7. You probably had difficulty in measuring the period, yet its calculation should prove effortless at this point. Why do you suspect there is difficulty in the measurement

The diagram below that shows a free-body diagram is the third option m

A free-body diagram shows all the forces acting on a single object. In this case, the object is m3. The forces acting on m3 are:

The force F1 exerted by m1. This force is directed to the left. The force F2 exerted by m2. This force is directed to the right.

The force F3 exerted by m3. This force is directed to the left.

The net force on m3 is zero, since the forces F1 and F2 are equal and opposite. This means that m3 is in equilibrium.

Diagram (a) shows the forces F1 and F2, but it does not show the force F3. This is incorrect, since F3 is also acting on m3. In conclusion,the correct option is C.

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If the human were fully made of neutron star matter, his mass would be roughly 1.8 x 10¹⁶ kg, to two significant numbers.

As most protons and electrons will have merged to become neutrons under the extremely dense conditions, neutron stars get their name because they are largely made of neutrons.

Assume the individual has a volume of 59,000 cm3, or about the same as someone with a density of 1000 kg/m3. When we convert this volume to m3, we obtain:

V = 59,000 cm³

V = 0.059 m³

If the individual were made entirely of matter from neutron stars, his mass would be:

m = ρV

m = (3 x 10¹⁷ kg/m³) (0.059 m³)

m = 1.77 x 10¹⁶ kg

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Answer:1.9 atm

Explanation: I stole it from someone O-O

So it could be wrong

Answer:2m/s^2

Explanation:

a=f/m

❖ Your marble has a mass of 5.0g. What is its mass in kilograms? (Remember to include your units. Given: 1kg=1000g)

— — — — — — — — — —

— To calculate the mass in grams into kilograms, we just need to divide the given mass in grams by 1000 (since 1kg is equivalent to 1000 g).

_______________∞_______________

Answer:

I believe the answer is 5718.75. Respond if it is wrong please.

Explanation:

I used a calculator.

Answer:

B 2m\s

Explanation:

18 m of displacement over the course of 9 seconds

18/9 = 2 m\s

These waves are traveling at the same speed.  The wave with the highest frequency is option C, "A wave frequency with line crossing in the middle."

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Long straight distance that a person can swim is 5.64 m.

The line that runs form one end of the circle to another is called the diameter of the circle. The pool is a circle according to the question and the long straight distance that a person can swim is the same of the diameter of the circular pool.

Now we have;

A =  πr^2

A = area of pool

r  = radius of pool

r = √A/ π

r = √25/3.142

r = 2.82m

Diameter of the circular pool = 2 r = 2 (2.82 cm) = 5.64 m

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Missing parts;

An ad for an above-ground pool states that it is 25 m2. From the ad, you can tell that the pool is a circle. If you swim from one point at the edge of the pool to another, along a straight line, what is the longest distance d you can swim? Express your answer in three significant figures.

The letter that represents the various descriptions is as follows:

5.) Angle of incidence: B

6.) Object: D

7.) Plain mirror:A

8.) Reflection: E

9.) Angle of reflection: C

10.) Normal: F

The law of reflection in a plain mirror states that the angle of reflection is equal to the angle of incidence.

The diagram explains the law of reflection on a plain mirror because it shows the reflection of the object D as E after creating an angle of incidence B on the plane mirror surface A which is equal to the angle of reflection C.

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( a) The acceleration of the box in the absence of friction is 8.49 m/s².

(b) The acceleration of the box in the presence of friction is 1.7 m/s².

(c) The speed of the box at the bottom of the incline is 18.44 m/s.

