In parallel-flow heat exchangers, the outlet temperature of the cold fluid may exceed the outlet temperature of the hot fluid. Group of answer choices True False

Answer:

i. + 22.5 m ii. 4.0 m

Explanation:

i. Image distance

Using the lens formula

1/u + 1/v = 1/f where f = focal length = + 18.0 m, u = object distance = distance of shark away from lens = + 90.0 m and v = image distance from lens = unknown

So, we find v

1/v = 1/f - 1/u

= 1/+18 - 1/+90

= (5 - 1)/90

= 4/90

v = 90/4

= + 22.5 m

So the image is real and formed 22.5 m away on the other side of the lens.

ii Length of Shark

Using the magnification formula, m = image height/object height = image distance/object distance. image height = 1.0 m where object height = length of shark.

m = image distance/object distance

= v/u

= +22.5/+90

= 0.25

0.25 = image height/object height

So,

object height = image height/0.25

= 1.0 m/0.25

= 4.0 m

So, the length of the shark is 4.0 m

The maximum current delivered by the AC source connected across the 3.70 µF capacitor is approximately 0.0369 amperes.

To calculate the maximum current delivered by an AC source connected across a capacitor, you need to use the below formula.

I = C × δVmax × 2πf.

Where:

I = Maximum current (in amperes)

C = Capacitance (in farads)

δVmax = Maximum voltage (in volts)

f = Frequency (in hertz)

Given:

δVmax = 46.0 V

f = 80.0 Hz

C = 3.70 µF = 3.70 × 10⁻⁶ F

Plugging in the values into the formula:

I = (3.70 × 10⁻⁶ F) × (46.0 V) × (2π × 80.0 Hz)

Calculating:

I = (3.70 × 10⁻⁶ F) × (46.0 V) × (502.65)

I = 0.0369 A

Therefore, the maximum current delivered by the AC source connected across the 3.70 µF capacitor is approximately 0.0369 amperes.

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Transcranial magnetic stimulation has been promoted as an important treatment for treatment-resistant depression.

Transcranial magnetic stimulation (TMS) has considered as one of the best treatment option for treatment-resistant depression. While current methods of data largely support efficacy of TMS for big depressive disorder, current research basically aims to enhance and amplify treatment parameters and methods and identify markers of treatment process response against the external given stimuli. Clomipramine is FDA approved to treat obsessions and compulsions in OCD. The current method for the treatment of the depression is far better than the old and traditional method of curing of depression. The new method cures the problem in a more fast and efficient way. It stops the membrane pump mechanism responsible for uptake against the downward of the chemical against the depression. Hence, we can consider that the Transcranial magnetic stimulation has been promoted as an important treatment for treatment-resistant depression.

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The average speed of the dragon fly for the interval from t = 0 to t = 8 s is 1 m / s

v = d / t

v = Average velocity

d = Total distance flown

t = Total time taken

d = 2 m ( Positive x-direction ) + 4 m ( negative x-direction ) + 2 m ( Positive x-direction )

d = 8 m

t = 8 s

v = 8 / 8

v = 1 m / s

Average speed is the average value of speed for a given distance at a given time. It can also be found using the initial and final velocities if the acceleration is constant.

The given question is incomplete. The complete question is:

A confused dragonfly flies forward and backward in a straight line. Its motion is shown on the following graph of horizontal position xx vs. time tt. What is the average speed of the dragon fly for the interval from t = 0 to t = 8 s? The graph is attached as image.

Therefore, the average speed of the dragon fly is 1 m / s

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Answer:Ionic compounds are (usually) formed when a metal reacts with a nonmetal (or a polyatomic ion). Covalent compounds are formed when two nonmetals react with each other.

Explanation:

hope it helped

Answer:

it ccl4

Explanation:

it a covalent because it is also recognize as IUPAC

Answer:

Because it has more texture and is solid. Its like glass

Explanation:

Answer:

Why is ice more reflective (has higher albedo) than liquid water? They're both the same substance (water). Is something quantum mechanical involved?

Explanation:

In fact ice is slightly less reflective than water. The reflectivity is related to the refractive index (in a rather complicated way) and the refractive index of ice is 1.31 while the refractive index of water is 1.33. The slightly lower refractive index of ice will cause a slightly lower reflectivity. In both cases the reflectivity is about 0.05 i.e. at an air/water or air/ice surface about 5% of the light is reflected.

Due to atmospheric solar radiation absorption and scattering, the amount of radiation reaching the surface in a 1-layer atmosphere is enhanced by a factor of two.

Without an atmosphere, the amount of radiation reaching the surface is equal to the amount that the Sun emits. The single-layer atmosphere model accurately depicts the fundamental physical mechanisms causing atmospheric warming, however model-related numerical figures should be treated with caution. Note that there are two sources of the energy that is released into space. Energy balance models (EBMs) are remarkably simplified representations of the climate system that offer valid conceptual aids in comprehending climatic changes. The radiation budget, which accounts for both the Sun's incoming energy and its outgoing energy, determines the global temperature.

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Answer:

(5g/cm³)*(10cm³) = 50g

Explanation:

This is just a conversion formula. Easy to find using dimensional analysis.

(5g/cm³)*(10cm³) = 50g

Answer:

\(\boxed {\boxed {\sf 50 \ grams}}\)

Explanation:

Density is the amount of mass per unit volume, so the formula is:

\(d = \frac{m}{v}\)

The density of the substance is 5 grams per cubic centimeter and the volume is 10 cubic centimeters.

Substitute the values into the formula.

\(5 g/cm^3 = \frac{m}{10 \ cm^3}\)

We are solving for the mass, so we have to isolate the variable m. It is being divided by 10 cubic centimeters. The inverse of division is multiplication, so we multiply both sides of the equation by 10 cm³.

\(10 \ cm^3 *5 g/cm^3 = \frac{m}{10 \ cm^3} * 10 \ cm^3\)

\(10 \ cm^3 *5 g/cm^3 = m\)

The units of cubic centimeters (cm³) cancel.

\(10 *5 g = m\)

\(50 \ g=m\)

The mass of the substance is 50 grams.

Katherine Johnson accepted that the meetings were only for men and didn't ask to attend.

Meetings are when two or more people get together to talk about one or more topics, frequently in a formal or business setting, though they can also happen in a variety of other settings. Group decision-making can be done during meetings.

A meeting is a gathering of two or more individuals called for the express purpose of engaging in verbal interaction in order to accomplish a common objective, such as exchanging information or coming to a consensus. Face-to-face meetings can take place virtually through the use of communications technology, such as a telephone conference call, a skped conference call, or a videoconference.

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The material used before doubling will produce light at a frequency of 0.056 Hz.

The number of times a wave occurs repeatedly in a second is known as frequency.

The formula provides the frequency as,

\(\rm v = \lambda \times f \\\\\ \rm f = \frac{v}{\lambda} \\\\ \rm f = \frac{3 \times 10^8}{532 \times 10^-9} \\\\ \rm f = 3 \times 10^{12} \\\\ f= 0.056 \ Hz\)

Therefore, the material used before doubling will have an output light frequency of 0.056 Hz.

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Answer:

400m

Explanation:

From Newton's law of motion;

S = ut + 1/2 at2

Where U is initial velocity

a is acceleration

t is velocity hence;

S is distance covered

S = 20×10 + 1/2 × 4×(10)^2

= 200 + 200 = 400m

Answer:

v = 3.24 m/s

Explanation:

Since we don't have time, we can use the formula;

(Final distance - initial distance)/time = (initial velocity + final velocity)/2

Thus;

(x_f - x_i)/t = ½(v_xi + v_xf)

We are given;

x_i = 0 m

x_f = 5 m

v_xi = 0 m/s

v_xf = 5 m/s

Thus, plugging in the relevant values;

