What mass of copper metal would absorb 250. 0KJ when it melted at its melting point

Answer:

A short circuit is an abnormal connection between two nodes of an electric circuit intended to be at different voltages. This results in an electric current limited only by the Thévenin equivalent resistance of the rest of the network which can cause circuit damage, overheating, fire or explosion.

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Answer:

A short circuit is an electrical circuit that allows a current to travel along an unintended path with no or very low electrical impedance.

The momentum of the probe after the retrorocket ceases to fire is 9.9 * 10^7 Kg m/s

We know that the momentum of an object has to do with the product of the mass and the velocity of an object. The momentum of an object is a vector quantity and the direction of the momentum is the direction of the velocity of the object that is in motion.

According to the Newton second law of motion, we know that the rate of change of the momentum is equal to the impressed force that is acting on the body.

We know that;

\(F_{t}\) = \(p_{f}\) -\(p_{i}\)

F = force

t = time taken

\(p_{f}\)= final velocity

\(p_{i}\) = initial velocity

\(p_{f}\) = \(F_{t}\)  + -\(p_{i}\)

\(p_{f}\) = (2.0 * 10^6 * 12 s) + 7.5 * 10^7

\(p_{f}\)  = 2.4 * 10^7 + 7.5 * 10^7

\(p_{f}\)  = 9.9 * 10^7 Kg m/s

Hence, the momentum of the retrorocket is 9.9 * 10^7 Kg m/s.

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Missing parts;

A  space probe is traveling in outer space with a momentum that has a magnitude of  7.5 * 10^7 kgm/s. A retrorocket is fired to slow down the probe. It applies a force to the probe that has a magnitude of 2.0  * 10^6 N and a direction opposite to the probe's motion. It fires for a period of 12 s. Determine the momentum of the probe after the retrorocket ceases fire.

Answer:

The correct answer is - 200000 J

Explanation:

We use the formula of kinetic energy:

The formula to calculate kinetic energy is,

Here,

Ec =1/2 x  m x v^2

The mass of the roller coaster is,  m  =  1000  k g

The speed of the roller coaster is, v = 20.0 m/s

 Therefore,

Ec=1/2 x 1000kg x (20m/s)^2 = 200.000Joule

200,000J

To determine the relative humidity, dew point, and lifting condensation level (LCL) for the given conditions, we can use the provided temperature and water vapor values.

Here are the calculations for each scenario:

1. Temperature: 30°F, Water Vapor: 3.5 g/kg   - Relative Humidity (RH): N/A (Need the actual vapor pressure or saturation vapor pressure)

  - Dew Point: N/A (Need the actual vapor pressure or saturation vapor pressure)   - LCL: N/A (Need the temperature and dew point)

2. Temperature: 50°F, Water Vapor: 5.70 g/kg

  - Relative Humidity (RH): N/A (Need the actual vapor pressure or saturation vapor pressure)   - Dew Point: N/A (Need the actual vapor pressure or saturation vapor pressure)

  - LCL: N/A (Need the temperature and dew point)

3. Temperature: 70°F, Water Vapor: 3.5 g/kg   - Relative Humidity (RH): N/A (Need the actual vapor pressure or saturation vapor pressure)

  - Dew Point: N/A (Need the actual vapor pressure or saturation vapor pressure)   - LCL: N/A (Need the temperature and dew point)

4. Temperature: 80°F, Water Vapor: 5.60 g/kg

  - Relative Humidity (RH): N/A (Need the actual vapor pressure or saturation vapor pressure)   - Dew Point: N/A (Need the actual vapor pressure or saturation vapor pressure)

  - LCL: N/A (Need the temperature and dew point)

5. Temperature: 80°F, Water Vapor: 11.56 g/kg   - Relative Humidity (RH): N/A (Need the actual vapor pressure or saturation vapor pressure)

  - Dew Point: N/A (Need the actual vapor pressure or saturation vapor pressure)   - LCL: N/A (Need the temperature and dew point)

