Define SI system of measurement.

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Answer:

When the coin rolls down the ramp, it acquires a tangential velocity, and so travels in circles around the wishing well. As gravity pulls the coin down the curve, the circles get smaller. Since angular momentum must be conserved, the coin's speed increases as it goes further down the funnel.

Answer:

Dalton’s atomic theory was a scientific theory on the nature of matter put forward by the English physicist and chemist John Dalton in the year 1808. It stated that all matter was made up of small, indivisible particles known as ‘atoms’.

Explanation:

Atoms can be divided into their subatomic particles.

The statement that is part of Dalton's atomic theory is as follows: Matter is composed of small particles called atoms.

John Dalton is a scientist that first stated the theory of chemical combination in 1803.

The components of these theory are as follows:

Therefore, according to this question, the statement that is part of Dalton's atomic theory is as follows: Matter is composed of small particles called atoms.

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Answer:

gas

Explanation:

it is gas because the particles are floating up none of the above would be floating up.

Answer:

Solid

Explanation:

A: Solid- Solids have the particles tightly packed. They have a definite shape and volume

B: Liquid- Liquids have particles not to tightly packed but kind of loose. They have an indefinite shape but a definite volume

C: Gas- Gas has particles freely all around. Indefinite shape and volume

D: Plasma- Plasma is different and should be explained with an example; think of lighting....

Since the image shows tightly packed particles, it is clear the answer is a solid.

Answer:

It does not represent a physical change

Answer:

chemical change as death is irreversible

Answer:

A for sure

Explanation:

Answer:

You have learnt how objects move. You also know that a moving object like a ball rolling on the ground slows down. Sometimes it may change its direction of motion. It is also possible that the ball may slow down and also change its direction. what makes an object to slow down or go faster, or change its direction of motion?

Let us recall some of our everyday experiences. What do you do to make a football move? What do you do to make a moving ball move faster? How does a goalkeeper stop a ball? How do fielders stop a ball hit by a batsman? A hockey player changes the direction of the moving ball with a flick of the stick. In all these situations the ball is either made to move faster or slower or its direction of motion is changed.

Explanation:

Answer:

is used to display images

Explanation:

Answer:

a) F₃ = 108.71 N ,    θ = 218.68º    b)  m = 0.8487 kg

Explanation:

a) To solve this problem we will use Newton's second law, in the first part the accuracy is zero

          ∑ F = 0

X axis

          F₁ₓ + F₂ₓ + F₃ₓ = 0

          F₃ₓ = - F₁ₓ -F₂ₓ

Y axis

         [tex]F_{1y}[/tex] + F_{2y} + F_{3y} = 0

         F3y = -F_{1y} -F_{2y}

Let's use trigonometry to find the components of the applied forces

         cos 70 = F₁ₓ / F₁                 F₁ₓ = F₁ cos 70

         sin 70 = F_{1y} / F₁             F_{1y} = F₁ sin 70

         cos 20 = F₂ₓ / F2               F₂ₓ = F₂ cos 70

         sin 20 = F_{2y} / F₂           F_{2y} = F₂ sin 70

         F₁ₓ = 45 cos 70 = 15.39 N

         F_{1y} = 45 sin 70 = 42.29 N

         F₂ₓ = 75 cos 20 = 70.48 N

         F_{2y} = 75 sin 20 = 25.65 N

let's calculate

        F₃ₓ = -15.39 - 70.48

        F₃ₓ = -85.87 N

        F_{3y} = -42.29 - 25.65

        F_{3y} = -67.94 N

this is the force that must be applied to keep the system in equilibrium, we can give this value in the form of module and angle

         F₃ = √ (F₃ₓ² + F_{3y}²)

         F₃ = √ (85.87²  +67.94²)

         F₃ = 108.71 N

         tan θ = F₃ = [tex]F_{3y}[/tex] / F₃ₓ

         θ = tan⁻¹ (67.94 / 84.87)