(5 - 0)/t = (0 + 5)/2

5/t = 5/2

t = 2 s

Using Newton's first law of motion, we can find the acceleration.

v = u + at

Applying to this question;

5 = 0 + a(2)

5 = 2a

a = 5/2

a = 2.5 m/s²

To get the speed, in m/s, of the block when it had traveled only 2.1 m from the top, we will use the formula;

v² = u² + 2as

v² = 0² + 2(2.5 × 2.1)

v² = 10.5

v = √10.5

v = 3.24 m/s

The consequences of an equation involving the rest mass (m0) of a particle and the speed of light (c). It asks about the outcome when a specific condition, denoted by "? 55," is met.

Einstein's mass-energy equivalence equation (E = m0c^2), the rest mass (m0) of a particle and the speed of light (c) are involved. When the condition "? 55" is mentioned, it is unclear what specific comparison or action is being referred to. Without further information, it is challenging to determine the consequences or outcome implied by this condition in relation to the given equation. Additional context or clarification would be required to provide a more specific explanation.

It is important to note that Einstein's mass-energy equivalence equation is a fundamental equation in physics, stating that energy (E) is equal to the product of the rest mass (m0) of a particle and the square of the speed of light (c^2). This equation highlights the profound connection between mass and energy, implying that mass can be converted into energy and vice versa. It forms the basis of concepts such as nuclear reactions, particle accelerators, and the understanding of the immense energy released in processes like nuclear fission and fusion. However, without a clear interpretation of the condition "? 55" in relation to the equation, it is not possible to provide a specific explanation of its consequences.

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The investment adviser to a hedge fund who has allocated 50% of the fund's assets to stocks and the other 50% to gold can be described as a "balanced" or "diversified" investment adviser.

This approach aims to create a balanced portfolio by allocating investments across different asset classes to reduce risk and potentially achieve a more stable return.

By investing in both stocks and gold, the investment adviser seeks to diversify the fund's holdings and potentially benefit from the performance of both asset classes.

Hence, The investment adviser to a hedge fund who has allocated 50% of the fund's assets to stocks and the other 50% to gold can be described as a "balanced" or "diversified" investment adviser.

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The radius of the sphere in centimeters​ is  50 cm

The wire has a certain volume that can be calculated as follows:

V_wire = πr²l

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

If the wire is melted and formed into a sphere, it will still have the same volume as before, which can now be expressed as:

V_sphere = (4/3)πr³

where r is the radius of the sphere.

Since the wire and the sphere have the same volume, we can equate the two expressions for volume:

πr²l = (4/3)πr³

Simplifying this equation by dividing both sides by πr² and then multiplying both sides by 3/4, we get:

r = (3/4)l/r

Substituting the given values, we get:

r = (3/4)(0.4 m)/(0.006 m) ≈ 50 cm

Therefore, the radius of the sphere is approximately 50 centimeters.

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Copper plating is the process of plating a layer of copper electrolytically on the surface of an item.

Copper plating is the process of depositing a copper layer onto various metals for functional and decorative purposes.

Copper plating is the process of plating a layer of copper electrolytically on the surface of an item.

It takes place in an electrolytic cell where electrolysis which uses direct electric current to dissolve a copper rod and transport the copper ions to the item.

The process of cooper plating is:

This forms a thin, solid, metallic copper film on the surface of the item.

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One of the Milankovitch cycles is the changes in the Earth's tilt.

Option C.

The Milankovitch cycles are cycles that relates the Earth motions and long-term climate change  and they include the following:

Thus, we can conclude that one of the Milankovitch cycles must relate to the changes in the Earth's tilt or  the angle Earth's axis is tilted with respect to Earth's orbital plane, known as obliquity.

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To answer this question, you need to understand the law of conservation of energy. Essentially, the law states that energy cannot be created or destroyed; it is always conserved.

Knowing this law, how can we answer this question? Well, let's look at what the question tells us. We know that Blackie was initially at the top of a refrigerator before rolling over and falling to the ground. At ground level, he only has Kinetic energy when he lands. Since we know that he started at the top of the fridge, we know that Blackie started off with potential gravitational energy.

