Calculate the specific heat
of copper is 385 j/kg . °c.
find the change in thermal
energy for a copper pipe
with a mass of 8 kg when it
is heated from 12°c to 21°c.
show your work.

The number of mole of C that you have, given that that you have 7.77×10²⁴ atoms is 12.90 moles

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

The number of mole of C can be obtained as illustrated below:

From Avogadro's hypothesis,

6.022×10²³ atoms = 1 mole of C

Therefore,

7.77×10²⁴ atoms = (7.77×10²⁴ atoms 1 mole of C) / 6.022×10²³ atoms

7.77×10²⁴ atoms = 12.90 moles of C

Thus, the number of mole of C is 12.90 moles

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The first mass with a smaller mass would reach the bottom first due to its greater acceleration and less resistance from friction.

According to Newton's second law of motion, the acceleration of an object is directly proportional to the force applied on it and inversely proportional to its mass. Therefore, the object with the smaller mass would experience a greater acceleration than the object with the larger mass. In the scenario presented in the question, both masses are sliding down the same inclined surface with the same length and inclination. However, since the first object has a smaller mass, it would experience a greater acceleration and would therefore reach the bottom first.

Moreover, since the inclined surface is described as rough, there would be friction acting against the motion of the masses, slowing them down. However, the frictional force is also directly proportional to the normal force acting on the object. The normal force is the force exerted by the surface perpendicular to the object's surface. Therefore, the larger object would experience a greater normal force and consequently a greater frictional force, further slowing it down.

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Passive solar energy involves using natural processes to capture and distribute the Sun's energy.

This technique utilizes building design features, such as window placement and materials, to allow sunlight to enter the space and provide heating, lighting, and ventilation without any need for mechanical or electrical systems.

One example of passive solar design is the use of south-facing windows to capture sunlight during the winter, while shading devices prevent overheating during the summer.

By reducing the need for artificial heating and cooling, passive solar energy can reduce energy costs and environmental impact while providing a comfortable and sustainable living or working space.

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The time it will take the radio signal to travel from Earth to the spaceship is 36,500 seconds.

The time it will take the radio signal to travel from Earth to the spaceship is calculated as follows;

t = d/v

where;

The time taken for the signal to travel is calculated as follows;

t = (7.3 x 10¹⁰ m ) / (2 x 10⁶ m/s )

t = 36,500 seconds

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It would take approximately 4.4 hours for the person to radiate away the energy gained by eating the ice cream cone.

To calculate the time required for a person to radiate away the energy gained by eating an ice cream cone, we need to use the Stefan-Boltzmann law, which states that the rate of heat transfer from an object is proportional to the fourth power of its temperature and its surface area.

The formula is given as: Q/t = εσA([tex]T^{4}[/tex] - [tex]T0^{4}[/tex])

where Q is the heat energy gained by eating the ice cream, t is the time taken to radiate it away, ε is the emissivity of the skin, σ is the Stefan-Boltzmann constant, A is the surface area of the skin, T is the skin temperature, and T0 is the temperature of the surroundings.

Plugging in the given values, we get: 335,000 J/t = 0.915 x 5.67 x [tex]10^{-8}[/tex] x 1.27 x ([tex]373.2^{4}[/tex] - [tex]296.4^{4}[/tex])

Solving for t, we get t ≈ 4.4 hours.

Therefore, it would take approximately 4.4 hours for the person to radiate away the energy gained by eating the ice cream cone.

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Answer:

3.6 MJ

Explanation:

1 kWh = 1 MJ

Remember that this is the same as the equation Power×time = Energy

Step 1: Convert kWh (kiloWatt×hour) to Ws (Watt×second)

1 kW = 1000 Watt

1 h = 60 min×60 sec = 3600 seconds

1000 W×3600s = 3600000 Joules

Divide 3600000 J by 10^6 to get 3.6 Mega Joules

The volume of wire can be calculated as follows:

V_wire = πr²l

where r is the radius of the wire, and l is the length of the wire.

Substituting the given values, we get:

V_wire = π(3.0 mm)²(200 m) = 1.8 x 10⁶ mm³

To calculate the radius of the sphere, we need to use the formula for the volume of a sphere:

V_sphere = (4/3)πr³

Equating the volume of the wire to the volume of the sphere, we get:

(4/3)πr³ = 1.8 x 10⁶ mm³

Solving for r, we get:

r = (3V_wire/4π)^(1/3)

r = [(3 x 1.8 x 10⁶)/(4π)]^(1/3)

r ≈ 20.15 m

Therefore, the radius of the sphere is approximately 20.15 meters.

Isabela's acceleration was [tex]0.8 m/s^2[/tex]. We can use the following formula to find the acceleration:

a = (vf - vi) / t

where

a is the acceleration,

vf is the final velocity,

vi is the initial velocity, and

t is the time interval.

Using the given values:

vi = 3 m/s

vf = 5.4 m/s

t = 5 s - 2 s

 = 3 s

a = (5.4 m/s - 3 m/s) / 3 s

a = 0.8 [tex]m/s^2[/tex]

Therefore, Isabela's acceleration was 0.8 [tex]m/s^2[/tex].

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The copper cable's smallest possible cross-sectional area is 1.54 x 10-6 square meters.

To calculate the smallest cross-sectional area of the copper cable, we can use the formula for resistance:

R = ρ(L/A),

where R is the resistance (in ohms), ρ is the resistivity of the material (in ohm meters), L is the length of the conductor (in meters), and A is the cross-sectional area (in square meters).

Given the maximum allowable resistance (R) is 0.01 ohms per meter (one-hundredth of an ohm per meter) and the resistivity of copper (ρ) is 1.54 x 10^-8 ohm meters. Let's calculate the smallest cross-sectional area (A) that can be used.

First, we'll rewrite the formula for A:

A = ρ(L/R).

Since R is given as ohms per meter, we can set L to 1 meter for simplicity, and the formula becomes:

A = ρ(1/R).

Now, we can plug in the given values:

A = (1.54 x 10^-8)/(0.01).

A = 1.54 x 10^-6 square meters.

So, the smallest cross-sectional area of the copper cable that could be used is 1.54 x 10^-6 square meters.

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The probability of each possible sample is (sample) = 1/495. The probability of each possible sample is P(sample) = 1/28,544.

(a) The probability of each possible sample of size n=4 being drawn from a finite population of size N=12 can be calculated using the formula:

P(sample) = (number of ways to choose the sample) / (total number of possible samples)

The number of ways to choose a sample of size 4 from a population of size 12 is:

C(12,4) = 12! / (4! * 8!) = 495

The total number of possible samples of size 4 from a population of size 12 is:

C(12,4) = 495

Therefore, the probability of each possible sample is:

P(sample) = 1/495

(b) The probability of each possible sample of size n=5 being drawn from a finite population of size N=22 can be calculated using the same formula:

P(sample) = (number of ways to choose the sample) / (total number of possible samples)

The number of ways to choose a sample of size 5 from a population of size 22 is:

C(22,5) = 22! / (5! * 17!) = 28,544

The total number of possible samples of size 5 from a population of size 22 is:

C(22,5) = 28,544

Therefore, the probability of each possible sample is:

P(sample) = 1/28,544

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Answer:

vii. c

ix. a

x. d

Explanation:

trust

The maximum speed of a point on the outside of the wheel 15 cm from the axle would depend on the rotational speed of the wheel.

To calculate the maximum speed, we need to know the angular velocity of the wheel, which is the rate at which it rotates. If we assume that the wheel is rotating at a constant angular velocity, we can use the formula v = rω, where v is the linear velocity of the point on the outside of the wheel, r is the radius of the wheel (15 cm in this case), and ω is the angular velocity of the wheel in radians per second.

So, if we know the angular velocity of the wheel, we can plug it into this formula and calculate the maximum speed of a point on the outside of the wheel 15 cm from the axle.

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According to the question the angular velocity of OA when it reaches the vertical position is given by ω.

Velocity is a measure of the rate of change in the position of an object over time. It is a vector quantity, meaning it has both magnitude (or length) and direction. Velocity is the speed of an object in a given direction. It is calculated by dividing the distance traveled by the time taken to travel that distance.

Let ω be the angular velocity of OA when it reaches the vertical position.

The angular momentum of the system about the center of mass G is given by:

[tex]L_G = I_G \omega + M[/tex]

where [tex]I_G[/tex] is the moment of inertia of the crank OA about G.

The moment of inertia of the crank OA about G is given by:

[tex]I_G = m_oa r_o^2 + m_ab l^2[/tex]

where [tex]m_{oa[/tex] is the mass of the crank OA, l is the length of the uniform slender bar AB, and [tex]r_o[/tex] is the radius of gyration of the crank OA about O.

The angular momentum of the system about the center of mass G due to the 12-kg uniform slender bar AB is given by:

[tex]L_G = m_{ab} v l[/tex]

where v is the speed of point B when OA swings through the vertical position.

By equating the two angular momentum equations, we have:

[tex]m_oa r_o^2 \omega + M = m_{ab} v l[/tex]

Rearranging the above equation, we obtain:

[tex]M = m_oa r_o^2 \omega + m_ab v l[/tex]

Substituting known values, we get:

[tex]M = 8 kg \times (0.22 m)^2 \times \omega + 12 kg \times 8 m/s \times 1 m[/tex]

[tex]M = 1.76 kg m^2/s^2 \omega + 96 kg m/s^2[/tex]

Thus, the magnitude of the torque M is given by:

[tex]M = 1.76 kg m^2/s^2 \omega + 96 kg m/s^2[/tex]

The angular velocity of OA when it reaches the vertical position is given by:

[tex]\omega = (M - 96 kg m/s^2) / (1.76 kg m^2/s^2)[/tex]

Substituting the known value for M, we get:

[tex]\omega = (1.76 kg m^2/s^2 \omega + 96 kg m/s^2 - 96 kg m/s^2) / (1.76 kg m^2/s^2)\\\omega = 1.76 kg m^2/s^2 \omega / 1.76 kg m^2/s^2\\\omega = \omega[/tex]

Hence, the angular velocity of OA when it reaches the vertical position is given by ω.

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it takes a light from a flash camera to reach a subject 6.0 meters across a room in scientific notation is 2.0 *10^-8 seconds.

we apply the  equation shown below:

v=d/t

where t= time

d = distance

v = velocity

Therefore  time =distance /velocity

distance =6m

v=3*10^8 m/s

time =6m/3*10^8 m/s

time =2*10^-8 seconds

Therefore,  the time it takes light from a flash camera to reach a subject 6.0 meters across a room in scientific notation is 2.0 *10^-8 seconds

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Within 20 nanoseconds, photo subjects standing at a distance of 6.0 metres receive the flash from the camera.

The speed of light, a rate equal to an estimated 3 x 10^8 meters per second, determines the amount of time it takes for light to travel from the flash camera's source to a subject standing six meters away.

Employing the formula

Speed = distance / time

Then

time = distance / speed

where

distance  = 6.0 meters and

speed = 3 x 10^8

time = 6.0 / 3 x 10^8

time = 2 x 10^-8

time = 20.0 nanoseconds

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The second pile driver must be raised to a height of 1.5m.

Assume the mass of the first pile driver is m and its height is h. Therefore, the potential energy (PE) of the first pile driver is given by:

PE1 = m * g * h

where g is the acceleration due to gravity.

Now, let's find the potential energy of the second pile driver, which has twice the mass of the first pile driver. The mass of the second pile driver is 2m.

To have the same amount of potential energy as the first pile driver, the second pile driver must be raised to a certain height, let's call it h2.

Therefore, the potential energy (PE2) of the second pile driver is given by:

PE2 = (2m) * g * h2

Since we want the potential energy of both pile drivers to be equal, we can set up an equation:

PE1 = PE2

m * g * h = (2m) * g * h2

We can cancel out the mass and acceleration due to gravity:

h = 2 * h2

Now we can solve for h2:

h2 = h / 2

Plugging in the value of h as 3.0m, we have:

h2 = 3.0m / 2

h2 = 1.5m

Therefore, the second pile driver, with twice the mass of the first pile driver, must be raised to a height of 1.5m in order to have the same amount of potential energy.

Here's a visual representation of the work:

First pile driver:

Potential energy (PE1) = m * g * h

Second pile driver:

Potential energy (PE2) = (2m) * g * h2

Since PE1 = PE2, we have m * g * h = (2m) * g * h2

Cancelling out mass and acceleration due to gravity, we get h = 2 * h2

Solving for h2, we find h2 = h / 2

Plugging in the value of h, we have

h2 = 3.0m / 2

    = 1.5m

Therefore, the second pile driver must be raised to a height of 1.5m.

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The student in the problem was 86 m from the speaker

The speed of sound in air depends on various factors such as temperature, humidity, and pressure. At standard temperature and pressure (STP), which is a temperature of 0°C and a pressure of 1 atm, the speed of sound in dry air is approximately 343 meters per second

We know that;

V = 2x/t

v = speed of sound in air

x = distance covered

t = time taken

Then;

x = Vt/2

x = 343 * 0.5/2

x = 86 m

This is the sped of the sound.

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The latitude that receives the most direct rays of the sun year-round is the equator, which has a latitude of 0 degrees.

Due to the Earth's axial tilt, the sun's rays strike the Earth at different angles at various latitudes throughout the year. Near the equator, the sun's rays are nearly perpendicular to the Earth's surface, resulting in a more direct and intense sunlight.

At the equator, the sun is positioned directly overhead at least once a year during the equinoxes (around March 21st and September 21st). This means that the equator receives the most direct and concentrated sunlight throughout the year compared to other latitudes.

As one moves away from the equator towards higher latitudes, the angle at which the sun's rays hit the Earth becomes progressively steeper, resulting in less direct and more diffuse sunlight. This is why regions closer to the poles experience more significant variations in daylight and seasonal changes in sunlight intensity.

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