Identify a true statement about premarital education programs. Multiple Choice They tend to hinder the level of communication between couples. They are linked to a lower level of marital satisfaction. They tend to increase the likelihood of divorce. They are linked to a higher level of commitment to a spouse. Anorexia nervosa and bulimia nervosa affect Multiple Choice men more than women. women more than older men but less than younger men. men and women equally. women more than men. Which of the following statements is true of pubertal growth spurt? Multiple Choice During their growth spurt, girls increase in height about 4 Inches per year. The peak rate of pubertal change occurs at 11 years for boys. The mean age at the beginning of the growth spurt in girls is 11. The growth spurt occurs approximately 2 years earlier for girls than for boys.

The ratio of oscillation frequency for a fly with mass m to a fly with mass 4.6m is 2.14 : 1.

The formula to calculate the frequency of oscillation for a block on a spring
[tex]\omega = \sqrt{\frac{k}{m}}[/tex]
ω²m = k

If two flies are caught in similar threads, then the magnitude of k or the constant from the threads is the same. The oscillation frequency ratio is the ratio of the inverse of the root mass.

[tex]\frac{\omega_1}{\omega_2} = \frac{\sqrt{m_2}}{\sqrt{m_1}}[/tex]

ω₁² : ω₂² = m₂ : m₁

ω₁² : ω₂² = 4.6m : m

ω₁² : ω₂² = 4.6 : 1

[tex]\omega_1 \::\: \omega_2 = \sqrt{4.6} \::\: \sqrt{1}[/tex]

ω₁ : ω₂ = 2.14 : 1

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Gravitational collapse is the contraction of an astronomical object because of the impact of its personal gravity, which tends to draw count inward in the direction of the middle of gravity.

Gravitational collapse apart is a fundamental mechanism for structure formation within the universe.

At a low mass, gravity may be counteracted by way of a low pressure, which means that low pressure and density. as the mass will increase, the pressure increases, and eventually either the temperature or the density is adequately high to motive gravitational collapse.

The universe is everything. It consists of all of space, and all of the be counted and power that area includes. It even consists of time itself and, of route, it consists of you. Earth and the Moon are part of the universe, as are the alternative planets and their many dozens of moons.

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Answer:

Yeah exactly.

Explanation:

Look here down.

From Newtond second law of motion.

And this force is included the force of weight which changes from ma to mg

The compressed air must exert a force of 508.47N on the small piston in order to lift the car weighing 13300 N and the pressure exerted is 16.14x10^4Pa.

Given  circular cross-section having a radius (r1) = 3.17cm = 3.17x10-2m

The pressure is transmitted by a liquid to a second piston of radius (r2) = 16.2cm = 16.2x10-2m

Force exerted on car (F2) = 13300N

Here pascals principle is applied.

We know that Pressure (P) = force/area

P1 = P2 then F1/A1 = F2/A2

Area of the circle = π*r²

F1/π*(3.17x10-2)^2 = 13300/π*(16.2x10-2)^2

F1 =  508.47N

(b) The air pressure will produce a force of that magnitude P =F/A

P = F1/A1 = 508.47/ π*(3.17x10-2)^2 = 16.14x10^4Pa

(c) As a result, the work is equal in both pistons. The little piston displaces a small volume of liquid, which is dispersed across the large piston in a thin layer.

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complete question: In a car lift used in a service station, compressed air exerts a force on a small piston of circular cross section having a radius of r1 = 3.17 cm. This pressure is transmitted by an incompressible liquid to a second piston of radius 16.2 cm. (a) What force must the compressed air exert on the small piston in order to lift a car weighing 13,300 N? Neglect the weights of the pistons. (b) What air pressure will produce a force of that magnitude? (c) Show that the work done by the input and output pistons is the same.

The ratio of power emitted to the total power applied to the antenna is known as radiation efficiency. The equation for radiation efficiency, r=PrPr+Pl, is accurate.

How is radiation efficiency determined?

The ratio of an antenna's output power to the power input into its excitation port is known as the radiation efficiency of the antenna. Here, the power loss resulting from port impedance mismatch is not taken into account. The radiation effectiveness of a lossless antenna in its ideal

What are total efficiency and radiation efficiency?

Losses in the conductor and the dielectric dissipate the power that is not radiated. Total efficiency measures how much power is incident from the network and how much is radiated, taking into account both reflection loss and energy dissipation.

