Whait is harmonics of recuency?

The students can improve their confidence in the experiment's results by dropping each object 10 times and using the average of each object's fall times.

The correct option is A.

An experiment is a technique used to confirm or deny a hypothesis, as well as assess the likelihood or effectiveness of something that has never been tried before.

Experiments show what happens when a specific factor is modified, which sheds light on cause-and-effect relationships.

By taking repeated measurements in an experiment the accuracy and confidence of the experiment's results can be improved.

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Answer:

(Question)  Melissa is working on the roof of her house. She drops a hammer and a nail. Why do both objects hit the ground at the same time?

(Answer)  Earth’s gravity causes both objects to fall at the same rate.

(Question)  Which of the following statements about gravitational mass is true?

(Answer)  Gravitational acceleration is irrespective of mass.

(Question)  Two objects fall from an apartment window sill at the same time. Object 1 lands on the sidewalk in 3.6 seconds. Object 2 lands on the sidewalk in 3.3 seconds. What can be concluded about the objects?

(Answer)  Object 1 has more surface area than Object 2.

(Question)  A company uses drones to fly food to people in regions that have experienced natural disasters. The food is packed in boxes that are attached to parachutes. How can the company change the design of its parachute to reduce the number of boxes that are damaged when they hit the ground?

(Answer)  The company can design a parachute with more surface area.

(Question)  Students want to design an experiment to study gravity. They decide they will drop four objects with the same mass from the top of their school’s bleachers. They will time how long each object takes to reach the ground. How can they improve confidence in the experiment’s results?

(Answer)  Drop each object 10 times and use the average of each object’s fall times.

Explanation:

i just finished the quick check

Examples of devices that use electromagnetic waves include the following below:

This is referred to as the type of waves that are created as a result of vibrations between an electric field and a magnetic field.

They propagate through space and carry momentum and electromagnetic radiant energy and example of devices which use this type of waves are microwaves which is used in heating food and other substances , x-rays which are used as a diagnostic tool etc.

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The ful question:

What are examples of devices that use electromagnetic waves? Check all that apply.

FM radios

microwaves

TV remote controls

alarm clocks

X-rays

Before the ball hits the ground, it is 2.8 seconds in the air. The result is obtained by using the equations in uniformly accelerated straight motion.

The equations apply in uniformly accelerated straight motion in vertical dimension are

v₁ = v₀ + gt

v₁² = v₀² + 2gh

h = v₀t + ½ gt²

Where

A student standing on the ground throws a ball straight up with

Find the time it takes for the ball to reach the ground!

We use g = 9.8 m/s². See the illustration picture in the attachment!

The ball will go upward and stop at a certain height with v₁ = 0. The time needed is

v₁ = v₀ - gt₁

0 = 13.0 - 9.8t

13.0 = 9.8t

t₁ = 13.0/9.8

t₁ = 1.3 s

The height above the hand when the ball stops is

v₁² = v₀² - 2gh₂

0 = 13.0² - 2(9.8)h₂

13.0² = 2(9.8)h₂

169 = 19.6h₂

h₂ = 8,62 m

The ball stops at a height of

h₃ = h₁ + h₂

h₃ = 2.50 + 8.62

h₃ = 11.12 m

The ball goes downward and reach the ground. Initial velocity in this condition is v₁ = 0. The time needed is

h₃ = v₁t + ½ gt₂²

11.12 = 0 + ½ (9.8)t₂²

11.12 = 4.9t²

t₂² = 2.27

t₂ ≈ 1.5 s

The time that the ball in the air is

t = t₁ + t₂

t = 1.3 + 1.5

t = 2.8 s

Hence, the ball is in the air for 2.8 seconds.

Your question is incomplete, but most probably your full question was

A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 13.0 m/s when the hand is 2.50 m above the ground. How long is the ball in the air before it hits the ground? (The student moves her hand out of the way).

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1 (a) The vertical height upto which the ball reaches will be 4.608 meters

a) We may use the theory of conservation of energy to compute the vertical height reached by the ball.

The ball's original total mechanical energy equals its ultimate potential energy.

The potential energy formula is mgh,

where m is the ball's mass,

g is the acceleration due to gravity (9.8 m/s2), and

h is the height.

