The answer answer it it la

Answer:

 v₀ = 11.72 m / s

Explanation:

This is a missile launch exercise. Let's write the relations for the final position

        x = v₀ₓ t

        y = [tex]v_{oy}[/tex] t - ½ g t²

Let's use trigonometry to find the initial velocities

      sin 45 = v_{oy} / v₀

      cos 45 = v₀ₓ / v₀

      v_{oy} = v₀ sin 45

     v₀ˣ = v₀ cos45

we substitute

      x = v₀ cos 45 t

      y = v₀ sin 45 t - ½ g t²

     in this equation system we have two unknowns and two equations for which it can be solved, let's substitute the values

     7 = v₀ 0.707 t

     3.5 = v₀ 0.707 t - ½ 9.8 t²

we clear the time in the first equation and substitute in the second

     3.5 = v₀ 0.707 (7 / v₀ 0.707) - 4.9 (7 / v₀ 0.707) 2

     3.5 = 7 - 480.345 / v₀²

      480.345 / v₀² = 7-3.5

      v₀² = 480.345 / 3.5

      v₀ = √ 137.24

      v₀ = 11.72 m / s

Explanation:

Pressure = force / area

P = 400 N / 0.001 m²

P = 400,000 Pa

Answer:

1A) 3kg * m/s

2D) 100

3, Guess: A smaller change of momentum

4, Guess: A, 1.80

5B) 20

Explanation:

(1)  The total momentum of the balls after collision is 3 kg.m/s

(2) The momentum of the object is 100 kg.m/s

(3) The change in the car's momentum is equal to change in the rock's momentum in opposite direction.

(4) The total momentum of the objects is 0 kg.m/s

(5) The mass of the object is 20 kg.

(1) From the principle of conservation of linear momentum, total initial momentum before collision is equal to the momentum after collision.

initial momentum = final momentum

Thus, the total momentum of the balls after collision is 3 kg.m/s

(2) Linear momentum is defined as the product of mass and linear velocity of an object.

momentum of the object is calculated as;

P = mv

P = 5 x 20

P = 100 kg.m/s

(3) Apply the principle of conservation of linear momentum;

[tex]m_1u_1 + m_2u_2 = m_1v_1 + m_2 v_2[/tex]

In order to ensure that momentum is conserved;

Let u₁ represents the initial velocity of the small rock and u₂ is the initial velocity of the moving car. In this case, the momentum of the car is bigger.

To conserve the momentum, the final velocity of the rock v₁ must be greater than the final velocity of the car. When this happens, the rock will experience a large change in velocity.

From the equation above will have;

[tex]m_1u_1 + m_2u_2 = m_1v_1 + m_2 v_2\\\\m_1u_1 - m_1v_1 = m_2v_2 - m_2u_2\\\\\Delta P_{rock} = \Delta P_{car}[/tex]

Thus, the change in the car's momentum is equal to change in the rock's momentum in opposite direction.

(4) In a closed system the momentum will be conserved;

Initial momentum = final momentum

Total momentum = final momentum  + Initial momentum

The total momentum = 1 x 1.8  +  1 x (-1.8)

Note: the negative sign is because one is moving in opposite direction

The total momentum = 1.8 kg.m/s  - 1.8 kg.m/s = 0 kg.m/s

(5) The mass of the object is calculated as;

[tex]m = \frac{P}{v} \\\\m = \frac{100}{5} \\\\m = 20 \ kg[/tex]

Learn more here:https://brainly.com/question/24424291

Answer:

D = 14.31 m

Explanation:

It is given that,

Displacement due east is 12 m

Displacement due north is 5 m

Displacement in vertically upward direction is 6 m

We need to find the magnitude of the sum of these displacements. We know that, vertically upward, east and north are mutually perpendicular direction. So, the resultant is given by :

[tex]R=\sqrt{12^2+5^2+6^2} \\\\R=\sqrt{144+25+36} \\\\R=14.31\ m[/tex]

So, the magnitude of the sum of these displacements is 14.31 m.

Answer:

inference

Explanation:

took the test hope I helped :p

Answer: 4x²-y²

Explanation:

FORMULA

a²-b²=(a+b)(a-b)

-----------------------------

(a+b)(a-b)=a²-b²

(2x+y)(2x-y)=(2x)²-(y)²

                  =4x²-y²

Hope this helps!! :)

Please let me know if you have any question

Answer:

1 kilometer= 1000 meters

6.8 kilometers= 6800 meters

Explanation:

Answer:

Two non metals

Explanation:

Covalent bonding is a chemical bonding that involves sharing of electrons

a metal and a metalloid can be described as a metallic bond.

a metal and a nonmetal is an example that describes an ionic bonding

While two non metals is a typical example of a covalent bonding.

Therefore, two non metals describes the substances that form covalent bonds

Answer:

C

Explanation:

simple answer

Answer:

Waves: "The phenomenon in which any number of particles or the energy packets that originates from a transmitter  travels in a direction and it is somehow directed towards a receiver end is called as waves."