6. Temperature: 30°F, Mixing Ratio: 3.5

  - Relative Humidity (RH): N/A (Need the actual vapor pressure or saturation vapor pressure)   - Dew Point: N/A (Need the actual vapor pressure or saturation vapor pressure)

  - LCL: N/A (Need the temperature and dew point)

7. Temperature: 70°F, Mixing Ratio: 8.32   - Relative Humidity (RH): N/A (Need the actual vapor pressure or saturation vapor pressure)

  - Dew Point: N/A (Need the actual vapor pressure or saturation vapor pressure)   - LCL: N/A (Need the temperature and dew point)

8. Temperature: 70°F, Mixing Ratio: 3.66

  - Relative Humidity (RH): N/A (Need the actual vapor pressure or saturation vapor pressure)   - Dew Point: N/A (Need the actual vapor pressure or saturation vapor pressure)

  - LCL: N/A (Need the temperature and dew point)

9. Temperature: 80°F, Mixing Ratio: 17.59   - Relative Humidity (RH): N/A (Need the actual vapor pressure or saturation vapor pressure)

  - Dew Point: N/A (Need the actual vapor pressure or saturation vapor pressure)   - LCL: N/A (Need the temperature and dew point)

10. Temperature: 50°F, Mixing Ratio: 6.54

   - Relative Humidity (RH): N/A (Need the actual vapor pressure or saturation vapor pressure)    - Dew Point: N/A (Need the actual vapor pressure or saturation vapor pressure)

   - LCL: N/A (Need the temperature and dew point)

To calculate the relative humidity, dew point, and LCL, we require

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Stars began to develop as the Big Bang's cloud the cosmic gas and dust began to cool, and these stars eventually coalesced to create galaxies. In such stars and in enormous stellar bursts known as supernovae.

In the instants following the Big Bang, the majority of the helium and hydrogen inside the universe were produced. Afterwards came the heavier components. A large variety of elements are created and dispersed by supernova explosions.

There was hydrogen, a little amount of helium, and a trace amount of lithium in the beginning, and at least immediately after the Big Bang and over 14 billion years ago. a total of three components. With hundreds of variations, currently there are only about 100 recognised naturally occurring elements.

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With α = .05, the two-tailed critical region for a t test using a sample of n = 20 participants would have boundaries of t < -2.093 and t > 2.093.

Explanation:

A t-test is a hypothesis test that compares the means of two sets of data.

A t-test helps to understand whether the mean value of a variable is different from a specific value or not. The following are the steps to perform a t-test:

Step 1:

Define a null and alternative hypothesis.

Step 2:

Determine the level of significance.

Step 3:

Calculate the test statistic.

Step 4:

Determine the critical value of the test statistic.

Step 5:

Decide the conclusion based on the calculated test statistic and critical value.

A critical region is a range of values that will lead to the rejection of the null hypothesis. For a two-tailed test with α = .05, the critical region would have area α/2 = .025 in each tail of the distribution.

The boundary values for a two-tailed test with 20 degrees of freedom and α = .05 can be found using a t-distribution table or a statistical software.

The critical value is t = ±2.093, which indicates that the critical region for the test would be t < -2.093 or t > 2.093.

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Answer:

2. Mathew Maury

Explanation:

2. Mathew Maury

4. Cousteau and Gagnon

Explanation:

they made the first successful scuba in 1942

A) Angular acceleration = -2.47 rad/s²

B) 23.54 seconds

C) The total distance covered = 294.23m

The number of revolutions = 62

Angular distance, θ = 62 x 2π

θ = 62 x 2 x 3.142

θ = 389.608 radians

Diameter, d = 0.86 m

Radius, r = d/2 = 0.86/2

r = 0.43m

Initial velocity, v₁ = 90 km/h = 90 x (1000/3600)

v₁ = 25 m/s

Angular velocity, w₁ = v₁ / r

w₁ = 25/0.43

w₁ = 58.14 rad/s

Final velocity, v₂ = 59 km/h = 59 x (1000/3600)

v₂ = 16.39 m/s

Angular velocity, w₂ = v₂ / r

w₂ = 16.39 / 0.43

w₂ = 38.12 rad/s

Using the equation of motion:

Angular acceleration = -2.47 rad/s²

B) Amount of time required for the car to stop if it continues to decelerate at this rate

Initial angular speed, w₁ = 58.14 rad/s

When the car stops, final angular speed, w₂ = 0 rad/s

Using the equation of motion below:

C) The total distance

Use the equation of motion below:

The total distance covered = 294.23m

Answer:

0.4 N

Explanation:

The weight mg is 8 N, so the mass is:

mg = 8 N

m = 8 N / g

m = 8 N / (10 m/s²)

m = 0.8 kg

The force needed to accelerate it to 0.5 m/s².

F = ma

F = (0.8 kg) (0.5 m/s²)

F = 0.4 N

The given statement is True.

Explanation:

A convex mirror is also known as a diverging mirror because it diverges rays of light that fall on it. It is curved outwards and has a reflective surface on its outer surface. Convex mirrors always produce virtual, erect, and diminished images of objects.

For all positions of the object, the image created by a convex mirror is virtual, upright, and smaller than the object.

The focal length of a convex mirror is negative and is one-half of its radius of curvature. A convex mirror has a focal length that is half of its radius of curvature. The image created by a convex mirror is always smaller than the object, and it is also located between the focal point and the mirror's surface when the object is positioned beyond the mirror's focal point.

Hence, a convex mirror produces a reduced real image when the object is placed far beyond its focal point (region 1).So, the given statement "a convex mirror produces a reduced real image when the object is placed far beyond its focal point (region 1)" is True.

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Answer:

The fundamental frequency at which the sound of speakers at the microphone produce constructive interference is 801.076458 Hz

Explanation:

For a given arrangement having constructive interference, we have;

R₁ - R₂ = 2·x = 0 + n·λ

The distance from one speaker to the microphone. R₁ = 4.50 m

The distance between the two speakers = 2.00 m

The angle formed between the direction from the microphone to the speaker closest and the directional path between the speakers = 90°

Therefore, by Pythagoras's theorem, the distance from the speaker furthest from the microphone, to the microphone, 'R₂' is given as follows;

R₂ = √(4.50² + 2.00²) = √(24.25) = 4.9244289009 ≈ 4.924

∴ R₂ ≈ 4.9244289 m

R₂ - R₁ = 4.9244289 m - 4.5 m = 0.4244289 m

For constructive interference, R₂ - R₁ =0.4244289 m = n·λ

For n = 1, we have;

R₂ - R₁ =0.4244289 m = n·λ = 1 × λ = λ

λ = 0.4244589 m

f = v/λ = 340 m/sec/(0.4244289 m) ≈ 801.076458 Hz

Therefore the lowest possible fundamental frequency at which the speakers produce constructive interference, f = 801.076458 Hz

The frequency at which the speakers produce a constructive interference is 801.076 Hz.

Given here,

\(R_1\)- The distance from one speaker to the first microphone = 4.5 m

\(R_2\) - The distance between microphone and second speaker = ?

The distance between the speakers = 2 m

From Pythagorean theorem,

\(R_2= \sqrt {4.50^2 + 2.00^2}\\\\R_2 = \sqrt{24.25} \\\\R_2= 4.924\)

So,

\(R_2 - R_1 = 4.9244 \, {\rm m} - 4.5 \, {\rm m} \\\\R_2 - R_1 = 0.4244 \, \rm m\)

For constructive interference,

\(R_2 - R_1 = m\lambda\)

Since, m = 1

λ = 0.4244 m

Now, frequency can be calculated by the formula,

\(f = \dfrac v\lambda\)

So,

\(f = \dfrac {340{\rm \ m/sec}}{(0.4244\; \rm m) }\\\\f = 801.076{\rm \ Hz}\)

Therefore, the frequency at which the speakers produce a constructive interference is 801.076 Hz.

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The rate at which an electric charge flows through a conductor with regard to time is what is known as the electric current.

It results from the free electrons drifting through a conductor in a specific path.

