define heat...and angle of friction?​

Answer:

the exact center of its mass

Answer:

c) the quantity that opposes inertia

Answer:

The approximate acceleration of the sled is 0.319 m/s²

Explanation:

Given;

mass of the sled, m = 90 kg

horizontal applied force, f = 258 N

angle of inclination of the force, θ = 15°

coefficient of kinetic friction of 0.250, μ = 0.25

The net vertical force on the sled is given by;

Fcosθ - μmg = ma

258Cos15 - (0.25 x 90 x 9.8) = ma

249.2 - 220.5 = ma

28.7 = ma

a = 28.7 /m

a = 28.7 / 90

a = 0.319 m/s²

Therefore, the approximate acceleration of the sled is 0.319 m/s²

Answer:

6.8ms²

Explanation:

a=v-u/t

a=57-40/2.5

a=17/2.5

a=6.8ms²

Answer:

Because the chemical energy is converted to electrical enegy in the cell phone

Explanation:

This set up is not a voilation of the first law of thermodynamics because the chemical energy is not lost, it is only being transformed into electrical energy.

According to the first law of thermodynamics "energy is neither created nor destroyed but transformed from one form to another".

It does not violate the first law of thermodynamics as the energy is being converted from one form to another.

As we use our phones, the amount of chemical energy in the battery decreases.  But it is not a violation of the first law of thermodynamics.

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Answer:

The Doppler red-shift of light observed from distant stars and galaxies gives evidence that the universe is expanding (moving away from a central point). This allows for Big Bang Theory, because after a “bang” occurs all of the matter moves away from the point of origin.

Explanation:

Okayyy.. So..

12 pounds = 26.00

1 pound=2.17

Now you have to use cross multiplication method

[tex]1 = 2.17 \\ = 18.00[/tex]

The answer is 8.3

If I'm not mistaken

Answer:

hi !

Pressure = Force/Area

Force = Pressure*Area

Pressure = 25 Pa

Area = 100 cm² = 0.01 m²

F = 25*0.01

   = 0.25 N

Explanation:

Answer:

joule

Explanation:

hop it helps give a good rate ples

Answer:

joule

Explanation:

Answer:

His average speed is through 4-6.

Explanation:

Because if you divide them both by 5 you get 4 and 6.

Answer: v = 43.98 m/s

Explanation: 22 + 15.7x1.4 = 43.98.

Hope this helps!

A strong muscular system helps you in having good health for long life.

The muscular system is made up of specialized cells called as muscle fibers.

Their main function is contractibility. Muscles are attached to bones, internal organs as well as blood vessels which make movement better.

Almost all body movement is due to muscle contraction. If your willpower is strong, it benefits your whole body both now and in the future. Will power helps us strengthen our thought in mind and the urge to keep ourselves happy and healthy.

Thus, a strong muscular system helps you in keeping healthy for long.

Learn more about muscular system.

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Answer:

D=m/v

Explanation:

1.37kg/1.3899m cube

0.9927kg meter cube

Answer:

I. The angle θ increases, and the pattern expands away from the bright center

II. The angle θ increases, and the pattern expands away from the bright center

Explanation:

The given information are;

The light used to produce a diffraction pattern = Blue light

The formula for refraction is given as follows;

d × sin(θ) = n·λ

Where;

d = The inter slit distance

θ = The angle to the maxima

n = Number to the integer next fringe

λ = Light wavelength

The wavelength of blue light is between 450 and 495 nanometers

Therefore;

I. When we switch to yellow light

The wavelength of yellow light is between 590 and 560 nanometers, which is an increase in wavelength, given that d, the inter slit distance is held constant, the angle θ increases, and the pattern expands away from the bright center

II. Decrease the slit width

When the slit width is decreased, and the wavelength remains the same, the angle θ increases, and the pattern expands away from the bright center.

Answer:

Hysteresis, Eddy current, flux leakage and resistance of winding are those four reasons. It is impossible to overcome this four reasons, Hence transformer never be 100% efficient.

