An electrical short cuts off all power to a submersible diving vehicle when it is a distance of 29 m below the surface of the ocean. The crew must push out a hatch of area 0.950 m2 and weight 390 N to escape.

If the pressure inside is 1.0atm, what downward force must they exert on the hatch to open it?

Answer:

a) The speed is 61.42 m/s

b) The drag force is 10.32 N

Explanation:

a) The Reynold´s number for the model and prototype is:

[tex]Re_{m} =\frac{p_{m}V_{m}L_{m} }{u_{m} }[/tex]

[tex]Re_{p} =\frac{p_{p}V_{p}L_{p} }{u_{p} }[/tex]

Equaling both Reynold's number:

[tex]\frac{p_{p}V_{p}L_{p} }{u_{p} }=\frac{p_{m}V_{m}L_{m} }{u_{m} }[/tex]

Clearing Vm:

[tex]V_{m} =\frac{p_{p}V_{p}L_{p} u_{m} }{u_{p} p_{m} L_{m} }=\frac{999.1*0.56*8*1.849x10^{-5} }{1.138x10^{-3}*1.184*1 } =61.42m/s[/tex]

b) The drag force is:

[tex]\frac{F_{Dm} }{p_{m}V_{m}^{2}L_{m}^{2} } =\frac{F_{Dp} }{p_{p}V_{p}^{2}L_{p}^{2} } \\F_{Dp} =\frac{F_{Dp}p_{p}V_{p}^{2}L_{p}^{2} }{p_{m}V_{m}^{2}L_{m}^{2} } \\F_{Dp}=\frac{2.3*999.1*0.56^{2} *8^{2} }{1.184*61.42^{2}*1^{2} } =10.32N[/tex]

Answer:

1. The air speed at which wind tunnel should be ran in order to achieve similarity = 61.423 m/s

2. The drag force on the prototype submarine at the conditions given above = 10.325 N.

Explanation:

1. Here we have

Density of water at 15 °C = 999.1 kg/m³

Density of air at 25 °C = 1.184 kg/m³

[tex]\mu_{Water}[/tex] at 15 °C = 1.138 × 10⁻³ kg/(m·s)

[tex]\mu_{Air}[/tex] at 25 °C = 1.849 × 10⁻⁵ kg/(m·s)    

The formula is

[tex]\frac{V_m\times \rho_m \times L_m}{\mu_m} = \frac{V_p\times \rho_p \times L_p}{\mu_p}[/tex]

Where:

[tex]V_m[/tex] = Velocity of the model =

[tex]\rho_m[/tex] = Density of the model medium at the medium temperature = 1.184 kg/m³

[tex]L_m[/tex] = Length of the model = 1/8 × [tex]L_p[/tex] = 0.28 m

[tex]\mu_m[/tex] = Dynamic viscosity of model medium at the model medium temperature = 1.849 × 10⁻⁵ kg/(m·s)

[tex]V_p[/tex] = Velocity of the prototype = 0.560 m/s

[tex]\rho_p[/tex] = Density of the prototype medium at the medium temperature = 999.1 kg/m³

[tex]L_p[/tex] = Length of the prototype = 2.24 m

[tex]\mu_p[/tex] = Dynamic viscosity of prototype medium at the prototype medium temperature 1.138 × 10⁻³ kg/(m·s)

Therefore

[tex]{V_m}{} = \frac{V_p\times \rho_p \times L_p \times \mu_m}{\mu_p\times \rho_m \times L_m}[/tex]

[tex]{V_m}{} = \frac{0.560\times 999.1 \times 2.24 \times 1.849 \times 10^{-5}}{1.138 \times 10^{-3}\times 1.184 \times 0.28}[/tex] =  61.423 m/s

The air speed at which wind tunnel should be ran in order to achieve similarity = 61.423 m/s

2. The drag force on the prototype is given by    

[tex]F_{D.p} = F_{D.m}(\frac{\rho_p}{\rho_m} )( \frac{V_p}{V_m})^2 ( \frac{L_p}{L_m})^2\\[/tex]

Where:

[tex]F_{D.p}[/tex] = Drag force of the prototype

[tex]F_{D.m}[/tex] = Drag force of the model

[tex]F_{D.p} =2.3(\frac{999.1 }{1.184} )( \frac{0.560 }{61.423 })^2 ( \frac{2.24 }{0.28})^2\\[/tex] =   10.325 N

The drag force on the prototype submarine at the conditions given above = 10.325 N.