The initial total mechanical energy equals the initial kinetic energy, which may be computed using the formula 1/2 * m * v2,

where v represents the beginning velocity.

By equating the two, we get:

1/2 * m * v^2 = mgh

Rearranging and solving for h:

h = v^2 / (2g)

= (9.6 m/s)^2 / (2 * 9.8 m/s^2)

= 4.608 m

b) If the ball glides up the hill without rolling, its final height will be lower than if it rolls.

As the ball slows down, part of its original kinetic energy is converted into frictional warmth, sound, and other types of internal energy.

To calculate the moment of inertia, we must first know the skater's mass distribution and the axis along which the moment of inertia is being computed.

Assuming the skater's arms are dragged inward and may be considered as cylinders with radius 0.125 m and mass m_a, the moment of inertia can be calculated as follows:

I = I_cm + m_a * r^2

where I_cm is the moment of inertia of the skater's body (assuming it can be treated as a point mass),

r is the distance from the axis of rotation to the center of mass of the cylinder (0.125 m), and

m_a is the mass of the cylinder (unknown).

To calculate I_cm, we need to know the skater's body's mass and shape. Without more information, we cannot calculate the moment of inertia.

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b) For the car to stay just in contact with loop, normal force from loop on car should be zero.

A force is an influence that can alter an object's motion in physics. A force can cause an object with mass to accelerate and change its velocity (for example, moving from a state of rest). Force can also be conceptualised as a push or a pull.

A force is a vector quantity since it has both magnitude and direction. It is calculated using newtons as the SI unit of measure (N). F stands for force (formerly P).

The net force acting on an object is equal to the rate at which its momentum changes over time, according to Newton's second law in its original form.

Balancing the forces on the car, centrifugal force = weight + normal force,

mv2/R = mg + 0

v2 = Rg

KE = 1/2*mv2 = 1/2*mRg

PE at the point = mg*(2R)

So, total energy = 1/2*mRg + mg*(2R) = 5/2*mgR

But total energy = mgH where H is inital height of fall.

Thus, mgH = 5/2*mgR

Thus, H = 5/2*R = 5/2*15 = 37.5 m

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The acceleration is g (the acceleration of gravity--- 9.8 m/s2 )

The initial velocity of the first stone is 2.4 m/s. what is the acceleration of a?

For the first stone:

The distance travelled is the initial velocity times time + distance for an acceleration from 0.

In this case, the acceleration is g (the acceleration of gravity--- 9.8 m/s2 )

So

d = vi * t  + 1/2 * g * t2  

Plug in the numbers:

50 = 2*t + 9.8/2 * t2

Put in standard format:

4.9t2  + 2t - 50 = 0

not obviously factorable, so use the quadratic formula:

t = (-2 ± √( 22 - 4*4.9*(-50)) ) / 2(4.9)

t = (-2 ± √984 ) / 9.8

t = (-2 ± 31.4) / 9.8

A negative value has no meaning so t = 29.4/9.8 = 3  (This is the (a) answer)

This is the time after the 1st throw that BOTH stones hit the water,  so the time for the second stone is 2 seconds.

Use the same equations to get the initial velocity of the 2nd stone.  (This time, you'll be entering d and t and solving for vi )

For the velocity hitting the water, use v = vi  + g*t  = vi  + 9.8t

plug in vi  and t, and solve

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The true assertions are option (a) and (c).

if the two statements are logically equivalent  then irrespective of the truth value of Q(x,y) the assertion given here always true

let Ex Ey q(x,y) is true then Ey q(x,y) is true for some x

therefor q(x.y) is true for some y

Ey Ex Q ( x,y) is true

b) for all value of x Ey Q(x,y) => Ey for all values of x Q(x,y)

let Q(x,y) = 3+y =x

for all values of Q(x,y) means for all x there is a y such that 3+y =x ( let x =8 then E 5  such that 3+5 =8 )

Ey for all values of x Q(x,y) means there is unique value of y that satisfies for all x inn the universe ie in this example for any choice of x these is

3+y=x that is not true

c) Ex for all values of y Q(x,y) => for all values of y Ex Q(x,y) it is logically true

for all values of Q( a,y) by existential instantiation

for all values of y Ex Q(x,y) by universal generalization.

d) Ex Ey Q(x,y) => for all values of y Ex Q(x,y)

Q( x,y) = y = [tex]x^2[/tex]

on the set of real numbers

Ex Ey Q(x,y) means for some real numbers x there is some real numbers satisfying y = [tex]x^2[/tex]

for all values of y Ey Q(x,y) is always there

but at the same time if y=-2, there is no real number x is satisfying [tex]x^2 = -2[/tex]

therefore, the assertion is not always true .

