Predict how the properties of a polymer will change if it partially or fully crystallized.

A 2.0 m tall man is 10 m in front of a camera with a 25 mm focal length lens, the height of the image on the detector is approximately 5.01 mm.

To determine the height of the image of a 2.0 m tall man who is 10 m in front of a camera with a 25 mm focal length lens, we will use the lens formula and magnification formula.

First, let's use the lens formula: 1/f = 1/u + 1/v

Here, f is the focal length, u is the object distance, and v is the image distance. We have f = 25 mm, and u = 10 m (which we need to convert to millimeters, so u = 10,000 mm).

We can now solve for v: 1/25 = 1/10,000 + 1/v

To isolate v, let's first subtract 1/10,000 from both sides: 1/25 - 1/10,000 = 1/v Now,

find the least common denominator (LCD) and subtract: (400 - 1)/10,000 = 1/v 399/10,000 = 1/v

Now, take the reciprocal of both sides to solve for v: v = 10,000/399

Now that we have the image distance (v), we can use the magnification formula to find the height of the image: magnification (m) = image height (h') / object height (h) = v / u

We want to find h', so we can rearrange the formula: h' = h * (v / u)

Plug in the known values (h = 2.0 m, u = 10,000 mm, and v = 10,000/399 mm), and convert h to mm (2.0 m = 2,000 mm): h' = 2,000 * (10,000 / 399) / 10,000 Simplify the expression: h' = 2,000 / 399

So, the height of the image on the detector when the man is 2.0m tall, 10 m in front of a camera with a 25 mm focal length lens is approximately 5.01 mm.

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Answer:5.45X10^3m

Explanation:So use the formula,v= fλ

3X10^8=5.5X10^4λ what Im saying is divide both and u should get 5454.54m but do sig figs to get answer

Answer:

5.45X10^3m

Explanation:

Answer:

The value of acceleration due to gravity is independent of mass of the body.

Explanation:

Let us consider the mass of the object as m and mass of earth as M

Therefore, force between the object and earth would be given by: F = GMm/d²

This force is equal to the weight of the object, i.e. mg

Thus;

mg = GMm/d²

g = GM/d²

Therefore, the value of acceleration due to gravity is independent of mass of the body.

Answer:

True

Explanation:

The distance of the band director, given that he hears the drumbeat in 0.40 seconds is 132 m

We'll begin by obtaining an expression for distance. This is shown below:

Speed is simply defined as distance traveled during a particular time. Mathematically, it is expressed as:

Speed = distance / time

Cross multiply

Distance = speed × time

Using the above formula, we can easily obtain the distance of the band director. This is illustrated below.

From the question given above, the following data were obtained:

Distance = speed × time

Distance of director = 330 × 0.40

Distance of director = 132 m

Thus, we conclude from the above calculation that the distance of the director is 132 m

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Answer:

Acceleration is the rate of change of velocity. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing.

The star is moving away from Earth at a velocity of 1.8 x 106 m/s.

The Doppler Effect describes the shift in wavelength of a wave when the source is moving in relation to the observer. The shift can be observed in sound waves, light waves, and other waves.

The Doppler Effect can be used to determine the velocity of objects moving away from an observer, as in the case of stars moving away from Earth.

The velocity of a star moving away from Earth can be determined using the equation:

v = Δλ/λ x c, Where v is the velocity of the star, Δλ is the shift in wavelength of the spectral line, λ is the wavelength of the spectral line measured in the lab on Earth, and c is the speed of light (3.00 x 108 m/s).

In this case, the shift in wavelength of the spectral line is Δλ = 500.3 nm - 500 nm = 0.3 nm.

The wavelength of the spectral line measured in the lab on Earth is λ = 500 nm.

Plugging in these values to the equation above: v = Δλ/λ x cv = (0.3 nm / 500 nm) x (3.00 x 108 m/s) = 1.8 x 106 m/s.

Therefore, velocity of star 1.8 x 106 m/s.

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I would need the circuit diagram or additional information about the circuit components and their values, give  general explanation of process find value of R when G shows no deflection.

When G, a galvanometer, shows no deflection in a circuit, it means that the current through the galvanometer is zero. This usually occurs when the circuit is balanced. To calculate the value of R in such a case, you will need to use Kirchhoff's laws or Ohm's law, depending on the circuit configuration. Once you have identified the appropriate method and equations, you can plug in the known values of the circuit components (such as resistances, voltages, or currents) and solve for the unknown variable, R. This will give you the value of R that results in no deflection in the galvanometer. To provide a more specific answer, please provide the circuit diagram or additional information about the circuit components and their values.