Answer:

Explanation:

We want to know the percentage of the radio active element after 7half life

Let assume the original mass or quantity of the radioactive element is No

After first half life it remains No/2

Second half life No/4

Third half life No/8

Fourth half life No/16

Fifth half life No/32

Sixth half life No/64

Seventh half life No/128

So after the seventh half life the radioactive element has decay to No/128

Then, the that remain is

The remaining amount / Original amount × 100

%remain = (No/128 / No) × 100

No cancel No

%remain = 100/128

%remain = 0.78%

The minimum potential difference must be supplied by the ignition circuit to start a car is -1800 V

Explanation:

Given data,

E= 3 ×10 ⁶ Δx=0.06/100

We have to find the minimum potential difference

E= -ΔV/Δx

ΔV=- E × Δx

ΔV =-3 ×10 ⁶ . 0.06/100

ΔV=-1800 V

The minimum potential difference must be supplied by the ignition circuit to start a car is -1800 V

Answer:

I can confirm that is the answer

Explanation:

I did the question

the soccer player maintains contact with the ball for approximately 0.0121 seconds.

We can use the impulse-momentum theorem to solve this problem. The impulse-momentum theorem states that the change in momentum of an object is equal to the impulse applied to it. Impulse [tex](\( J \))[/tex] is the product of force[tex](\( F \)) and time (\( \Delta t \)).[/tex]

[tex]\[ J = F \times \Delta t \][/tex]

Given:

- Change in momentum[tex](\( \Delta p \))[/tex]= 11 kg·m/s

- Net force[tex](\( F \))[/tex] = 910 N

Using the formula for impulse, we can rearrange it to solve for time[tex](\( \Delta t \)):[/tex]

[tex]\[ \Delta t = \frac{\Delta p}{F} \][/tex]

Substitute the given values:

[tex]\[ \Delta t = \frac{11 \, \text{kg·m/s}}{910 \, \text{N}} \]\[ \Delta t = \frac{11}{910} \, \text{s} \]\[ \Delta t \approx 0.0121 \, \text{s} \][/tex]

Therefore, the soccer player maintains contact with the ball for approximately 0.0121 seconds.

Answer:

Velocity of the teen = 5m/s

Mass of the truck = 100kg

Explanation:

Momentum can be found with the equation

P = m * v

Where P is momentum in kg*m/s, v is velocity in m/s and m is mass in kg.

Substitute in our values and solve for the unknowns

1.) P = m * v

250 = 50 * v

Divide both sides of the equals by 50 to solve for v

250/50 = v * 50/50

v = 5m/s

2.) P = m * v

20500 = m * 205

Divide both sides of the equals by 205 to solve for m

20500/205 = m * 205/205

m = 100kg

Answer:

The unknown frequency is either 438 Hz or 442 Hz.

Explanation:

The frequency of a beat heard when two sounds with frequencies f₁ and f₂, are played simultaneously, is simply the difference between two frequencies.

b = |f₁ - f₂|

b = 2 Hz

f₁ = 440 Hz

f₂ = ?

440 - f₂ = 2 or 440 - f₂ = -2

f₂ = 438 Hz or 442 Hz

The unknown frequency is either 438 Hz or 442 Hz.

Hope this Helps!!!

Answer:

C. 441 N

Explanation:

Gravitational force between two objects can by calculated by the formula

= G m₁m₂ / r² , m₁ and m₂ are masses at distance r

= ( 6.67 x 10⁻¹¹ x 45 x 5.98 x 10²⁴) / ( 6.38 x 10⁶ )²

= 44.09 x 10

= 440.9 N

= 441 N .  

