suppose the internal energy of a system of gas changes by -167 j while it does 248 j of work on the environment. calculate the energy transfer by heat, where it is positive going into the system and negative leaving the system.

Answer:

9758 how many significant figures

Answer:

Q = 78375 [J]

Explanation:

To solve this problem we must use the following ideal equation for the thermal energy of an element or substance depending on the temperature change.

\(Q=m*C_{p}*(T_{final}-T_{initial})\)

where:

Q = heat [J]

m = mass = 0.25 [kg]

Cp = specific heat = 4180 [J/kg*C]

Tinitial = 25[°C]

Tfinal = 100 [°C]

\(Q =0.25*4180*(100-25)\\Q = 78375 [J]\)

When Adolf swings, kinetic energy is converted to potential energy kg = 4,204.8m/s

The energy a thing has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it. We must make an effort in order to apply a force. After the work is finished, energy is transferred to the item, which then moves at a new, steady velocity.

Consider Adolf

KG= M

120kg

73kg

0.48m

kg=120 *73kg*0.48m/s

kg = 4,204.8m/s

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the tendency of an object to resist a change in motion is called inertia

Frequency is defined as the number of repetitions of waves occurring in 1 second. The frequency heard by the man as the ambulance move toward him will be greater than 450 Hz.

Frequency is defined as the number of cycles completed in 1 second. Frequency is given by the formula as,

\(\rm{Frequency =\frac{1}{time } }\)

As the formula shows frequency is inversely proportional to the time that shows if the time is decreasing frequency will increase and vice versa.

In the above case, the ambulance is moving toward the men. So that the time to meet up is decreased that's why the frequency will be greater than the initial frequency from the siren.

Hence the frequency heard by the man as the ambulance move toward him will be greater than 450 Hz.

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Answer: the answer is b more than 450 hz

Explanation: i took the test

Answer:

A. Gradulated Cylinder

A graduated cylinder is a tool that should be used to measure the mass of an object, first by measuring the volume of the substance and then calculating the mass by using the density, therefore the correct answer is option A.

A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.

Any additional quantity of that type can be stated as a multiple of the measurement unit.

stopwatch is used to measure the time period.

scale is used to measure the length.

A thermometer is a tool used to measure the temperature.

The correct response is option A because a graduated cylinder should be used to determine an object's mass by first determining the substance's volume and then calculating the mass using a density.

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For a twin-sized air mattress used for camping has dimensions of 100 cm by 200 cm by 15 cm when blown up, the weight is mathematically given as

M=2923.38N

Generally, the equation for the maximum mass   is mathematically given as

M=Vp-m

Therefore

M=100*200*15(1*10^3)-2kg

M=298kg

In conclusion,  the weight

W=298kg*9.81

W=2923.38N

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Well light waves are rays of energy and sound waves are vibrations that tun into sound from our ears.

Hope it helps!

The calculated instantaneous velocity is 65 m/s

Instantaneous velocity is a more concise term for an object's velocity at that precise moment in time. So, "The velocity of an object under motion at a specific point in time" is the definition provided. The instantaneous velocity of an object may be equal to its standard velocity if it possesses uniform velocity.

given- initial velocity=5 m/s

acceleration=6 m/s²

time taken=10 s

we can use the formula-

v = u + at

v = 5 + (6) (10)

v = 5 + 60

v = 65 m/s

Hence the velocity at instance is 65 m/s

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Answer:

It is not possible to change direction twice, given constant acceleration. To convince yourself, imagine any general v−t graph - it would be straight line in case of constant acceleration. Change in direction corresponds to v going from positive to negative or vice versa.Explanation:

Answer:It is not possible to change direction twice, given constant acceleration. 

Explanation:To convince yourself, imagine any general v−t graph - it would be straight line in case of constant acceleration. Change in direction corresponds to v going from positive to negative or vice versa.

The magnitude of the average voltage induced in the coil is 12.5 volt.

It is the creation of a potential difference in a coil as a result of variations in the magnetic flux flowing through it. To put it another way, it is said that electromotive force, or EMF, is created when the flux connecting with a conductor or coil changes.

Given that: a circular coil with an area of 0.0500 m^2 is wrapped with 500 turns of wire and the magnetic field changes in value from -0.100 T to 0.150 T in an interval of 0.500 s.

Hence, the magnitude of the average voltage induced in the coil is =

N ( B₂ - B₁) A/t

= 500(0.150 - (-0.100))0.0500/0.500 volt.

= 12.5 volt.

