1.How did the amplitude and the latency of the muscle response change when the stimulus polarity was reversed

St. John’s

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Answer:

tôi đoán lagf  pjhAWN ỨNG HÓA HỌC

Explanation:

There are six isomeric alkenes with the formula \(C_5H_10\). These compounds differ in the connectivity of atoms and the location of the double bond.

Alkenes are a class of organic compounds that contain a carbon-carbon double bond (-C=C-). They are also called olefins, which means "oil-forming" in reference to their ability to form oily substances upon reaction with other chemicals. Alkenes have the general formula of CnH2n and are unsaturated hydrocarbons, meaning they have fewer hydrogen atoms compared to their saturated counterparts.

Alkenes are important in various fields, including the chemical industry, agriculture, and medicine. They are used to manufacture a wide range of products, such as plastics, solvents, and synthetic fibers. Alkenes are also used as starting materials for the synthesis of various chemicals, including pharmaceuticals. Due to their unique chemical properties, alkenes can undergo a variety of reactions, such as addition, oxidation, and polymerization.

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question: Please help!!!

If a bottle is being squeezed with a force of 10 Newtons and the area of the bottle is 15

squared inches. What is the pressure??

Answer:

1025.64 N/m²

Explanation:

Pressure: This can be defined as the ratio of force to area. The si unit of pressure is N/m².

From the question,

P = F/A........................ Equation 1

Where F = Force, A = Area.

Given: F = 10 Newtons, A = 15 Squared Inches = (15×0.00065) = 0.00975 m²

Substitute these values into equation 1

P = 10/0.00975

P = 1025.64 N/m²

Hence the pressure of the bottle is 1025.64 N/m²

Answer:

0.66 psi

Explanation:

Given,

The mass of the object, m=2.1 kg

The speed of the object, v=25 m/s

Kinetic energy is the energy that an object possesses due to its motion. And potential energy is the energy that an object possesses due to its position.

The gravitational potential energy depends on the height of the object. As the change in the height of the object is not mentioned in the question, let us assume that there is no change in the potential energy.

The velocity of the object, however, changes. Thus the energy possessed by the object is the kinetic energy.

And the kinetic is given by

On substituting the known values,

Thus the kinetic energy of the ball is 656.25 J

Answer:

The restoring force is Gravity.

Explanation:

In their most basic sense, waves are disturbances that travel through a medium, usually without the permanent displacement of the particles of the medium.

They are generally classified by the disturbing force that causes the wave and the restoring force that returns the water to normal once it has passed.

For example, the disturbing force for wind waves is usually wind and the restoring force is gravity.

Wind provides energy to the water, creating ripples and waves that travel across the surface of the water.

Gravity then acts to restore the surface of the water to its original state, pulling the water back down into the trough of the wave.

As the wave moves through the water, the water itself does not travel with the wave but instead moves in a circular motion, with the circular motion decreasing in size as it moves away from the wave.

This motion of the water is known as an orbital motion, with water particles moving in a circular motion but not traveling with the wave itself.

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A small force exerted over a large time interval can indeed create the same change in momentum as a large force exerted over a small time interval. The statement is True.

The concept that relates force, time, and momentum is known as impulse. Impulse is the product of force and time, and it is equal to the change in momentum experienced by an object.

Impulse = Force × Time

By rearranging this equation, we can see that for a given change in momentum, if the force acting on an object is smaller, the time over which the force is applied will be longer, and vice versa. This demonstrates the principle of conservation of momentum.

As long as the product of force and time remains the same, the change in momentum will be equivalent.

Therefore, a small force exerted over a large time interval can indeed produce the same change in momentum as a large force exerted over a small time interval.

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Answer:

The answer is C

Explanation:

Testable meaning experiments can be conducted to support or refute the hypothesis. This is done through data.

Answer:

False

Explanation:

If you have a strong enough magnetic field all matter is magnetic. But copper is so weakly magnetic that we can't observe it without very, very large magnetic fields. So the short answer is "No, copper isn't magnetic." This can quickly be tested by trying to pick up a penny with a magnet.

