Which statement best defines constructive interference? O Energy reflects back toward the source of its power. O Two waves with identical crests and troughs meet. thing O A wave appears to be at a standstill and vibrates in place O The trough of one wave matches the crest of another.​

ANSWER

EXPLANATION

The kinetic energy of a body is the energy it possesses due to its motion and it can be found by applying the formula:

where m = mass, v = velocity

From the question:

Therefore, the kinetic energy of the ball is:

The mass of rifle is M = 5kg . It fires the bullet of mass m =24 g = 0.024 kg

It travels a distance, d = 1.5 m and the time taken is t = 0.0023 s

The speed of the bullet will be

Let the recoil velocity be V. The initial velocity will be zero as rifle and bullet are at rest.

According to the conservation of momentum

Here, rifle and bullet travel in opposite directions.

Substituting the values, the recoil velocity will be

Answer:

Un eclipse solar se produce cuando la luna se interpone en el camino de la luz del sol y proyecta su sombra en la Tierra. Eso significa que durante el día, la luna se mueve por delante del sol y se pone oscuro. ... Este eclipse total se produce aproximadamente cada año y medio en algún lugar de la Tierra.

Explanation:

espero que te haya servido

Answer: the answer would be b in k12

Explanation:

Answer:

Vf = 0.68 m/s

Explanation:

First we find acceleration of the marble by using 2nd equation of motion:

s = Vi t + (1/2)at²

where,

s = distance covered = 140 cm = 1.4 m

t = time taken = 4.1 s

Vi = initial Velocity = 0 m/s (since, the marble was initially at rest)

a = acceleration = ?

Therefore,

1.4 m = (0 m/s)(4.1 s) + (1/2)(a)(4.1 s)²

a = (1.4 m)(2)/(4.1 s)²

a = 0.17 m/s²

Now, we use 1st equation of motion for final velocity (Vf)

Vf = Vi + at

Therefore,

Vf = 0 m/s + (0.17 m/s²)(4.1 s)

Vf = 0.68 m/s

Answer:

Domestic gadgets like the mixer-grinders, pressure cookers, desert coolers, air- conditioners, exhaust fans, vacuum cleaners, sewing and washing machines are all indoor sources of noise pollution.

Explanation:

The vectors can be expressed using unit vectors as follows:

Vector A = 96N i + 96N j + 0N k

Vector B = 76.6N i + 64.3N j + 0N k

Vector C = 64N i + 48N j + 0N k.

In the given diagram, let's consider the vectors as follows:

Vector A with magnitude 120N, Vector B with magnitude 100N, and Vector C with magnitude 80N.

To express these vectors using unit vectors i, j, and k, we need to determine their respective components in the x, y, and z directions.

For Vector A (120N), we have the following information:

Magnitude = 120N

Direction: X-axis (cosine component) with an angle of 37° and Y-axis (sine component) with an angle of 53°.

Using the trigonometric values provided:

cos37° = 0.8 and sin53° = 0.8

Therefore, the components of Vector A are:

Ax = 120N * 0.8 = 96N (in the X-direction)

Ay = 120N * 0.8 = 96N (in the Y-direction)

Az = 0N (no component in the Z-direction)

Thus, Vector A can be written as 96N i + 96N j + 0N k.

Similarly, using the trigonometric values for Vector B and Vector C, we can calculate their components:

For Vector B (100N):

Bx = 100N * cos40° = 100N * 0.766 = 76.6N

By = 100N * sin40° = 100N * 0.643 = 64.3N

Bz = 0N

Vector B can be expressed as 76.6N i + 64.3N j + 0N k.

For Vector C (80N):

Cx = 80N * cos37° = 80N * 0.8 = 64N

Cy = 80N * sin37° = 80N * 0.6 = 48N

Cz = 0N

Vector C can be written as 64N i + 48N j + 0N k.

In summary, the vectors can be expressed using unit vectors as follows:

Vector A = 96N i + 96N j + 0N k

Vector B = 76.6N i + 64.3N j + 0N k

Vector C = 64N i + 48N j + 0N k.