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Answer:

12125.42 Lbs.

Explanation:

The weight of the elephant is 53,900 N

The given parameters;

mass of the elephant = 5,500 kg

The weight of the elephant is calculated as;

Weight = mg

where;

m is the mass of the elephant

g is acceleration due to gravity = 9.8 m/s²

The weight of the elephant is calculated by substituting the given parameters;

Weight = 5,500 x 9.8 = 53,900 N

Thus, the weight of the elephant is 53,900 N

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The kangaroo's horizontal speed will be 9.7 m/s and its departure speed will indeed be 10.65 m/s.

By observing the pace at which this compressed region moves through the medium, we may determine the sound speed. The sound wave travels at a speed of around 343 meters per second in low humidity at 20 degrees Celsius.

The following equation relates the distance to the direction and initial velocity:

d = [v₀²sin2θ]/g, where θ – the angle of the jump.

Thus, v₀² = gd / (sin2θ) = (9.8×8)/0.69 = 113.62

v₀ = 10.65 m/s ( the take off speed).

The horizontal velocity equals:

vₓ = v₀cos 22° = 10.65 m/s × 0.92 = 9.7 m/s

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The given problem can be solved using the following free-body diagram:

The diagram is the free-body diagram for the pulley that is holding the weight. Where:

Now we add the forces in the vertical direction:

Adding like terms:

Now, since the velocity is constant this means that the acceleration is zero and therefore the sum of forces is zero:

Now we solve for "T" by adding "mg" from both sides:

Now we divide both sides by 2:

Now we substitute the values and we get:

Solving the operations:

Now we use the free body diagram for the second pulley:

Now we add the forces in the vertical direction:

The forces add up to zero because the velocity is constant and the acceleration is zero:

Solving for the force:

Therefore, the pulling force is equal to the tension we determined previously and therefore is:

The same thing could reasonably be said about multicollinearity. Specifically, the reason for this is due to the violation of the assumption of independent predictors.

Let us understand what these terms mean:

In statistical analysis, multicollinearity is the high correlation among predictors in a regression model. It is problematic because of its adverse effects on the model, including making it difficult to determine the effect of an independent variable, coefficients becoming insensitive to small changes in the model, and reducing the reliability of the model.

In regression analysis, independent predictors are those variables that contribute to the prediction of the dependent variable or outcome, and their inclusion in the model improves the accuracy of the prediction of the model.

In a regression model, it is an assumption that predictors are independent, which means that the predictors have little to no correlation with each other. If this assumption is violated, it is known as multicollinearity.

Therefore, the same thing could reasonably be said about multicollinearity. Specifically, the reason for this is due to the violation of the assumption of independent predictors.

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Answer:

Igneous

Explanation:

The moment of inertia of a wheel about its axle does not depend upon its diameter, mass, distribution of mass, shape, or speed of rotation. This is because the moment of inertia is a property of an object's mass distribution and how it is rotating, and is not affected by any of these factors individually.

The moment of inertia of the wheel is equal to the sum of moment of inertia of rim and spokes. which is the required answer to our question. Note: Moment of inertia plays a role only when the body is rotating about an axis. That is why, the axis is always related to the moment of inertia.

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The magnitude of the centripetal acceleration of the car is 0.0314 m/s².

centripetal acceleration

Centripetal acceleration is described because the assets of the motion of an item, traversing a circular path. Any object that is shifting in a circle and has an acceleration vector pointed in the direction of the center of that circle is referred to as Centripetal acceleration.

a = v²/ r

r = 3500 m (SI unit)

t = 200 s

circumference = C

C = 2 * π * r

C = 2 * 3.141 * (3500 m)

C = 21987 m

v = D / t

v = (21987 m) / (200 s)

v = 109.935 m/s

a = (109.935 m/s)² / (3500 m)

a = (109.935 m/s²) / (3500 m)

a = 0.0314 m/s²

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The Acceleration of the system is 6.41 m/s².

Given,

α= 15°, m₁ = 7kg

β= 65°, m₂ = 11 kg

Let, a be the acceleration and T is the tensions at the end it's the cord.

Let, the mass m₂ be coming down along the inclined plane along the inclined surface towards downward m₂g sin β and the tension in the upward direction,

Resultant force, m₂a=m₂g sin β -T

11a=((11) ×g sin 65°) -T  ...(i)

Now, considering the motion of m₁ which moves downwards, the forces are m₁g sinα, and T both are acting downwards.

Resultant force m₁a = m₁g sin α+T

7a =7g sin 15°+T  ...(ii)

Solving both the equations by adding them,

18a=11gsin 65°+7g sin 15°-T+T

18a=11gsin 65°+7g sin 15°=115.45

a=115.45/18=6.41 m/s²

Hence, the Acceleration of the system is 6.41 m/s².