That would make sense, right? Written out as an equation, it'd be:

\(U_{g}\) = \(K_{E}\)

This follows the law of conservation of energy, as all the potential gravitational energy is converted into Kinetic energy.

Now, we know what energies are converted. What can we do with it? Recall the equation of potential gravitational energy:

\(U_{g}\) = \(F_{g}\)∆H

\(U_{g}\) = mg∆H

Do you see it now? ∆H is the distance that Blackie falls, and since Blackie jumps from the fridge to the ground, ∆H must be the height of the fridge!

Let's start solving for ∆H:

\(U_{g}\) = \(K_{E}\)

Substitute potential gravitational energy with our equation:

mg∆H = \(K_{E}\)

We were given the value of Kinetic Energy:

mg∆H = 90

Isolate ∆H by dividing both sides by mg:

∆H = \(\frac{90}{mg}\)

Input values for 'm' and 'g' (m is the mass of Blackie and g is Earth's acceleration)

∆H = \(\frac{90}{6*9.80}\)

∆H = \(\frac{90}{58.8}\)

∆H = 1.53

The refrigerator is 1.53 meters tall.

And that's it! Let me know if you need me to explain anything I did here.

- breezyツ

The quantities of excess electric charge that could be found on an object are option a: 6.25 x 10^-19 C and option b: 4.80 x 10^-19 C. These values represent charges in coulombs (C), which is the standard unit of electric charge.

Electric charge is a fundamental property of matter and is quantized, meaning it exists in discrete units. The elementary charge, denoted as e, is the fundamental unit of electric charge. The value of the elementary charge is approximately 1.60 x 10^-19 C.

Option a: 6.25 x 10^-19 C is a valid quantity of excess electric charge that could be found on an object. It represents a charge of 6.25 times the elementary charge. This means that the object has accumulated 6.25 times the charge carried by a single elementary charge.

Option b: 4.80 x 10^-19 C is also a valid quantity of excess electric charge that could be found on an object. It represents a charge of 4.80 times the elementary charge. Similarly to option a this means that the object has accumulated 4.80 times the charge carried by a single elementary charge.

Options c and d are not valid quantities of excess electric charge. Option c, 6.25 elementary charges, does not provide a numerical value in a standard unit of electric charge like coulombs. Option d, 1.60 elementary charges, represents the charge equivalent to a single elementary charge, which is not considered an excess charge.

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When the circuit gets hotter, it can cause the electrical resistance  of current to increase.

The Joule's law of heating says that the heat energy produced in the conductor is directly proportional to the square of electric current, resistance and the time till which the current is supplied.

                                  H=I2RT

This increase in resistance can lead to a decrease in the current flowing through the circuit. In summary, when the circuit gets hotter, the current tends to decrease due to the increase in electrical resistance.

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A transverse wave is a wave in which particles of the medium move in a direction perpendicular to the direction that the wave moves. Suppose that a slinky is stretched out in a horizontal direction across the classroom and that a pulse is introduced into the slinky on the left end by vibrating the first coil up and down. Energy will begin to be transported through the slinky from left to right. As the energy is transported from left to right, the individual coils of the medium will be displaced upwards and downwards. In this case, the particles of the medium move perpendicular to the direction that the pulse moves. This type of wave is a transverse wave. Transverse waves are always characterized by particle motion being perpendicular to wave motion.

A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction that the wave moves. Suppose that a slinky is stretched out in a horizontal direction across the classroom and that a pulse is introduced into the slinky on the left end by vibrating the first coil left and right. Energy will begin to be transported through the slinky from left to right. As the energy is transported from left to right, the individual coils of the medium will be displaced leftwards and rightwards. In this case, the particles of the medium move parallel to the direction that the pulse moves. This type of wave is a longitudinal wave. Longitudinal waves are always characterized by particle motion being parallel to wave motion.