         θ = 38.68º

Since the two values ​​are negative, this angle is in the third quadrant, therefore the measuring angle n counterclockwise from the positive side of the x-axis is

        θ = 180 + 38.68

        θ = 218.68º

b) It is not clear, but we must suppose that the person exerts this force F3 in the direction of movement, bone at an angle θ= 39.68º, in this case Newton's equation for the x axis remains

         F₁ₓ + F₂ₓ + F₃ₓ = m a

         m = (F₁ₓ + F₂ₓ + F₃ₓ) / a

let's calculate

          m = (15.39 + 7048 + 85.87) / 200

          m = 0.8487 kg

Answer:

gbh

Explanation:

Answer:

1.25

Explanation:

acceleration = velocity÷time

Answer:

Its acceleration is 1.25 meters/second2

Explanation:

The car's average acceleration would be 1.25m/s^2 or 1.25meters/second/second. That looks to be the fourth one you've listed.

False - Every object which is not transparent and translucent reflect light. In order to see colours, the object absorb light and reflect the light we see.

Answer:

4.65.3 heehiwijwjwwjwhh

Explanation:

behsjjejejnndjjje

Answer:

D

Explanation:

Answer:

Inertia; Newton's First Law

Explanation:

When you hit you're breaks, the force you feel that pulls you forward is due to inertia.

Newton's first law says that "every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force." The question is a perfect example of this.

It is due to the inertia of motion of the objects that they fall on the floor bed. This is also called Newton's first law of motion.

Newton's first law of motion is known as the law of inertia.

Given is a man who is driving a car at 35 mph hits his brakes suddenly in order to avoid hitting a dog. During the incident, everything in the front seat of his car slides forward and into the floorboard.

The property of body by virtue of which it resist any change in its state of rest or uniform motion is called inertia of body. When the car was moving at 35 mph, every object on front seat was also moving with the same speed. However, when the brakes were applied, they were applied on the car and not on the objects in the front seat. Hence, they keep moving forward and stop only when they strike and fall down. This is called inertia of motion. This is Newton's first law of motion.

Therefore, it is due to the inertia of motion of the objects that they fall on the floor bed. This is also called Newton's first law of motion.

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Answer:

False

Explanation:

inductive arguments have some evidence but do not have full assurance of truth of the conclusion

Complete Question

The complete question is shown on the first uploaded image

Answer:

a

  [tex]p = 14033.7 \ kg\cdot m/s[/tex]

b

  [tex]v = 1.22 \ m/s[/tex]

c

 [tex]m_2 = 9506.7 \ kg[/tex]  

Explanation:

From the question we are told that

     The mass of the coal car is  [tex]m_1 = 4527 \ kg[/tex]

     The velocity is  [tex]v_i = 3.1 \ m/s[/tex]

     The load of coal dropped is [tex]m_2 = 6952 \ kg[/tex]

Generally the momentum of the system before the coal is added is mathematically represented as

            [tex]p = m_j * v_i[/tex]

=>         [tex]p = 4527 * 3.1[/tex]

=>         [tex]p = 14033.7 \ kg\cdot m/s[/tex]

Generally from the law of momentum conservation is mathematically represented as

          [tex]m_1 * v_i + m_2 * v_2 = (m_1 + m_2 )v[/tex]

Here [tex]v_2[/tex] is the velocity of the load before it is dropped and the value is 0 m/s

So

 =>    [tex]v =\frac{m_1 * v_i }{m_1 + m_2}[/tex]

      [tex]v = \frac{4527 * 3.1 }{( 4527 + 6952 )}[/tex]

=>    [tex]v = 1.22 \ m/s[/tex]

When v =  1m/s  and  [tex]m_1[/tex] remain the same

Then

=>    [tex]1 =\frac{4527 * 3.1 }{4527 + m_2}[/tex]

=>    [tex]4527 + m_2 = 14033.7[/tex]

=>    [tex]m_2 = 9506.7 \ kg[/tex]  

Answer:

D- Z, X, Y, W

Explanation:

Correct on edge

Answer:

It involves both energy transformation and energy transfer.

