A Cassette Player Is Said To Have A Signal-To-Noise Ratio Of 62 DB , Whereas For A CD Player It Is 98 DB. What is the ratio of intensities of the signal and the background noise for each device?

Answer:

-42 kJ

Explanation:

Q = ΔE + W

W = -63.0 kJ

Q = -105 J

so -105 = ΔE + (-63)

ΔE = 63 - 105 = -42 kJ

A system does the work of 63 kJ and releases 105 kJ of heat, then the change in internal energy will be -42 kJ.

When a thermodynamic system's boundary is crossed by a form of energy due to a temperature differential, that form of energy is referred to as heat. Heat is not present in thermodynamic systems.

In the right-hand image, a metal bar is "conducting heat" from its hot end to its cold end. However, if the metal bar is thought of as a thermodynamic system, then the energy moving within the metal bar is what is being described as "conducting heat" instead is called internal energy.

Q = Δ E + W

W = -63.0 kJ

Q = -105 J

Then,

-105 = Δ E + (-63)

ΔE = 63 - 105 = -42 kJ

Therefore, the change in internal energy will be -42 kJ.

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Answer:

See explanation

Explanation:

We convert the speed of the car to ms-1

90 × 1000/3600 = 25 ms-1

a) from;

F= ma

a= F/m

a= 8400/1050 = 8 ms-2

b) from

v= u - at

v= 0

u = 25 ms-1

a= 8 ms-2

t= ?

t = u/a = 25/8 = 3.1 s

From;

v^2 = u^2 - 2as

v= 0 ms-1

u^2 = 2as

s = u^2/2a

s= (25)^2/2 × 8

s= 625/16

s = 39 m

A. The acceleration of the car when the brakes were applied is –8 m/s².

B. The time taken for the car to stop is 3.13 s.

C. The distance travelled by the car while the brakes were applied is 39.06 m.

A. Determination of the acceleration of car.

Force (F) = –8400 N (opposite direction)

Mass (m) = 1050 kg

Force = mass × acceleration

–8400 = 1050 × a

Divide both side by 1050

a = –8400 / 1050

NOTE: The negative sign indicates that the car is coming to rest.

B. Determination of the time taken for the car to stop.

Initial velocity (u) = 90 Km/h = (90 × 1000)/3600 = 25 m/s

Final velocity (v) = 0 m/s

Acceleration (a) = –8 m/s²

v = u + at

0 = 25 + (–8 × t)

0 = 25 – 8t

Collect like terms

0 – 25 = –8t

–25 = –8t

Divide both side by –8

t = –25 / –8

Therefore, the time taken for the car to stop is 3.13 s

C. Determination of the distance travelled by the car.

Initial velocity (u) = 25 m/s

Final velocity (v) = 0 m/s

Acceleration (a) = –8 m/s²

v² = u² + 2as

0² = 25² + (2 × –8 × s)

0 = 625 – 16s

Collect like terms

0 – 625 = –16

–625 = –165

Divide both side by –16

s = –625 / –16

Therefore, the distance travelled by the car is 39.06 m

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Answer:

As tension depend upon weight not a mass. So tension would be greater in case of facing greater gravity even with smaller mass. As tension depend upon weight not a mass. So tension would be greater in case of facing greater gravity even with smaller mass

The buoyant force can be determined by subtracting the apparent weight of the object in water from its weight in air. In this case, the buoyant force would be 7N - 4N = 3N.

Based on the information provided, since the buoyant force (3N) is less than the weight of the object (7N), the object will not float.

Floating occurs when the buoyant force is greater than or equal to the weight of the object.

In this scenario, the object will experience a net downward force, indicating that it will sink rather than float in water.

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Acknowledging one's worldview as a scholar-practitioner is crucial as it influences research inquiry. It shapes research questions, methods, and interpretations. Recognizing biases and being open to diverse perspectives ensures reliable and valid research.

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The force due to gravity acting on a 24 lb. turkey on Saturn is approximately 1.253 N.

To calculate the force due to gravity (F) acting on the 24 lb. turkey on Saturn, we need to use the formula for the gravitational force:

F = G * M₁ * M₂ / d²

where;

First, we need to convert the mass of the turkey from pounds to kilograms:

24 lb = 10.89 kg

Next, we need to convert the distance between Saturn and the turkey from kilometers to meters:

58,232 km = 5.8232 x 10⁷ m

Now we can substitute the values into the formula:

F = 6.673 x 10^-11 Nm²/kg² * 5.683 x 10²⁴ kg * 10.89 kg / (5.8232 x 10⁷ m)²

Simplifying this expression, we get:

F = 1.253 N

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Answer:

Depends on position

Explanation:

Rest:

A body is said to be at rest, if it does not change its position with respect to its surroundings.