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There is no single speed for terminal velocity because it depends on drag and the cross section of an item.

The complete question is,

Is there a maximum terminal velocity?

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The number of revolutions is 102.655 it makes during this motion, assuming no slipping.

V= u+ at

24.8= 0 + a× 10.1

a= (24.8/10.1) m/s²

s= ut +1/2at² = at²/2

= 24.8/10.1×2 × 10.1²

=125.24m

Circumference of tire = πd. =. 3.14 × 0.389= 1.22

Total revolution= 125.24/ 1.22 = 102.655

What is acceleration?

The measurement of a change in velocity called acceleration. Acceleration typically indicates a change in speed, albeit not necessarily. An object moving in a circular path at a constant speed is still moving forward because the direction of motion is shifting. Acceleration is the rate at which an object's velocity varies in relation to time in physics. Newton's Second Law states that an object accelerates as a result of the total of all the forces acting on it. The SI system uses the meter per second squared (m s2) as the measure of acceleration.

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We can calculate the heat required to vaporize the liquid water into steam: q = m * L

q = 0.019 kg * 22.6 E5 J/kg = 4,241 J

So, the total heat required for the conversion of liquid water to steam is the sum of the two:

q = 2,958 J + 4,241 J = 7,199 J

Therefore, the heat required for the conversion of liquid water to steam is 7,199 J.

The heat required to vaporize a liquid is known as the latent heat of vaporization. It is the amount of heat energy required to change the state of a substance from a liquid to a gas or vapour, without changing its temperature.

The latent heat of vaporization is a characteristic property of a substance and is specific to each substance. The value of the latent heat of vaporization is usually expressed in units of joules per kilogram (J/kg).

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The relative magnitude of the third charge would be greater than the other two charges.

This is because the system needs to be in equilibrium, and the forces on each of the particles need to balance out. Since two of the charges are equal and the equilibrium arrangement is such that they are 90° apart, this would mean that the repulsive force that they exert on each other is greater than if they were 120° apart.

Therefore, since their repulsive forces are greater, the magnitude of the third charge needs to be greater in order to balance out the repulsive forces of the two equal charges. This is because the third charge needs to exert a greater attractive force on the two equal charges in order to offset the greater repulsive force that they exert on each other.

Thus, the relative magnitude of the third charge needs to be greater than the other two charges in order to maintain equilibrium.

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According to section k of the cantilever, when a beam or frame is subjected to transverse loadings, the three potential internal forces that can be created are the normal or axial force, the shearing force, and the bending moment.

The complete question is,

What forces are at play when a beam is used?

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According to our knowledge, the distance that an object has gone or covered after five seconds is that distance.

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When the volume is doubled and the absolute pressure is reduced by a third, the temperature of the trapped gas reaches two thirds of its initial temperature.

This is a fictitious gas whose volume it occupies is negligible, this gas does not exist in real situations and the concept of an ideal gas is only theoretical.

By using the compound gas law equation for the given problem

P1V1/T1 = P2V2/T2

P2 = P1/3

V₂ = 2V₁

By substituting the pressure and volume values into the equation

= 2/3 x T1;

Therefore, the temperature of the trapped gas reaches 2/3 of its initial temperature.

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The two resistors have a value of 7.5 Ω each.

Let the two resistors be R1 and R2.

Since the resistors are in series, the total resistance is equal to the sum of the individual resistances: R = R1 + R2

We can determine the voltage between each resistor using Ohm's law:

V = IR

For R1:

V1 = I * R1

V1 = 0.30 A * R1

For R2:

V2 = I * R2

V2 = 0.30 A * R2

Since the total voltage across the battery is 12 V, we have:

V1 + V2 = 12 V

0.30 A * R1 + 0.30 A * R2 = 12 V

Solving for R1 and R2:

R1 = (12 V) / (0.30 A) = 40 Ω

R2 = (12 V - 0.30 A * R1) / (0.30 A) = (12 V - 0.30 A * 40 Ω) / (0.30 A) = 40 Ω

For the resistors wired in parallel:

Let's call the combined resistance Rp.