Electromagnetic wave: The type of waves which do not require any sort of medium for the transformation process of the energy, as it is directed towards from a transmitter towards a receiver.

For example: Radio, IR , Ultra sonic waves etc.

Mechanical waves: The type of waves which requires some medium to transfer the energy packets from one place to another, or from one point to the other using some medium. As the medium can be solids,liquids, or any gaseous forms.

For example: Sound waves, seismic waves etc.

Explanation:

The transfer of energy in Mechanical waves and Electromagnetic waves:

Both, the waves are much different due ones basic requirement of a medium while the other don't require one. As the density of any medium if increased it will increase the speed of the wave propagation. And this any medium being more denser will result in high speed form mechanical waves.

While, the electromagnetic waves can pass through matters or elements easily with out having any obstruction faced in its path because presence of medium is no requirement for the wave propagation.

I hope this helps!!

Answer:

The answer is "4-5-6 because the bank is growing too quickly in the beginning of its turn".

Explanation:

The S-turns is also known as the reference technique, in which the ground track of the aircraft on both sides of a defined ground-based straight-line distance represents 2 different but equivalent circles.  

Throughout the S-turns, on either side of the road, a progressively smaller half-circle is formed, and this turn does not stop until the road or reference line is crossed during the early part of the turn, the twists increase too quickly.

Answer:

A = [kg]

B = [m/s²]

Explanation:

E = ½ Av² + Bmx

Substitute the units:

[J] = ½ A [m/s]² + B [kg] [m]

A Joule written in base units is:

1 J = 1 Nm = 1 kg m²/s²

Each term must have the same units.

[kg m²/s²] = A [m/s]²

[kg m²/s²] = A [m²/s²]

A = [kg]

[kg m²/s²] = B [kg] [m]

B = [m/s²]

Answer:

B. a standing committee

Explanation:

got it right on Edmentum/Plato <3

Answer:

emf = 15 * Area  and if A is given in square meters, the units of the emf will be Volts

Explanation:

Assuming that the area of the loop of current (A) is known, the magnitude of the induced emf can be calculated using Faraday-Lenz's Law:

[tex]emf=|-\frac{\Delta\,\Phi}{\Delta \,t} |=|\frac{A\,B}{\Delta \,t}|=|\frac{A\,(3)}{0.2}|=15\,A[/tex]

and if the area (A) is given in square meters, the emf will directly come in units of Volts.

Answer:

lamda=10.5m

Explanation:

using the equation of progressive wave.

y=Asin(wt-kx)

comparing the two equations together, we have

kx=0.6x , k=0.6

k=2π/λ

0.6=2*3.142/λ

cross multiply

0.6λ=6.284

divide both sides by 0.6

λ=6.284/0.6

λ=10.47m

approximate

λ=10.5m

Answer:

The answer is 6 m/s^2.

Explanation:

by using the formula,

a = v-u/t

Answer:

The Answer is the first one " A quantity that can have more than a single value!

Explanation:

Hope this helps!

Answer  A variable is a quantity that may change within the context of a mathematical problem or experiment. Typically, we use a single letter to represent a variable. The letters x, y, and z are common generic symbols used for variable:

Explanation:

A variable is any characteristics, number, or quantity that can be measured or counted. A variable may also be called a data item. Age, sex, business income and expenses, country of birth, capital expenditure, class grades, eye colour and vehicle type are examples of variables

Answer:

6 seconds is the best answer

It will take 6 seconds to the football in the air.

Velocity is the rate that the position of an item changes relative to time. When forces are applied to an item, it accelerates. This acceleration affects the velocity.

The object's initial velocity, vi, is its speed before acceleration changes it. The new velocity, which has increased for a while, is the final velocity, or vf.

Initial Velocity, denoted as u, is the velocity at time period t = 0. It is the speed at which motion first occurs. There are four equations for starting velocity: The starting velocity is expressed as u = v - at if time, acceleration, and final velocity are given.

Therefore, It will take 6 seconds to the football in the air.

To learn more about Velocity, refer to the link:

https://brainly.com/question/18084516

#SPJ2

Answer:

Explanation:

Rule:

Hope this helps!

Answer:

0.44 m/s^2

Explanation:

initial velocity = 0  (since the child starts from rest)

distance covered by the child = 2 m (the length of the slide)

time taken = 3 sec

acceleration of the child = ?

using Newton's equation of motion

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

where s is the distance covered by the child

u is the initial velocity

a is the acceleration

t is the time spent

substituting values, we have

2 = 0(3) + [tex]\frac{1}{2}a*3^{2}[/tex]

2 = 9a/2

4  = 9a

a = 4/9 = 0.44 m/s^2

Answer:

d. 0.417 m/s

Explanation:

v= ▲x/t

(350-150)/120 s

= .417 m/s

Answer:

The  value is  [tex]t = 9.861 *10^{-8} \ m[/tex]

Explanation:

From the question we are told that

   The  refractive index of glass is [tex]n_{glass} = 1.5[/tex]

     The wavelength is  [tex]\lambda = 710 nm = \frac{710}{1 * 10^9} = 710*10^{-9} \ m[/tex]