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When a piece of iron cools from 100 °C to 40 °C, 2,208,000 J of specific heat are released.

The equation q = mcT, where m is the mass of the sample, c is the specific heat, and T is the temperature change, may be used to determine how much heat a sample absorbs or loses (q).

The following formula may be used to determine how much heat the iron piece emits:

Q = mcΔT

Here, the mass of the iron is 80.0 g, its specific heat capacity is 460 J/kg℃, and the temperature change is

(100℃-40℃)=60 ℃.

Q = (80.0 g) x (460 J/kg℃) x (60 ℃)

Q = 2,208,000 J

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Answer:

a) a= 19 m/s2, b ) F = F = 38 N

c)  the correct one is B

Explanation:

1) To solve this exercise, let's use the concept of torque, let's start by looking for the mass of the mass of the head, which is 65 of 65 kg

         m= 0.06  65 = 3.9 kg

torque is defined

        τ = F x R

the bold indicate vectors

        τ = F R sin θ

the force is the weight of the head and the distance R = 0.20 m

        τ = mg R sin θ

        τ = 3.9 9.8 0.2 sin 50

        τ = 5.86 N m

Newton's second law expression for rotational motion is

         τ = I α

In general, the head is approximated by a sphere, so the moment of foolishness with respect to the base of the neck (turning point) using the parallel axis theorem is

         I = I_sphere + m d²

Neck height data is not indicated, so we will assume that it is zero (d = 0)

         I = 2/5 m R²

angular and linear acceleration are related

        a = α R

        α = a / R

let's replace

         τ = 2/5 mR²  (a / R)

        a = 5/2 τ / mR

let's calculate

         a = 5/2 5.86 / (3.9 0.2)

         a = 18.8 m / s²

         a= 19 m/s²

2) as the neck and the head are related, the forces are action and reaction, therefore the neck force is

         F = m g

         F = 3.9 9.8 = 38.2 N

          F = 38 N

3) He asks us about the efficiency of the headrest, after reviewing the different alternatives, the correct one is B

Yes. A headrest ensures that both the head and the body experience the same forward force at approximately the same time.

1) The velocity of the pin after the collision is 107.4 m/s.

2) The velocity of the two cars as the collision is inelastic is 48.2 m/s.

We know that by the principle of the conservation of linear momentum, the momentum before Collison is equal to the total momentum after collision. Now we have to use this principle in the both questions that we have here.

1) Given that;

Total momentum before collision = Total momentum after collision

(41.7 * 59.1) + (4.17 * 0) = (41.7 * 48.35) + ( 4.17 * v)

We then have;

2464 + 0 = 2016 +  4.17v

2464 - 2016 = 4.17v

v = 2464 - 2016 /4.17

v = 107.4 m/s

2) Given that;

Total momentum before collision = Total momentum after collision

(51.3 * 50.1) + (100 * 47.2) = (100 +  51.3)v

2570 + 4720 = 151.3v

v = 2570 + 4720/151.3

v = 48.2 m/s

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The weight of the object at distance 3R from the Earth is 10 N if the weight at center of the Earth is 90N.

According to Newton's law of gravitation,

Weight W = m × g; where m is the mass of the object and

g is the acceleration due to gravity.

Also,

\(g = \dfrac{GM}{R^{2}}\)

where G=gravitational constant, M=mass of earth, R=radius of earth.

Hence,

\(W = m \times \dfrac{GM}{R^{2}}\)

Weight is inversely proportional to the square of radius R.

Weight of objects at the surface of the earth is 90 N.

Let W be the weight at a distance of 3 R from the center.

\(\dfrac{W}{90} = \dfrac{R^{2}}{(3R)^{2}}\\\dfrac{W}{90} = \dfrac{1}{9}\\W = 10\)

Weight at a distance 3 R is 10 N.