BRAINLIST PLS!

Answer:

16

Explanation:

The answer to the given question is option C: 40.4°F. Let's see the explanation below.How to find the temperature difference across a properly operating electric furnace?

]We know that the temperature difference across a properly operating electric furnace is given by:ΔT = (Q / (1.08 * CFM))where,Q is the rate of heat input in BTU/hr,1.08 is the factor to convert CFM to lb/min,and CFM is the rate of air flow in cubic feet per minute.So, here,ΔT = (Q / (1.08 * CFM))

Given,The rate of heat input = 10 kW = 34,120 BTU/hrThe rate of air flow = 900 CFMPlugging these values in the above equation, we get:ΔT = (34,120 / (1.08 × 900))ΔT = 40.4°FTherefore, the temperature difference across a properly operating electric furnace that is using a 10-kW electric heater and is moving 900 cfm of air is 40.4°F. Hence, the main answer is option C.

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The temperature difference across the electric furnace is approximately 30.2°F (option A).

To calculate the temperature difference across the electric furnace, we can use the formula:

Temperature difference (ΔT) = Heat (Q) / (Airflow rate * Specific heat capacity * Density)

First, let's convert the power of the electric heater from kilowatts (kW) to watts (W):

10 kW = 10,000 W

Next, we need to determine the specific heat capacity of air. Typically, it is around 0.24 BTU/lb°F.

Since the given airflow rate is in cubic feet per minute (cfm), we need to convert it to pounds per minute (lb/min) using the density of air. The density of air at standard conditions is approximately 0.075 lb/ft³.

Converting 900 cfm to lb/min:

900 cfm * 0.075 lb/ft³ = 67.5 lb/min

Now we can substitute the values into the formula:

ΔT = 10,000 W / (67.5 lb/min * 0.24 BTU/lb°F * 0.075 lb/ft³)

Simplifying the equation:

ΔT = 10,000 W / (67.5 * 0.24 * 0.075) (lb/min * BTU/lb°F * lb/ft³)

Calculating the result:

ΔT ≈ 30.2°F

Therefore, the temperature difference across the electric furnace is approximately 30.2°F, which corresponds to option A.

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The merry-go-round takes approximately 29.41 seconds to complete 2.00 rotations.

Given data:

Acceleration (α) = 0.135 rad/\(s^2\)

Number of rotations (θ) = 2.00

To find the time taken (t) for 2.00 rotations, we need to use the formula:

θ = 0.5 * α * \(t^2\)

Rearranging the formula, we get:

\(t^2\) = (2 * θ) / α

Plugging in the given values, we have:

\(t^2\) = (2 * 2.00) / 0.135

\(t^2\) = 29.63

Taking the square root of both sides, we find:

t ≈ √29.63

t ≈ 5.439

Therefore, the time taken for the merry-go-round to complete 2.00 rotations is approximately 5.439 seconds.

Note: It's important to round the final answer to an appropriate number of significant figures, considering the given data. In this case, we have used four significant figures in the final answer.

However, if we want to adhere to the given significant figures in the acceleration (0.135 rad/\(s^2\)), the answer should be rounded to three significant figures. In that case, the final answer would be approximately 5.44 seconds.

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The sled will slide horizontally a distance of 18.94 m before coming to a stop.

The horizontal motion of the sled is under the influence of frictional forces acting opposite to the direction of motion. When the sled comes to rest, the frictional force would have done work to bring the sled to a halt.

To find the distance the sled would move, use the work-energy theorem which states that the work done by all the forces acting on a body is equal to the change in the kinetic energy of the body.

Kinetic energy = 1/2mv²where m is the mass and v is the velocity of the body

Initial velocity of the sled = 9.2 m/s

Mass of the sled and students = 120 kg

Coefficient of friction = 0.23There is no vertical motion so the potential energy remains constant and is ignored.The sled starts with kinetic energy equal to the work done by all the forces acting on it. The frictional force does negative work and removes the kinetic energy and bring the sled to a stop.Work done by friction = force × distance.

The force of friction is proportional to the normal force acting on the sled. We do not know the normal force acting on the sled, but we know the gravitational force acting on the sled and this gives the normal force.Force of gravity = mass × acceleration due to gravity = mg.

The normal force = force of gravity × cos (0) = mg × cos (0) = mg.

The angle between the horizontal and the slope is zero, so the angle of inclination is zero.

Work done by friction = force of friction × distance

Work done by friction = frictional force × distance

Work done by friction = μmg × distance

Work done by friction = kinetic energy at start of slide = 1/2mv²

Work done by friction = (1/2)(mass)(initial velocity)²

Work done by friction = (1/2)(120 kg)(9.2 m/s)²

Work done by friction = 5 137.6 J

Frictional force = μmg

Frictional force = (0.23)(120 kg)(9.8 m/s²)

Frictional force = 270.96 N270.96 N × distance = 5 137.6 J

distance = 5 137.6 J/270.96 N

distance = 18.94 m

Therefore, the sled will slide horizontally a distance of 18.94 m before coming to a stop.

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When a rope of length L and mass m is suspended from the ceiling, the tension in the rope at position y can be found using the following expression:

T(y) = mg + λy where g is the acceleration due to gravity, λ is the linear mass density of the rope, and y is the distance measured upward from the free end of the rope.

Here's how to derive the expression: Let's consider an element of length dy of the rope at a distance y from the free end of the rope. The weight of the element is dm = λdy and acts downward. The tension in the rope on the element can be resolved into two components - one acting downward and another acting upward. Let T be the tension in the rope at point y and T + dT be the tension in the rope at point (y + dy).The upward component of tension on the element is given by Tsinθ, where θ is the angle between the element and the vertical. As the rope is assumed to be in equilibrium, the horizontal components of tension balance each other and the net vertical force on the element is zero. Therefore, we have,

Tsinθ - dm g = 0 ⇒ Tsinθ = dm g ⇒ Tsinθ = λdyg

The angle θ can be found using the equation tanθ = dy/dx ≈ dy/dy = 1. Therefore, sinθ = dy/√(dy²+dx²) ≈ dy and we have,T dy = λdyg ⇒ T = λgThis expression gives the tension in the rope at the free end of the rope. The tension in the rope at position y, measured upward from the free end of the rope is given by,T(y) = mg + λy

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Answer:

5

Explanation:

Answer:

1.1 lbs

Explanation:

To convert kg to lbs you multiply kilograms by 2.2. So 0.5kg × 2.2 equals to 1.1 lbs

Guava fruit exhibits several adaptive features that contribute to its survival and reproduction in its environment. Here are five adaptive features of guava fruit:

1)Hard, protective outer layer

2)High vitamin C content

3)Numerous seeds

4)Aromatic scent

5)Tolerance to varied environmental conditions

Hard, protective outer layer: The outer layer of guava fruit is tough and thick, providing protection against physical damage and potential threats from herbivores and pathogens.

High vitamin C content: Guava fruit has a high concentration of vitamin C, which acts as an antioxidant. This feature helps the fruit endure exposure to sunlight and prevents oxidative damage caused by free radicals.

Numerous seeds: Guava fruit typically contains numerous small seeds. This adaptive feature increases the chances of successful reproduction, as more seeds are available for dispersal and potential germination.

Aromatic scent: Guava fruit emits a pleasant and distinct aroma. This scent attracts animals, especially birds and insects, which can aid in seed dispersal by consuming the fruit and subsequently dispersing the seeds through their droppings.

Tolerance to varied environmental conditions: Guava fruit is resilient and can tolerate a range of environmental conditions, including high temperatures, drought, and acidic soils. This adaptability enables guava plants to thrive in diverse habitats and ensures the survival of the fruit in different climates and ecosystems.

