Why is it important to scientists for a hypothesis to be testable? How would the experiment differ if it were not? What is an example of each type? Write 3-5 sentences

Answer:

5 seconds

Explanation:

The vertical position of the ball will be given by the equation

df = do + vo t + 1/2 a t^2        df = final position  = 0  ( on the ground

                                              do = original position  ( 25 m )

                                               vo = original velocity (+ 20 m/s)

                                                a = - 10 m/s^2

So this becomes

0 = 25 + 20 t  - 1/2 (10)t^2      

  =  - 5 t^2 +20 t + 25             Use Quadratic Formula   a = -5    b=20  c = 25

                                                      to find the positive value of t = 5 seconds

Answer:

The Potential Energy At The Bottom Of The Waterfall is270000J

The technique that uses a radio frequency wave to excite hydrogen atoms in the brain to create an image of the living human brain is called magnetic resonance imaging (MRI).

MRI is a non-invasive medical imaging technique that provides detailed structural and functional information about the brain. It relies on the principle of nuclear magnetic resonance (NMR), which involves the behavior of atomic nuclei in a magnetic field.

During an MRI scan, the patient is placed inside a strong magnetic field, which aligns the hydrogen atoms in the body, particularly those in water molecules, in a specific direction. Radio frequency pulses are then applied, causing the hydrogen atoms to absorb and emit energy. These emitted energy signals are detected by the MRI machine and used to construct a detailed image of the brain.

By analyzing the signals from different regions of the brain, MRI can produce high-resolution images that reveal the brain's anatomical structures and detect abnormalities or pathologies. It is widely used in clinical settings for diagnosing various conditions, such as tumors, strokes, multiple sclerosis, and traumatic brain injuries. Additionally, functional MRI (fMRI) can also be performed to study brain activity by measuring blood flow changes associated with neural activity, enabling researchers to map brain functions and understand cognitive processes.

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Answer:

There is direct evidence that the weak and electromagnetic forces were once unified as a single electroweak force from the study of subatomic particles.

Explanation:

The discovery of the W and Z bosons, which are particles that mediate the weak nuclear force, provided strong evidence that the weak force was once part of a larger electroweak force. The fact that the W and Z bosons have electric charge, and that their masses are related to the masses of the photon (the particle that mediates the electromagnetic force), supports the idea that the weak and electromagnetic forces were once part of a single electroweak force. Additionally, the mathematical symmetry of the electroweak theory, which unifies the weak and electromagnetic forces, provides further evidence for this theory.

Answer:

A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure. A liquid is made up of tiny vibrating particles of matter, such as atoms, held together by intermolecular bonds.

answer:

the electromagnetic force

explanation:

velocity of the boy in the cannon is 28 meters per second.

Period and frequency are two terms that are commonly used in physics, especially when it comes to waves. The period of a wave refers to the time it takes for one complete cycle of the wave to occur. This can be measured in seconds or any other unit of time. On the other hand, the frequency of a wave refers to the number of cycles that occur in a given amount of time. This is usually measured in hertz (Hz), which represents the number of cycles per second.
To understand the relationship between period and frequency, we can use the formula:
f = 1/T
where f is the frequency in hertz and T is the period in seconds. This means that the frequency and period are inversely proportional to each other. As the period increases, the frequency decreases, and vice versa.When it comes to light, period and frequency are related to the color of the light. Different colors of light have different frequencies, and therefore different periods. For example, red light has a longer wavelength and a lower frequency than blue light, which has a shorter wavelength and a higher frequency. This is why we see different colors when we look at a rainbow or a prism.Now, let's move on to the second part of your question. The momentum of an object can be calculated using the formula:p = mvwhere p is the momentum in kilogram-meters per second (kg-m/s), m is the mass in kilograms (kg), and v is the velocity in meters per second (m/s).
To find the velocity of the boy in the cannon, we can rearrange the formula to solve for v:
v = p/m
Plugging in the given values, we get:
v = 1540 kg-m/s / 55 kg
v = 28 m/s
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The magnitude of the force is -9.44 * 10^-13 * B where B is the magnetic field.

The force exerted on a charged particle in a magnetic field is given by the equation:

F = q * v * B

where q is the charge of the particle, v is its velocity, and B is the magnetic field.