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Answer:

(a)0.531m/s

(b)0.00169

Explanation:

We are given that

Mass of bullet, m=4.67 g=\(4.67\times 10^{-3} kg\)

1 kg =1000 g

Speed of bullet, v=357m/s

Mass of block 1,\(m_1=1177g=1.177kg\)

Mass of block 2,\(m_2=1626 g=1.626 kg\)

Velocity of block 1,\(v_1=0.681m/s\)

(a)

Let velocity of the second block  after the bullet imbeds itself=v2

Using conservation of momentum

Initial momentum=Final momentum

\(mv=m_1v_1+(m+m_2)v_2\)

\(4.67\times 10^{-3}\times 357+1.177(0)+1.626(0)=1.177\times 0.681+(4.67\times 10^{-3}+1.626)v_2\)

\(1.66719=0.801537+1.63067v_2\)

\(1.66719-0.801537=1.63067v_2\)

\(0.865653=1.63067v_2\)

\(v_2=\frac{0.865653}{1.63067}\)

\(v_2=0.531m/s\)

Hence, the  velocity of the second block after the bullet imbeds itself=0.531m/s

(b)Initial kinetic energy before collision

\(K_i=\frac{1}{2}mv^2\)

\(k_i=\frac{1}{2}(4.67\times 10^{-3}\times (357)^2)\)

\(k_i=297.59 J\)

Final kinetic energy after collision

\(K_f=\frac{1}{2}m_1v^2_1+\frac{1}{2}(m+m_2)v^2_2\)

\(K_f=\frac{1}{2}(1.177)(0.681)^2+\frac{1}{2}(4.67\times 10^{-3}+1.626)(0.531)^2\)

\(K_f=0.5028 J\)

Now, he ratio of the total kinetic energy after the collision to that before the collision

=\(\frac{k_f}{k_i}=\frac{0.5028}{297.59}\)

=0.00169

Answer:

An object in a motion when it is continuously changing its position based on a reference point and observed by a person or a device.

If the engine of a boat on a river is turned off while the boat is moving with a steady speed, several things would happen Loss of propulsion,Drifting,Loss of steering control and Potential hazards.

Loss of propulsion: Without the engine running, the boat would lose its power source for propulsion. The boat would gradually slow down and eventually come to a stop unless other external forces, such as currents or wind, continue to move it.

Drifting: Once the boat comes to a stop, it would start to drift with the current of the river or be affected by wind forces. The direction and speed of the drift would depend on the strength and direction of the current or wind.

Loss of steering control: When the engine is turned off, the boat's steering mechanism, such as a rudder, would also lose power. Without the ability to steer, the boat would follow the course determined by the river's current or the wind direction.

Potential hazards: Depending on the surroundings and the current conditions, there could be potential hazards for a boat that is no longer under power. These hazards might include other vessels, obstacles, shallow areas, or strong currents. The boat's crew would need to take appropriate actions to ensure the safety of the boat and its occupants.

It's important to note that the specific behavior of the boat after the engine is turned off can vary depending on factors such as the size and design of the boat, the strength and direction of the current, and the presence of wind or other external forces.
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Answer:

4.4 x 10^-12 N right

Explanation:

A motional emf is emf = Blvsinθ, where B is the magnetic field and l is the length of the rod and v is the velocity.

By considering two cases:

1) The angle between the rod and the magnetic field, the magnetic field is separated into two components. The perpendicular component is defined by the length and velocity and the other component lying inside it. The emf is produced by the perpendicular component and the magnitude of the magnetic field is B(perpendicular) = Bsinθ. The emf is

          ε = Bvlsin(θ).

2) In the second case, the component of velocity produces the emf, and the perpendicular component is defined by the length and magnetic field. The perpendicular component of velocity, V(perpendicular) = v sinθ. The emf is,

        ε = Bvlsin (θ).

Hence, it is proved that B, v, and l are not mutually perpendicular to each other.

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The ratio of the sum of quantities to the entire number of quantities is what is simply meant by the word "average."

The change in location of an object with respect to time is referred to as its speed. On the other hand, velocity is nothing more than the speed that is specified in relation to the direction that an item travels.

The definition of average velocity states that it is the product of an object's displacement from point a to point b and the time it takes to complete that displacement. It should be noticed that we emphasize direction by emphasizing movement rather than distance.

The average velocity of the body to gain a notion of its overall journey if the velocity of the body changes constantly during a certain time.

Therefore, The ratio of the sum of quantities to the entire number of quantities is what is simply meant by the word "average."

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answer:

uhm this makes no sense like at all so chile anyways

explanation:

An object need to move in a straight line in the same direction in equal intervals of time in order for total distance traveled and displacement to be equal.

Answer is

Elements are pure substances which are composed of only one type of atom. Compound are substances which are formed by two or more different types of elements that are united chemically in fixed proportions.

Explanation:

I think that's the correct answer sorry if im wrong

Answer:

Resistance = 5.14 Ohms

Explanation:

Given the following data;

Quantity of charge, Q = 2.8*10^5C

Time = 1hour to seconds = 60*60 = 3600 seconds

Voltage = 400V

First of all, we would find the current flowing through

Q = it

2.8*10^5 = I*3600

Current, I = 280000/3600

Current, I = 77.78 Amps

To find the resistance;

Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.

Mathematically, Ohm's law is given by the formula;

Voltage = current * resistance

Resistance = voltage/current

Resistance = 400/77.78

Resistance = 5.14 Ohms

This is 20 plus 6.5 squared, which equals.Nearly nine 478 is what this equates to.This system therefore has a 9.47 mechanical advantage.

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Answer:

We can solve this problem using the kinematic equation:

y = 1/2 * g * t^2

where y is the height of the tree, g is the acceleration due to gravity (9.8 m/s^2), and t is the time taken to fall to the ground.

We can solve for t using:

t = sqrt(2y/g)

Plugging in the values, we get:

t = sqrt(2(19)/9.8)

t = 2.19 seconds

So, it takes 2.19 seconds for the acorn to fall from the tree to the ground.

To find the velocity of the acorn just before it hits the ground, we can use:

v = g * t

Plugging in the values, we get:

v = 9.8 * 2.19

v = 21.46 m/s

So, the acorn is going approximately 21.46 m/s just before it hits the ground.

Explanation:

In the velocity vs. time graph, the displacement of the object after 1 second is 3 m.

The displacement of an object is the change in position of the object.

From the graph, the displacement of the object after 1 second is calculated as follows;

x = vt

where;

x = 3 x 1 = 3 m

Thus, in the velocity vs. time graph, the displacement of the object after 1 second is 3 m.

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Answer:

Dont understand question, sorry!!!

The frequency of the flute made by Mrs. Yawn is 242.9 Hz.

Wavelength is the distance between two consecutive points of a wave that are in phase, i.e., that are at the same position in their cycle. It is usually denoted by the Greek letter lambda (λ).

The relationship between wavelength and velocity is described by the wave equation:

Velocity = Wavelength x Frequency

This equation shows that the velocity of a wave is directly proportional to its wavelength and frequency. In other words, if the wavelength of a wave increases while its frequency remains constant, its velocity will also increase. Similarly, if the wavelength decreases while the frequency stays the same, the velocity will decrease.

This relationship between wavelength and velocity is important in understanding various wave phenomena, such as the Doppler effect, diffraction, and interference. It also has practical applications in fields such as acoustics, optics, and telecommunications.

Here in the Question,

The speed of sound in the room is 340 m/s, and the wavelength of the sound wave is 1.4 m. The frequency of the sound wave can be calculated using the formula:

Frequency = Speed of sound / Wavelength

Substituting the given values, we get:

Frequency = 340 m/s / 1.4 m

Frequency = 242.9 Hz (rounded to one decimal place)

Therefore, The flute Mrs. Yawn created has a 242.9 Hz frequency.

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To transform from liters to milliliters, we have to know the ratio between those units, which is 1 liter = 1000 mL. Note that we just have to multiply by 1000 to express 5 liters in milliliters.

Answer:

3

Explanation:

Answer:

if only I can help then I will help