The relationship is as follows for deflection decay (in the form of current or voltage). Maximum current is denoted by i0, time is constant by, and current is denoted by i at time t.

When t = i = i0 x.3678

This indicates that the time constant is the period of time during which the current (deflection) decays to 36.78% of its greatest value.

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Batteries can be connected in either series or parallel to increase the voltage or current, respectively. When batteries are connected in series, the voltage is added together while the current remains the same. On the other hand, when batteries are connected in parallel, the current is added together while the voltage remains the same.

Batteries connected in series example, if two batteries with a voltage of 1.5V each are connected in series, the total voltage would be 3V. The current, however, would remain the same. This method is useful when the device you are powering requires a higher voltage but doesn't need more current.

Batteries connected in parallel example, if two batteries with a current of 1A each are connected in parallel, the total current would be 2A. The voltage, however, would remain the same. This method is useful when the device you are powering requires a higher current but doesn't need more voltage.

It is worth noting that when connecting batteries in series, the capacity of the batteries is not added together. The capacity is the amount of energy that can be stored in the battery. If two batteries with a capacity of 1Ah are connected in series, the total capacity would still be 1Ah. This is because the current is flowing through both batteries, and the capacity of each is being used. However, when connecting batteries in parallel, the capacity is added together. In the above example, the total capacity would be 2Ah.

Additionally, when batteries are connected in parallel, the state of charge of each battery should be similar. If one battery has a much higher state of charge than the other, the current will be drawn primarily from the battery with the higher state of charge, which can cause the battery to overheat, shorten its life and even cause damage.

In summary, connecting batteries in series will increase the voltage while keeping the current the same, while connecting batteries in parallel will increase the current while keeping the voltage the same. Both have their uses depending on the device that is being powered and the power requirements.

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The change in velocity experienced by the red ball during the collision is -1 m/s, and the change in velocity experienced by the blue ball is +1 m/s. Momentum was conserved during this collision.

Given that the red ball is initially moving at 3 m/s and the blue ball is initially moving at 2 m/s, we can determine the change in velocity for each ball after the collision.

For the red ball:

Initial velocity = 3 m/s

Final velocity = -2 m/s (since it rebounds at 2 m/s in the opposite direction)

The change in velocity for the red ball is calculated as:

Change in velocity = Final velocity - Initial velocity

Change in velocity = (-2 m/s) - (3 m/s) = -5 m/s

Therefore, the change in velocity experienced by the red ball during the collision is -5 m/s, indicating a decrease in speed by 5 m/s.

For the blue ball:

Initial velocity = 2 m/s

Final velocity = 3 m/s

The change in velocity for the blue ball is calculated as:

Change in velocity = Final velocity - Initial velocity

Change in velocity = (3 m/s) - (2 m/s) = 1 m/s

Therefore, the change in velocity experienced by the blue ball during the collision is +1 m/s, indicating an increase in speed by 1 m/s.

To determine if momentum was conserved during the collision, we need to compare the total momentum before and after the collision. Since the masses of the red and blue balls are the same, we can compare their initial and final momentum.

Before the collision:

Total momentum = (Mass of red ball * Velocity of red ball) + (Mass of blue ball * Velocity of blue ball)

Total momentum = \((m * 3 m/s) + (m * 2 m/s) = 5m\)

After the collision:

Total momentum = (Mass of red ball * Velocity of red ball) + (Mass of blue ball * Velocity of blue ball)

Total momentum = (m * -2 m/s) + (m * 3 m/s) = m

The total momentum before the collision is 5m, and after the collision, it is m. Since 5m is not equal to m, we can conclude that momentum was not conserved during this collision. The presence of a huge external force during the collision caused a change in momentum.

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A wave is a form of energy transfer that travels through a medium without causing a net displacement of the particles in the medium. Mechanical waves, which require a medium, have characteristics such as amplitude, wavelength, frequency, and speed. A sine wave is a specific type of wave that follows a mathematical function called the sine function. It is represented by the equation y = A sin (ωt + φ).

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Answer:

For an object resting upon a non-accelerating surface, the normal force is equal to the ... Suppose that a person weighs 800 N and sits at rest upon a table. ... applying a downward force of 200 N. With the additional downward force of 200 N acting upon the person, the total upward force must be 1000 N.