The resistance in a parallel circuit can be calculated using:

1/Rp = 1/R1 + 1/R2

Using Ohm's law, we can find the voltage across the resistors:

V = IR

For R1:

V1 = I * R1

V1 = 1.6 A * R1

For R2:

V2 = I * R2

V2 = 1.6 A * R2

Since the total voltage across the battery is 12 V, we have:

V1 + V2 = 12 V

1.6 A * R1 + 1.6 A * R2 = 12 V

Solving for R1 and R2:

R1 = (12 V) / (1.6 A) = 7.5 Ω

R2 = (12 V) / (1.6 A) = 7.5 Ω

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Answer:

below

Explanation:

to condense to water at 100 degrees C  the steam gives off

5.5 kg * 2.3 x 10^6 j /kg  of heat....then the water cools to 70 degrees C

Going from 100 to 70 C   Gives off

(100 - 70) degree C   *  4182 J kg /degree C * 5.5 kg

Total heat given off = 13 340 030 J

Answer:

Explanation:

Energy released= m*c*T(water)+m*L(Steam)

energy released= 5.5*(4180*30+2300000)

energy released=13339700J

The distance that the light travels in 1.0 μs is 2.998 × 10⁸ m/s × 1.0 × 10⁻⁶ s. It is just a math expression obtained by the equation of speed.

The equation of speed can be expressed as

Speed = Distance/Time

The speed of light = 2.998 × 10⁸ m/s. If the light travels in 1.0 μs, find the distance! Just set up the math and don't do any of it!

We know that μ (read miu or micro) is equal to 10⁻⁶ s.

We can use the equation above to find the distance that the light travels in 1.0 μs.

Distance = Speed × Time

Distance = 2.998 × 10⁸ m/s × 1.0 μs

Distance = 2.998 × 10⁸ m/s × 1.0 × 10⁻⁶ s

We only need the math expression, so that's the answer.

Hence, in 1.0 μs, the light travels in a distance of 2.998 × 10⁸ m/s × 1.0 × 10⁻⁶ s.

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Coal used primarily in the united states for electricity generation.

A readily combustible sedimentary deposit made primarily of carbon, coal is called. Black or brownish-black in color, coal is composed of more than 50% carbonaceous material by weight and more than 70% carbonaceous material by volume (including inherent moisture). It is made of plant remains that have undergone geologic pressure and heat been compacted, hardened, chemically changed, and metamorphosed.

The majority of the sites where coal is found worldwide, including in the United States, are where ancient forests and marshes formerly stood before being buried and compacted over millions of years. In the eastern United States, in the Appalachian basin, there are some of the greatest coal resources. In the United States, coal produced 23% of the electricity in 2021, which was less than natural gas plants and more than renewable energy or nuclear power. 19% of total generating capacity was coal.

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A scientific theory is a term used in science to describe a concept that has been widely supported by various observations, experiments, and data.

A scientific theory is a well-substantiated explanation of some aspect of the natural world that is based on a body of facts that have been repeatedly confirmed through observation and experimentation.

Theories explain why things happen and make predictions about future observations. They are considered to be well-established and widely accepted within the scientific community, and have been thoroughly tested and supported by evidence. Examples of scientific theories include the theory of evolution, the theory of gravity, and the theory of relativity.

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You should discover that, regardless of their exact mass or diameter, a solid object will always roll down the ramp quicker than a hollow object of the same shape (sphere or cylinder).

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Answer:

1 no =5m/s

2 no=10m/s

3no=15m/s

4no=15m/s

Explanation:

The magnitude of a vector formula is used to calculate the length for a given vector (say v) and is denoted as |v|. So basically, this quantity is the length between the initial point and endpoint of the vector.

the formula to determine the magnitude of a vector (in two dimensional space) v = (x, y) is: |v| =√(x2 + y2). This formula is derived from the Pythagorean theorem. the formula to determine the magnitude of a vector (in three dimensional space) V = (x, y, z) is: |V| = √(x2 + y2 + z2)

The magnitude of a vector formula is used to calculate the length for a given vector (say v) and is denoted as |v|. So basically, this quantity is the length between the initial point and endpoint of the vector.