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Answer:

It is (a) pull because when we are on earth we have gravity and it is pulling us down hope you have a great day!! :)

Explanation:

To calculate the voltage across the capacitor is (1.44)R.

What is speed?

The speed at which electrons move past a particular location in an electrical circuit is known as the "current." In the most basic terms, current = flow. The international unit for measuring current is the ampere, pronounced "amp" (AM-pir).

What is voltage?

Voltage is the "pressure" under which electricity is pushed. Higher voltages result in more electricity flowing to an electronic device. The amount of voltage is measured in units known as volts (V).

I=1.4A

V=?

V=(1.44)R

R⇒ resistance

Therefore, the voltage across the capacitor is (1.44)R.

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Answer:

5.6m

Explanation:

given

Applied force(F)=625N

workdone(w)=3500J

distance travelled by wheel barrow(s)=w/F

= 3500/625

= 5.6m

Einstein was the first to postulate that light is made up of photons, which are essentially energy bundles.

A photon is a microscopic particle made up of electromagnetic radiation waves. Maxwell demonstrated that photons are merely electric fields moving through space. Photons move at the speed of light and have no charge or rest mass. Charged particles produce photons, though they can also be produced by other processes, such as radioactive decay.

It's common to refer to photons as energy packets. This analogy is excellent because a photon has uncondensable energy. An alternating electric field is how this energy is kept in reserve. The universe's size, which is the longest theoretical wavelength of light, and the Planck length, which some theories claim to be the smallest, have never been measured. These energy packets may travel great distances without losing energy or speed. In vacuum, photons move at the speed of light, which is 2.997 x 108 m/s.

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Answer:

C.

Explanation:

Melting happens when the molecules of a solid gain enough momentum that the motion overcomes the attractions, allowing the molecules to move. Molecular motion does not decrease; this occurs when liquid freezes. Neither will it 'disappear'.

This motion comes from kinetic energy is being added to the molecules, not removed. This 'excites' the particles, which breaks the bonds that hold them together, which results in solid melting into water.

Therefore A, B, and D are incorrect, making C correct.

Answer:

C. Molecules vibrate quicker, and their motion overcomes the forces of attaraction.

Explanation:

Temperature remains constant as the ice gradually changes to liquid state; melting point. It remains constant as the increased kinetic energy it had acquired makes its molecules vibrate vigorously causing further weakening between the molecules. Therefore, the ice changes to water as energy is added at the melting point.

Answer:

B is the right answer

Explanation:

It is decreasing.

A car maintains a constant speed while driving straight ahead.

The acceleration of an object is the rate of change of velocity with time. It is measured in meter per second square.

The car undergoes velocity when there is change in direction of the speed.

Thus, the only option that does not describe acceleration is a car maintains a constant speed while driving straight ahead.

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Answer:

Real Image

Explanation:

Images which are formed on the screen by the actual intersection of light rays are called real images.

Answer:

Explanation:

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Answer:

Kinetic Energy

Explanation:

The given statement 'A positive magnification means the image is inverted compareed to the object' is false. Because when the image is virtual and erect then magnification is taken as positive.

The element is likely to be in the p-block of the periodic table, since elements in this block typically have a low first ionization energy and high subsequent ionization energies. The element with these ionization energies is Nitrogen (N), which has the electron configuration 1s2 2s2 2p3.

The ionization energy of an element is the energy required to remove an electron from a neutral atom of that element. The given ionization energies are:- ie1: 0.8, ie2: 2.43, ie3: 3.66.ie4: 25.02,ie5: 32.82.

To find the element with these ionization energies, we can use the periodic table and look for elements with similar ionization energy values.

In general, as we move across a period from left to right, the ionization energy of the elements increases due to the increasing nuclear charge.

Similarly, as we move down a group, the ionization energy of the elements decreases due to the increasing distance of the outermost electrons from the nucleus.

Based on the given ionization energies, we can identify the element as follows:

- The first ionization energy (ie1) is relatively low, suggesting that the outermost electron is not strongly bound to the nucleus.

- The second ionization energy (ie2) is significantly higher than the first, indicating that the removal of a second electron requires much more energy.

- The third ionization energy (ie3) is higher than the second, suggesting that the second electron was removed from a more stable configuration.

- The fourth ionization energy (ie4) is much higher than the third, indicating that the third electron was removed from a very stable configuration.

- The fifth ionization energy (ie5) is higher than the fourth, suggesting that the removal of a fifth electron requires even more energy.

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