Explanation:

Answer:

The torque on the pulley, when the system is motionless is approximately 9.81 N·m

Explanation:

The given parameters are;

The mass of the object = 2 kg

The friction between the rope and the pulley = 0

The mass of the rope, \(m_r\) = 0.5 kg

The mass of the pulley, \(m_p\) = 0.01 kg

The radius of the pulley, r = 0.25 m

The torque on the pulley, τ = I·α = F × D

The torque on the pulley, when the system is motionless, τ = F × D

Where;

F = The force acting on the pulley rope = The weight of the mass ≈ 2 kg × 9.81 m/s² = 19.62 N

D = The diameter of the pulley = 2×r = 2 × 0.25 m = 0.5 m

Therefore;

τ = 19.62 N × 0.5 m = 9.81 N·m

The torque on the pulley, when the system is motionless, τ ≈ 9.81 N·m.

Hi there!

Recall that:

GPE = mgh

KE = 1/2mv²

At the TOP of an object's trajectory, the GPE is at a maximum. There is NO kinetic energy at this moment.

At the bottom of the fall, the KINETIC energy is at a maximum while the GPE is a minimum (assuming the ground to be the zero-line.)

We can write this out:

GPE = KE

mgh = 1/2mv²

A.

There is an 'm' on both sides, so you can divide both sides by 'm':

(mgh)/m = 1/2mv²/m

gh = 1/2v²

B.

Solve for v.

gh = 1/2v²

Multiply both sides by 2:

2gh = v²

Take the square root:

v = √2gh

C.

We can use the equation:

v = √2gh

g = acceleration due to gravity (9.8 m/s²)

h = length of fall (3.67 m)

v = velocity (m/s)

Plug in the knowns:

v = √2(9.8)(3.67) = 8.48 m/s

A Cell  is described as a device that converts chemical energy to electric energy.So,correct option is b.

A galvanic cell is a kind of electrochemical cell that is utilized to change over synthetic energy into electrical energy.Electrical energy doesn't straightforwardly switch over completely to synthetic energy. Electrolysis is the cycle by which this cooperation can occur.

In a galvanic cell, the synthetic responses happen in the inward circuit though the electrons help the electrical energy through a wire in the outer circuit.In the outer circuit, we can just utilize the created electric energy, for a light or can involve it for any electrical machine by interfacing it through a wire to the circuit.

A galvanic cell includes a synthetic response that makes the electric energy accessible.During a redox response, a galvanic cell utilizes the energy move between electrons to change over compound energy into electric energy.

Hence,correct option is b.

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Answer:

Specific heat

Explanation:

The specific heat of a substance is the amount of heat required to raise the temperature of 1g of such substance by 1K.

  Specific heat of substance depends on the nature of the substance. For most conductors of heat, specific heat value is quite low because increase in temperature is attained very fast.

But for poor conductors such as water, they have a high specific heat capacity. They do not lose nor gain heat readily. More heat must be supplied to cause a significant rise in temperature.

  The relationship;

         H  = m x c x Ф  

 shows the relationship between the amount of heat, mass , specific heat and temperature change.

         H is the amount of heat

         m is the mass

          c is the specific heat

          Ф is the temperature change

Answer:

59F

Explanation:

Given parameters:

Temperature in °C  = 15°C

Unknown:

Temperature in Fahrenheit scale  = ?

Solution:

To solve this, we use the conversion equation below;

       F  = (C x 1.8)  + 32

C is the temperature in celcius;

    F = (15 x 1.8) + 32  = 59F

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 750 × 4 = 3000

We have the final answer as

Hope this helps you

Answer:

The frequency heard is 576.78 Hz

Explanation:

The Doppler effect is defined as the apparent frequency change of a wave produced by the relative movement of the source with respect to its observer. In other words, this effect is the change in the perceived frequency of any wave motion when the sender and receiver, or observer, move relative to each other.