Answer:

The torque applied to the nut is 34.6 N-m.

Explanation:

Given that,

Length of the wrench, l = 0.5 m

Force applied by the wrench, F = 80 N

The force must be exerted upward and at an angle of 60.0 degrees, with respect to a line from the bolt through the end of the wrench.

Torque applied to the nut is given by :

[tex]\tau=Fr\ \sin\theta\\\tau=80\times 0.5\ \sin(60)\\\tau=34.6\ N.m[/tex]

So, the torque applied to the nut is 34.6 N-m.

Neither technician A nor B. No technician is correct.

Two spark plugs are connected to the ends of one coil in a waste spark ignition system (for a two-cylinder engine) ( for 4 cylinder engine two coils are used, each driving two spark plugs ).

As a result, both spark plugs will light up simultaneously. The first (A) cylinder's compression stroke will ignite one spark plug, while the opposing cylinder's exhaust stroke will fire the second ( wasted ). Cylinder "A" will fire during the exhaust stroke when it is time for cylinder "B" to fire during compression.

Due of the opposing current flow, both spark plugs burn simultaneously from the ends of just one coil. The spark "flows" in this manner from the center to the exterior.

Therefore, Neither technician A nor B. No technician is correct.

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Final answer:

Both Technician A and Technician B are correct; the waste spark ignition system fires two spark plugs at the same time and uses ignition coils connected to companion cylinders. So the correct option is c.

Explanation:

The subject of this question is the waste spark ignition system which is used in internal combustion engines. When evaluating the statements made by Technician A and Technician B, we find that Technician A says that a waste spark ignition system fires two spark plugs at the same time. This is correct as in a waste spark system, each ignition coil fires two plugs simultaneously - one on the compression stroke and the other on the exhaust stroke (which is the 'waste' spark). Technician B says that the system uses ignition coils connected to companion cylinders. This is also correct, as the coils are connected to two cylinders that are at the top dead center at the same time, one on the power stroke, and the other on the exhaust stroke.

Therefore, the answer is:

c. Both technicians A and B

Answer:

B.It is a satellite that collects data about rain and snow

C.Its orbit covers 90 percent of Earth’s surface

F.The sensors measure microwaves

Answer: B, C, F

Explanation:

I got it right

Answer:

B.) Y,W,Z,X

Explanation:

Edge 2021

Assuming letters represent current strengths in descending order, the correct answer for the list ordered from most bright to least bright is option (b) YWZX.

The relationship between the brightness of a light bulb and the current that powers it is such that a brighter bulb corresponds to a greater current when other factors such as voltage and bulb type are held constant.

To order the currents from greatest to least based on brightness, we would start with the highest current and move to the lowest. Since the question does not provide specific current values for W, X, Y, and Z, the best we can do is rely on the principle that higher current leads to greater brightness.

Given this, and assuming that W > X > Y > Z or some similar relationship, the order from most bright to least bright would be from the letter associated with the highest current to the lowest.

So if 'Y' represents the largest current and 'W', 'Z', and 'X' follow in decreasing order, the correct answer would be: (b) YWZX

Answer:

waist circumference

Explanation:

Answer:

3688 km/h

Explanation:

Given:-

- The speed of vehicle relative to earth, vs_e = 3760 km/h

- The relative speed of command and motor, v_c/m = 90 km/h

- The mass of command = m

- The mass of motor = 4m

Find:-

What is the speed of the command module relative to Earth just after the separation?

Solution:-

- Consider the space vehicle as a system that detaches itself into two parts ( command and motor ). We will assume that the gravitational pull due to Earth on the space vehicle is negligible. With that assumption we have our system in isolation. We will apply the principle of conservation of linear momentum on the system as follows:

             Initial momentum = Final momentum

                                       Pi = Pf

                  M*vs_e = m*vc_e + 4m*vm_e

Where,

                  M = m + 4m = 5m

                  vc_e = Velocity of command relative to earth

                  vm_e = Velocity of motor relative to earth  

- We will develop a relation of velocities of command and motor in the frame of earth as follows:

                  vm_e =  v_c/m + vc_e        

- Substituting (vm_e) from Equation 2 into Equation 1, we have:

