PLEASE HELP ME ANSWER DUE SOON BRAINLIEST FOR WHOEVER

Answer:

C

Explanation:

A theory does not have any proven facts about it, it is just a theory, so this would likely be the best option.

Answer:

A. Scientific theories attempt to explain an entire group of related phenomena.

Explanation:

Explanation:

We know that

V = U + at

Here, u is 0 and a is 9.8 which is acceleration due to gravity.

Thus,

V = 9.8 *7

V = 68.6 m/s

Power describes the rate of the work that is being done. The correct option is A.

Power is defined as the rate at which work is done or the amount of work done per unit time. In other words, power describes how quickly work is being done or how fast energy is being transferred.

The unit of power is the watt (W), which is equal to one joule of work per second.

Power can be calculated by dividing the amount of work done by the time it takes to do that work, or by multiplying the force applied by the distance traveled and dividing by the time it takes to travel that distance.

For example, if a machine does 100 joules of work in 10 seconds, then the power of the machine is 10 watts, calculated as:

Power = Work / Time

Power = 100 J / 10 s

Power = 10 W

Therefore, power describes the rate or speed at which work is being done, and it is measured in watts.

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Answer:

The correct option is;

(B) [tex]\underset{P}{\rightarrow}[/tex] is conserved, K Not conserved

Explanation:

From the diagram related to the question and from the question, we have;

m₁ = m₂ = 2 kg

v₁ = 4 m/s, v₂ = -2 m/s, v₃ = 1 m/s, therefore, we have;

The total initial momentum of the system = m₁ × v₁ + m₂ × v₂

m₁ (v₁ + v₂) = 2×(4 - 2) = 4 kg·m/s

The total final momentum of the system = m₁ × v₃ + m₂ × v₃ = 2 ×1 +2 ×1  = 4 kg·m/s

Given that the total initial momentum = The total final momentum, we have that the momentum, p, is conserved

The kinetic energy of the system before collision  = 1/2×m₁×v₁² + 1/2×m₂×v₂²

∴ The kinetic energy of the system before collision  = 1/2*2*(4)² + 1/2*2*(-2)² = 20 J

∴ The kinetic energy of the system after collision  = 1/2×m₁×v₃² + 1/2×m₂×v₃²

1/2*2*(1)² + 1/2*2*(1)² = 2 J

The kinetic energy of the system before collision ≠ The kinetic energy of the system after collision

Therefore, the kinetic energy of the system is not conserved.

If the velocities of object X and object Y after collision is the same (inelastic collision), then only momentum is conserved but if the velocities of both objects after collision are different (elastic collision), then both momentum and kinetic energy are conserved.

According to principle of conservation of linear momentum, the total momentum before and after collision is conserved.

For inelastic collision, only momentum is conserved while kinetic energy is not conserved.

[tex]m_1u_1 \ + \ m_2u_2 = v(m_1 + m_2)[/tex]

[tex]\frac{1}{2} m_1u_1^2 \ + \frac{1}{2} m_2u_2^2 = \frac{1}{2}v^2(m_1+m_2)[/tex]

For elastic collision, both momentum and kinetic energy are conserved;

[tex]m_1u_1 \ + \ m_2u_2 =m_1v_1 \ + \ m_2v_2[/tex]

[tex]\frac{1}{2} m_1u_1^2 \ + \frac{1}{2} m_2u_2^2 = \frac{1}{2}m_1v_1^2 \ +\ \frac{1}{2}m_2v_2^2[/tex]

Thus, we can conclude that, if the velocities of object X and object Y after collision is the same (inelastic collision), then only momentum is conserved but if the velocities of both objects after collision are different (elastic collision), then both momentum and kinetic energy are conserved.

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Answer:

If your form is correct (b)

Answer:

The answer is B if your form is correct

Answer:

Both the earth and the moon go through rotation.