The acceleration of the box if no friction is present is calculated by applying Newton's second law of motion.

mg cosθ = ma

g cosθ = a

where;

The acceleration of the box in the absence of friction is calculated as;

a = ( 9.8 ) x ( cos 30 )

a = 8.49 m/s²

The acceleration of the box in the presence of friction is calculated as;

Ff = ma

where;

μmg cosθ = ma

μg cosθ = a

( 0.2 x 9.8 x cos 30 ) = a

1.7 m/s² = a

The speed of the box at the bottom of the incline is calculated as follows;

v² = u² + 2ah

where;

v² = 0 + 2ah

v = √ ( 2ah )

h = L sinθ

v = √ ( 2 x a x L sinθ )

v = √ ( 2 x 1.7 x 200 x sin 30 )

v = 18.44 m/s

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1. The potential energy of the pomegranate is 282.24 J

2. The potential energy of the melon is 250.88 J

3. The pomegranate has more potential energy

This is the energy possesed by an object by virtue of it's position. It is expressed mathematically as

Potential energy (PE) = mass (m) × acceleration due to gravity (g) × height (h)

PE = mgh

With above formula, we can determine the potential energy as follow:

1. How to determine the potential energy of the pomegranate

PE = mgh

PE = 0.3 × 9.8 × 96

PE = 282.24 J

2. How to determine the potential energy of the melon

PE = mgh

PE = 0.8 × 9.8 × 32

PE = 250.88 J

From the calculations made above, the pomegranate has more potential energy.

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In a DC generator, the generated electromotive force (emf) is directly proportional to the rotational speed of the generator's armature and the strength of the magnetic field within the generator.

This relationship is described by the equation for the generated emf in a DC generator:

Emf = Φ * N * A * Z / 60

Where:

Emf is the generated electromotive force (in volts),

Φ is the magnetic flux density (in Weber/meter^2\(meter^2\) or Tesla),

N is the number of turns in the armature winding,

A is the effective area of the armature coil (in square meters),

Z is the total number of armature conductors, and

60 is a constant representing the conversion from seconds to minutes.

From this equation, we can see that the generated emf is directly proportional to the magnetic flux density (Φ) and the product of the number of turns (N), effective area (A), and the total number of armature conductors (Z). This means that increasing any of these factors will result in a higher generated emf.

The magnetic flux density (Φ) can be increased by using stronger permanent magnets or increasing the strength of the field windings in the generator.

The number of turns (N) and the effective area (A) are design parameters and can be optimized for a specific generator. Increasing the number of turns or the effective area will result in a higher generated emf.

Similarly, the total number of armature conductors (Z) can be increased to enhance the generated emf.

By controlling and optimizing these factors, the generated emf in a DC generator can be increased, resulting in higher electrical output. However, it is important to note that there are practical limits to these factors based on the design and construction of the generator.

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The new gravitational force between the two planets, when they are moved to two million miles apart, is 250,000 N

The gravitational force between two objects can be calculated using Newton's Law of Universal Gravitation, which states that the force is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Given:

Initial distance between the planets = 1 million miles

Initial gravitational force = 1,000,000 N

Final distance between the planets = 2 million miles

To determine the new gravitational force, we need to compare the ratios of the distances and apply the inverse square law.

Let's denote the initial distance as d1, the initial gravitational force as F1, the final distance as d2, and the unknown final gravitational force as F2.

According to the inverse square law, the ratio of the gravitational forces is the square of the ratio of the distances:

(F2/F1) = (d1/d2)²

Substituting the given values:

(F2/1,000,000 N) = (1 million miles / 2 million miles)²

Simplifying:

(F2/1,000,000 N) = (1/2)²

(F2/1,000,000 N) = 1/4

F2 = (1/4) * 1,000,000 N

F2 = 250,000 N

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Explanation:

a boy walks at 2m/s for 30sec and run at 5m/s for 20sec. what is his average speed

Answer:

The geocentric model says that the earth is at the center of the cosmos or universe, and the planets, the sun and the moon, and the stars circles around it. The early heliocentric models consider the sun as the center, and the planets revolve around the sun.

Answer:

Explanation:

We can use the conservation of energy to determine at what height the kinetic energy (KE) and potential energy (PE) of the object are equal. At any given point during the fall, the total mechanical energy of the object is equal to the sum of its kinetic energy and potential energy, and it remains constant throughout the fall.

Initially, when the object is dropped from a height of 23 m, it only has potential energy. At this point, the potential energy of the object is given by:

PE = mgh

where m is the mass of the object, g is the acceleration due to gravity (9.81 m/s^2), and h is the height of the object above some reference point. Plugging in the given values, we get:

PE = mgh = m × 9.81 m/s^2 × 23 m

Next, we need to determine the kinetic energy of the object when its potential energy is equal to the potential energy at some height h. At this point, the object has fallen a distance of (23 - h) meters, and its potential energy has been converted into kinetic energy. Therefore, we can write:

KE = 1/2 mv^2 = PE = mgh

where v is the velocity of the object at height h. Solving for v, we get:

v = sqrt(2gh)

Now we can calculate the kinetic energy of the object at height h:

KE = 1/2 mv^2 = 1/2 m (sqrt(2gh))^2 = mgh

We can see that the kinetic energy is equal to the potential energy at height h. So we can set the two equations for PE and KE equal to each other and solve for h:

mgh = 1/2 m (sqrt(2gh))^2

Simplifying this equation, we get:

h = 1/2 (sqrt(2gh))^2 / g

h = 1/2 (2gh) / g

h = h

Therefore, the height at which the kinetic energy and potential energy of the object are equal is h = 23 / 2 = 11.5 meters.

Option C. The heat absorbed or lost by a substance while it's changing state  correctly describes latent heat

Latent heat is the heat absorbed or lost by a substance while it is changing state.

The latent heat is a type of heat that is transferred during phase change, i.e., while a substance undergoes a change of state.

For example, when ice melts into liquid water, or when liquid water evaporates into water vapor, heat is absorbed from the surroundings.

Latent heat is not associated with a temperature change; rather, it's associated with a change of state.

For instance, the temperature of water remains at 100°C while boiling.

When water is boiling, the latent heat of vaporization is absorbed and utilized to break the hydrogen bonds holding water molecules together to change water from the liquid phase to the gaseous phase.

When the water is boiling, adding more heat won't increase the water's temperature, instead, the extra heat will be absorbed to change the phase of water molecules.

Therefore, the correct answer to the given question is option C: The heat absorbed or lost by a substance while it is changing state.

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The cell can maintain an electric potential difference across the two ends of the external circuit by supplying energy to the charge.

The movement of a positive test charge from the negative terminal to the positive terminal within the cells requires work to be done on it.

As a result of this motion, the potential energy and electric potential of the charge would both increase.

The positive test charge loses some of its electric potential energy as it passes through the external circuit from the positive terminal to the negative terminal, and by the time it gets back to the negative terminal, it is at a low potential.

The energy required for work on the charge to transport it from the negative to the positive terminal is provided by the cells.

The cell can maintain an electric potential difference across the two ends of the external circuit by supplying energy to the charge.

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Answer:

They are isotopes of each other

Explanation:

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

For atom A and atom B, their number of protons is the same (10)

But their number of neutrons is different (12) and (10)

Answer:

0 Newtons, to the nearest whole number

Explanation:

Using the formula attached to this answer,

F = (6.67 x 10-¹¹ • 95 • 82) / 0.6²

F = 5.19593 x 10-⁷ / 0.36

F = 1.4433 x 10-⁶ N

F = 0.000001443 N

To the nearest whole number

F = 0 N

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Answer:

The graph of the velocity of an object in free fall would look like a straight line sloping downward. As the object falls, its velocity increases at a constant rate, so the graph of its velocity versus time will be a straight line with a negative slope. This is because acceleration due to gravity is a constant -9.8 meters per second squared, so the velocity of a free-falling object will increase by 9.8 meters per second every second.

Therefore, the graph that shows the change in velocity of an object in free fall is a straight line with a negative slope. Here is an example of such a graph:

Free Fall Velocity Graph

Answer:

False

Explanation:

Answer:

C

Explanation:

 Phobias are a common thing among people for different reasons, people may be triggered by them for different reasons and have a state of shock or something related to that matter. When you may interact with that type of phobia you may have, you will have a type of reaction. However, it depends quite on your personality. Phobias also mean a fear of something.

The initial volume of the liquid is 31.4 cm³. The volume coefficient of thermal expansion of the liquid is 0.002 per degree Celsius. A temperature increase of 109.5°C is needed for the liquid to rise to a height of 49cm.