                  5m*vs_e = m*vc_e + 4m*(v_c/m + vc_e)

                  5m*vs_e = 5m*vc_e + 4m*(v_c/m)

- Solve for vc_e:

                  5m*vs_e -  4m*(v_c/m) = 5m*vc_e

                   vs_e - 0.8*(v_c/m) = vc_e

- Plug in values and evaluate vc_e:

                  vc_e = 3760 - 0.8*(90)

                  vc_e = 3,688 km/h

Answer:

The command module is traveling at 3832 km/h after the separation.

Explanation:

Let's call the mass of the module M, and the mass of the motor is 4M. The total mass of the vehicle, then, is M + 4M = 5M.

Now, momentum = force x distance.

Thus, momentum of the vehicle before separation 3760 x 5M = 18800M kg-km/h.

Let's call the velocity of the motor v. So the velocity of the module must be v + 93.

Now, after the separation, the momentum of the motor will be 4Mv, and the momentum of the module is M(v + 90) = Mv + 90M. The total momentum is 4MV + Mv + 90M = 5Mv + 90M.

From conservation of momentum that says initial momentum equals final momentum, we have;

18800M = 5Mv + 90M

Divide both sides by M to get;

18800 = 5v + 90

18800 - 90 = 5v

18710 = 5v

v = 18710/5

v = 3742 km/h

But v is the velocity of the motor, so we have to add 90 to get the velocity of the module, thus, velocity of module = 3742 + 90 = 3832

So the command module is traveling at 3832 km/h after the separation.

A coefficient called the Avogadro's number is used to calculate the number of atoms in each molecule.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.

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Answer:

The  answer is electromagnetic waves can travel through a region void of matter and mechanical waves cannot (option C)

Explanation:

To begin with, electromagnetic waves are waves that are created due to vibrations between a magnetic and electric field. On the other hand, mechanical waves are waves that are created due to vibration in matter or energy transfer through a material medium.

Electromagnetic waves are quite distinct from mechanical waves because the latter requires a material medium to transport energy while the former does not. In fact, electromagnetic waves can carry out transportation of energy through the vacuum of outer space.

Answer:

See explanation

Explanation:

Acceleration is defined as the change in velocity. In other words, if your velocity changes, then you are accelerating. And since velocity is a vector of both speed and direction, you don't have to be speeding up to be accelerating, you could also just be turning. Hope this helps!

Acceleration is the change in velocity of an object, can involve speed or direction, and is measured as a vector quantity. It is notably expressed in physics by Newton's Second Law, F = ma, and experienced through everyday examples like using a car's accelerator.

In physics, acceleration is defined as the rate at which the velocity of an object changes over time. This can include changes in speed, direction, or both. It is a vector quantity, which means it has both magnitude and direction. Acceleration occurs when a force is applied to a mass, described by Newtons Second Law, with the equation F = ma, indicating that force (F) is the product of mass (m) and acceleration (a). The SI unit for measuring acceleration is meter per second squared (m/s²).

In casual conversation, to 'accelerate' often means simply to speed up. An example of this is using the accelerator pedal in a car, which increases the vehicle's speed. This effect of acceleration, the increase in velocity, conforms to the physical definition, though in a broader sense, acceleration encompasses any change in velocity, not just speeding up.

We usually experience acceleration in daily life through the steady increase in speed due to gravity when an object falls, known in physics as gravitational acceleration. However, acceleration in a technical sense involves any alteration in uniform motion, whether it's a change in speed or a change in direction.

Summary: Acceleration, a change in velocity, signifies a change in either the speed or the direction of an object, veering from its original motion path due to the application of an external force.

Answer:

Technician B is actually correct

The automobile Ignition systems have two circuits that result in a spark being fired at the end of a spark plug. The primary circuit is between the battery and the ignition coil. The secondary circuit is between the ignition coil and the spark plug.

Explanation:

1. The primary circuit carries low voltage. This circuit operates only on battery current and is controlled by the breaker points and the ignition switch. When the ignition key is turned on, a low voltage current from the battery flows through the primary windings of the ignition coil, through the breaker points and back to the battery. This current flow causes a magnetic field to form around the coil.

2. The secondary circuit consists of the secondary windings in the coil, the high tension lead between the distributor and the coil on external coil distributors, the distributor cap, the distributor rotor, the spark plug leads and the spark plugs. As the engine rotates, the distributor shaft cam turns until the high point on the cam causes the breaker points to separate suddenly. Instantaneously, when the points open (separate) current flow stops through the primary windings of the ignition coil. This causes the magnetic field to collapse around the coil. The condenser absorbs the energy and prevents arcing between the points each time they open. This condenser also aids in the rapid collapse of the magnetic field.

Answer:

Net filtration pressure

Explanation:

The net filtration pressure is the outward pressure minus the inward pressure. Figure of a glomerular capsule with glomerular hydrostatic pressure, blood colloid osmotic pressure, and capsular hydrostatic pressure.

The sum of all of the influences, both osmotic and hydrostatic, results in a net filtration pressure (NFP) of about 10 mm Hg. A proper concentration of solutes in the blood is important in maintaining osmotic pressure both in the glomerulus and systemically.

Answer:

variations in great horned owl body size due to food supply can be acted on by natural selection.

Explanation:

Natural selection can help select great horned owl with smaller body size since it's an advantage in a place with smaller available food sources, compared to a bigger body size that will need more food. At first, birds with smaller body survive while those bigger ones die out, and the smaller birds pass on this genes to their offspring.

Answer:

variation in body size due to inherited traits can be acted on by natural selection

Explanation :

Variations in body size in body size due to inherited trait can be acted upon by natural selection by favoring the size that is best suited for the survival of the species. Those with these genes survive and pass it on to their offspring, while those with the unfavorable body size are wiped out.

Variations in body size of the Great Horned Owl can be acted on by natural selection, both due to food supply and inherited traits.

Variations in body size of the Great Horned Owl due to food supply can be acted on by natural selection. When there is a shortage of food, smaller individuals with less energy requirements may be favored, while in times of plenty, larger owls with higher energy needs may have an advantage. On the other hand, variation in body size due to inherited traits can also be acted on by natural selection.

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Answer:

south

Explanation:

The box will be pushed by Person A and so the box will move with magnitude of 10 N force and in left direction.

Explanation:

So in the present problem, three forces are acting on the box. The force exerted by Person A on the box is represented as F₁ and it is given as 10000 N. Similarly, the net force exerted by Person B and friction on the box is given as 9990 N and it is represented as F₂. Since, F₁ is acting toward left side and F₂ is acting toward right side, both the force will be acting opposite to each other. Then the net force of all the three force acting on it will be the difference between F₁ and F₂ and the box will move towards the direction of maximum force.

[tex]Net force = 10000-9990 = 10 N[/tex]

Thus, the magnitude of the net force acting on the box will be 10 N and as the force exerted by Person A on the box is greater than the combined force of Person B and friction, the box will move towards left side as exerted by Person A.

So the box will be pushed by Person A and so the box will move with magnitude of 10 N force and in left direction.

Answer:

Explanation:

Mechanical Advantage = Outputforce / inputForce

outputforce = 400 X 3 = 1200

Mechanical Advantage = 1200 / 100

MA = 12

Answer:

(a) orbit the galactic center just as fast as stars closer to the center.

Explanation:

The orbital speed is defined as:

[tex]v = \sqrt{\frac{G M}{r}}[/tex]  

Where v is the orbital speed, G is the gravitational constant, M is the mass of the supermassive black hole, and r is the orbital radius.

If the distance increase the orbital speed decreases (inversely proportional).

However, the results of the measurements of the orbital speed of the star in the outskirts of the Milky way show that in fact, they orbit the galactic center as fast as the star closer to the center.  

Dark matter in the other hand was born to explain why stars that were farther from the supermassive black hole in the center of the Milky Way galaxy didn't decrease its orbital speed as it was expected since the contribution of more matter in that region is the only explanation to that weird behavior.