Explanation:

In the hydroelectric power plant, the energy is transformed from kinetic energy to electricity. Therefore, option (A) is correct.

In the hydroelectric power plant, electric energy is generated using water from a turbine. The moving water is used to propel the turbines. At first, a large amount of the flowing water is stored across the dams. The kinetic energy of moving water is stored as potential energy in the dams.

Then the stored water will fall on the turbines and rotate the turbines which causes the potential energy of water to be used to turn the turbines which is mechanical energy.

Therefore, the potential energy of water is converted into mechanical energy. Then the rotating turbines generate electricity and the mechanical energy is converted into electrical energy.

Therefore, the hydroelectric power plant converts the kinetic energy of water into electrical energy.

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Answer:

B is correct

Explanation:

Maximum Kinetic energy= Work done.

Now, Work done=mgh=mg(L−Lcosθ)=mgL(1−cosθ)

Option B is thus correct.

Explanation:

Momentum is conserved when there is no net external force.  So momentum is conserved in the direction parallel to the incline.

p₀ = p

m v cos θ = (m + M) vₓ

vₓ = m v cos θ / (m + M)

After the collision, energy is conserved.

PE = KE

(m+M) gh = ½ (m+M) vₓ²

gh = ½ vₓ²

h = vₓ² / (2g)

d sin θ = [m v cos θ / (m + M)]² / (2g)

d = [m v cos θ / (m + M)]² / (2g sin θ)

Answer:

because of glass' higher refractive index

Explanation:

air and vacuum have a lower refractive index and are optically lighter, so light travels faster.

whereas glass has a higher optical density, so light travels slower

Answer:

C

Explanation:

There's a reason newton's 3rd law is called action-reaction :D

A - 1st law/inertia

B - 2nd law/f=ma

Newton's third law of motion states that for each action there is an equal and opposite reaction or force. Thus, the correct option is C.

Newton's third law of motion states that for every action or force applied in nature there is an equal and opposite reaction or force.

According to Newton's third law of Motion, if an object A exerts a force on the object B, then the object B must exert a force which is of equal magnitude and opposite direction back on the object A. This law represents symmetry in nature with the forces which are always occur in pairs, and one body cannot exert a force which is on another object without experiencing a force itself.

Therefore, the correct option is C.

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a higher energy than an electron near the nucleus

In an electron cloud, an electron that is farther away from the nucleus has a higher energy than an electron near the nucleus. Thus, the correct option is C.

An electron cloud is the region which is surrounding an atomic nucleus in which there is a very high probability of an electron being located in an atom. The probability of finding an electron is greater than the more dense regions of the electron cloud in the atom.

One way in which the elements differ from each other is the structure of the electron cloud in each of the element's atoms in an electron cloud and the electrons which is farther from the nucleus has a higher energy than an electron near the nucleus of the atom.

Therefore, the correct option is C.

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From a flying plane a body should dropped in advance to hit the target,Why? ... The body should be dropped in advance as when the body is dropped it has the velocity of the plane. So, in air the body moves forward which we have to take into consideration in order to hit the target.

I feel like I'm in a city

Answer:

0.03 cm

Explanation: If the scale is 500:1, you have to divide 500 by 15 to get 0.03. You do not multiply 500 times 15 because the cells are smaller than the scale representation so you divide.

Answer:

(a) V₂ = 1.86 m/s

(b) Q = 5.1 x 10⁻⁴ m³/s

Explanation:

(a)

The formula derived for Venturi tube is as follows:

P₁ - P₂ = (ρ/2)(V₂² - V₁²)

where,

P₁ - P₂ = Difference in Pressure of Inlet and Outlet = 1.2 KPa = 1200 Pa

ρ = Density of Gasoline = 7.4 x 10² kg/m³

V₂ = Exit Velocity = ?

V₁ = Inlet Velocity

Therefore,

1200 Pa = [(7.4 x 10²kg/m³)/2](V₂² - V₁²)

V₂² - V₁² = (1200 Pa)/(3.7 x 10² kg/m³)

V₂² - V₁² = 3.24 m²/s²   ------------------- equation (1)

Now, we will use continuity equation:

A₁V₁ = A₂V₂

where,

A₁ = Inlet Area = πd₁²/4 = π(0.0374 m)²/4 = 1.098 x 10⁻³ m²

A₂ = Exit Area = πd₂²/4 = π(0.0187 m)²/4 = 2.746 x 10⁻⁴ m²

Therefore,

(1.098 x 10⁻³ m²)V₁ = (2.746 x 10⁻⁴ m²)V₂

V₁ = (2.746 x 10⁻⁴ m²)V₂/(1.098 x 10⁻³ m²)

V₁ = 0.25 V₂  

using this value in equation (1):

V₂² - (0.25 V₂)² = 3.24 m²/s²

0.9375 V₂² = 3.24 m²/s²

V₂² = (3.24 m²/s²)/0.9375

V₂ = √(3.456 m²/s²)

V₂ = 1.86 m/s

(b)

For fluid flow rate we use the following equation:

Flow Rate = Q = A₂V₂ = (2.746 x 10⁻⁴ m²)(1.86 m/s)

Q = 5.1 x 10⁻⁴ m³/s

The formula for finding variables in a  Venturi tube is shown below:

P₁ - P₂ = (ρ/2)(V₂² - V₁²)

where, P₁ - P₂ is difference in pressure of Inlet and outlet, ρ = density, V₂ = exit velocity and V₁ is inlet velocity

P₁ - P₂ = 1.2 KPa = 1200 Pa

ρ = 7.4 x 10² kg/m³

V₂ = Exit Velocity = ?

V₁ = Inlet Velocity

We then substitute the variables into this equation.

P₁ - P₂ = (ρ/2)(V₂² - V₁²)

1200 Pa = [(7.4 x 10²kg/m³)/2](V₂² - V₁²)

V₂² - V₁² = (1200 Pa)/(3.7 x 10² kg/m³)

V₂² - V₁² = 3.24 m²/s²  ------ equation (1)

The  continuity equation A₁V₁ = A₂V₂ is then used

where,A₁ = Inlet area = πd₁²/4 = π(0.0374 m)²/4 = 1.098 x 10⁻³ m²

A₂ = Exit Area = πd₂²/4 = π(0.0187 m)²/4 = 2.746 x 10⁻⁴ m²

(1.098 x 10⁻³ m²)V₁ = (2.746 x 10⁻⁴ m²)V₂

V₁ = (2.746 x 10⁻⁴ m²)V₂/(1.098 x 10⁻³ m²)

V₁ = 0.25 V₂  

We then substitute the value into equation 1

V₂² - (0.25 V₂)² = 3.24 m²/s²

0.9375 V₂² = 3.24 m²/s²

V₂² = (3.24 m²/s²)/0.9375

V₂ = √(3.456 m²/s²)

V₂ = 1.86 m/s

This can be calculated using the formula

Flow Rate = Q = A₂V₂

                  = (2.746 x 10⁻⁴ m²)(1.86 m/s)

                 = 5.1 x 10⁻⁴ m³/s

Answer:

4.356e-6 Newtons

Explanation:

Using the equation for the force of gravity F=[tex]\frac{Gm_1m_2}{r^2}[/tex]. The two masses are m1=800kg and m2=1000 kg. The value of G, the gravitational constant =6.67e-11. The problem states the distance between the center of masses of the two cars is 3.5 meters(r). Plugging in what we have from the problem, you will get 4.346e-6 newtons. This makes sense as gravity in itself is a weak force requiring extremely massive objects to result in a noticeable force.