Question 21
Sensitivity to radiation is probably highest:
a. Just prior to pregnancy
b. During fetal development
c. During puberty
d. During young adulthood

To calculate the current associated with an NCV pulse, we need to know the information about an axon's potential, resistance per unit length, and length.

This is because electrical signal travel through axons, which can be modeled as electrical circuits. Ohm's Law, I = V/R, can be applied to calculate the current, where V is the potential difference and R is the resistance per unit length of the axon. The length of the axon is also needed to determine the overall resistance. Therefore, understanding the electrical properties of axons, such as their potential and resistance, is crucial in calculating the current associated with an NCV pulse.

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The statement is Rabbits consume shrubs and are parasites of grasses.

Consumers can be distinguished based on where they are in the food chain: first order (primary) consumers consume producers; second order (secondary) consumers consume primary consumers; third order (tertiary) consumers consume secondary; and so on.

Trophic levels refer to the various feeding positions within a food chain or web. Producers make up the first trophic level, followed by primary consumers, secondary consumers, and so forth. A food chain or web typically only has four or five trophic levels.

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Complete question;-

Which statement does NOT describe a relationship shown in the food web?

A Elk are prey for mountain lions.

B Mice are herbivores that consume grasses and are preyed on by snakes.

C Owls prey on rabbits and frogs.

D Rabbits consume shrubs and are parasites of grasses.

PLEASE HELP

The train will travel approximately 429.2 meters before coming to rest.

Use the following terms and equations:

1. Mass (m) = 95170 kg
2. Initial velocity (v₀) = 26.8 m/s
3. Maximum braking force (F) = 80.0 kN = 80000 N
4. Distance before coming to rest (d)

First, we need to find the deceleration (a) using Newton's second law: F = ma. Rearranging the equation, we get a = F/m:

a = 80000 N / 95170 kg ≈ -0.840 m/s² (negative sign indicates deceleration)

Next, we'll use the following equation of motion to find the distance (d) traveled before coming to rest: v² = v₀² + 2ad. Since the final velocity (v) will be 0 when the train comes to rest, we can rearrange the equation to solve for d:

d = (v² - v₀²) / 2a

d = (0 - (26.8 m/s)²) / (2 * -0.840 m/s²)

d ≈ 429.2 m

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In general, the voltage limitation between conductors in a surface metal raceway shall not exceed 600 volts unless the metal has a thickness listed for higher voltage.
In general, the voltage limitation between conductors in a surface metal raceway shall not exceed _____ volts unless the metal has a thickness listed for higher voltage.

The voltage limitation between conductors in a surface metal raceway shall not exceed 600 volts unless the metal has a thickness listed for higher voltage.

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The final velocity of the toy car is 0.2 m/s. Therefore, none of the given option is correct.

We can apply the theory of mechanical energy conservation to determine the toy car's final velocity. When the spring is squeezed, the system's initial mechanical energy is stored there as potential energy. This potential energy is transformed into kinetic energy as the spring is released, launching the toy car.

The following formula can be used to determine the potential energy held in the spring:

Potential energy (PE) = 1/2 * k * x²

where x is the spring's compression distance and k is the spring's force constant. Adding the specified values:

k = 40 N/m

x = 0.02 m (since the spring is compressed by 2 cm which is equivalent to 0.02 m)

PE = 1/2 * 40 * (0.02)²

PE = 0.004 J

The toy car transforms this potential energy into kinetic energy. The following equation can be used to determine an object's kinetic energy:

Kinetic energy (KE) = 1/2 * m * v²

where m is the mass of the object and v is its velocity. Plugging in the given values:

m = 0.2 kg

KE = 0.004 J

0.004 = 0.5 * 0.2 * v²

v² = 0.004 / (0.5 * 0.2)

v² = 0.04

v = √0.04

v = 0.2 m/s

So, the final velocity of the toy car would be 0.2 m/s.

Therefore, none of the option is correct.

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The correct statements are: forces are measured in newtons and a force is a push or pull.

1. All applications of forces require contact between two objects.
- Incorrect. There are non-contact forces, such as gravitational and magnetic forces, that do not require direct contact between objects.
2. Forces are measured in Newtons.
- Correct. The unit used to measure force is the Newton (N).
3. A force is a scalar.
- Incorrect. A force is a vector quantity, not a scalar. This means that it has both magnitude and direction.
4. A force is a push or pull.
- Correct. Forces are interactions that result in a push or pull on objects, causing them to change motion or remain stationary.
In summary, statements 2 and 4 are correct, while statements 1 and 3 are incorrect.