      The  refractive index of  oil is  [tex]n_{oil} = 1.8[/tex]

Generally the condition for refractive index is  mathematically represented as

     [tex]2 * t = [m + \frac{1}{2} ] \frac{\lambda}{n_{oil}}[/tex]

Where  t is the separation between two parallel plates of glass , now at minimum  m which is the  order of maxima produced is   =  0

So

     [tex]2 * t = [0 + \frac{1}{2} ] \frac{710 *10^{-9}}{1.8}[/tex]

    [tex]t = 9.861 *10^{-8} \ m[/tex]

Answer:

6.25 g/cm³

Explanation:

2 cm * 2 cm * 3 cm = 12 cm³ (volume)

75 g / 12 cm³ = 6.25 g/cm³

Answer:

dynamics

kinematics

fluid mechanisms

earth science and

physics

Answer:

The object fell from about 38.14 meters

Explanation:

We can use the formula for displacement under accelerated motion due to gravity to find the velocity of the object had 30 m before hitting the ground :

[tex]y_f-y_i=v_i * \,t-\frac{9.8}{2} \,t^2\\0-30=v_i \,(1.5)-4.9\,(1.5)^2\\-18.975=v_i\,(1.5)\\v_i=-12.65\,\,\frac{m}{s}[/tex]

Now, knowing this velocity, we can find the time it took to fall from the initial position to 30 m before hitting the ground:

[tex]v_f=v_i-g\,*\,t\\-12.65=0-g \,*\,t\\t=\frac{12.65}{g} \\t\approx1.29\,\,s[/tex]

And now we can find what is the total distance covered in 1.5 s plus 1.29 seconds for this free falling object:

[tex]y_f-y_i=v_i * \,t-\frac{9.8}{2} \,t^2\\0-y_i=0-\frac{9.8}{2} \,(2.79)^2\\-y_i=-38.14\\y_i=38.14\,\,m[/tex]

Answer:

Point 1. most extreme point.     PE 100%

Point 3 point at mid-height        PE   50%

Point 5 lowest point                  PE     0%

Explanation:

The energy in a pendulum is conserved if we ignore the friction of the air, the total energy is

          Em = ½ k A²

at each point the energy can be written as a potential part and a kinetic part

          Em = PE + K

where Pe is the potential energy and K the kinetic energy

In the entire trajectory the energy passes from one form to the other.

In general there are some points of very high interest.

Point 1. most extreme point in this case the pendulum is stopped and the

          Em = PE  100%

Point 3. point at mid-height

           Em = PE + K

at this point the energy is 50% of each

Point 5. lowest point, at this point the body has a height of ero so its potential energy is zero

            Em = K 100%

potential energy is 0%

Answer: 22 batches.

Explanation:

Given that 11 kg is a familiar weight for a bag of flour. Also, it is given that It takes 500 g of flour to make one batch of cookies.

How many batches of cookies can you make with one bag of flour

Let's first convert 11 kg into grams (g) by multiplying it by 1000

11 × 1000 = 11000 g

Divide 11000 by 500

11000/500 = 22

Therefore, 22 batches of cookies can be made with one bag of flour.

Answer:

Final velocity, v = 1.41 m/s.

Explanation:

It is given that,

Initial velocity of the basketball, u = 4 m/s

Acceleration of the ball, a = -0.5 m/s² (as it slows down)

We need to find the velocity of the basketball after rolling for 14 m. It is a concept of equation of motion in kinematics. Using third equation of motion as :

[tex]v^2=u^2+2ad[/tex]

v is final velocity

[tex]v^2=(4)^2+2\times (-0.5)\times 14\\\\v=\sqrt 2\ m/s\\\\v=1.41\ m/s[/tex]

So, the final velocity of the basketball is 1.41 m/s.

Answer:

1.41

Explanation:

to make you guys feel more secure, i got it from kahn academee

Explanation:

Hey, there!!

Ideal machines are defined as the machines which gives 100% (efficiency) output result without losing the input work. There is possibility have a machine with 100% efficiency but the machines like pulley and lever are somehow.

Hope it helps....

Answer:

in 90 seconds It'll travel 450m At constant speed of 5m/s

Answer:

d = 450 m

Explanation:

                                   d

use the formula   v = ----

                                   t

v = 5 m/s

t = 90 seconds

                d

5 m/s = -------------

             90 sec

d = 5 m/s ( 90 sec)

d = 450 m

Answer:

3.75m/s²

Explanation:

g= GM/r²

For planet 1

[tex]g_{1}[/tex]= GM/r²                   (i)

[tex]g_{1}[/tex] = 15m/s²

for planet 2

radius= 2*r= 2r

g= GM/r

[tex]g_{2}[/tex]= GM/(2r)²

[tex]g_{2}[/tex]= GM/4r²

[tex]g_{2}[/tex]=  GM/r² *1/4

from (i)

[tex]g_{2}[/tex]=  [tex]g_{1}[/tex] *1/4

[tex]g_{2}[/tex] = 15/4

[tex]g_{2}[/tex] = 3.75m/s²