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Due to the fact that it is more difficult to initiate motion than to maintain it, the coefficient of kinetic friction is almost always lower than the coefficient of static friction.

The form of friction between static or motionless surfaces is known as static friction. On the other hand, kinetic friction is the resistance between two surfaces while at least one of them is moving.

Due to the fact that there are more forces operating to maintain an object stationary on a given surface than there are forces resisting an object in motion, the coefficient of static friction is always greater than or equal to the coefficient of kinetic friction.

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Work  =  (force) x (distance)

Force exerted on the box  =  10 Newtons

Dictance the box travels  =  6 meters  

Work = (force) x (distance)

Work = (10 N) x (6 meters)

Work = 60 Newton-meters

Work = 60 Joules  (A)

Mass of the box . . . . . . .. |

Coefficient of friction . . . |  We don't care about

Force of friction . . . . . . .. |  any of these things.

Color of the box . . . . . . . |  They don't matter

Price of the box . . . . . . .. |  or make any difference.

Contents of the box . . .. |

Temperature of the box.|

Dimensions of the box .. |

Age of the box . . . . . . . . |

The force required is 69 N at the given angle, perpendicularly, by using the formula of Torque, to loosen the bolt.

What is Torque?

The rotational counterpart of linear force is torque. Depending on the subject of study, it is also known as the moment, moment of force, rotating force, or turning effect. It depicts how a force can cause a change in the body's rotational motion.

An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Calculations:

Given,

Force = 60N

Angle = 30°

Radius = 0.3m

The torque required to loosen the bolt = Torque = r * F

            = 0.3 * 60

            = 1.8Nm

To obtain the same torque but with a 30° angle

Torque = F ( 0.3 * cos 30)

1.8Nm =  F ( 0.3 * cos 30)

F = 1.8Nm/ F ( 0.3 * cos 30)

F= 69N.

Hence, the force required is 69 N at the given angle, perpendicularly.

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Answer:

The required volume of the given cylinder will be 1607.7 cubic inches.

What is the volume of a cylinder?

The volume of a cylinder is equal to the product of the area of the circular base and the height of a cylinder. The volume of a cylinder is defined as the space occupied by the cylinder as the volume of any three-dimensional shape is the space occupied by it

V = πr²h

where 'r' is the radius of the base (circle) of the cylinder

'h' is the height of the cylinder

Given that the radius and height of a cylinder are 8 in. and 8 in. respectively

The volume of a cylinder V = πr²h

As per the given question,

Here r = 8 in. and h = 8 in.

The of a cylinder = 3.14 × (8)² × (8)

Apply the multiplication operation,

The volume of a cylinder = 1607.7 cubic inches

Therefore, the required volume of the given cylinder will be 1607.7 cubic inches.

4.28 m/s is the bird's speed immediately after swallowing the insect.

A) The birds speed after swallowing the insect is = 4.84 m/s

Given data :

mass of bird ( M₁ )  = 240 g

speed of bird ( U₁ ) = 6 m/s

mass of insect ( M₂ ) = 12 g

speed of insect ( U₂ )  = 30 m/s

Determine the birds speed of the bird

A) Birds speed after swallowing the insect

we will apply the principle of momentum conservation

M₁U₁  +  M₂U₂ = ( M₁ +M₂ )V

= 240*6 - 12*30 = ( 240 + 12 ) V

= 1440 - 360 = 252 V

therefore ; V =  1080 / 252 = 4.28 m/s is the bird's speed.

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The change in entropy of a system will be 6.25 kJ/K. For further explanation you can read below.

The change in entropy of a system is given by the equation ΔS = Q/T, where Q is the heat transferred and T is the temperature at which the transfer occurs. In this case, the temperature of the hot water is initially 1.00×102 ∘C and it cools to room temperature, which is 20.0 ∘C. Note that entropy is a measure of the disorder or randomness of a system, and that this calculation assumes that the heat from the hot water is completely transferred to the room, increasing its disorder. It also assumes that the specific heat of the cup and any change in temperature of the room are negligible, which is generally a good approximation for a small cup of hot water in a large room.

We can therefore calculate the change in entropy of the room as follows:

ΔS = Q/T = (125 g * 1.00×102 ∘C - 125 g * 20.0 ∘C) / (20.0 ∘C)

      = 6.25 kJ/K

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Therefore, the apparent weight of 1.1 g of water is 3.57 N.

What is  apparent weight?

According to physics, an object's perceived weight is a characteristic that describes how heavy it is. When the force of gravity acting on an item is not counterbalanced by a force of equal but opposite normality, the apparent weight of the object will differ from the actual weight of the thing.

given

Speed of rotation, N = 1300 rpm

diameter, d = 35 cm, so that

radius, r = 17.5 cm = 0.175 m

mass of drop = 0.80 g = 0.80 *10^-3 kg

Angular speed of water, ω = 2πN/60

ω = 2π*1300/60

ω = 8169.2/60

ω = 136.15 rad/s

apparent weight will be gotten by

W(a) = mω²r

W(a) =  0.80*10^-3 * 136.15² * 0.175

W(a) =  0.80*10^-3 * 18536.82 * 0.175

W(a) = 3.57 N

Therefore, the apparent weight of 1.1 g of water is 3.57 N.

Complete question: The spin cycle of a clothes washer extracts the water in clothing by greatly increasing the water's apparent weight so that it is efficiently squeezed through the clothes and out the holes in the drum. In a top loader's spin cycle, the 35-cm-diameter drum spins at 1300 rpm around a vertical axis.

What is the apparent weight of a 0.80 g drop of water?

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The Coefficient of friction u = 0.078    

Calculate the following?

Radius of curvature r = 200 m

First we need banking angle at v = 60 Km/h = 60(1000 m/3600 s) = 16.66 m/s

At this speed (for which the road is designed)

Coefficient of friction  v^2/rg = sin A

sin A  = (16.66)^2/(200*9.8)

sin A  = 0.1416  

A = 8.141 degrees

For no slipping at the banking angle at  the lower Speed v = 40 Km/h = 40 (1000 m/3600 s) =11.11 m/s  ,

mv^2/r = mg sin A - u mg cos A

0.617 = (9.8*0.1416) - u (0.9899*9.8)

0.617 = 1.387 - u (9.7)

9.78 u = 0.77

∴ Coefficient of friction u = 0.078    

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The firefighter will slide down upto a distance of  11.68 m.

A firefighter is a first responder with extensive training in firefighting, primarily to extinguish dangerous fires that threaten life, property and the environment, as well as to rescue people and, in some cases or jurisdictions, animals from dangerous situations.

Mass of the firefighter = m = 94kg

Frictional force = F = 800N

Speed at the bottom of the pole = 3.9m/s

Using the work energy theorem which says that initial potential energy is equal to the sum of final kinetic energy and work done.

mgh = (1/2)mv² + W

mgh = (1/2)mv² + Fh

h = height at which firefighter will slide down

h (mg - F) = (1/2)mv²

h = (1/2)mv² /  (mg - F)

h = mv² / 2 (mg-F)

h = 94* (3.9)² / 2 (922.14 - 800)

h = 1429.74/122.14

h =  11.68 m

He will slide 11.68 m down the pole.

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"Dorsiflexion" is the lifting of the front of foot to direct the top of the foot toward the front leg.

The backward bending then contracting of the hand or foot is known as dorsiflexion.

Thus, Dorsiflexion is the lifting of the front of the foot to direct the top of the foot toward the front leg.

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The complete question is-

what is movement of the foot upwards, as when walking on your heels, called?

multiple choice question.

An accelerating universe is currently the most accepted in light of the discovery of dark energy.

A hypothesized energy known as "dark energy" acts in opposition to gravity by exerting a repellent, negative pressure. It has been proposed to explain the observable characteristics of far-off type Ia supernovae, which reveal the universe is expanding at a faster rate than usual.

Saul Perlmutter, Brian Schmidt, and Adam Riess are the recipients of the 2011 Nobel Prize in Physics. They made the stunning conclusion that the universe's expansion is speeding up as a result of their observations of far-off stars exploding.

The distance measurements utilizing type Ia supernovae (SN Ia) for the galaxies at high redshift provide the most direct and compelling evidence for the expanding cosmos powered by dark energy.

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(a)If the battery is inserted into the circuit at time t=0, then at time t, the current is provided by i=/R(1et/L), where L=L/R. The moment that i=0.800dR must be found is our objective. This suggests that 0.800=1 et/L and 0.200 et/L.

We get (t/L)=ln(0.200)=1.609 by taking the natural logarithm of both sides. Thus,[tex]t=1.609τ L​ = R1.609L​ = 1.20×10 3 Ω1.609(6.30×10 −6 H)​ =8.45×10 −9 s[/tex].

There are various uses for resistors. A few examples include restricting the flow of electricity, dividing the voltage, producing heat, matching and loading circuits, controlling gain, and establishing time constants.