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At the moment the ball has zero velocity, it is at the highest point of its trajectory and its direction of motion has changed from upward to downward.

Therefore, the acceleration of the ball at that moment is equal to the acceleration due to gravity, which is approximately 9.8 m/s^2 downwards. This acceleration is constant throughout the ball's motion and acts in the direction opposite to its motion.
The acceleration of the ball when its velocity is zero: At the moment the ball has zero velocity, which occurs at the highest point of its trajectory, its acceleration remains constant at approximately -9.81 m/s². This acceleration value is due to Earth's gravity, acting downward (negative direction) on the ball.

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True. In the emergency heat mode, the auxiliary heat source (such as electric resistance coils) becomes the primary heat source and the compressor is disabled.

This mode is typically used when the regular heat pump system is malfunctioning or unable to keep up with extreme cold temperatures. When a heat pump is used in conjunction with gas or oil auxiliary heating, the heat pump coil must be placed downstream the furnace.

The heat pump coil is situated underneath the furnace for a reason.

This is because the heat pump coil needs to be able to extract heat from air that has already been heated by the auxiliary heat source rather than air that is drawn into the boiler from the outside.

If the heat pump coil was positioned on the downstream side of the furnace, the efficiency and performance of the heat pump system would be reduced.

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The heating element of a hair dryer dissipates 1500 w when connected to a 160 v outlet. The resistance of the heating element of a hair dryer is 17.07 ohms.


We can use Ohm's law to find the resistance of the heating element of a hair dryer. Ohm's law states that the resistance of a conductor is equal to the voltage across it divided by the current flowing through it.
In this case, we know that the power dissipated by the heating element is 1500 W and the voltage across it is 160 V. We can use the formula for power, which is power = voltage x current, to find the current flowing through the heating element.
1500 W = 160 V x current
Solving for current, we get:
Current = 9.375 A
Now we can use Ohm's law to find the resistance:
Resistance = Voltage / Current
Resistance = 160 V / 9.375 A
Resistance = 17.07 ohms (rounded to two decimal places)  

Therefore, the resistance of the heating element of a hair dryer is 17.07 ohms, when connected to a 160 V outlet.

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On Indoor Vertical Farms the Future of Agriculture:

Indoor vertical farming is necessary for several reasons. Firstly, it allows for year-round crop production in a controlled environment, which can increase crop yields and reduce the impact of climate change on agriculture.

Secondly, it can be done in urban areas, reducing the need for transportation of food over long distances, and providing fresh produce to urban populations. Additionally, it could provide new job opportunities and help address food insecurity in areas with limited access to fresh produce.

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Any excavation in clay, loam, silt, or sand more than 5 feet in depth should have side wall protection to prevent a cave-in. Therefore, the correct answer is option A) 5 feet.

Excavation work involves digging, moving, or removing soil, rock, or other materials from the ground to create a hole, trench, or foundation for construction or other purposes. Excavation work can be hazardous, particularly when workers enter or work around trenches or excavations.

Cave-ins are one of the most common and deadly excavation hazards. When soil is excavated from the ground, the sides of the excavation can become unstable and collapse, trapping workers underneath. This can cause serious injury or death.

To prevent cave-ins, OSHA (Occupational Safety and Health Administration) requires that all excavations 5 feet or deeper be protected by a protective system. The protective system can be either sloping and benching, shoring, or shielding. Sloping and benching involve cutting back the sides of the excavation to create a slope or series of steps to prevent cave-ins. Shoring involves installing supports, such as hydraulic or mechanical braces, to prevent cave-ins. Shielding involves using trench boxes or other types of protective systems to prevent soil from falling or rolling into the excavation.

In addition to using protective systems, it is important to conduct regular inspections of the excavation site, to train workers on safe excavation practices, and to implement a rescue plan in case of an emergency. Following these safety procedures can help prevent cave-ins and other excavation-related accidents, and ensure the safety of workers on the job site.

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the light reflected from the water's surface will be completely polarized at an angle of reflection of approximately 53.1°.

The angle of reflection at which light will be completely polarized depends on the angle of incidence and the index of refraction of the medium the light is reflecting from. In this case, the scuba diver is observing light reflecting from the surface of water, which has an index of refraction of 1.333.
For light reflecting from a surface at a certain angle of incidence, the angle of reflection at which the light is completely polarized can be calculated using the Brewster's angle equation:
tan θp = n2/n1
where θp is the Brewster's angle (the angle of reflection at which the light is completely polarized), n1 is the index of refraction of the incident medium (air in this case), and n2 is the index of refraction of the reflecting medium (water in this case).
Plugging in the values, we get:
tan θp = 1.333/1
θp = tan^-1 (1.333)
θp ≈ 53.1°
Therefore, the light reflected from the water's surface will be completely polarized at an angle of reflection of approximately 53.1°.

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If the body temperature was 10°C, the approximate time of death would be between 12 and 36 hours, depending on the surroundings and other variables.

However, it's crucial to note that the time of death can be influenced by several factors like the environment, clothing, and the person's physical state. The time of death can also be estimated by measuring the body temperature, also known as algor mortis.

After death, the body temperature decreases at a rate of roughly 1.5°C per hour, though this might change depending on the surroundings and other variables. It is impossible to pinpoint the exact time of death if the body temperature was 10°C, although it may indicate that death happened several hours earlier because the body temperature will continue to drop after death.

However, other techniques, like lividity, rigor mortis, and inspection of the stomach contents, are more accurate, hence it is not advised to utilize this method alone to establish the time of death. For a more precise estimation of the time of death, a forensic specialist should be consulted.

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According to Terminal Rating (110-14(C)(1)), the minimum size THHN conductor required for a 150 ampere circuit breaker or fuse is 1/0 AWG.

However, it is important to comply with the requirements of Section 110-14(C)(2), which states that the conductor must be sized to carry at least 125% of the continuous load or 100% of the non-continuous load. Therefore, the actual minimum size THHN conductor required for a 150 ampere circuit breaker or fuse would be calculated as follows:
Continuous Load = 150 amperes
125% of Continuous Load = 1.25 x 150 = 187.5 amperes
Minimum THHN Conductor Size = 1/0 AWG (satisfies 187.5 amperes)
So, to meet the requirements of both Terminal Rating (110-14(C)(1)) and Section 110-14(C)(2), the minimum size THHN conductor required for a 150 ampere circuit breaker or fuse is 1/0 AWG.

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The gravitational potential energy gained by the girl can be calculated as: PE = mgh

where m is the mass of the girl, g is the acceleration due to gravity (9.8 m/s^2), and h is the height climbed (18 m).

PE = (33 kg)(9.8 m/s^2)(18 m) = 5,662.4 J

The time taken to climb the rope is t = 27 s. Therefore, the average power (P) of the girl can be calculated as:

P = PE / t

P = 5,662.4 J / 27 s ≈ 209.34 W

Therefore, the average power of the girl is approximately 209.34 watts.

To calculate the average power, we use the formula:

Power = Work / time

where Work is the amount of work done, and time is the time it took to do the work.

To find the work done by the girl, we need to calculate the gravitational potential energy she gained by climbing the rope:

Potential Energy = mgh

where m is the mass of the girl, g is the acceleration due to gravity, and h is the height climbed.

Plugging in the values, we get:

Potential Energy = (33 kg) x (9.81 m/s^2) x (18 m) = 5,997.06 J

Now we can calculate the average power:

Power = Work / time = 5,997.06 J / 27 s = 222.11 W

Therefore, the girl's average power while climbing the rope is approximately 222 W.

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Polyvinyl chloride (PVC) has the lowest normal maximum working pressure among the listed pipe types. PVC pipes are commonly used for household plumbing and irrigation systems, but they are not suitable for high-pressure applications due to their lower strength and durability compared to other pipe materials.

The working pressure of PVC pipes typically ranges from 100 to 150 psi, which is much lower than the working pressure of ductile iron, reinforced concrete, and high-density polyethylene pipes.

PVC is available in two fundamental types: rigid (sometimes referred to as RPVC) and flexible. PVC in its rigid form is employed in pipe construction as well as in profile applications like doors and windows. Additionally, it is utilised in the production of plastic bottles, non-food packaging, food-covering sheets, and plastic cards (like bank or membership cards). Plasticizers, the most popular of which are phthalates, can be added to make something softer and more flexible. It is also used in this form for flooring, signage, phonograph records, inflatable items, plumbing, electrical wire insulation, imitation leather, and many other uses where rubber is replaced. It is used with cotton or linen to make canvas.

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A warning tag attached to a locked-out switch should contain the following information: c. Signature of the person who locked out the switch and who will remove it. This ensures proper identification and responsibility for the lockout process, promoting safety and accountability in the workplace.

A warming tag is a type of tag that is attached to a locked-out switch. According to the Occupational Safety and Health Administration (OSHA), a warming tag attached to a locked-out switch should contain the signature of the person who locked out the switch and who will remove it.

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During photosynthesis, the hydrogen atoms come from water molecules that are split apart by light energy in the process called photolysis. The oxygen atoms, on the other hand, come from the same water molecules as the hydrogen atoms. They are released into the atmosphere as a by-product of photosynthesis. So, both the hydrogen and oxygen atoms that become part of the glucose molecule come from water molecules.

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The closest answer to this is 7.79 × [tex]10^{-3}[/tex] qt (option D).

The density of mercury is 13.6 g/[tex]cm^{3}[/tex]. To find the volume occupied by 100 g of Hg, first, we need to calculate the volume in cubic centimeters ([tex]cm^{3}[/tex]
) using the formula:
Volume ([tex]cm^{3}[/tex] = mass (g) / density (g/[tex]cm^{3}[/tex])
Volume ([tex]cm^{3}[/tex] = 100 g / 13.6 g/[tex]cm^{3}[/tex] = 7.35 [tex]cm^{3}[/tex]
Now, we need to convert the volume from cubic centimeters to quarts using the given conversion factor (1 L = 1.06 qt). First, convert [tex]cm^{3}[/tex]to liters (1 L = 1000 [tex]cm^{3}[/tex]):
Volume (L) = 7.35 cm3 * (1 L / 1000 [tex]cm^{3}[/tex]) = 0.00735 L
Now, convert liters to quarts:
Volume (qt) = 0.00735 L * (1.06 qt / 1 L) ≈ 0.00779 qt
Therefore the answer is answer is 7.79 × [tex]10^{-3}[/tex] qt

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True. When circuit conductors are run in parallel, each raceway must have an equipment grounding conductor that is sized based on the overcurrent protection device protecting the circuit.

This ensures that the equipment is grounded properly and can safely handle any electrical faults or surges.
When equipment grounding conductors are installed with circuit conductors that are run in parallel, each raceway must have an equipment grounding conductor sized according to the overcurrent protection device protecting the circuit. This ensures proper grounding and protection for the electrical system.

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Switches made out of semiconductors made computers possible, but lately, when it comes to high tech, there's a new family on the block, the "rare earth elements," which are 15 elements located near the bottom of the periodic table.

These elements play a crucial role in modern technologies and have unique properties that make them essential for various applications. It's worth noting that rare earth elements are not typically used to make switches, but rather they are used in a variety of high-tech applications, including electronics, magnets, batteries, and more. While semiconductors made of silicon are still widely used in computer technology, rare earth elements have become increasingly important in a variety of high-tech applications due to their unique magnetic and optical properties. They are used in products such as wind turbines, electric vehicles, smartphones, and more.

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When a capacitor is said to be charged, it means that it has stored electrical energy in its electric field.

A capacitor is an electronic component that can store electrical energy in its electric field. When a voltage is applied across the capacitor, it charges up by storing electrons on one plate and removing them from the other plate. The capacitor continues to charge until the voltage across it reaches the same level as the voltage applied to it. At this point, the capacitor is said to be fully charged, and it has stored a specific amount of energy based on its capacitance and the applied voltage.

When the capacitor is connected to a circuit, it can discharge its stored energy back into the circuit, providing a burst of electrical energy to power a device or perform other tasks.

Capacitors are commonly used in a variety of electronic devices, such as radios, TVs, computers, and power supplies, to store and regulate electrical energy.

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The direction of the frictional force on the tires of a front-wheel-drive car as the speed increases on a horizontal road is opposite to the direction of the car's motion.

This is because the tires need to grip the road surface to provide the necessary traction to move the car forward, and the frictional force acts in the opposite direction to the movement of the car.

The amount of frictional force depends on several factors such as the weight of the car, the quality of the tires, the road conditions, and the speed of the car. In a front-wheel drive car, when the speed is increasing on a horizontal road, the direction of the frictional force on the front tires is forward, as they provide the necessary traction for acceleration.

On the rear tires, the frictional force acts in the opposite direction, or backward, as they resist the forward motion while supporting the weight of the car.

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The emf amplitude of the rotating coil with 60 Hz frequency, 1000 turns, 20 cm2 area, and 2.0*10^-2 T field is 24 V.

The magnetic flux through the coil can be calculated as the product of the magnetic field, the cross-sectional area of the coil, and the number of turns in the coil:

Φ = B * A * N

where Φ is the magnetic flux, B is the magnetic field, A is the cross-sectional area, and N is the number of turns in the coil.

In this problem, we are given that the coil rotates at 60 revolutions per second in a field of 2.0*10^-2 T. This means that the magnetic flux through the coil changes at a rate of:

dΦ/dt = B * A * N * dθ/dt

where dθ/dt is the angular velocity of the coil in radians per second. Since the coil rotates at 60 revolutions per second, we can convert this to radians per second by multiplying by 2π:

dθ/dt = 60 * 2π = 376.99 rad/s

Substituting the given values, we get:

dΦ/dt = (2.0*10^-2 T) * (20 cm^2) * (1000 turns) * (376.99 rad/s) = 301.6 V/s

The emf induced in the coil is equal to the rate of change of magnetic flux, so:

emf = -dΦ/dt = -301.6 V/s

The negative sign indicates that the direction of the induced emf is opposite to the direction of the change in magnetic flux. Through a process known as electromagnetic induction, a rotating coil may produce an electrical current. This is due to the fact that a conductor, like a coil, undergoes a change in magnetic flux when it travels through a magnetic field. A current may start to flow as a result of the electromotive force (EMF) that this change in flux creates in the conductor.

Therefore, the amplitude of the emf of the coil is 301.6 volts.

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The resistivity of the wire is 2.7 x 10^-8 Ωm.

The resistivity of the wire is found to be 2.7 x 10^-8 Ωm by calculating the current flowing through it using the current density equation, multiplying the current density of 1.4x10^8 A/m^2 by the cross-sectional area of the wire, calculating the resistance of the wire using Ohm's law, and calculating the resistivity of the wire using the equation ρ = RA/L, where R is the resistance, A is the cross-sectional area of the wire, and L is its length, and substituting the values we have calculated.

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30N is the net force on the block of ice for a large block of ice is being pushed on a frozen pond by layla and nadia

The net force on the block of ice is the result of combining the forces pushing in opposite directions. Layla pushes to the right with a force of 40 N, while Nadia pushes to the left with a force of 70 N. To find the net force, we need to subtract the smaller force from the larger force, since they are in opposite directions.

When forces are in balance, there is no net force, hence there is no net force.

There is either no movement or steady movement when something is in balance.

Equal in size and directed in the opposite direction, balanced forces are. When forces are evenly distributed, motion remains unchanged.
So, the net force on the block of ice is:
70 N (Nadia's force) - 40 N (Layla's force) = 30 N
Therefore, the net force on the block of ice is 30 N to the left, since Nadia's force is greater than Layla's force.

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The angular velocity of the sphere at the bottom of the inclined plane is 9.9 rad/s.

Angular velocity is a measurement of how quickly an object rotates in a given amount of time. It is measured in radians per second (rad/s) and is a vector quantity that includes both magnitude and direction. Angular velocity is the rate of change of angular displacement and is the derivative of angular position with respect to time.

To solve this problem, we can use the equation for conservation of energy:
KE + PE = 0
Where KE is the kinetic energy, PE is the potential energy, and 0 is the total energy at the bottom of the inclined plane.
KE = 0.5mv²
PE = mgh
We can rearrange the equation to solve for the angular velocity, v:
v = √(2gh/m)
Plugging in the given values, we get:
v = √(2*9.8*7.0/2.0) = 9.9 rad/s.
Therefore, the angular velocity of the sphere at the bottom of the inclined plane is 9.9 rad/s.

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The main valve in a pilot-operated four-way reversing valve is moved by pressure created by the difference in low and high side pressure.

The metering device plays a role in regulating the flow of refrigerant, but it is not directly involved in operating the valve. The valve is controlled by a pilot valve that responds to pressure differences in the system, allowing the valve to switch between different flow paths as needed.

The main valve in a pilot-operated four-way reversing valve is moved by pressure created by d. low and high side pressure difference. This pressure difference allows the valve to be operated effectively, ensuring proper metering and flow control within the system.

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The specific heat can be calculated by calculating how much the temperature in the water rises.

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A cross-connection is a link between "unapproved" water sources and potable water sources. Hence option C is correct.

A cross-connection in plumbing is a connection between a system that provides potable water and any other system or source that provides non-potable water or other substances.

Cross-connections could result in health risks for users by allowing pollutants or toxins to enter the potable water system. To safeguard the public water supply, cross-connections must be located, deleted, or managed by the installation of backflow protection devices.

So, the correct answer is option C that says, "A connection between potable water and unapproved water supplies."

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