Since an electron has a charge of -1.6 x 10^-19 C, the magnitude of the force exerted on it by the magnetic field is:

F = q * v * B = -1.6 x 10^-19 C * v * B

To find the velocity of the electron, we can use the equation for the work

done by an electric field on a charged particle:

W = q * V

where W is the work done, q is the charge of the particle, and V is the potential difference.

Since the work done is equal to the change in kinetic energy of the particle, we have:

W = (1/2) * m * v^2, where m is the mass of the electron

So,

q * V = (1/2) * m * v^2

Solving for v, we get:

v = sqrt(2 * q * V / m)

Plugging in the values, we get:

v = sqrt(2 * -1.6 x 10^-19 C * 100 V / 9.11 x 10^-31 kg) = 5.9 x 10^6 m/s

Finally, the magnitude of the force exerted on the electron by the magnetic field is:

F = q * v * B = -1.6 x 10^-19 C * 5.9 x 10^6 m/s * B = -9.44 * 10^-13 * B

The value of the magnetic field B must be specified in order to find the exact value of the force.

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Answer: To calculate the horizontal distance of the bomber from the target when a bomb is released, we need to consider the constant velocity of the bomber and the time it takes for the bomb to fall from the height of the bomber to the ground.

We can use the following formula to calculate the horizontal distance traveled by an object moving at a constant velocity:

Distance = velocity * time

We can also use the formula for the distance traveled by an object falling under the influence of gravity:

Distance = initial velocity * time + (1/2) * acceleration * time^2

In this case, the initial velocity is 0, since the bomb is being released from rest at the height of the bomber. The acceleration due to gravity is 9.8 m/s^2.

To find the time it takes for the bomb to fall from the height of the bomber to the ground, we can set the distance traveled equal to the height of the bomber (100m) and solve for time:

100m = (1/2) * 9.8 m/s^2 * time^2

time = sqrt(100m / (1/2 * 9.8 m/s^2))

time = sqrt(20.4)

time = 4.47 seconds

Now that we have the time it takes for the bomb to fall, we can use the formula for the distance traveled at a constant velocity to find the horizontal distance of the bomber from the target when the bomb is released:

Distance = 50m/s * 4.47s

Distance = 223.5 meters

Therefore, the horizontal distance of the bomber from the target when the bomb is released is 223.5 meters.

Explanation:

hmmm all of u stay safe

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Pas 1234

The chemical reactivity of an atom is determined by the number of electrons present in its outermost shell, also known as the valence electrons.

These electrons play a key role in determining the chemical properties of an atom, such as its reactivity and bonding behavior. An atom with a full or nearly full valence shell is less likely to engage in chemical reactions, while an atom with a partially filled valence shell is more reactive and readily participates in chemical reactions. Thus, the number of electrons in the valence shell is a critical factor in determining the chemical reactivity of an atom. Chemical reactivity refers to the ability of a substance to participate in chemical reactions and form new compounds. It is determined by various factors, including the arrangement of electrons in the outermost shell (valence electrons), the stability of the electronic configuration, and the energy required to break or form chemical bonds.

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Faith, respect, and effective communication are the three tips to start a healthy dating relationship mentioned in the article.

What are three recommendations for beginning a happy relationship?

Trust, respect, effective communication, adaptability, a common interest, time apart, different connections (with family and friends), and appreciation. Each partner needs to have confidence in the other. Never should your partner belittle you, test you, or say anything disparaging about you.

What are good relationships?

Healthy relationships involve open communication, honesty, trust, and respect between partners as well as work and compromise from both parties. There is no imbalance of power. Partners are free to make decisions together, respect each other's independence, and take individual actions without worrying about the consequences.

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Planets may be forming from dust disks because these disks are filled with completely empty lanes.

We can arrive at this answer because:

Escape accretions allow for the formation of planetary embryos, which may form planets in the future.

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Answer:

The new kinetic energy is 9 times of the initial kinetic energy.

Explanation:

The kinetic energy of an object is given by the formula as follows :

\(E=\dfrac{1}{2}mv^2\)

Where

m is mass and v is speed of the body

If the speed of the body is tripled. Let v' is the new speed, v' = 3v. The new kinetic energy is E' and it is given by :

\(E'=\dfrac{1}{2}mv'^2\\\\\text{Put v' = 3v}\\\\E'=\dfrac{1}{2}m\times (3v)^2\\\\=\dfrac{1}{2}m\times 9v^2\\\\=9\times (\dfrac{1}{2}mv^2)\\\\E'=9\times E\)

Hence, the new kinetic energy is 9 times of the initial kinetic energy.