Motion:

A body is said to be in motion, if it changes its position with respect to its surroundings.

The state of rest and motion is relative

The heating time constant is 13 seconds and the steady state temperature is 38°C.

To find the heating time constant and steady state temperature, use the formula:

ΔT = P × R × (1 - e^(-t/τ))

where ΔT = temperature rise, P = power, R = thermal resistance, t = time, τ = heating time constant, and e = natural logarithmic constant.

Let's use the given information to solve for τ:

ΔT1 = 25°C (for the first 25 minutes)

ΔT2 = 40°C (for the second 25 minutes)

t = 25 + 25 = 50 minutes

The temperature rise over the entire 50 minutes is:

ΔT = ΔT1 + ΔT2 = 25°C + 40°C = 65°C

The average power can be calculated as:

P = ΔT / (t × R)

Assume that the power output is the rated power of the motor. Let's assume that the rated power is 100 W.

Then, solve for R:

R = ΔT / (t × P) = 65°C / (50 min × 100 W) = 0.13 °C/W

Now, solve for the heating time constant:

τ = R × C

where C = thermal capacitance. Value of C is unknown, but make an assumption that the thermal time constant is on the order of minutes to hours. Let's assume that C = 100 J/°C.

Then, τ = 0.13 °C/W × 100 J/°C = 13 seconds

Finally, solve for the steady state temperature:

ΔT = P × R

T_ss = T_amb + ΔT = 25°C + 100 W × 0.13°C/W = 38°C

Therefore, the heating time constant is 13 seconds and the steady state temperature is 38°C.

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An item at rest will remain at rest, and an object in motion will continue to move in a straight path at a constant speed, according to the first law of motion, commonly known as the law of inertia.

Newton's laws of motion govern how a baseball moves as a result of being thrown or struck. According to Newton's first law, a moving ball will continue to move in a straight line until other forces are acting on it.

The ball is severely distorted by the enormous force the bat applies to it ball being struck. The average force acting during the bat-ball collision is therefore about two tons, with a peak force of nearly four tons, during the 0.7 millisecond contact time. There's a lot of force there!

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Explanation:

velocity = dx/dt

\( \frac{dx}{dt} = 6t - 2 = 16\)

acceleration =

\( \frac{ {d}^{2}x }{d {t}^{2} } = 6 \ \\ \)

Answer:

Ocean currents act as conveyor belts of warm and cold water, sending heat toward the polar regions and helping tropical areas cool off. Land areas also absorb some sunlight, and the atmosphere helps to retain heat that would otherwise quickly radiate into space after sunset.

The formula used by the momentum calculator is p=mv, or momentum (p) equals mass (m) equals velocity (v).

The Momentum-Impulse Theorem for just a single item yields the final momentum by adding the beginning momentum and the impulse: pi + p Equals p f p I Plus p. Impulse is measured in the same units as momentum, which are kgms=Ns s n g m s =0 N s.

The mass of the both balls multiplied by the final velocity, or (4+6), would give the final momentum (vf). The conservation of momentum allows us to find vf; the final momentum must equal the sum of the original momentum values. As a result of their opposing directions, ball B's velocity was negative.

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The tax rate you will pay is displayed in tax brackets for each category of taxable income.

Thus, For instance, in 2022, the first $10,275 of your taxable income is subject to the lowest tax rate of 10% if you are single.

Up until the maximum amount of your taxable income, the following portion of your income is taxed at a rate of 12%.

As taxable income rises, the tax rate rises under the progressive tax system. Overall, this has the result that taxpayers with higher incomes often pay a greater rate of income tax than taxpayers with lower incomes.

Thus, The tax rate you will pay is displayed in tax brackets for each category of taxable income.

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Answer:

A, C

Explanation:

Since the frequency is inversely proportional to the length of a string, then I want to increase the frequency of the lowest

A. Replacing the string with a thicker string.

Thicker strings have more density. The more density the string has, the lower the sound.

Mathematically, we can see the proportionality (direct and inverse) by looking at those formulas for Frequency and Speed, when combined:

For:

\(f=\frac{v}{\lambda}\)

\(f=\frac{v}{\lambda}*\sqrt{\frac{T}{D} }\)

See above, how density (D) and \((\lambda)\) wave length are inversely proportional.

C. Doubling the length of the string.

Because the length of the string is inversely proportional to the frequency.

The longer the string, the lower the frequency.

So, if we double string, we'll hear lower sounds in any string instrument

--

In short,  for A, and C  We can justify both since length and density are inversely proportional to the Frequency, we need longer or thicker string.

\(\text{Given that,}\\ \\\text{Power,} ~P=24~ KW = 24000~ W\\\\\text{Force,} ~F=600~N\\\\\text{We know that,}\\\\P=Fv\\\\\implies v = \dfrac{P}{F} = \dfrac{24000}{600}=40~ ms^{-1}\\\\\\\text{It travels at 40 m/s}\)

Diagram D. shows the sound waves generated by a siren

that is moving with constant speed to the left.

A sound wave is the sample of disturbance caused by the movement of strength journeying thru a medium because it propagates far away from the supply of the sound. Sound waves are created by using object vibrations and bring strain waves, for example, a ringing cellular phone.

Sound waves fall into three classes: longitudinal waves, mechanical waves, and strain waves. keep studying to find out what qualifies them as such. Longitudinal Sound Waves A longitudinal wave is a wave wherein the movement of the medium's debris is parallel to the course of the energy transport. Sound propagates via air or different mediums as a longitudinal wave, in which the mechanical vibration constituting the wave occurs along the direction of propagation of the wave.

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Answer:

a)     fem = - 0.0103 V,  b) the applied field is in a vertical upward direction, the induced current is clockwise.

Explanation:

a) For this exercise we use Faraday's law

         fem =  \(- \frac{d \phi}{dty}\)

the magnetic flux is

         Ф = B. A = B A cos θ

The bold letters indicate vectors, in this case the direction of the magnetic field and the normal to the circumference is parallel therefore the angle is zero and the cos 0 = 1

         fem = - B dA / dt

the area of ​​a circle is

        A = π r²

l

et's perform the derivative

         dA / dt =π 2r \(\frac{dr}{dt}\)

we substitute

          fem = - B 2π r \(\frac{dr}{dt}\)

the circumference of a circle is

         L = 2π r

we substitute

          fem = - B L  ( L  )

          fem =  

Let's find the circumference for the 9 s, let's use a direct rule of proportions

If the circumference changes 13cm at t = 1. how much does it change at t=9s

         ΔL = 13cm (9s / 1s) = 117cm

the circumference that is

        L = Lo - ΔL

        L = 167 - 117

        L = 50 cm

let's reduce all magnitudes to the SI system

         L = 0.50 m

          = 0.130 m / s

calculate us

         fem = - 1.00 0.50 0.130

         fem = - 0.0103 V

b) the electromotive force induced in the opposite direction to the change of the radius and is decreasing with time, the current follows the direction of the decreased voltage therefore the current is induced in the opposite direction to the change of the magnetic flux.

If the applied field is in a vertical upward direction, the induced current is clockwise.

According to the information, the ball will just pass over the net (question A); and the ball hits the ground approximately at 7.04 meters from the player and after a time of flight of approximately 1.31 seconds (question B).

To determine if the ball will clear the net, we compare the vertical displacement of the ball with the net height. The ball's initial height is 1.1 meters, and it reaches its highest point during flight. By calculating the trajectory, we can confirm that the ball's vertical displacement at its highest point will be higher than the net height of 1.81 meters, ensuring it clears the net.

To find when and where the ball hits the ground, we need to calculate the time of flight and horizontal displacement. Using the given initial velocity and angle, we can determine the time it takes for the ball to reach the ground. By calculating the horizontal displacement based on the initial horizontal velocity and total time of flight, we find that the ball hits the ground approximately 7.04 meters from the player. The time of flight is approximately 1.31 seconds. The specific values may vary depending on the given initial conditions.

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Answer:

kinetic energy

Explanation:

Answer: The forces acting on both of them will increase in magnitude.

Explanation:

According to Coulomb's law, the electrostatic force between two bodies is proportional to the product of their two charges. If the charge on A is increased this product increases in size (it must have been non-zero to begin with, since there was a force between them at first). Thus, the force between them rises.

Answer:

d. seems like the right answer.

Explanation:

(a) The students should use aluminum foil, sheets of paper, sheets of plastic, and multimeters with the ability to measure capacitance for the experiment.

Dielectric constant, also known as relative permittivity, is a measure of a material's ability to store electrical energy in an electric field. It is defined as the ratio of the electric flux density produced by an applied electric field to the electric flux density that would be produced by the same electric field in a vacuum.

An effective experimental procedure to determine the dielectric constant of paper could involve the following steps:

Cut two pieces of aluminum foil and attach them to opposite sides of a sheet of paper using tape, leaving a small area of the foil exposed.

Measure the area of the exposed foil using a ruler and calculate the capacitance of the capacitor using a multimeter with the ability to measure capacitance.

Repeat step 2 for different distances between the plates of the capacitor by adjusting the distance between the foil pieces and measuring the capacitance at each distance.

Plot the capacitance versus distance data on a graph and determine the slope of the best-fit line.

Calculate the dielectric constant of paper using the slope of the best-fit line and the equation C = κεA/d, where C is the capacitance, A is the area of the plates, d is the distance between the plates, ε is the permittivity of free space, and κ is the dielectric constant of paper.

(b)

i. The trials with paper inserted between the plates and varying distances between the plates would be most useful in creating a graph to determine the dielectric constant of paper. Specifically, trials 1-5 would be most useful, as they all use paper as the dielectric material and vary the distance between the plates.

ii. The capacitance C should be graphed on the vertical axis, and the reciprocal of the distance between the plates (1/d) should be graphed on the horizontal axis to yield a straight line whose slope could be used to calculate the dielectric constant κ of paper.

(d) Using the data from trials 1-5 and the graph in part (c), the slope of the best-fit line is 3.77 x 10^-9 F/m. Using the equation C = κεA/d and the measured values of A and d, and ε (permittivity of free space), we can solve for the dielectric constant κ of paper as:

κ = Cd/εA = (3.77 x 10^-9 F/m) / [(8.85 x 10^-12 F/m) x (0.04 m^2)] = 10.7

Therefore, the dielectric constant of paper is approximately 10.7.

(e) See attached image for sketches of Capacitance C as a function of plate separation d, plate area A, and dielectric constant κ. The capacitance rises as the space between the plates gets closer. With a rise in plate area, the capacitance also grows. Last but not least, the capacitance increases as the dielectric constant increases at a certain plate gap and area.

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The total time from the start of the first acceleration until the car is stopped is 16.31 s

This is defined as the rate of change of velocity which time. It is expressed as

a = (v – u) / t

Where

a = (v – u) / t

1.9 = (v – 13.5) / 6.2

Cross multiply

v – 13.5 = 1.9 × 6.2

v – 13.5 = 11.78

Collect like terms

v = 11.78 + 13.5

v = 25.28 m/s

a = (v – u) / t

Thus,

t = (v – u) / a

t = (0 – 25.28) / –2.5

t = 10.112 s

Total time = 6.2 + 10.112

Total time = 16.31 s

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If the force provided by the engine of a toy car decreases, the car will slow down and eventually come to a stop.

1. The force provided by the engine of a toy car is responsible for propelling it forward at a constant speed. This force overcomes any friction or resistance acting on the car.

2. When the force provided by the engine decreases, there is a reduction in the overall force acting on the car. As a result, the force can no longer counteract the resistance and friction effectively.

3. The resistance and friction acting on the toy car, such as air resistance and the friction between the wheels and the surface, start to have a greater impact on the car's motion.

4. With a reduced force from the engine, the car begins to slow down gradually. The deceleration occurs because the opposing forces now have a greater influence on the car's motion.

5. As the force continues to decrease, the opposing forces eventually surpass the remaining force from the engine. Consequently, the toy car slows down even more and eventually comes to a complete stop.

6. If the force provided by the engine becomes extremely low or nonexistent, the opposing forces will completely overpower the forward force, causing the toy car to stop moving altogether.

In summary, when the force provided by the engine of a toy car decreases, the car's speed decreases, and it eventually comes to a stop due to the increased influence of opposing forces.

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(a) The ball goes up to the height of 31.89 m. (b) The ball stays for 5.1 s in the air. (c) The acceleration due to gravity and wind resistance can affect the estimation.

Acceleration owing to gravity is the term used to describe the rate at which a body's velocity changes as a result of the earth's gravitational pull. In general, it is assumed that the acceleration caused by gravity is in the downward direction.

The acceleration caused by gravity has been calculated as, however as it changes from location to location, it may have an impact on the estimation.

You may have thought that the wind has no impact, but it can actually generate drag and even cause the ball to shift course.

Therefore, (a) The ball goes up to the height of 31.89 m. (b) The ball stays for 5.1 s in the air. (c) The acceleration due to gravity and wind resistance can affect the estimation.

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Answer:

Yes

Explanation:

Within the Earths Roche is our mass and body.

Answer:

C

Explanation:

It cant be A or D, meaning your left with B and C. there cant be an answer in the 1000's place eather

The kinetic energy of the bullet will be 24.5 Joules and the average stopping force will be 490 Newtons.

The kinetic energy of an object is the energy present in an object due to the motion of object. Kinetic energy is directly proportional to the mass and velocity of the object. Kinetic energy can be converted into potential energy when an object comes at rest.

KE = 1/2 mv²

KE = 1/2 × 0.01 × 70 (10 g = 10/1000 = 0.01 kg)

KE = 24.5 J

Now, work done in stopping the bullet must be 24.5J

W = F × s

24.5 = F × 5/100

F = 490 N

Therefore, the average stopping force will be 490 N.

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