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NAD is capable of one or two electron transfers, while FAD is capable of one or two electron transfers.
d. FAD is capable of one or two electron transfers.

NAD and FAD are both electron carriers involved in cellular respiration.

NAD is only capable of transferring two electrons, while FAD can transfer one or two electrons.

This is due to FAD's ability to exist in three different forms, FAD, FADH, and FADH2, whereas NAD exists as either NAD+ or NADH.

NAD (nicotinamide adenine dinucleotide) and FAD (flavin adenine dinucleotide) are coenzymes involved in redox reactions in cells, where they act as electron carriers.

NAD is capable of accepting either one or two electrons depending on the reaction, while FAD can also accept either one or two electrons but is more commonly involved in two-electron transfer reactions.

d. FAD is capable of one or two electron transfers.

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Answer:

kgddfffydyzydydyztztztt

b

The expressions that have the units of kg ⋅ m/s² are as follows: m da/dt, m dv/dt, and m ∫ a dt.

Given: x is position, v is velocity, m is mass, and a is acceleration.

The unit of force is kg m/s², i.e. Newton.

Using the concept of Force, we can analyze which of the given expressions has the units of kg m/s² as follows:

Using Newton's second law of motion, we have

F = ma or a = F/mor m a = F

Differentiating the equation w.r.t time, we get

m (da/dt) = dF/dt ………………………………………(i)

From Newton's third law, we know that every action has an equal and opposite reaction.

Therefore, dF/dt = dp/dt

Where p is momentum.

So, m (da/dt) = dp/dt

Now, we know that the unit of momentum is kg m/s

So, the unit of dp/dt is kg m/s²

This implies that the unit of (da/dt) is m/s²which further implies that the unit of (m da/dt) is kg m/s²

Hence, m da/dt is the correct option that has the units of kg m/s².

Also, m dv/dt can be rewritten as md/dt (dx/dt).

Using product rule of differentiation we can write,

d/dt (mx') = m d/dt x' + x d/dt m = m d²x/dt² + x dm/dt

where x' = dx/dt

Similarly, d/dt (mv) = m d/dt (dx/dt) + v d/dt m = m d²x/dt² + v dm/dt

So, m dv/dt has the unit of kg m/s²

Next, m ∫ a dt can be differentiated w.r.t. time to get m a.

This implies that the unit of m ∫ a dt is kg m/s².

The other options given do not have units of kg m/s².

Therefore, the correct expressions that have the units of kg m/s² are m da/dt, m dv/dt, and m ∫ a dt.

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Answer:

see below

Explanation:

1000 m / 60 s = 16 2/3  m/s

If I were a scientist and I would have wanted to invent and achieve. I would  have wanted to invent a vaccine for cancer disease.

A scientist is somebody who consistently gathers and uses analysis and proof, to create hypotheses and take a look at them, to achieve and share understanding and information. A scientist is additionally outlined by: however they're going concerning this, as an example by use of statistics (statisticians) or information (data scientists).

The only approved treatment vaccine, for advanced pprostate cancer, extends life by simply four months. Some scientists thought cancer vaccines may work higher to stop instead of treat the malady. The HPV vaccine will shield your child's future as a result of it helps stop six varieties of cancer later in life.

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The Sierra Madre Oriental is located at number 4 on the map above; this is easy to remember because “oriental” is the Spanish word for “east.”

Oriental is a term used to describe the cultures, people, and products of the far East, especially those of East and Southeast Asia. It is also sometimes used to describe the cultures of North Africa and the Middle East. In its broadest sense, orientals are any people from the Orient, which is considered to be the regions east of the Mediterranean Sea. The term has also been used to describe aspects of the cultures of the countries within this region.

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Answer:

80 J

Explanation:

PE = mgh

PE = (4 kg)(9.8 m/s^2)(2 m)

PE = 78.4 J and with sig figs, it would be 80 J