Answer:

6.6 Meters = 660 Meters

Explanation:

1 Meter = 100 Centimeters

It will need a force acceleration

Answer:

Independant Variable

Answer:

Rarefaction (I think so..)

The part of a longitudinal wave where the particles are spread apart is called a  rarefactions.

Longitudinal waves are waves in which the displacement of the medium is in the same (or the opposite) direction as the wave propagation and the medium vibration is parallel ("along") to the direction the wave travels.

Because they create compression and rarefaction when passing through a material, mechanical longitudinal waves are also known as compressional or compression waves. They are also known as pressure waves because they cause pressure changes.

The  part of a longitudinal wave where the particles are spread apart is called a rarefactions and the  part of a longitudinal wave where the particles are closed together is called a compression.

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Answer:

open system

Explanation:

The open system type of system is the ocean option (C) open system is correct.

It is defined as the energy that continuously comes from the sun. As we know, the sun is the greatest source of energy. The sun's radiation reaches the earth and can be utilized as heat energy.

The question is incomplete.

The complete question is:

Solar radiation is absorbed by the ocean. The absorbed energy evaporates water from the ocean. As water vapor (mass) enters the atmosphere it carries with it the heat used to evaporate the water and raises the air's humidity. What type of system is the ocean?

As we know,

An open system is one that responds to the movement of information, energy, and/or material between both the and its surroundings.

Thus, the open system type of system is the ocean if the water vapor (mass) enters the atmosphere it carries with it the heat used to evaporate the water and raises the air's humidity.

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Answer:

Friction !!!

Explanation:

Answer:

Element is the answer ok

Answer:

0.70+2.4=23.7+35.0=answer

Explanation:

Answer:

First Question:

If the initial velocity is horizontal: It doesn't really matter how fast it is going horizontally if we want to calculate time.

Since it rolled off the table, the initial vertical velocity is 0. The displacement will be -0.7 meters since the table is 0.7 meters high. The acceleration will be -9.8 m/s^2 because that's just earth's gravity.

We can plug the variables into the formula Displacement = Initial Velocity*Time + 1/2*Acceleration*Time^2:

[tex]-0.7 = 0\cdot t + 1/2\cdot-9.8\cdot t^2\\-0.7 = -4.9*t^2\\t^2 = \frac{10}{7} \\t = \sqrt{\frac{10}{7}}[/tex]

Rounded to the nearest hundredths, the answer is 1.2 seconds.

Second Question:

We can use the horizontal variables to find out the time to solve for the vertical velocity.

The acceleration is going to be 0(assuming no air resistance), the initial velocity is going to be 23.7 m/s, and the displacement is going to be 35.0 meters.

Again, we can plug the variables into the formula Displacement = Initial Velocity*Time + 1/2*Acceleration*Time^2:

[tex]35 = 23.7\cdot t + 1/2\cdot 0\cdot t^2\\35 = 23.7\cdot t\\t = \frac{35}{23.7}[/tex]

Rounded to the nearest hundredth, t = 1.48.

Now, we're going to find the vertical variables:

The acceleration will be -9.8 m/s^2 because that's just earth's gravity. The initial velocity will be 0 because the rock was launched horizontally. The time, as calculated before, is 1.48.

Now, we can plug t into the formula Velocity = Initial Velocity + Acceleration *Time:

[tex]v = 0 + -9.8\cdot1.48\\v = -14.504[/tex]

Rounded to the nearest hundredth, the answer is -14.5 meters per second.

Third Question:

Let's find the horizontal variables:

Assuming no air resistance, the final velocity is 205 m/s. The initial velocity will also be 205 m/s. The time will be 6.5 seconds.

We can use the formula Displacement = (Final Velocity+Initial Velocity)/2 * Time. In this case, the final velocity and the initial velocity are the same, so the formula reduces to Displacement = Final Velocity * Time:

[tex]d = 205\cdot6.5\\d = 1332.5[/tex]

Therefore, the answer is 1332 meters.

