A ball attached to a string is whirled at a constant speed of 2.0 meters per second in a horizontal circle and has a radius of 0.50 meters. What is the magnitude of the ball's centripetal acceleration, in m/s2?

Answer:

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Explanation:

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One of the - NOT a requirement of a scientific observation is "must use a telescope".

An observation is the activity of collecting information or data about a natural phenomenon or event, which can be seen, heard, smelled, touched, or otherwise sensed by an observer. It is a basic step in scientific inquiry and is commonly used in many areas of research.

Observation is the initial step in the scientific method and, as a result, is an essential part of the scientific process. Scientists use observations to accumulate data, which is subsequently analyzed to obtain general patterns and principles, resulting in the development of theories and hypotheses.

Observations that are accurate and precise are crucial for producing reliable data.

The following are the requirements of a scientific observation:

Objective, not subjective ,Quantitative, not qualitative, Reproducible ,Must be accurate and precise.

So, among all the given options, "must use a telescope" is NOT a requirement of a scientific observation.

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Answer:

The velocity of the ball before it hits the ground is 381.2 m/s

Explanation:

Given;

time taken to reach the ground, t = 38.9 s

The height of fall is given by;

h = ¹/₂gt²

h = ¹/₂(9.8)(38.9)²

h = 7414.73 m

The velocity of the ball before it hits the ground is given as;

v² = u² + 2gh

where;

u is the initial velocity of the on the root = 0

v is the final velocity of the ball before it hits the ground

v² = 2gh

v = √2gh

v = √(2 x 9.8 x 7414.73 )

v = 381.2 m/s

Therefore, the velocity of the ball before it hits the ground is 381.2 m/s

A disk and a hoop of the same mass and radius are released at the same time at the top of an inclined plane. If both are uniform, the one that reaches the bottom of the incline first if there is no slipping is the hoop.

A hoop is a type of toy that is in the shape of a circle, it is usually made of metal or plastic and is often used by children to play games. A hoop is a uniform body that has a radius r and mass m. The moment of inertia of a hoop is given by I=mr2. The kinetic energy of a rolling hoop is given by K=12mv2+(1/2)Iω2.

Therefore, for a rolling hoop, the energy is shared between the kinetic energy of the center of mass and the rotational energy. The net force acting on the hoop as it rolls down the inclined plane is F=mgSinθ−(1/2)ma.

The acceleration of the hoop is given by a=(2/3)(gSinθ).

The acceleration of the disk is given by a=(1/2)(gSinθ).

Thus, the hoop will reach the bottom of the incline faster than the disk.

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Answer:

The mass can be calculated by dividing the net force acting on an object by the acceleration of the object. When talking about net force, we use the units kilogram meter per second squared. This is also known as a Newton. The units for acceleration is meters per seconds squared, and the units for mass are kilograms.

Answer:

\(vd=m\) - volume times density

Explanation:

d = density

v = volume

m = mass

density = mass divided by volume.

multiply both sides by volume to find mass.

(a) The power required for the car to climb the hill at steady speed is 15,555.56 W.

(b) The power required for the car to climb the hill at a changing speed is  19,444.44 W.

The power required for the car the move the incline is calculated as follows;

When the speed is steady, the average speed is calculated as;

v = ( 80km/h + 80 km/h) / 2 = 80 km/h = 22.22 m/s

P = Fv

where;

P = ( 700 N x 22.22 m/s )

P = 15,555.56 W

When the speed changes from 90 km/h to 110 km/h, the average speed is calculated as;

v = ( 90 km/h + 110 km/h ) / 2 = 100 km/h = 27.78 m/s

P = ( 700 N x 27,78 m/s )

P = 19,444.44 W

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Given

The electric flux is

Radius of the sphere,

To find

a. The flux through a gaussian sphere with radius of 29.0 cm.

b. The magnitude of the charge

Explanation

a. Since the gaussian sphere covers the same charge so the electric flux through both the sphere will be same.