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Two methods based on the scattering and absorption of light by a dispersion of colloidal particles are turbidimetry and nephelometry. The detector in turbidimetry is positioned parallel to the source.

Colloidal particles: What are they?

Small solid particles known as colloidal particles are dispersed in a fluid phase. Typically, they range in size from 10 nm to several microns. As long as the buoyancy imbalance between both the nanoparticles and the liquid is not too great, they are now small sufficiently to be sustained in the flow by thermal motion.

How are colloidal particles formed?

Particles of colloidal size are formed by two methods: Dispersion methods: that is, by breaking down larger particles. For example, paint pigments are produced by dispersing large particles by grinding in special mills. Condensation methods: that is, growth from smaller units, such as molecules or ions.

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A block of mass 2 kg travels along a horizontal friction less surface with velocity 3 m/s. the mass collides with another mass, m, and rebounds with velocity -1 m/s. Thus, impulse was delivered to mass m = 8 kg.m/sec.

Since fast-acting force or "impact" is what is meant when the word "impulse" is used, it is possible to define impulse as "the abrupt force operating on an item for a brief period of time."

In physics, the term "impulse" is used to characterize or measure the impact of force operating gradually to alter an object's motion.

Given that,

mass of block = 2 kg

horizontal friction less surface with velocity =  3 m/s.

the mass collides with another mass m and rebounds with velocity -1 m/s.

So, impulse = mass × (change in velocity)

or, impulse = 2 kg × [3-(-1) m/sec]

or, impulse = 8 kg .m/sec

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The maximum acceleration of a platform is 92.7 m/s².

What is an oscillation?

Oscillation is the process of any quantity or measure repeatedly varying about its equilibrium value in time. A periodic variation of a substance between two values or around its center value is another definition of oscillation.

We know,

The acceleration amplitude = [tex]a_{m}[/tex] = ω²[tex]x_{m}[/tex]

Here,

ω = angular frequency (ω=2[tex]\pi[/tex]f)

There are 2[tex]\pi[/tex] radians in one cycle, so we obtain:

[tex]a_{m}[/tex] = ω²[tex]x_{m}[/tex] = (2[tex]\pi[/tex]f)²[tex]x_{m}[/tex] = (2[tex]\pi[/tex](9.90Hz)²(0.024m) = 92.7 m/s².

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The momentum of the probe Pf  = + 5.1 x [tex]10^{7 }[/tex] kg m/s.

Find the attachment answer

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A transverse wave oscillates perpendicular to the direction of energy transfer. A = Crest, B = trough, C = Amplitude, and D =  Wavelength.

What is a transverse wave?

In physics, A wave whose oscillations are perpendicular to the direction of the wave's advance is called a transverse wave. This is the difference from a longitudinal wave which travels in the direction of its oscillations. Water waves are samples of a transverse wave. A simple example is given by the waves that can be built on a horizontal length of the string by anchoring one end and moving the other end up and down.

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The total number of valence electrons are present in this compound is 36, total bonding electrons are 8, total lone pair electrons are 28

a)The total number of valence electrons are present in this compound

Each chlorine contributes 7 Valence electrons

Krypton atom has 8 valence electrons

total number of valence electrons are 8 + (7 × 4) = 36e

b)Total bonding electrons are 4 single bonds

Therefore, Total bonding electrons are 4 × 2 = 8e

c)Krypton atom has Two lone pairs on it, chlorine has three lone pairs .

Total lone pair compounds are 2 × (4 × 3) = 14 one pairs

Total lone pair of electrons 2 × 14 =28e

An electron in an atom's outer shell is known as a valence electron, and if the outer shell is open, the valence electron can take part in the formation of a chemical bond.

The valence of an element—whether it can bond with other elements and, if so, how readily and with how many other elements—may be determined by the existence of valence electrons. Thus. the electrical. arrangement. of an element has a significant. impact on its. reactivity. A valence electron can only be found in the outermost electron shell of a main-group element; but, in a transition metal, it can also be found in an inner electron shell.

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One simple resultant vector is produced when two vectors are added. Depending on the quantity that the resultant vector represents, we can infer its meaning.

In order to directly sum the two velocities, we can use the formulae v tot = v x 2 + v y 2 v tot = v x 2 + v y 2 and = tan 1 (v y / v x) = tan 1 (v y / v x).