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Poor reading skills were once thought to be the result of inferior intelligence, according to a common belief. The reading disorder known as dyslexia.

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Answer:

30.2 Earth years for the new planet to orbit the Sun once.

Explanation:

An AU (astronomical unit) is the average distance from the Earth to the Sun, approximately 93 million miles or 150 million kilometers. So a semi-major axis of 10.5 AU is roughly equivalent to 987.5 million miles or 1.58 billion kilometers.

The time it takes for a planet to orbit the Sun is called its orbital period. The formula for calculating the orbital period of a world is:

T = 2π * √(a^3 / G(M_s)), where T is the orbital period, a is the semi-major axis, G is the gravitational constant, and M_s is the mass of the Sun.

Since the mass of the Sun is known, we can use the formula to calculate the orbital period of the new planet:

T = 2π * √(10.5^3 / (4π^2)) ≈ 30.2 Earth years

So, it will take approximately 30.2 Earth years for the new planet to orbit the Sun once.

To find the formula for the mutual repulsive Coulomb force due to like charges, you can use the following equation:

Fcoulomb = (k * q1 * q2) / r²

Where k is the Coulomb constant, q1 and q2 are the charges of the two objects, and r is the distance between them.

You can also use the equation for gravitational force,

Fgravity = G * m1 * m2 / r²,

where G is the gravitational constant, m1 and m2 are the masses of the two objects, and r is the distance between them. This will give you an equation for Fcoulomb in terms of r, L, and Fgravity.

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Answer: A. Two tennis balls that are near each other

Explanation: The gravitational force between two objects depends on their masses and the distance between them.  According to Newton's law of universal gravitation, the force of gravity is directly proportional to the product of the masses and inversely proportional to the square of the distance between the objects.

In this scenario and given the information provided, the tennis balls are near each other but not touching,  the distance between them is small. Furthermore, tennis balls have relatively low mass and are smaller compared to soccer balls.  So, the gravitational force between them will be relatively small.

Answer:

  B.  Two soccer balls that are near each other

Explanation:

You want to know the configuration of objects that has the least mutual gravitational attraction from ...

Newton's law of universal gravitation says the force due to gravity between two objects is proportional to their masses and inversely proportional to the square of the distance between them.

This tells you that balls near each other will have less gravitational attraction than balls touching. This eliminates choices C and D.

The meaning of the word "near" each other comes into play here. If we assume that the geometry of concern has the balls at the same distance relative to their diameter, then we can look a the mass a and diameter of a soccer ball and a tennis ball to determine which pair will have less gravitational attraction.

Here are the relevant specifications:

The fact that dimensions are mixed US and metric units is of no consequence. (The conversion factors will be the same in both cases.)

So, we can approximate the relative gravitational attraction with a "figure of merit" that is ...

  fom = mass/diameter²

The attached calculator shows this figure of merit for the two ball types. The lesser value corresponds to the lesser force of gravity between soccer balls.

  fom (soccer ball) ≈ 4.9

  fom (tennis ball) ≈ 7.7

Two soccer balls near each other will have the smallest gravitational force.

The magnitude of the boat’s resultant velocity with respect to the starting point is 6.0 m/s. Hence, option (3) is correct.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

The velocity of the boat in  still water = 5 meters per second along east.

The velocity of stream =  3.3 meters per second along south.

Hence, the magnitude of the boat’s resultant velocity with respect to the starting point is = √(5² + 3.3²) m/s

=6.0 m/s.

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Answer:

They can go through humans damaging their tissue.

Explanation:

Gamma rays are very dangerous in comparison to other rays such as radio waves as gamma rays have a higher frequency. This higher frequency gives them an immense about of energy in comparison to other waves. They have more penetrating power and are able to damage human tissue... which is dangerous.

Answer:

The maximum height with respect to the ground is 1.5m + 4m/s2 x (4m/s/2) = 6m.