This is what happens in the first part of this problem, where the sender is train A and the receiver is train B. They are both moving in opposite directions. In this case, where both are in motion, the frequency perceived by the receiver will increase when receiver and transmitter increase their separation distance and will decrease whenever the separation distance between them is reduced. The following expression is considered the general case of the Doppler effect:

\(f'=f*\frac{v+-vR}{v+-vE}\)

Where:

f ', f: Frequency perceived by the receiver and frequency emitted by the issuer respectively. Its unit of measurement in the International System (S.I.) is the hertz (Hz), which is the inverse unit of the second (1 Hz = 1 s-1)

v: Velocity of propagation of the wave in the medium. It is constant and depends on the characteristics of the medium. In this case, the speed of sound in air is considered to be 343 m / s

vR, vE: Speed ​​of the receiver and the emitter respectively. Its unit of measure in the S.I. is the m / s

±, ∓:

We will use the + sign:

We will use the sign -:

In this case you are in a car traveling at 20 m/s and an ambulance is behind you traveling 35 m/s in the same direction.

In this case the receiver, you in the car, moves away from the emitter, while the emitter, the ambulance, approaches the receiver behind you in the same direction. So the frequency is calculated by the expression:

\(f'=f*\frac{v-vR}{v-vE}\)

Being:

and replacing:

\(f'=550 Hz*\frac{343 m/s-20 m/s}{343 m/s-35 m/s}\)

you get:

f'= 576.78 Hz

The frequency heard is 576.78 Hz

Answer:

c. divides by 4 the gravitational force between them

Explanation:

Newton's law of gravity says:

 F1 = G(m1*m2)/r^2

where G is the gravitational constant, m1 and m2 are the masses of objects 1 and 2, and r is the distance between the two masses.

Doubling the distance would result in:

The new distance would be = 2r

F2 = G(m1m2)/(2r)^2

F2 = G(m1m2)/4r^2

F2 = (1/4)(G(m1m2)/r^2)

F2 = (1/4)F1

The new force, F2, at twice the distance is 1/4 that of the original force, F1.

The distance between the stations is 1320 m

We'll begin by calculating the distance travelled by the train in the first 20 s. This can be obtained as follow:

s = ut + ½at²

s = (0 × 20) + (½ × 1.1 × 20²)

s = 0 + 220

s = 220 m

The distance between the stations can be obtained as illustrated below:

Total distance = 220 + 110

Total distance = 1320

Thus, the distance between both stations is 1320 m

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One significant method for assessing body fat distribution is measurement of waist circumference.

Waist circumference is a widely used method for assessing body fat distribution and is an important indicator of central obesity. It involves measuring the circumference of the waist at a specific anatomical landmark, typically at the level of the narrowest point between the ribs and the iliac crest.

The measurement of waist circumference provides valuable information about the distribution of body fat. Excess fat accumulation in the abdominal region, also known as central obesity or android obesity, is associated with a higher risk of various health conditions, including cardiovascular diseases, type 2 diabetes, and metabolic syndrome.

By measuring waist circumference, healthcare professionals can evaluate an individual's body fat distribution and assess their risk for developing obesity-related health problems.

The measurement of waist circumference is relatively simple and non-invasive, making it a practical method for assessing body fat distribution in clinical and research settings. It is often used in conjunction with other anthropometric measurements, such as body mass index (BMI), to provide a comprehensive evaluation of an individual's body composition and health status.

Regular monitoring of waist circumference can help track changes in body fat distribution over time and guide interventions aimed at reducing central obesity and improving overall health.

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The correct terms that fills the box are;

(i) The incident ray

(ii) The normal

(iii) The reflected ray

(iv) The angle of incident

(v) The reflected angle

The terms of the ray diagram is illustrated as follows;

(i) This arrow indicates the incident ray, which is known as the incoming ray.

(ii) This arrow indicates the normal, a perpendicular line to the plane of incidence.

(iii) This arrow indicates the reflected ray; the out going arrow.

(iv) This the angle of incident or incident angle.

(v) This is the reflected angle or angle of reflection.

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Answer:

To solve this problem, we need to use the formula:

distance = initial velocity x time + 1/2 x acceleration x time^2

where:

initial velocity = 72 km/hour (we need to convert this to m/s to use it in the formula)

time = 5 seconds

acceleration = 10 m/s^2 (assuming this is the acceleration due to gravity)

Converting the initial velocity from km/hour to m/s:

72 km/hour = (72 x 1000 m) / (60 x 60 s) = 20 m/s

Now we can plug in the values into the formula:

distance = 20 m/s x 5 s + 1/2 x 10 m/s^2 x (5 s)^2

distance = 100 m + 1/2 x 10 m/s^2 x 25 s^2

distance = 100 m + 125 m

distance = 225 meters

Therefore, the distance traveled by the bus in 5 seconds is 225 meters.

Answer:

gears - answer

Explanation:

Hope it helps