A resulting displacement results from the addition of displacement vectors. The only requirement is that the two vectors must be of the same vector quantity in order to add them. There will be a consequent velocity if two additional velocity vectors are added. There is a resultant force when two vectors are added.

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The frequency received by the person is 643 Hz.

The Doppler effect states that the frequency of a sound wave is changed due to the motion of the source and the observer. The frequency of the sound wave will decrease as the source moves away from the observer and increase as it approaches.

The frequency received by the person can be calculated using the following formula:

F = (V + v) / (V - v) * F0

Where F is the frequency received by the observer, V is the speed of sound, v is the speed of the source and F0 is the frequency of the sound emitted by the source.

In this case, V = 341 m/s, v = 130 km/h = 36.1 m/s, F0 = 800 Hz.

Substituting these values into the formula, we get:

F = (341 + 36.1) / (341 - 36.1) * 800 = 643 Hz.

Therefore, the frequency received by the person is 643 Hz.

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As long as their contents are the same, the buoyant force is stronger on the life jacket that is filled to the same level when both are totally immersed.

In science, "force" refers to a certain concept. An object cannot hold a force; it is impossible. A force is experienced by one item from another. In the notion of a strength, both of these would be intriguing inanimate objects.

The word "energy" refers to a body's innate propensity to alter or adapt its structure in response to an outside force. each time a force is used.

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Answer:

d

Explanation:

Density, temperature, and pressure increase as you move inward in the interior of the Sun. This means that the weight of the star pushing inward at a given radius _________ as you move inward toward the core.

a. increases

b. decreases

c. stays the same

d. There is not enough

The width of the slit is 0.212 mm.

The wavelength of light is defined as “The distance between the two successive crests or troughs of the light wave”.

We know that the distance between minima is given by :

                                       [tex]t = (m_{f} - m_{i} ) \alpha x/d[/tex]

where, t = distance between minima

            [tex]\alpha =[/tex] wavelength

            x = distance of screen

            d = width of slit

            [tex](m_{f} - m_{i} ) =[/tex] difference between minima

Given, x = 40 cm = 0.4 m

           [tex]\alpha = 690 nm = 690 * 10^{-9} m[/tex]

           t = 2.60 mm = [tex]2.60 * 10^{-3} m[/tex]

           [tex](m_{f} - m_{i} ) =[/tex] 3 -1 = 2

Putting these values in above equation we get d = 0.212 mm

So the width of the slit is 0.212 mm.

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The capacitance if an insulator with dielectric constant κ and thickness d/2 is slipped between the electrodes C = 2K∉A/d

Let A represent the cross-sectional area of the electrodes.

Let C stand for capacitance.

The electric field between the electrodes is denoted by E.

Be the charge per unit area, sigma.

be the permittivity of empty space, and K is assumed to be an insulator's dielectric constant in the question.

It is inserted between the electrodes as d/2.

the current electric field between electrodes.

E equals sigma /2 plus sigma /2.

E = sigma/ ——— As we are aware, E = V /(d/2)

V=E d/2 V=sigma /*d/2

V = dsigma/2 ——— Once more, we are aware of 2.

C = Q/V

C is equal to sigma A/(sigma d/2) Q = sigma A (from equation 2

For an insulator with a dielectric constant of K, C = 2A/d.

C = 2K∉A/d

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Answer:

45 newtons

Explanation:

A person exerts a force of 45 N at an angle θ then the work done by the person on the crate will be 173.48 J.

Work is a physics term used to describe the transfer of energy that takes place when an object changes above a distance because of an external force, at least some of which is given in the vector of the dislocation. The element of the force acting all along the path multiplied by the length of the path can be used to calculate work if the force is constant.

Mathematically, this idea is expressed as W = fd, where W is the effort and f is the force multiplied by d, the distance. Work is completed whenever the force is applied at an angle of with regard to the displacement.

As per the given information in the question,

Force, F = 45 N

Weight, w = 100 N

Distance, d = 4 m

The Vertical component of force, f(y) = 12 N.

To determine the force's component parts in this situation, we need formulae.

The horizontal component, F(x) = F cos θ

The vertical component, F(y) = 12 N

As the force F is given as 45 N, then,

45 sin θ = 12

sin θ = 12/45

θ = 15.466

Now,

F(x) =  F cos θ

= 45 cos (15.466)

F(x) = 43.37 N

The work required to move the crate 4 meters is determined by this horizontal component:

W = F(x) × D

W = 43.37 × 4

W = 173.48 J.

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