Thus the required flux is

b.

The magnitude of the charge is

Conclusion

a. The flux is

b. The charge is

Explanation:

hopefully that makes sense. the position doesn't change over the 5 seconds, meaning it's stopped but time still continues. then when the slope is negative this shows the bear's position becoming negative (backing up, changing direction).

Answer:

If in an area, the magnetic flux will change then the emf (Electromotive force) induced in the wire will induce current flow in it.

If we moved the magnet inside coil of wire then its change in flux is more compared to the outside moving magnet then the induced current is more in the magnet that moves inside coil of wire

Explanation:

A zero error occurs when the balance reading is not accurate, and the pointer on the balance scale does not rest on the zero mark when there is nothing on the pan. This could happen due to several reasons, such as a misaligned pointer or an uneven surface.

What is zero error?

Zero error is a term used to describe a type of error that can occur when using a measuring instrument, such as a balance, a ruler, or a thermometer. Specifically, zero error refers to a situation where the instrument, when it should read zero, actually reads a value other than zero.

For example, if a balance is improperly calibrated, its pointer or digital display might not show zero when there is nothing on the pan. Instead, it might show a small positive or negative value, even though there is no weight present. This error is called zero error.

Zero error can occur due to several factors, such as mechanical wear and tear, temperature changes, or incorrect calibration. It is important to correct zero error to ensure that measurements are accurate and reliable.

If readings have already been taken with a balance that has a zero error, the following steps can be taken to correct the error:

First, check the balance's instruction manual to determine the method of correction. Some balances have a button or a knob that can be used to adjust the zero position.

If the balance has a button or knob, turn it until the pointer rests exactly on the zero mark. This will correct the zero error.

If the balance does not have a button or knob, a manual correction can be made by adding or removing small weights from the balance pan until the pointer rests exactly on the zero mark.

After correcting the zero error, it is essential to recheck the balance reading with a known weight to ensure that it is now accurate.

Finally, record the correction in a logbook or other record-keeping system to ensure that it is not forgotten or overlooked in the future.

It's important to note that zero error should be corrected before taking any readings as it could lead to inaccurate measurements.

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The correct answer is: Berries and leaves are fully grown.

An adaptation is a trait that helps an organism survive in its environment. In the summer, blueberry plants need to grow their berries and leaves to produce food and survive. Therefore, the adaptation of the blueberry plant in the summer is that the berries and leaves are fully grown.

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Answer: Depends on their adaptions such as they may be able to change their color of their skin to camouflage to hide from predators or they are able to survive in harsh weather where they live in.

Explanation:

Answer: An adaptation is a very particular skill which helps an animal do the things they do in every day life .  Adaptation basically helps an animal survive in the environment they have decided to live in .

Hoped I helped -

Sleepy~

Answer: Exothermic

Explanation:

An exothermic reaction causes an increase in temperature. This is because the energy released when the bonds are broken among the reactants is greater than than the energy absorbed when new bonds are formed among the products. This leftover energy gets passed along to the surroundings, where it produces a measurable increase in heat.

Answer:

Hi I'm happy to meet you and the answer for your question is true. If you need me to state the law ask me

Answer: Friction

Explanation:

Friction and the normal force would be the two initial forces to overcome.

Answer: Friction

Explanation: The object must be pushed along which will create friction which nmust be overcome.

Bulbs 2 and 3 will go out, but bulb 1 will remain lit

A parallel connection is a type of electrical connection in which multiple components or devices are connected side by side across the same two points of a circuit, such as two terminals of a battery or power source. In a parallel connection, each component has its own path to the power source, which means that the voltage across each component is the same.

In a parallel connection, the overall resistance of the circuit decreases as more components are added, which means that the total current drawn from the power source increases.

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Gyroscope is a wheel or a disc in which the axis of rotation can assume any orientation by itself. The rotation of gyroscope is obbserved about the x, y and z-axis. This rotation of gyroscope helps to measure the angular velocity.

The motion of the gyroscope is not rapid about the two or more axes.

Thus, the given statement is false.

(a) It can be stated that the 10-gram marble hits the ground first because it has a higher acceleration and travels faster.

(b) Both marbles will travel the same distance since their horizontal components of velocity and initial velocity with respect to the ground are the same.

According to the given statement, a 10-gram marble has a speed that is 5 times faster than that of a 100-gram marble. Both marbles roll off the table at the same time. The questions to answer are as follows:

(a) The acceleration due to gravity is constant at 9.8 m/s², according to Newton's Law of Gravitation.

According to the law of physics, heavier objects fall faster than lighter ones, but since the 10-gram marble has a speed that is five times faster than the 100-gram marble, it implies that the 10-gram marble covers more ground in less time than the 100-gram marble as acceleration is directly proportional to the force applied.

The time taken by both marbles to reach the ground is given byt = √(2h/g)where h is the height from which the marbles were dropped, and g is the acceleration due to gravity.

The height from which the marbles were dropped is the same in both cases, so it can be stated that the 10-gram marble hits the ground first because it has a higher acceleration and travels faster.

(b) The range traveled by both marbles is determined by the horizontal component of their velocity. It's worth noting that the horizontal components of their velocities are identical since they were launched from the same height, so there's no advantage for either marble.

The range of a projectile is determined by the formula:

R = u²sin(2θ)/g where R is the range, u is the velocity of the object, θ is the angle of the initial velocity with the horizontal, and g is the acceleration due to gravity.

Since the angle of the initial velocity with the horizontal is the same for both marbles, and their initial velocity is also the same, it can be stated that both marbles travel the same distance.

Therefore, both marbles will travel the same distance since their horizontal components of velocity and initial velocity with respect to the ground are the same.

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a) Nebular hypothesis.

The nebular hypothesis explains how our solar system probably formed from a giant cloud of gases and dispersed solid particles. According to this hypothesis, the Solar System originated from a rotating cloud of gas and dust known as a nebula. As the nebula contracted under its own gravity, it began to spin faster and flatten into a disk shape. The central region of the disk eventually formed the Sun, while the surrounding material coalesced to form planets, moons, asteroids, and comets.

This hypothesis provides a comprehensive explanation for the observed characteristics of the Solar System, such as the orbital paths and compositions of the planets. It is supported by evidence from astronomical observations, computer simulations, and the study of meteorites and comets. The nebular hypothesis is widely accepted by the scientific community as the most plausible explanation for the formation of our solar system.

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The wavelength of the 1.0-MeV gamma-ray photon is much smaller than the wavelength of the neutron having the same kinetic energy at 1.99 x 10⁻¹⁹ m and 1.79 x 10⁻¹⁵ m respectively.

The de Broglie wavelength λ of a particle can be given by the expression:

λ = h/p

where h = Planck's constant and p = momentum of the particle.

For a photon, the momentum can be given by:

p = E/c

where E = energy of the photon and c = speed of light.

For a gamma-ray photon with energy E = 1.0 MeV = 1.0 x 10^6 eV:

p = E/c = (1.0 x 10⁶ eV) / (3.0 x 10⁸ m/s) = 3.33 x 10⁻¹⁵ kg m/s

Substituting this momentum value in the expression for λ:

λ = h/p = (6.63 x 10⁻³⁴ J s) / (3.33 x 10⁻¹⁵ kg m/s) = 1.99 x 10⁻¹⁹ m

For a neutron, the momentum can be given by:

p = √(2mK)

where m = mass of the neutron, K = kinetic energy, and c = speed of light.

Substituting the given values:

p = √(2 x 939 MeV x (1.0 MeV / 938.3 MeV)) / c

p = 3.70 x 10⁻¹⁹ kg m/s

Substituting this momentum value in the expression for λ:

λ = h/p = (6.63 x 10⁻³⁴ J s) / (3.70 x 10⁻¹⁹ kg m/s) = 1.79 x 10⁻¹⁵ m

Therefore, the wavelength of the 1.0-MeV gamma-ray photon is much smaller than the wavelength of the neutron having the same kinetic energy. The gamma-ray photon has a wavelength of approximately 1.99 x 10⁻¹⁹ m, while the neutron has a wavelength of approximately 1.79 x 10⁻¹⁵ m.

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Answer:

The correct answer is - containers 1 and 3.

Explanation:

In any experiment or investigation, there must be all the factors should be constant other than the variable that is changed to see the effect on the result or desired character.

In this experiment to check the effect of the temperature, there must be the only temperature is a variable that should be manipulated rest should remain constant. In container 1st and 3rd, all the variable amount of sugar, the method of mixing all are the same except temperature.

Thus, the correct answer is - 1 and 3rd.

The elastic potential energy stored is 0.9375 J.

The elastic potential energy stored in a spring can be calculated using the following formula:

Elastic potential energy = 0.5 × k × x²

where:

k is the spring constant

x is the distance the spring is compressed or stretched

In this case, the spring constant is given as 12.5 N/mm and the compression is 0.15 mm. Plugging these values into the formula, we get the following:

Elastic potential energy = 0.5 × 12.5 N/mm × (0.15 mm)²

= 0.9375 J

Therefore, the elastic potential energy stored is 0.9375 J.

The elastic potential energy stored in the abductin pad is used to open the shell when the muscles relax. The muscles close the shell by contracting, which compresses the pad. When the muscles relax, the pad expands, pushing the shell open. The energy to do this comes from the elastic potential energy that was stored in the pad when it was compressed.

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Answer:

D. 20 N

Explanation:

Force = mass(m) × acceleration due to gravity (g)

Force = 2kg × 10m/s²

Force = 20N

Answer:

b

Explanation:

Answer:

Letter C. type in "human immune system" HIV effects

Explanation:

because she was focusing on the immune system and the effects of HIV in the human body system project

Answer:

its d

Explanation:

The transmitted light travels at an angle of 42.6° below the horizontal.

When light travels through a medium, it can change direction. This change in direction is known as refraction. The amount of refraction that occurs depends on the angle of incidence and the refractive index of the medium.

In this case, the light is traveling from air (where it is traveling straight) to a medium with a higher refractive index (the water). The angle of incidence is 60°, which means that the angle of refraction can be calculated using Snell's law:

n1 sin θ1 = n2 sin θ2

where n1 is the refractive index of air (approximately 1), θ1 is the angle of incidence, n2 is the refractive index of water (approximately 1.33), and θ2 is the angle of refraction.

Plugging in the numbers, we get:

1 sin 60° = 1.33 sin θ2

Rearranging the equation and solving for θ2, we get:

θ2 = sin⁻¹(1/1.33 * sin 60°) ≈ 42.6°

Therefore, the transmitted light travels at an angle of 42.6° below the horizontal.

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Explanation:

the speed of the motor can be increased by increasing the strength magnetic field increasing the current flowing through the coil.

Using the formula 1/f = 1/di + 1/do, where f is the focal length of the lens, di is the distance of the image from the lens, and do is the distance of the object from the lens:
1/40 = 1/di + 1/100

Solving for di:
1/di = 1/40 - 1/100
1/di = (5 - 2)/200
1/di = 3/200
di = 200/3
di = 66.7 cm
Therefore, the image will be located 66.7 cm from the lens.
To find the image location, we can use the lens formula:
1/f = 1/do + 1/di
Here, f = focal length (40 cm), do = object distance (100 cm), and di = image distance (which we need to find).
1/40 = 1/100 + 1/di
Now, solve for di:
1/di = 1/40 - 1/100 = (5-2)/200 = 3/200
di = 200/3 ≈ 66.67 cm
So, the image will be located approximately 66.67 cm from the lens.

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Answer:

answer is add 3 to both sides