The initial volume of the liquid can be found using the formula for the volume of a cylinder:

V = πr²h

where r is the radius (half the diameter), h is the height, and π is approximately 3.14. Plugging in the given values, we get:

V = π(0.5 cm)²(40 cm)

V = 31.4 cm³

The volume coefficient of thermal expansion (β) is defined as the fractional change in volume per degree Celsius change in temperature. It can be calculated using the formula:

β = ΔV/(VΔT)

where ΔV is the change in volume, V is the initial volume, and ΔT is the change in temperature. We can rearrange this formula to solve for ΔV:

ΔV = βVΔT

We know that ΔT = -10°C (a decrease of 10°C) and that the height decreased from 40cm to 37cm, or by 3cm. The change in volume can be found using the formula for the volume of a cylinder again, with the new height of 37cm:

ΔV = π(0.5 cm)²(40 cm - 37 cm)

ΔV = 0.59 cm³

Plugging in all the values, we get:

0.59 cm³ = β(31.4 cm³)(-10°C)

β = 0.002

To find the change in temperature needed for the liquid to rise to a height of 49cm, we can use the same formula as before, but solve for ΔT:

ΔT = ΔV/(βV)

We know that ΔV is the difference between the initial volume and the volume at the new height, which is:

ΔV = π(0.5 cm)²(49 cm - 40 cm)

ΔV = 6.86 cm³

Plugging in all the values, we get:

ΔT = 6.86 cm³/(0.002)(31.4 cm³)

ΔT = 109.5°C

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The maximum displacement = 0.0189 m

The Total energy of the system = 1.188 J

The Gravitational potential energy = 0.22 J

Let m be = Mass of the object = 1.2 kg

As given K = Spring Constant of the spring = 300 N/m

Let v denote = Maximum speed with which the body oscillates = 30 cm/s

Let 'x' be the maximum displacement of the body

x²= mv²/k=1.2* 0.3 /300= 0.0189

Total energy= kinteric energy+potential energy =kx²/2 + mv²/2

=1.188J

The Gravitational potential energy of the system is

E=Mgx=1.2*9.8*0.0189

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The 1.2 kg object's maximum displacement when it is suspended from a spring with a 300 N/m force constant oscillates at a maximum speed of 30 cm/s. This displacement is equal to 0.0189 m.

When the object is displaced to its maximum, the system's total energy is 1.188 J.

The energy of gravity is equal to 0.22 J.

Allow m to be equal to 1.2 kg, the object's mass.

K = Spring as stated. Springs have a constant of 300 N/m.

the body can oscillate at a maximum speed of 30 cm/s (let v signify this).

Suppose that "x" represents the body's largest displacement.

x²= mv²/k=1.2* 0.3 /300= 0.0189

Total energy = interstellar energy + potential energy = kx2/2 + mv2/2

=1.188J

According to the system's gravitational potential energy,

E=Mgx=1.2*9.8*0.0189

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The candidate's speed (m/s), given that the candidate experiences a centripetal acceleration that is 2.8 times the acceleration due to gravity is 17.4 m/s

We understood that the centripetal acceleration is related to speed and radius according to the following formula:

a = v² / r

Cross multiply

v² = ar

Take the square root of both sides

v = √ar

Where

Withe the above formula, we can determin the speed of the candidate. Details below:

v = √ar

v = √(27.44 × 11.05)

v = 17.4 m/s

Thus, the speed of the candidate is 17.4 m/s

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The car is moving at approximately 12.5 meters per second.

The kinetic energy (KE) of an object can be calculated using the formula:

KE = 1/2 * m * \(v^2\)

where

KE = kinetic energy,

m =Mass of the object, and

v = velocity.

In this case, we are given the mass (m) of the car as 1600 kg and the kinetic energy (KE) as 125,000 J. To find the velocity .

Substituting the  values , we have:

125,000 J = 1/2 * 1600 kg *\(v^2\)

Now, we can solve for v by rearranging the equation:

\(v^2\) = (2 * 125,000 J) / 1600 kg

\(v^2\) = 156.25 \(m^2/s^2\)

Taking the square root, we find:

v = √156.25\(m^2/s^2\)

v ≈ 12.5 m/s

Therefore, the car is moving at approximately 12.5 meters per second.

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Answer:

200000000000000000000000

Explanation:

Answer:

10000000000000000100

Explanation: