the displacement by time. Whereas speed is expressed as the distance between two successive positions of the body to the time interval it took to travel.

               Velocity,        V = D / t        m/s

                Speed,          s = d /t          m/s          

Velocity is a vector quantity that has a magnitude and direction.

The speed is a scalar quantity having only the magnitude.

At any instant of time, the magnitude of the velocity is always equal to the magnitude of the speed. The magnitude of velocity, |v | = magnitude of speed, |v|. The magnitude is always positive

Similarly, this is the case with displacement and distance.

The position vector is the location of the vector from the origin of the coordinate.

7 0
3 years ago
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