The siren of a police car at rest emits at a frequency of 'f'
Hz. What frequency will you hear if you are at rest and the police
car moves at speed 'v' toward you? (Proof, derive, the formula
needed t

Answer:

False because free-body diagram is a sketch of only the object in question and the forces acting upon it, to scale.

Answer:

  large-scale natural disasters

Explanation:

The niceties of civilization are generally unavailable over wide areas when they are affected by ...

Such situations often require rescue workers.

Situations such as:

First, we wonder, who are rescue workers? Basically speaking, a rescue worker is anyone who is trained to bring people out of any harm, danger, or threat that may come their way.

|n such emergency situations, power lines are usually down, and so it may be difficult for them to get the energy needed to power their  electrical devices.

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Answer:

Area = 20 m²

Explanation:

Given the following data;

Force = 2500 N

Pressure = 125 Pa

To find the area on which it rest;

Mathematically, pressure is given by the formula;

\( Pressure = \frac {Force}{area} \)

Making area the subject of formula, we have;

\( Area = \frac {Force}{pressure} \)

Substituting into the formula, we have;

\( Area = \frac {2500}{125} \)

Area = 20 m²

In a melting profile for DNA, the absorbance at 260 nm increases as a result of the disruption of the DNA structure. Denaturation is the fundamental physical basis for the absorbance increase

As a result of denaturation, many of the weak connections or bonds (such as hydrogen bonds) that give proteins their highly organized structure in their native (natural) state are broken. Most denatured proteins are insoluble and have a looser, more erratic structure.

Denaturation is the term used to describe how a protein unfolds or fragments, changing its typical three-dimensional structure. A protein's polypeptide chains may become disordered or unfurl due to chemical reaction, heat, or agitation, rendering the molecule normally non-functional. Egg whites are a perfect example of a denaturation that has been denaturized.

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Answer: thanks for the point

Explanation:

Answer:

condensation, the process of changing from a gas to a liquid

Answer:

The new force becomes 3 times of the initial force.

Explanation:

Let q₁ and q₂ are two charged particles. The force between them is given by :

\(F=\dfrac{kq_1q_2}{r^2}\ ......(1)\)

If \(q_1'=\dfrac{q_1}{4}\)

and

\(q_2'=3q_2\)

Also, r' = r/2

New force,

\(F'=\dfrac{kq_1'q_2'}{r'^2}\)

Putting all the above values,

\(F'=\dfrac{k\dfrac{q_1}{4}3q_2}{(r/2)^2}\\\\F'=3\times \dfrac{kq_1q_2}{r^2}\\\\F'=3F\)

So, the new force becomes 3 times of the initial force.

The speed of the raft when the 40 kg boy dives horizontally off it at a speed of 4.0 m/s is 0.60 m/s.

According to the law of conservation of momentum, the total momentum before the boy jumps off the raft is equal to the total momentum after he jumps off. The momentum of an object is given by the product of its mass and velocity.

Let the initial velocity of the raft be v (which is what we need to find), and the final velocity of the boy be v_boy = 4.0 m/s. The mass of the boy is 40 kg, and the mass of the raft is 600 kg.

Before the boy jumps off, the total momentum is the sum of the momentum of the boy and the momentum of the raft. After the boy jumps off, the momentum of the boy becomes zero, and only the momentum of the raft remains.

The initial momentum is given by the product of the mass and velocity of the boy: momentum_initial = 40 kg * 4.0 m/s.

The final momentum is the product of the mass and velocity of the raft: momentum_final = 600 kg * v.

Since momentum is conserved, we can equate the initial momentum to the final momentum: momentum_initial = momentum_final.

40 kg * 4.0 m/s = 600 kg * v.

Simplifying the equation, we find: v = (40 kg * 4.0 m/s) / 600 kg.

Calculating this, we get v ≈ 0.2667 m/s, which can be rounded to 0.26 m/s.

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Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

\(k = \frac{1}{2} m {v}^{2} \\ \)

m is the mass in kg

v is the velocity in m/s

From the question

m = 20 kg

v = 2.5 m/s

From the question we have

\(k = \frac{1}{2} \times 20 \times {2.5}^{2} \\ = 10 \times 6.25 \\ = 62.5\: \: \: \: \: \: \: \: \: \: \)

We have the final answer as

Hope this helps you

Answer:

Firstly, we can state that the net force is the sum of all forces acting upon the object. Since the object is stationary, by Newton's First Law we can conclude that the sum of all forces acting upon a stationary object is 0 because there are no forces acting upon the object.