Explanation:

The earth rotates when going around the sun and the moon rotates when circling the earth

Answer:

6 cereal bars = 222g, which is much less than 1kg

Explanation:

Answer:

yes, a stone in the ground is a example of newtons first law of motion because it does change it position until an external force is applied.

(Newton’s first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. )

Explanation:

Answer: this answer is D. That's what I think it is

Explanation:

Answer:

An acid is a compound that increases hydrogen ions (H+) when it is dissolved in a solution.

all I got

Answer:

zone coverage is about sensing what the offense is attempting to accomplish against the defense. Each defensive player reacts when the ball is in the air, whereas in man-to-man coverage, he simply plays the receiver.

Explanation:

Answer:

GPE = 0 (when the golf is downhill)

GPE = 0.81 [J](when the golf is at the highest point of the hill)

Explanation:

In order to solve this problem, we must use the principle of energy conservation, which tells us that energy is transformed from kinetic energy to potential energy or vice versa.

We must define a reference energy point, where at this point the potential energy is zero. Let's take this point at the bottom of the hill.

At this point where the potential energy is zero, all the potential energy will have been transformed into kinetic energy, at this point the velocity will be maximum.

[tex]E_k=E_p\\where:\\E_{p}=m*g*h\\E_{k}=\frac{1}{2} *m*v^{2}[/tex]

where:

m = mass = 45 [g] = 0.045 [kg]

g = gravity acceleration = 9.81 {m/s²]

h = elevation [m]

v = velocity = 6 [m/s]

[tex]E_{k}=\frac{1}{2}*0.045*(6)^{2} \\E_{k}=E_{p}=0.81 [J][/tex]

GPE = 0 (when the golf is downhill)

GPE = 0.81 [J](when the golf is at the highest point of the hill)

Answer:

Constant Speed

Explanation:

Answer:

Friction, inertia and constant speed

Explanation:

The friction and inertia create an equilibrium

Answer:

B)

Explanation:

Scientific method- a method of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.

in this, the scientist had to test their theories to find a solution to their problem.

ANSWER

A convex lens acts a lot like a concave mirror. ... A concave lens acts a lot like a convex mirror. Both diverge parallel rays away from a focal point, have negative focal lengths, and form only virtual, smaller images.

The magnitude of the resultant vector is 4.14m and the direction is 50°.

The resultant magnitude of the vector is the sum of the algebraic forces acting at the point.

The magnitude of the resultant vector, F is calculated below:

[tex]F = \sqrt{3.14^{2} + 2.71^{2}} = 4.14m[/tex]

The direction is given below as follows:

[tex]x = tan^{-1} × \frac{3.14}{2.71} = 50[/tex]

Therefore, the magnitude of the resultant vector is 4.14m and the direction is 50°.

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Answer:

240 N

Explanation:

The Centripetal force of the spun ball is 240 N.

The Centripetal force can be calculated using the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, The Centripetal force of the spun ball is 240 N.

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To reach the soccer field located 22 m from the school, required horizontal velocity  is 25.88 meter/second.

The primary indicator of an object's position and speed is its velocity. It is the distance that an object travels in one unit of time. The displacement of the item in one unit of time is the definition of velocity.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

The time of falling of the ball = √(2h/g)

= √( 2 × 3.5/9.8) second.

= 0.85 second.

hence, to reach the soccer field located 22 m from the school, required horizontal velocity = distance/time

= 22 meters/0.85 seconds

= 25.88 meter/second.

Hence, the required horizontal velocity  is 25.88 meter/second.

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Answer:

moving at a fast pace

Explanation:

Answer:

Explanation:

Given

initial velocity u = 15m/s

Height below the water = 25m

a) Using the equation of motion S = (v+u)/2 * t

25 = 0+15/2 * t

25 = 7.5t

t = 25/7.5

t = 3.33s

Hence it will take 3.33secs to reach the water

b) The horizontal distance is expressed as;

S = Uxt

S = 15(3.33)

S  = 50m

Hence the horizontal distance from the cliff where the car entered the water is 50m

c) The velocity of the car v.