I really hoped this helped you because I spent more than 1 hour explaining. If you have more questions don't hesitate to ask. If it helped you, please consider giving me brainliest? :)

Answer:

1) T ≈ 50.318°C

2) It is due to the variation of the molar heat capacity of solid copper with temperature

3) The entropy introduced in the one mole of copper at 0°C is 4.146 J/K

The entropy introduced in the second mole of copper at 100°C is -3.548 J/K.

Explanation:

1) The given parameters are;

The temperature of 1 mole of copper = 0°C

The temperature of the second mole of copper 100°C

The specific heat capacity of copper = 22.64 + 6.28 × 10⁻³·T J/(mole·K)

The heat gained by the copper at 0° = The heat lost by the one mole of copper at 100°C

The total heat gained and lost is given as follows;

[tex]\int\limits^{T_f}_{273} {c_p} \, dT= -\int\limits^{T_f}_{373} {c_p} \, dT[/tex]

[tex]\int\limits^{T_f}_{273} {22.64 + 6.28 \times 10^{-3}\cdot T} \, dT= -\int\limits^{T_f}_{373} {22.64 + 6.28 \times 10^{-3}\cdot T} \, dT[/tex]

22.64·([tex]T_f[/tex] - 273) +  (6.28 × 10⁻³)/2×([tex]T^2_f[/tex] - 273²) = - 22.64·([tex]T_f[/tex] - 373) -  (6.28 × 10⁻³)/2×([tex]T^2_f[/tex]  - 373²)

Which gives;

0.00314 × [tex]T^2_f[/tex] + 22.64 × [tex]T_f[/tex] - 6414.74 = -0.00314 × [tex]T^2_f[/tex] - 22.64 × [tex]T_f[/tex] + 8881.59

Transferring the right hand side of the equation to the left and collecting the like terms gives approximately;

0.00628× [tex]T^2_f[/tex] + 45.28 × [tex]T_f[/tex] - 15296.33 = 0

Factoring with a graphing calculator, gives;

(T + 7533.509)·(T - 323.318)×0.00628 = 0

∴ T = 323.318 K ≈ 50.318°C

2) The common uniform temperature is not exactly 50°C because the hotter second mole of copper had a higher specific heat capacity, which resulted in the temperature at equilibrium being slightly higher than the average temperature

3) The amount of thermal energy transferred is given as follows;

22.64·(323.318 - 273) +  (6.28 × 10⁻³)/2×(323.318² - 273²) ≈ 1233.42 J

4) For the mole at 0°C, we have;

[tex]\Delta S_1 = \dfrac{\Delta Q}{T} =\int\limits^{323.318}_{273} { \left (\dfrac{22.64}{T} + 6.28 \times 10^{-3} \right)} \, dT\\\\\\\Delta S_1 = 22.64 \times ln \left ( \dfrac{323.318}{273} \right ) + 6.28 \times 10^{-3} \times (323.218 - 273) = 4.146 \ J/K[/tex]

The entropy introduced in the one mole of copper at 0°C, ΔS₁ = 4.146 J/K

For the mole at 100°C, we have;

[tex]\Delta S_2 = \dfrac{\Delta Q}{T} =\int\limits^{323.318}_{373} { \left (\dfrac{22.64}{T} + 6.28 \times 10^{-3} \right)} \, dT\\\\\\\Delta S_2 = 22.64 \times ln \left ( \dfrac{323.318}{373} \right ) + 6.28 \times 10^{-3} \times (323.218 - 373) = -3.548 \ J/K[/tex]

The entropy introduced in the second mole of copper at 100°C, ΔS₂ = -3.548 J/K.

Answer:

The ball continued moving in the same direction and its speed increased.

When John kicked the ball, this was an example of motion. The ball's force increased because the ball got force from John's leg. So, the answer is option A.

Hope this helps you!