Explanation:

Please support my answer.

English:

The piece of plastic most likely cooled.

/

Español:

Lo más probable es que la pieza de plástico se haya enfriado.

Answer:heart

The hardest working muscle is the heart. It pumps out 2 ounces (71 grams) of blood at every heartbeat. Daily the heart pumps at least 2,500 gallons (9,450 liters) of blood. The heart has the ability to beat over 3 billion times in a person's life.

Explanation:hope this helps

Answer:

the unit of force in the centimeter-gram-second system equal to the force that would give a free mass of one gram an acceleration of one centimeter per second per second.Explanation:hope its a good answer

The tension in the rope is greater than 525 N, thus, the rope is in danger of breaking.

The bucket started at rest, and after being lifted 3.0 m, it is moving at 3.0 m/s, the acceleration is calculated as follows;

v² = u² + 2as

v² = 0 + 2as

3² = 2(3)a

9 = 6a

9/6 = a

1.5 m/s² = a

T = m(a + g)

T = 50 (1.5 + 9.81)

T = 565.5

T ≈ 570 N

The tension in the rope is greater than 525 N, thus, the rope is in danger of breaking.

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The statement "When inserting an element into a partially-filled array, it is an error if size < capacity" is true. When inserting an element into a partially-filled array, it is an error if size < capacity.How to insert a value into a partially-filled array?

The array should be traversed starting from the right end, where the last value has been placed, until the position of the insertion value is found. If the value is less than or equal to the value at the current position, move one space to the left. Insert the value in the position to the right of the current position when it is greater than the value at the current position. If the insertion position is the same as the array capacity, the value can be inserted at that location.The insertion of the element into the partially filled array shifts all the elements that come after the insertion position to the right. If the element is to be inserted at index k, and the current elements at positions k to size-1, they will be moved to k+1 to size.If the deletion of an element is to be performed in a partially filled array, it is an error if the index of the element to be removed is greater than or equal to the size of the array. The elements will be shifted to the right to fill the vacant position when an element is deleted.The following are true for a partially-filled array:In a partially-filled array, the capacity represents the effective size of the array.In a partially-filled array, all of the elements are not required to contain meaningful values.In a partially-filled array, the size represents the allocated size of the array.The number of elements that are in use is represented by the capacity in a partially-filled array.

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To find the magnitude of the tangential acceleration of a bug on the rim of a 13.0-inch-diameter disk, we can use the following formula:

tangential acceleration (a_t) = radius (r) × angular acceleration (α)

First, we need to convert the diameter to radius and convert inches to meters:

r = (13.0 in / 2) × 0.0254 m/in ≈ 0.1651 m

Next, we need to find the angular acceleration (α). To do this, we can use the formula:

α = (final angular velocity (ω_f) - initial angular velocity (ω_i)) / time (t)

First, convert the final angular speed from rev/min to rad/s:

ω_f = 80.0 rev/min × (2π rad/rev) × (1 min/60 s) ≈ 8.3776 rad/s

Since the disk starts from rest, ω_i = 0. Now, we can calculate α:

α = (8.3776 rad/s - 0 rad/s) / 3.60 s ≈ 2.3271 rad/s²

Finally, we can find the tangential acceleration:

a_t = 0.1651 m × 2.3271 rad/s² ≈ 0.3840 m/s²

So, the magnitude of the tangential acceleration of the bug on the rim is approximately 0.3840 m/s².

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1. 44.1 J is the kinetic energy in joules when it hits the ground

2.0.075 kg   is its mass.

3.11.8 m is distance was the load lifted.

The kinetic energy of a freely falling object can be calculated using the formula KE = 1/2 * m * v^2, where m is the mass of the object and v is its velocity. At the moment of impact with the ground, the velocity of the 2-kg ball can be calculated.

using the formula v = sqrt(2 * g * h), where g is the acceleration due to gravity (9.8 m/s^2) and h is the height fallen. Substituting the values, we get KE = 1/2 * 2 kg * (sqrt(2 * 9.8 m/s^2 * 3 m))^2 = 44.1 J.

The kinetic energy of a moving object can be calculated using the formula KE = 1/2 * m * v^2. We can rearrange this formula to find the mass, m = 2 * KE / v^2. Substituting the given values, we get m = 2 * 900 J / (600 m/s)^2 = 0.075 kg.

The work done by the crane can be calculated using the formula W = F * d, where F is the force exerted by the crane and d is the distance the load is lifted. The force exerted can be calculated using the formula F = m * g, where m is the mass of the load and g is the acceleration due to gravity.

The work done can be calculated as W = m * g * d. We can rearrange this formula to find the distance lifted, d = W / (m * g). Substituting the given values, we get d = (8 hp * 746 W/hp * 15 s) / (100 kg * 9.8 m/s^2) = 11.8 m.

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Answer:

answer is 700 joules

Explanation:

work is equal to force into displacement

W=12.5*56

700 joules

Answer: B. Muscular fitness training increases muscle mass, which increases your metabolism

Answer:

B) a leaf blown from a tree by the wind

Answer:

the answer is B A leaf being blown from a tree by the ground

The orbit of the Moon is inclined relative to the ecliptic plane.

The ecliptic is the plane defined by the Earth's orbit around the Sun. It serves as a reference for the apparent path of the Sun across the sky throughout the year. The Moon's orbit, on the other hand, is tilted or inclined with respect to the ecliptic plane. This inclination causes the Moon to have varying positions above or below the ecliptic at different points in its orbit.

The Moon's orbital inclination is approximately 5.14 degrees relative to the ecliptic plane. This means that the Moon's orbit is not perfectly aligned with the plane of Earth's orbit around the Sun. As a result, the Moon's path in the sky can deviate from the ecliptic, sometimes appearing higher and sometimes lower.

This inclination of the Moon's orbit plays a significant role in determining when and where lunar eclipses occur. Since the Moon's orbit intersects the ecliptic plane at two points called the lunar nodes, eclipses can occur when the Moon is in the vicinity of these nodes during a full moon or new moon.

In summary, the Moon's orbit is inclined relative to the ecliptic plane, causing it to have varying positions above or below the ecliptic throughout its orbital journey around the Earth.

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True. A zoom lens is a lens that has a variable focal length, which allows the photographer to zoom in or out by adjusting the lens.

The focal length of a lens is the distance between the lens and the camera’s image sensor when the lens is focused at infinity. A focal length of 75mm to 150mm would be considered a telephoto zoom lens, which is commonly used for portrait photography, sports, and wildlife photography. The longer the focal length, the narrower the angle of view, which means that the photographer can capture distant objects in greater detail. However, a longer focal length also means that the lens will be heavier and more expensive. It is important to note that not all zoom lenses have the same range of focal lengths, and some lenses may have a fixed focal length.

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The force F1 is equal and opposite to the downward force thus, F1 is equal to 60 N. The force F2 is inclined to 30 ° from leftward force and it is equal to 38.97 N in magnitude.

Force is an external agent acting on a body to deform it or to change its state of motion or rest. Force is a vector quantity and it is characterised by its magnitude and direction.

If two forces acting on a body from the same directions, then the net force will be the sum of these two forces. If they are acting from opposite directions, they will cancel each other in magnitude.

The force F1 is equal and opposite to the force acting downward. Thus its magnitude is 60 N. The force F2 is inclined to 30 ° from horizontal direction.

F2 = 45 cos 30 = 38.9 N.

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Answer:

C

Explanation:

The lungs and heart are organs

Explanation:

this might help you i think so

Answer:

1. Weathering is the general term applied to the combined action of all processes that cause rock to disintegrate physically and decompose chemically because of exposure near the Earth's surface through the elements of “weather” such as temperature, rainfall, frost, fog and ice.

2. Plant and animal life, atmosphere and water are the major causes of weathering. Weathering breaks down and loosens the surface minerals of rock so they can be transported away by agents of erosion such as water, wind and ice.

The correct answer is A. Larger diameter tires because they have more friction so you won't slide off the road.

When a vehicle is moving at high speeds, the centripetal force on the tires can be very high, causing stress on the tires. One way to reduce this stress is by using larger diameter tires. Larger diameter tires have a larger contact area with the road, which increases the amount of friction between the tire and the road. This increased friction helps to prevent the tires from sliding off the road, reducing the stress on the tires. Additionally, larger diameter tires also have a larger circumference, which means that they can cover more distance with each rotation, reducing the number of rotations needed to travel a given distance and thereby reducing the stress on the tires.

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