Answer:

Can we please have the options for the drop down menu

Explanation:

Answer:

Before a tornado warning occurs, you should Have a disaster plan ready

If you’re indoors during a tornado, you should go to the basement

If you’re outdoors during a tornado, you should  lie in a ditch or low-lying ditch

Answer:

In physical sciences, mechanical energy is the sum of potential energy and kinetic energy. It is the energy associated with the motion and position of an object.

Explanation:

Answer:

Mechanical Energy is Kinetic energy + the Potential Energy.

Explanation:

ME=KE+PE

Answer:

Because of unstable membrane potentials

Explanation:

Autorhythmic cells are specialized cardiac muscle cells in the heart from which electrical impulses called action potentials originate. These cells can generate electrical impulses without any external simulations by the nerve cells. I.e. they are self – excitable.

Autorhythmic cells spontaneously create action potentials because they have an unstable resting or membrane potentials that continuously depolarizes, drifting slowly toward threshold. As sodium ions enter the cell, the inner surface of the plasma membrane gradually becomes less negative, generating the pacemaker potential.

Though their is an influx of sodium ions into the cell, the basic reason for the spontaneous generation of action potentials solely because of unstable membrane potentials. and not majorly due to the influx of sodium ion.

Autorhythmic cells can generate action potentials spontaneously due to the presence of L-type Ca2+ channels.

Autorhythmic cells are a type of specialized cells found in the heart. Unlike regular cardiac muscle cells, autorhythmic cells can generate action potentials spontaneously without external stimuli. This is due to the presence of L-type Ca2+ channels.

These channels allow the entry of calcium ions, which triggers the depolarization phase of the action potential. The influx of calcium ions leads to the opening of voltage-gated potassium channels and closure of calcium channels, helping restore the resting membrane potential.

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Answer:

the answer is in the question 80 km in an hour

Explanation

The average speed of a train that travels 80 km in 1 hour, 200 km in 2 hours, and 420 km in 4 hours is 100 km/h, calculated by dividing the total distance (700 km) by the total time (7 hours).

The student is asking about how to calculate the average speed of a train that covers different distances over different time intervals. To find the average speed, we need to combine the total distance traveled with the total time taken.

First, we add up all the distances: 80 km + 200 km + 420 km = 700 km.
Then, we add up all the time intervals: 1 h + 2 h + 4 h = 7 h.
Finally, we divide the total distance by the total time to get the average speed:

Average speed = Total distance / Total time = 700 km / 7 h = 100 km/h.

The average speed of the train over the entire journey is 100 km/h.

Answer:

Their number should increase

Explanation:

The photoelectric effect is a phenomenon that causes the ejection of electrons from that metal as light shined onto a metal surface. Only certain frequencies of light can cause the ejection of electrons. However, if the frequency of the incident light is too low then no electrons were ejected even if the intensity of the light was very high. If the frequency of the light was higher then electrons were able to be ejected from the metal surface even if the intensity of the light was very low.

According to the accepted wave theory, light of any frequency will cause electrons to be emitted. Kinetic energy emitted by the electrons depends upon the intensity of light.

According to the accepted wave theory, number of electrons being ejected by the metal should increase

The correct option is Their number should increase. According to classical wave theory, an increase in light intensity should increase the number of ejected electrons in the photoelectric effect. However, experiments show that the kinetic energy depends on the light's frequency, not intensity.

The phenomenon being described here is known as the photoelectric effect, which is a key piece of evidence for the particle nature of light. The classical wave theory of light predicted that the kinetic energy of ejected electrons should increase with the intensity of the light.

However, experiments have shown that the kinetic energy of the ejected electrons depends on the frequency of the light, not its intensity, and no electrons are ejected below a certain threshold frequency, regardless of the light's intensity.

Given the choices in the question, none exactly match the expectations from classical wave theory. However, based on the wave theory, one might erroneously expect that as the intensity of light increased, the number of ejected electrons (if any) would increase, which is the closest option provided.