As we are all aware, the unit of measurement for electric change is the Coulomb, the unit of measurement for current is the Coulombs per second, and the logical unit of current is named Ampere in honor of the eminent French scientist André-Marie Ampere.

Current I = Q / t coulombs per second or amps if total Q Coulomb charge travels through a conductor by time t.

Therefore, The rate at which an electric charge flows through a conductor with regard to time is what is known as the electric current.

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Answer:

below

Explanation:

a= inverse

b= direct

c = inverse

d = direct

e = direct

(a) To find the force that will stretch a similar piece of wire to 1.87 cm, we can use the concept of Hooke's Law. Hooke's Law states that the force required to stretch or compress a spring (or wire) is directly proportional to the displacement or change in length.

Given that the original force is 17.0 N and it stretches the wire by 0.650 cm, we can set up a proportion to find the force required for a 1.87 cm stretch.

Let F1 be the original force, x1 be the original displacement, F2 be the unknown force, and x2 be the desired displacement. The proportion can be expressed as:

F1 / x1 = F2 / x2

Substituting the given values, we have:

17.0 N / 0.650 cm = F2 / 1.87 cm

Now we can solve for F2:

F2 = (17.0 N / 0.650 cm) * 1.87 cm

F2 ≈ 48.8 N

Therefore, a force of approximately 48.8 N will stretch a similar piece of wire to 1.87 cm.

(b) To determine how far a similar piece of wire will stretch when a force of 21.3 N is applied, we can use Hooke's Law again.

Using the same variables as before, the proportion can be set up as:

F1 / x1 = F2 / x2

Substituting the given values:

17.0 N / 0.650 cm = 21.3 N / x2

Solving for x2:

x2 = (21.3 N / 17.0 N) * 0.650 cm

x2 ≈ 0.815 cm

Therefore, a force of 21.3 N will cause the wire to stretch approximately 0.815 cm.

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Answer: A roller coaster at the top of a hill

Explanation:

Potential energy is the energy held by the object because of its position relative to other objects around it. Potential energy is the energy it is going to have (future) kinetic energy is energy that it is currently having. On a roller coaster, when the cart is on the top of the hill, it has the potential energy, when it is falling down the hill, it produces kinetic energy! Hope this helped!

When the clips of the voltmeter are switched to the opposite electrodes, the number is the same, but the sign (+ or -) is switched.

Voltmeter is an electronic device used to measure electric voltage in electronic circuits. Generally, voltmeter units are expressed in Volts, millivolts (0.001 volts), or kilovolts (1,000 volts).

In addition to the above understanding, a Voltmeter can also be defined as a tool that is made to measure the electric potential between 2 points in one system.

This measuring instrument must be installed in a parallel circuit with the ends of the resistance which will later be calculated how much the potential difference is. In this tool there are obstacles, so that when installed it will make the electric current that will pass through these obstacles be slightly reduced.

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Certainly gravity is a force that exists between the Earth and the objects that are near it. As you stand upon the Earth, you experience this force.

The magnetic force allows to find the result for the question about the characteristics of the material is:

Ampere's law explains the formation of the magnetic field due to the movement of the charges in the solenoid wire.

For the switch to move it must be a metal that is attracted by the magnetic field, to increase the force to the maximum possible it must be a metal that has many electrons with unpaired spin and these can feel the force of the magnetic field.

One of the most used metals is iron, which has 5 unpaired electrons and is the one that most feels the forces of the magnetic field.

In conclusion using the magnetic force we can find the result for the question is:

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Answer:

Explanation:

540

The approximate linear velocity of a point that sits 12 cm from the center of the record is approximately 0.4152 m/s.

To calculate the approximate linear velocity of a point on the record, we can use the formula:

Linear velocity = Angular velocity * Radius

Given:

Angular velocity = 3.46 radians per second

Radius = 12 cm (convert to meters by dividing by 100: 12/100 = 0.12 m)

Substituting these values into the formula:

Linear velocity = 3.46 * 0.12

Linear velocity = 0.4152 m/s

Therefore, the approximate linear velocity of a point that sits 12 cm from the center of the record is approximately 0.4152 m/s.

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A parallel capacitor's geometrical characteristics determine its capacitance. the separation of the plates. The capacitance reduces as the distance between the plates grows.

Farad, denoted by the letter F, is the SI unit for electrical capacitance. In large part, the unit bears the name of English physicist Micheal Faraday. The capacity of a body or thing to hold an electrical charge is often referred to as farad. The SI base units used to describe it are s4A2m-2kg-1.

They are effective at lessening voltage pulsation. The capacitor is charged in a parallel circuit when a positive voltage is applied, and it discharges when a low voltage is applied. While most electronic circuits use DC, the electricity that comes out is AC.

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Woman's overall hearing loss is 120 dB.

A threshold intensity is the minimum amount of energy required for a person to perceive a sound at a given frequency. A decibel (dB) is a unit of measurement for the intensity of sound. A gain of 1 in decibels corresponds to a 10-fold increase in intensity (sound pressure level). Therefore, the amplification of 5.0 × 1012 times the threshold intensity is equivalent to a gain of 120 dB. This means that the woman's overall hearing loss is 120 dB.

The woman's hearing loss in dB can be determined using the following formula:

Gain in dB = 10 log10 (amplification)

For an amplification of 5.0 × 1012, the gain in dB is:

Gain in dB = 10 log10 (5.0 × 1012)

                 = 10 × 12.7

                 = 127

Therefore, the amplification of 5.0 × 1012 times the threshold intensity is equivalent to a gain of 127 dB. To avoid further damage to her hearing from levels above 90 dB, smaller amplification is appropriate for more intense sounds.

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The correct answer to this question is (e) increases by 100 V. The kinetic energy of an electron is directly proportional to its potential energy, which is determined by the voltage difference between the two points.

Therefore, as the electron travels from point A to point B, it gains potential energy due to the increase in voltage. This potential energy is then converted into kinetic energy, causing the electron's speed to increase. However, the total energy of the electron (potential energy + kinetic energy) remains constant throughout the trip.

It's important to note that the voltage difference between two points is a measure of the work done by an external force to move a unit of charge from one point to another. In this case, the electron is the unit of charge being moved through free space, and the increase in voltage is due to an external source. As the electron moves from point A to point B, it gains kinetic energy due to the work done by the external force.

In summary, the correct answer to this question is (e) increases by 100 V. The kinetic energy of the electron increases as it gains potential energy due to the increase in voltage between points A and B.

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Answer: The Energy Change

Explanation: change for a chemical reaction can either be exothermic if it gives off heat or endothermic if it requires heat to proceed.  in a chemical reaction is due to the difference in the amounts of stored chemical energy between the products and the reactants. This stored chemical energy, or heat content, of the system is known as its enthalpy. energy changes that occur during a chemical reaction can be shown in a diagram called a potential energy diagram, or sometimes called a reaction progress curve. A potential energy diagram shows the change in potential energy of a system as reactants are converted into products.

The car's acceleration is -1.3 meters per the second square

To solve this, use the first equation of motion v=u+at

where, v = final velocity(meters per second )

           u = initial velocity(meters per second )

           a = acceleration(meters per second square)

           t = time (seconds)

According to the question,

Initial velocity(u) of the car = 28 meters per second

Final velocity(v) of the car  = 15 meters per second

Time  (t) = 10 seconds

Acceleration of the car(a) =?

Substituting the values in equation v =u+at

v= u+at

15 = 28 + ax10

15-28 = 10a

-13 = 10a

a = -13/10

a = -1.3 meters per second square

The car's acceleration is =  -1.3 meters per second square

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The acceleration of this car is equal to -1.3 meters per seconds square (m/s²).

Mathematically, the acceleration of this car can be calculated by using this mathematical expression:

a = (V - U)/t

Where:  

Substituting the given parameters into the acceleration formula, we have;

Acceleration, a = (15 - 28)/10

Acceleration, a = -13/10

Acceleration, a = -1.3 m/s².

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