Using the equation of motion;

v² = u²+2gS

v² = 15²+2(9.8)(25)

v² = 225+490

v = √715

v = 26.74m/s

Hence the car hit the water at the velocity of 26.74m.s

the second one

Explanation:

it isn't really a product tho its a byproduct

Answer:

metric dimensions, i think

Explanation:

Answer:

d = 134.11 m

Explanation:

Speed of an airplane, = 600 mph

We need to find the distance moved in 0.5 s (to scan the instruments).

1 mph = 0.44704 m/s

It means,

600 mph = 268.22 m/s

Speed = distance/time

Distance, d = v t

d = 268.22 m/s × 0.5 s

d = 134.11 m

So, the distance moved by airplane is 134.11 m.

Answer:

Explanation:

very far look this up in the search the answer is there

Answer:

D = 72.96 km,      θ = 36.43º

Explanation:

This is a vector addition exercise, we are going to solve it by decomposing the displacements.

First displacement

         cos 35 = x₁ / L

         x₁ = L cos 35

         cos 35 = y₁ / L

         y₁ = L sin 35

         x₁ = 22.0 cos 35 = 18.0 km

         y₁ = 22 sin 35 = 12,619 km

Second displacement

         cos 60 = x₂ / L

         x₂ = L cos 60

         x₂ = 47 cos 60 = 23.5 km

        sin 60 = y₂ / L

        y₂ = L sin 60

        y₂ = 47 sin 60 = 40.70 m

In total displacement it is

       x_total = x₁ + x₂

       x_total = 18 + 40.7 = 58.7 km

       y_total = y₁ + y₂

       y_total = 12.629 +40.70

       y_total = 53,329 km

Let's use the Pythagorean theorem

        D = √(x_total² + y_total² )

        D = √ (58.7² + 43,329²)

        D = 72.96 km

For the direction we use trigonometry

         tan θ = y_total / x_total

         θ= tan-1 (43,329 / 58.7)

         θ = 36.43º

Kinetic energy = (1/2) (mass) (speed)²

The coaster's original kinetic energy was

KE = (1/2) (2,000 kg) (10 m/s)²

KE = (1,000 kg) (100 m²/s²)

KE = 100,000 kg-m²/s²

old KE = 100,000 joules

After something slowed it down, its new kinetic energy is

KE = (1/2) (2,000 kg) (6 m/s)²

KE = (1,000 kg) (36 m²/s²)

KE =  36,000 kg-m²/s²

new KE = 36,000 joules

The coaster lost (100,000 - 36,000) = 64,000 joules of KE.

Energy is conserved.  It can't evaporate, disappear, or be destroyed.

That 64,000 joules had to go somewhere.

Someone or something had to do 64,000 joules of work on it in order to slow it down.

The work done by the external force on the roller coaster is 64000 J.

Given that the mass of The roller coaster is 2000 kg and its velocity is 10 m/s. The kinetic energy of the roller coaster is given below.

[tex]KE = \dfrac {1}{2}mv^2[/tex]

[tex]KE = \dfrac {1}{2}\times 2000\times (10)^2[/tex]

[tex]KE = 100000 \;\rm J[/tex]

Since the roller coaster has a force of unknown magnitude which decreases its speed to 6 m/s. For this decreased speed, the kinetic energy is given as below.

[tex]KE'= \dfrac {1}{2}mv'^2[/tex]

[tex]KE'= \dfrac {1}{2}\times 2000\times 6^2[/tex]

[tex]KE' = 36000\;\rm J[/tex]

The work done on the roller coaster is calculated by the change in the kinetic energy for both speeds.

Work Done = KE - KE'

Work = 100000 - 36000

Work = 64000 J

Hence we can conclude that the work done by the external force on the roller coaster is 64000 J.

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