The new time period of the pendulum will be 2 times the original period.

The period of a simple pendulum is given by the equation:

T = 2π√(l/g)

where T is the period, l is the length of the pendulum, and g is the acceleration due to gravity.

If the length of the pendulum is increased by a factor of 4, the new period can be calculated as follows:

T' = 2π√(4l/g) = 2π√(4 × (l/g)) = 2π√4 × √(l/g) = 2 × 2π√(l/g) = 2T

Therefore, the new period of the pendulum will be 2 times the original period.

The period of oscillation of a pendulum is proportional to the square root of the length of the pendulum, so increasing the length of the pendulum by a factor of 4 will increase the period of oscillation by a factor of 2. This relationship can be shown mathematically by substituting the new length into the equation for the period of a pendulum.

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The oscillation period of a simple pendulum (as described in section 13.5) is measured to be t, and then the length of the pendulum is increased by a factor of 4. (for example, increased from 10 cm to 40 cm or 1 m to 4 m.) which option best describes the new period of the pendulum? group of answer choices

A. 2T

B. 4T

C. 8T

D. None of the above

The average friction force exerted on the toboggan is 191.6 N and percent reduction in speed is 35.7%.

Acceleration is the amount at which the velocity of an object changes over time. An object can accelerate by changing its speed, direction of motion, or both.

Equation:

mass of toboggan (m) = 365 kg

initial speed of toboggan (v1) = 4.20 m/s

final speed of toboggan (v2) = 2.70 m/s

distance over which toboggan slows down (d) = 6.00 m

acceleration of toboggan (a) = (v2² - v1²)/(2dd)

a = (v2² - v1²)/(2d) = (2.7² - 4.2²)/(26) = -0.525 m/s² (negative because acceleration is in opposite direction to motion)

friction force (F) = m*a = 365 kg * (-0.525 m/s²) = -191.6 N (negative because friction is in opposite direction to motion)

The average friction force exerted on the toboggan is 191.6 N.

Initial kinetic energy of toboggan (KE1) = 0.5 * m * v1² = 3663.3 J

Final kinetic energy of toboggan (KE2) = 0.5 * m * v2² = 2238.5 J

Percent reduction in kinetic energy = [(KE1 - KE2) / KE1] * 100% = [(3663.3 - 2238.5) / 3663.3] * 100% = 38.9%

Percent reduction in speed = [(v1 - v2) / v1] * 100% = [(4.2 - 2.7) / 4.2] * 100% = 35.7%

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Explanation:

Position-time graphs measure/express the position of a skater over time relative to the start or finish of the race (depends on how it is used). Note: are the skaters in line vertically or horizontally? Like is one directly behind the other or are they next to each other?

If the two skaters are in line horizontally with each other, then their position will be the same relative to the start or finish of the race. This means if one passes the other one, the position would be different for all times after they pass. On the graph, it would look like one single line at the start (as position is same) which splits into 2 (representing the new difference in position due to 1 passing the other.

If the two skaters are in line vertically, their lines on the graph will appear parallel to each other (assuming they are going same speed) because the position is changing at the same rate, one is just reaching the same point after the other. If the skater behind overtakes the one in front. The lines on the graph will cross and continue either in parallel but with the other line on top to represent the moment where their position is the same right before they pass and after, where the second skater is now in front.

Hope this helped!

Answer:

2 meters a second or 2 m/s

Answer:

Good one

Explanation:

Hydrogen has the highest thermal conductivity of any gas.

The time taken for the spider crawling at 630 ft/hr to travel through the 15 ft wide room is 42 hours

From the formula of speed, we can obtain a formula for calculating time as illustrated below:

Speed = Distance / time

Cross multiply

Speed × time = Distance

Divide both sides by speed

Time = Distance / speed

Using the above formula, we can obtain the time taken from the spider to travel through the room. Details as follow:

Time = Distance / speed

Time = 630 / 15

Time = 42 hours

From the calculation made above, we can conclude that the time taken is 42 hours

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