Answer:

The relative density of mercury is 13.6, this means that mercury is 13.6 times as heavy as an equal volume of water.

The action being performed in the photograph has to do with checking tire pressure with an electronic gauge. Option B.

Checking tire pressure is important for maintaining the safety and performance of your vehicle. There are two common ways to check tire pressure:

A manual gauge requires inserting a probe into the tire valve stem and reading the pressure from a dial. An electronic gauge uses a digital display to show the pressure as shown in the photograph.

Both methods are effective, but it is important to ensure that the gauge is accurate and properly calibrated to get an accurate reading.

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Answer:

B. 122N

Explanation:

f = 0.15 x 83 x 9.8 = 122.01

f = 122N

Answer:

No distance is the length between two routes

Explanation:

Distance is the length of the route between two points. ... Direction is just as important as distance in describing motion. A vector is a quantity that has both size and direction. It can be used to represent the distance and direction of motion.

Physical properties are used to identify and describe matter. They include

The frequency and period of the hummingbird's wing flutter are 80 Hz and 0.0125 s respectively.

It can be defined as the number of flutter per second. The period is the time taken to complete a flutter.

Given here,

Hummingbirds can flutter wings 4800 times /minute.

The frequency of the wing flutter,

\(f = \dfrac {4800}{60}\\\\ f = 80 \rm \ Hz \ (times/s)\)

Period of the wing flutter,

\(P = \dfrac 1f\)

Now put the value in the formula,

\(P = \dfrac 1{80}\\\\ P = 0.0125\rm\ s\)

Therefore, the frequency and period of the hummingbird's wing flutter are 80 Hz and 0.0125 s respectively.

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Answer:

A hummingbird can flutter its wings 4,800 times per minute.

What is the frequency of wing flutters per second?

80

flutters/second

What is the period for one wing flutter in seconds? Round your answer to two significant figures.

 0.013  seconds

Explanation:

Answer:

D. All of the above

Explanation:

Because it's the most logical answer.

In 1820, Hans Christian Orsted discovered the relationship between electricity and magnetism, which is now known as electromagnetism.

The minimum initial kinetic energy required for the mass to pivot 270° to the vertical position is 2mgr.

The minimum initial kinetic energy required for the mass to pivot 270° to the vertical position can be found using conservation of energy. Initially, the mass has gravitational potential energy equal to mgh where h is the initial height of the mass above the pivot. The mass also has initial kinetic energy equal to (1/2)mv₀².

At the vertical position, all of the initial kinetic energy has been converted to gravitational potential energy. Thus, we can equate the two energies to find the minimum initial kinetic energy required:

(1/2)mv₀² = mgh

We can solve for v₀:

v₀ = √(2gh)

Now, to pivot 270°, the mass must reach a height of 2r. Thus, we can set h = 2r and solve for the minimum initial kinetic energy:

(1/2)mv₀² = mg(2r)

(1/2)m(2gh) = mg(2r)

v₀ = √(4gr)

K = (1/2)mv₀²

  = (1/2)m(4gr)

  = 2mgr

As a result, the mass's minimal initial kinetic energy required to pivot 270° to the vertical position is 2mgr.

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Answer:

a=-5.3m/s2

Explanation:

F=-20N

m=3.75kg

a=?

F=am /:m

a=F/m

a=-20N/3.75kg

a=-5.3m/s2

Answer:

A Venus Fly trap

Explanation:

Insectivorous plants like pitcher plant and venus fly trap snack on flies or insects.

Therefore, insectivorous plants like pitcher plant and venus fly trap snack on flies or insects.

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The net work done on the coffee mug is 0.00618 J.

The given parameters;

The net work done on the mug is calculated as follows;

\(W = (F- F_f)d\\\\W = (F \ - \mu F_n)d\\\\W = (F - \mu mg)d\\\\W = (0.1 \ - \ 0.05 \times 0.12 \times 9.8)\times 0.15\\\\W = 0.00618 \ J\)

Thus, the net work done on the coffee mug is 0.00618 J.

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Answer:

The acceleration time graph is the graph that is used to determine the change in velocity in the given interval of the time. ... The acceleration time graph is used to find the change in the velocity of the moving object for the given period of time and this can be determined by finding the area under the curve

Explanation: