Doug’s average driving speed is 1 kilometers per hour faster than Thor’s. In the same length of time it takes Doug to drive 390 kilometers, Thor drives only 384 kilometers. What is Doug’s average speed?

Answer:

Elastic potential energy, E = 3.26 J

Explanation:

It is given that,

Force constant of the spring, k = 5.2 N/m

Relaxed length of the spring, X = 2.45 m

When the mass is attached to the end of the spring, the vertical length of the spring is, x' = 3.57 m

To find,

The elastic potential energy stored in the spring.

Solution,

The extension in the length of the spring is given by :

[tex]x=x'-X[/tex]

[tex]x=3.57\ m-2.45\ m[/tex]

x = 1.12 m

The elastic potential energy of the spring is given by :

[tex]E=\dfrac{1}{2}kx^2[/tex]

[tex]E=\dfrac{1}{2}\times 5.2\times (1.12)^2[/tex]

E = 3.26 J

So, the elastic potential energy stored in the spring is 3.26 joules.

The Elastic Potential Energy stored  in the  spring mass system

= 3.26 Joule

The Elastic Potential Energy Stored (E) in the  spring mass system  is given by equation (1)

E = (1/2) [tex]\times K \times x^2[/tex]........(1)

Where K is the Force Constant = 5.2 N/m

and  [tex]x[/tex] is the extension or compression of the spring.

Here as the spring length increases  so  [tex]x[/tex] = Final Length - Initial Length

= (3.57- 2.45) = 1.12 m

E    = (1/2) [tex]\times[/tex]5.2 [tex]\times[/tex][tex]1.12^2[/tex] = 3.26144 [tex]\approx[/tex] 3.26 Joule

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Answer:

T = 23.92 m

Explanation:

given,

mass of the diver = 50.9 Kg

Resistant force from the water = f = 1492 N

diver come top rest under water at a distance = 6 m

acceleration due to gravity = 9.81 m/s²

final velocity = v  = 0 m/s

initial velocity = u = ?

total distance = ?

Now acceleration of body under water

f = m a

[tex]a = \dfrac{1492}{50.9}[/tex]

[tex]a = 29.31\ m/s^2[/tex]

using equation of motion

v² = u² + 2 a s

0 = u² - 2 x 29.31 x 6

[tex]u = \sqrt{2\times 29.31\times 6}[/tex]

u = 18.75 m/s

now.

calculating distance of the diver in air

v² = u² + 2 a s

0 = 18.75² - 2 x 9.81 x s

s = 17.92 m

total distance

T = 17.92 + 6

T = 23.92 m

the total distance between the diving board and the diver’s stopping point underwater T = 23.92 m

Answer:

It is known as the centripetal vector directed to the centre of the fictious circumference

The acceleration vector of a particle in uniform circular motion always points towards the center of the circle

The total acceleration vector of a particle in uniform circular motion always points towards the center of the circle. It is directed perpendicular to the velocity vector and its magnitude is given by [tex]a = v^2/r,[/tex] where v is the magnitude of the velocity vector and r is the radius of the circle.

For example, when a car is moving in a circular path on a banked turn, the acceleration vector points towards the centre of the turn, keeping the car on the circular track. In summary, the acceleration vector of a particle in uniform circular motion is always directed towards the centre of the circle and its magnitude is given by [tex]a = v^2/r,[/tex]

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Answer: The Sun is at the center of the solar system and the planets move around it.

Explanation:

During the Middle Ages, it was believed that the Earth remained motionless, occupying the center of a universe subject to uniform circular motion where Earth was the only world. All this because the only accepted idea was that of Ptolemy.  

Until the Polish astronomer Nicolaus Copernicus proposed that the Earth annually orbits the Sun and rotates once a day on its own axis.  He also dared to affirm that the other planets also orbited the Sun as a fixed point. This meant the Earth was no longer unique, nor did it occupy the center of the known universe.  

On the other hand, Galileo observed Venus with his telescope and found out it presented phases (such as those of the moon) together with a variation in size; observations that are only compatible with the fact that Venus rotates around the Sun and not around Earth.

These observations and discoveries were presented by Galileo to the Catholic Church (which supported the geocentric theory at that time) as a proof that completely refuted Ptolemy's geocentric system and affirmed Copernicus' heliocentric theory.

It is important to note, this was the main reason for Galileo to be arrested.

Answer:

Fusion of hydrogen to helium

Explanation:

The sun produces its energy mainly by fusing hydrogen nuclei to form helium.

In the sun 4 hydrogen nuclei join to form one of helium, this fusion releases a lot of energy and because this fusion occurs in large quantities, this is where the energy of a star like our sun is produced, and that is the reason of its plasma state.

The energy produced in the fusion is received on earth in the form of electromagnetic radiation.

a) The translational kinetic energy of the disk across the level surface is 17.58J.

b) The rotational kinetic energy of the disk is 8.79J.

Given the data in the question;

a)

Translational kinetic energy.

Translational kinetic energy of an object is the work needed to accelerate the object from rest to a given velocity. It is expressed as:

[tex]Translational\ K_E = \frac{1}{2}mv^2[/tex]

We substitute our given values into the equation

[tex]Translational\ K_E = \frac{1}{2}*2.50kg\ *\ (3.75m/s)^2\\\\Translational\ K_E = \frac{1}{2}*2.50kg\ *\ 14.0625m^2/s^2\\\\Translational\ K_E = 17.58kg.m^2/s^2\\\\Translational\ K_E = 17.58J[/tex]

Therefore, the translational kinetic energy of the disk across the level surface is 17.58J

b)

Rotational kinetic energy

Rotational kinetic energy is the energy of rotation of a rotating rigid object or system of particles. its is expressed:

[tex]Rotational\ K_E = \frac{1}{2} Iw^2[/tex]

Where is moment of inertia around the axis of rotation and ω is the angular velocity.

Also, [tex]Moment\ of\ Inertia\ I = \frac{1}{2}mr^2[/tex]

Angular velocity ω is analogous to linear velocity v

So, [tex]v = wr \ and\ w = \frac{v}{r}[/tex]

Hence;

[tex]Rotational\ K_E = \frac{1}{2} * \frac{1}{2}mr^2* (\frac{v}{r})^2\\\\Rotational\ K_E = \frac{1}{2} * \frac{1}{2}mr^2* \frac{v^2}{r^2}\\\\Rotational\ K_E = \frac{1}{2} * \frac{1}{2}mv^2[/tex]

We substitute in our values

[tex]Rotational\ K_E = \frac{1}{2} * \frac{1}{2}*2.50kg * (3.75m/s)^2\\\\Rotational\ K_E = \frac{1}{2} * \frac{1}{2}*2.50kg * 14.0625m^2/s^2\\\\Rotational\ K_E = 8.79kg.m^2/s^2\\\\Rotational\ K_E = 8.79J[/tex]

Therefore, the rotational kinetic energy of the disk is 8.79J

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Explanation:

Given that,

Mass of thee pool ball, m = 3 kg

Initial speed of the ball, u = -4.3 m/s

Impulse experienced by thee ball, J = -4 N-s

To find,

Speed of the object after impulse occurs and its direction.

Solution,

Let left side is negative and right side is positive. So, the change in momentum or the impulse is given by the following expression as :

[tex]J=m(v-u)[/tex]

[tex]v=\dfrac{J}{m}+u[/tex]

[tex]v=\dfrac{-4}{3}+(-4.33)[/tex]

v = -5.663 m/s

So, the speed of the object is 5.663 m/s and it is towards left.

The pool ball experiences an impulse in the opposite direction of its initial motion. After the impulse, the speed of the ball reduces to 2.97 m/s and it is still moving to the left.

The subject of this question is Physics, specifically impulse and momentum. Firstly, we need to calculate the initial momentum which is the mass of the object multiplied by its initial velocity, so that will be 3.00 kg * 4.30 m/s = 12.90 kg*m/s to the left since the direction is towards left.

An impulse is the change in momentum, and in this case, the impulse is -4.00 Ns which means it acts in the opposite direction of the initial motion, i.e to the right.

After the impulse, the final momentum will be the sum of initial momentum and impulse: 12.90 kg*m/s (to the left) + -4.00 kg*m/s (to the right) = 8.90 kg*m/s (to the left).

Finally, to calculate the final speed, divide the final momentum by the mass: 8.90 kg*m/s ÷ 3.00 kg = 2.97 m/s. So, after the impulse, the object's speed is 2.97 m/s and it is still moving to the left.

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Answer:

d) Decrease, increase, remain constant

Explanation:

If one tire has a slow leak, the air pressure within the tire will_DECREASE____with time due to outflow of air , the surface area between the tire and the road will__INCREASE__in time,due to flattening of tire.

The net force the tire exerts on the road will_REMAIN CONSTANT____in time. It is so because force does not depend upon area. It is pressure which depends upon area. As there is no change in the weight of the car , force on the road will remain constant.

Answer:

a

Explanation:

The most reasonable conclusion of the above phenomenon is that water is a poor conductor of heat. Basically water is an insulator. The heat from surface to the bottom of the beaker will take a lot of time. Moreover, no convection current is formed so, heat might not even reach the bottom surface. Hydrogen bonding also play a vital role in determining the thermal properties of water.

hence option A is correct

The most reasonable conclusion from the observation that only the surface of the water in a beaker boils is that water is a poor conductor of heat, which leads to inefficient heat transfer through its body. So the correct option is a.

If a beaker of water is placed under a broiler, with the observation that only the surface layer boils while the water at the bottom of the beaker remains close to the initial temperature, it can be concluded that water is a poor conductor of heat. This phenomenon happens because heat is not efficiently transferred through the body of the water from the hot surface at the top to the cooler sections below. In this scenario, the heat from the broiler predominantly warms the water by radiation directly at the surface, but the lack of conduction prevents the lower part of the water from reaching the boiling point.

Heat conduction in materials depends on the kinetic energy transfer between molecules. Good conductors, like metals, allow for a rapid heat flux due to the effective transfer of energy during molecular collisions. In contrast, poor conductors experience less efficient energy transfer, resulting in a slower rate of heat flow. Additionally, convection could play a role in heat distribution, but in this case, the observation that only the surface boils suggests conduction is the limiting factor for heat transfer to the bottom of the beaker.

Answer:

Explanation:

Given to find the pressure

v = 12.6 m/s , A = 3.0m * 1.8 m = 54 m^2

p air = 1.3 kg/m^3

F = 1/2 * p *v^2 *A

F = 1/2 *1.3 kg/m^3 * (12.6 m/s)^2 * 54m^2

F = 5572.476 N

The stress and the pressure can find across the area

α = F /A

α = 5572.476 N / 54 m^2

α = 103.194 Pa

Answer:

As a result of the violent revolts in france in july 1830 gave up the throne and fled for Great Britain.

Explanation:

Following Charles X taking the throne of France, he strengthened the power of the clergy and the monarchy. In 1830, Charles X attempted to suppress the Constitution, suspend Parliament, and shut down the press. The press disobeyed and encouraged mobs to protest. The protests got violent and fearing for his life, Charles X stepped down from the throne and took his family to Great Britain.

Answer:

[tex]r_k=0.5r_e[/tex]

Explanation:

[tex]M_e[/tex] = Mass of Earth

[tex]M_k[/tex] = Mass of Kardashia = [tex]4M_e[/tex]

[tex]R_e[/tex] = Radius of Earth

[tex]R_k[/tex] = Radius of Kardashia

Gravitational force of Earth on object

[tex]F_e=\frac{GM_em}{r_e^2}[/tex]

Gravitational force of Kardashia on object

[tex]F_k=\frac{GM_km}{r_k^2}\\\Rightarrow F_k=\frac{G4M_e}{r_k^2}[/tex]

The gravitational force i.e., the weight of the body is same on both the planets

[tex]F_e=F_k[/tex]

If the same particle is used then the mass will also be equal

Dividing the forces

[tex]\frac{F_e}{F_k}=\frac{\frac{GM_em}{r_e^2}}{\frac{G4M_e}{r_k^2}}\\\Rightarrow 1=4\frac{r_k^2}{r_e^2}\\\Rightarrow r_k^2=\frac{1}{4}r_1^2\\\Rightarrow r_k=\frac{1}{2}r_e\\\Rightarrow r_k=0.5r_e[/tex]

The radius of the planet Kardashia is half of the radius of Earth

Answer:  The correct answer is :  have entered into G0

Explanation:  G0 is the fifth phase, it is named because it is out of the cycle, it is still for an undefined time when new cells are not needed and in this phase the cell is not in division and has lost the ability to perform mitosis.

Answer: At the period that's between its peaks of brightness and its luminosity.

Explanation:

The two observable properties of a cepheid variable that are directly related to one another at the period between its peaks of brightness and its luminosity. The period-luminosity relation allows us to determine its luminosity from the period between its peaks of brightness. In astronomy, a period-luminosity relation is a relationship linking the luminosity of pulsating variable stars with their pulsation period. The popular relation, for Classical Cepheid variables, is also called Leavitt's law

Final answer:

An ionic bond is the electrostatic attraction that holds together ions with opposite charges in an ionic compound, such as sodium and chlorine forming table salt.

Explanation:

The electrostatic attraction that binds oppositely charged ions together is known as an ionic bond. This type of chemical bond is fundamental in the formation of ionic compounds where electrons are transferred from one atom to another, such as the formation of table salt from sodium and chlorine.

Ions are created when atoms either lose or gain electrons, leading to the formation of cations (positively charged) and anions (negatively charged). The electrostatic attraction between these ions of opposite charge results in a stable ionic structure. For instance, a sodium ion (Na+) will form a stronger ionic bond with a 2+ charge than with a 1+ charge due to the increased electrostatic attraction.

Answer:

Maximum height attained by the ball will be h = 28.416 m

Explanation:

We have given initial speed of the ball u = 23.6 m /sec

At maximum height velocity will be zero so final velocity v = 0 m/sec

Acceleration due to gravity [tex]g=9.8m/sec^2[/tex]

From law of motion we know that [tex]v^2=u^2-2gh[/tex]

[tex]0^2=23.6^2-2\times 9.8\times h[/tex]

h = 28.416 m

So maximum height attained by the ball will be h = 28.416 m

Answer:

a. 2.64 m/s

b. 5.9 m/s

c. 997.92 m3

Explanation:

As this is steady flow, the mass flow rate is constant, and so is the product of flow velocity and cross-sectional area

av = 0.077 * 3.6 = 0.2772 m3/s

We can calculate the speed at various areas by dividing the product above by area

a.[tex]v_1 = 0.2772 / a_1 = 0.2772 / 0.105 = 2.64 m/s[/tex]

b.[tex]v_2 = 0.2772 / a_2 = 0.2772 / 0.047 = 5.9 m/s[/tex]

c. Since the volume discharge rate is 0.2772 cube meters per second. In 1 hour, or 60 * 60 = 3600 seconds, the total volume of water discharged would be

0.2772 * 3600 = 997.92 m3

A water pipe with a varying cross-sectional area has a flow rate of 0.277 m³/s at one point. Over one hour, the pipe discharges 1000 m³ of water.

a. Since the water is incompressible, the volume flow rate at all points in the pipe must remain constant. This means that the product of the cross-sectional area and the fluid velocity must be the same at every point.

Using the continuity equation, we can calculate the fluid velocity at points 2 and 3:

V1 * A1 = V2 * A2

3.60 m/s * 7.70×10−2 m2 = V2 * 0.105 m2

Solving for V2:

V2 = (3.60 m/s * 7.70×10−2 m2) / 0.105 m2

V2 ≈ 2.64 m/s

Similarly, for point 3:

V1 * A1 = V3 * A3

3.60 m/s * 7.70×10−2 m2 = V3 * 0.047 m2

Solving for V3:

V3 = (3.60 m/s * 7.70×10−2 m2) / 0.047 m2

V3 ≈ 5.898 m/s

b. To calculate the volume of water discharged from the open end of the pipe in 1.00 hour, we need to determine the volume flow rate and multiply it by the time.

Volume flow rate = Cross-sectional area * Fluid velocity

Volume flow rate = 0.047 m2 * 5.898 m/s

Volume flow rate ≈ 0.277 m³/s

Volume of water discharged in 1.00 hour:

Volume flow rate * Time

0.277 m³/s * 3600 s/hour

≈ 999.12 m³

Since the volume of water discharged in 1.00 hour is close to 1000 m³, we can round it to 1000 m³.

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Answer:

Bird's speed immediately after swallowing = 4.52 m/s

Explanation:

Here momentum is conserved.

Initial momentum = Final momentum

Mass of bird = 300 g = 0.3 kg

Velocity of bird = 5.5 m/s

Mass of insect = 10 g = 0.01 kg

Velocity of insect = -25 m/s ( opposite to the motion of bird)

Initial momentum = 0.3 x 5.5 + 0.01 x -25 = 1.4 kgm/s

Final mass = 0.3 + 0.01 = 0.31 kg

Initial momentum = Final momentum = 1.4 kgm/s

                 1.4 = 0.31 x Bird's speed immediately after swallowing

         Bird's speed immediately after swallowing = 4.52 m/s

The speed of the bird immediately after swallowing, measured by an observer on the ground, is 4.52 m/s.

Momentum of a object is the force of speed of it in motion. Momentum of a moving body is the product of mass times velocity.

When the two objects collides, then the initial collision of the two body is equal to the final collision of two bodies by the law of conservation of momentum.

A 300 g bird flying along at 5.5 m/s sees a 10g insect heading straight toward it with a speed of 25 m/s (as measured by an observer on the ground, not by the bird).

Let suppose the bird's speed immediately after swallowing is v' m/s. Thus, by the conservation of momentum,

[tex](m_1v_1)+(m_2v_2)=(m_1+m_2)v'[/tex]

Put the values,

[tex](0.3\times5.5)+(0.01\times(-25))=(0.3+0.01)v'\\v'=4.52\rm\; m/s[/tex]

Thus, the speed of the bird immediately after swallowing, measured by an observer on the ground, is 4.52 m/s.

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Answer:

10 m/s

Explanation:

mass, M = 2000 kg

Power, P = 100 kW = 100000 W

inclination, θ = 30°

g = 10 m/s^2

Let the velocity is v.

P = F x v

where, F is force and v be the velocity

100000 = mg Sin 30 x v

100000 = 2000 x 10 x 0.5 x v

v = 10 m/s

Thus, the speed is 10 m/s.

Answer:

24.07415 rpm

Explanation:

[tex]\mu[/tex] = Coefficient of friction = 0.63

v = Velocity

d = Diameter = 4.9 m

r = Radius = [tex]\frac{d}{2}=\frac{4.9}{2}=2.45\ m[/tex]

m = Mass

g = Acceleration due to gravity = 9.81 m/s²

Here the frictional force balances the rider's weight

[tex]f=\mu F_n[/tex]

The centripetal force balances the weight of the person

[tex]\mu m\frac{v^2}{r}=mg\\\Rightarrow \mu \frac{v^2}{r}=g\\\Rightarrow v=\sqrt{\frac{gr}{\mu}}\\\Rightarrow v=\sqrt{\frac{9.81\times 2.45}{0.63}}\\\Rightarrow v=6.17656\ m/s[/tex]

Velocity is given by

[tex]v=\omega r\\\Rightarrow \omega=\frac{v}{r}\\\Rightarrow \omega=\frac{6.17656}{2.45}\\\Rightarrow \omega=2.52104\ rad/s[/tex]

Converting to rpm

[tex]2.52104\times \frac{60}{2\pi}=24.07415\ rpm[/tex]

The minimum angular speed for which the ride is safe is 24.07415 rpm

The minimum angular speed for which the ride will be safe is ≈ 24.07 rpm

Given data :

Diameter of hollow steel cylinder = 4.9 m.   Radius ( r ) = 4.9 / 2 = 2.45 m

coefficient of friction of clothing ( [tex]\alpha[/tex] ) = 0.63

g = 9.81 m/s²

First step : Determine the velocity using the centripetal forces relation

v = [tex]\sqrt{\frac{g*r}{\alpha } }[/tex] ----- ( 1 )

where ;  g = 9.81 m/s,  r = 2.45 m ,  [tex]\alpha = 0.63[/tex]

Insert values into equation 1

V = [√( 9.81 * 2.45 )/0.63 ]

   = 6.177 m/s

Next : convert velocity to rad/sec ( angular velocity )

V = ω*r

∴ ω = V / r

       = 6.177 / 2.45 = 2.52 rad/sec

Final step:  The minimum angular speed expressed in rpm

angular velocity ( ω ) * [tex]\frac{60}{2\pi }[/tex]

= 2.52 * [tex]\frac{60}{2\pi }[/tex]  ≈ 24.07 rpm

Hence the minimum angular speed in rpm = 24.07 rpm.

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Answer:

259.62521 seconds

Explanation:

[tex]m_1[/tex] = Mass of astronaut = 87 kg

[tex]m_2[/tex] = Mass of wrench = 0.57 kg

[tex]v_1[/tex] = Velocity of astronaut

[tex]v_2[/tex] = Velocity of wrench = 22.4 m/s

Here, the linear momentum is conserved

[tex]m_1v_1=m_2v_2\\\Rightarrow v_1=\frac{m_2v_2}{m_1}\\\Rightarrow v_1=\frac{0.57\times 22.4}{87}\\\Rightarrow v_1=0.14675\ m/s[/tex]

Time = Distance / Speed

[tex]Time=\frac{38.1}{0.14675}=259.62521\ s[/tex]

The time taken to reach the ship is 259.62521 seconds

Answer:

x = 2000 Km

Explanation:

Given

y = 10 km

Slope: 1 : 200

x = ?

We can apply the formula

y / x = 1 / 200   ⇒     x = 200*y = 200*10 Km

⇒     x = 2000 Km

Given the slope ratio of 1:200 for a warm front and an observed cloud height of 10 km, the warm front is around 2000 km away.

In meteorological terms, a warm front slope can be visualized as a ramp, approximating a 1:200 ratio in this case, where the height (vertical change) is comparable to the 'rise' and the horizontal distance (or reach) is comparable to the 'run'. Here, you mentioned cirrus clouds at an approximate altitude of 10 kilometers - this is the vertical elevation or 'rise'. The slope ratio 1:200 is a simplification indicating that for every 1 km rise, the front extends 200 km in the horizontal direction or the 'run'.

So, if the 'rise' is 10 km (the altitude at which you observe the cirrus clouds), we can calculate the 'run' by multiplying the 'rise' by the slope ratio (200). Thus, the approaching warm front is approximately 10 km * 200 = 2000 km away.

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Answer:

785.398 W

444.5698 m

Explanation:

I = Intensity of sound

r = Distance

The intensity of sound is given by

[tex]\beta=10log\frac{I}{I_0}\\\Rightarrow 130=10log\frac{I}{10^{-12}}\\\Rightarrow 13=log\frac{I}{10^{-12}}\\\Rightarrow 10^{13}=\frac{I}{10^{-12}}\\\Rightarrow I=10^{-12}\times 10^{13}\\\Rightarrow I=10\ W/m^2[/tex]

Power

[tex]P=IA\\\Rightarrow P=I4\pi r^2\\\Rightarrow P=10\times 4\pi\times 2.5^2\\\Rightarrow P=785.398\ W[/tex]

The power output of the speaker is 785.398 W

If [tex]\beta=85\ db[/tex]

[tex]\beta=10log\frac{I}{I_0}\\\Rightarrow 85=10log\frac{I}{10^{-12}}\\\Rightarrow 8.5=log\frac{I}{10^{-12}}\\\Rightarrow 10^{8.5}=\frac{I}{10^{-12}}\\\Rightarrow I=10^{-12}\times 10^{8.5}\\\Rightarrow I=10^{-3.5}\ W/m^2[/tex]

[tex]P=IA\\\Rightarrow P=I4\pi r^2\\\Rightarrow r=\sqrt{\frac{P}{I4\pi}}\\\Rightarrow r=\sqrt{\frac{785.398}{10^{-3.5}\times 4\pi}}\\\Rightarrow r=444.5698\ m[/tex]

The distance would be 444.5698 m

To calculate the power output of the speaker, we can convert the sound level from decibels to intensity and then use the formula for spherical spreading of sound. To find the distance where the sound level is 85 dB, we can use the same formula and solve for the distance.

To calculate the power output of the speaker, we first need to convert the sound level from decibels to intensity. We can use the formula I = Io * 10^(B/10), where I is the intensity, Io is a reference intensity, and B is the sound level in decibels. With Io = 10^-12 W/m² and B = 130 dB, we can find I. Since the sound spreads in a sphere, we can use the formula I = P / (4πr²), where P is the power output of the speaker and r is the distance. We know I and r, so we can solve for P.

Using the same formula, we can find the distance r where the sound level is 85 dB. We are given the intensity I and the sound level B, so we can solve for r using the formula r = sqrt(P / (4πI)).

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Answer:2155 J

Explanation:

Given

Change in Internal energy [tex]\Delta U=-1477 J[/tex] i.e. decrease in Internal Energy

Heat added to system [tex]Q=678 J[/tex]

According First law for a system

[tex]dQ=dU+dW[/tex]

[tex]678=-1477+dW[/tex]

[tex]dW=2155 J[/tex]

Thus 2155 J of work is done by system                      

Answer: 16.9cm/s

Explanation:

According to the principle of conservation of linear momentum which states that the sum of momentum of bodies before collision is equal to the sum of their momentum after collision.

Momentum = mass × velocity of the body

Let m1 be mass of the first body= 12g

m2 be mass of the second body= 29cm/s

v1 be velocity of the first body= 24g

v2 be velocity of the second body= 14cm/s.

Note that both objects will move with a common velocity (v) after collision. Using the formula

m1v1 + m2v2 = m1v +m2v

12(24) + 29(14) = (12+29)v

288+406 = 41v

694 = 41v

v = 694/41

v = 16.9cm/s

To find the velocity of the slower object after the elastic collision, we can use the conservation of momentum and kinetic energy equations. By plugging in the given values and solving the system of equations, we can determine the final velocities of both objects.

In an elastic collision, the total momentum of the system is conserved. To find the velocity of the slower object after the collision, we can use the equation:

mass₁ × velocity₁ + mass₂ × velocity₂ = mass₁ × final_velocity₁ + mass₂ × final_velocity₂

Plugging in the values, we have:

12g × 29 cm/s + 24g × 14 cm/s = 12g × final_velocity₁ + 24g × final_velocity₂

Converting the masses to kg, and solving for final_velocity₂:

0.012 kg × (29 cm/s) + 0.024 kg × (14 cm/s) = 0.012 kg × (final_velocity₁) + 0.024 kg × (final_velocity₂)

0.348 kg cm/s + 0.336 kg cm/s = 0.012 kg × final_velocity₁ + 0.024 kg × final_velocity₂

0.684 kg cm/s = 0.012 kg × final_velocity₁ + 0.024 kg × final_velocity₂

Since the collision is elastic, the total kinetic energy of the system is conserved. This means that the final kinetic energy of the system is equal to the initial kinetic energy.

Using the formula for kinetic energy:

(1/2) × mass₁ × (velocity₁)² + (1/2) × mass₂ × (velocity₂)² = (1/2) × mass₁ × (final_velocity₁)² + (1/2) × mass₂ × (final_velocity₂)²

Plugging in the values:

(1/2) × 0.012 kg × (29 cm/s)² + (1/2) × 0.024 kg × (14 cm/s)² = (1/2) × 0.012 kg × (final_velocity₁)² + (1/2) × 0.024 kg × (final_velocity₂)²

0.012 kg cm²/s² + 0.024 kg cm²/s² = 0.012 kg × (final_velocity₁)² + 0.024 kg × (final_velocity₂)²

0.036 kg cm²/s² + 0.336 kg cm²/s² = 0.012 kg × (final_velocity₁)² + 0.024 kg × (final_velocity₂)²

0.372 kg cm²/s² = 0.012 kg × (final_velocity₁)² + 0.024 kg × (final_velocity₂)²

We now have a system of two equations with two unknowns. Solving this system will give us the final velocities of both objects after the collision.

Answer:

[tex]\rho=4.02\times 10^{-8}\ \Omega-m[/tex]

Explanation:

Let us assume that the radius of the wire, r = 0.8 mm = 0.0008 m

EMF of the battery, V = 12 V

Slope of I versus 1/d, m = 600 A-m

The resistance of any material is given by :

[tex]R=\rho \dfrac{d}{A}[/tex]

d is the length of wire

Since, [tex]I=\dfrac{V}{R}[/tex]

[tex]I=\dfrac{VA}{\rho d}[/tex]

[tex]I=\dfrac{VA}{\rho}.(\dfrac{1}{d})[/tex]

[tex]y=slope\times x[/tex]

[tex]\dfrac{VA}{\rho}=600[/tex]

[tex]\rho=\dfrac{VA}{600}[/tex]

[tex]\rho=\dfrac{12\times \pi \times (0.0008)^2}{600}[/tex]

[tex]\rho=4.02\times 10^{-8}\ \Omega-m[/tex]

So, the resistivity of the material of which the wire is made is [tex]4.02\times 10^{-8}\ \Omega-m[/tex].

The slope of the I vs. 1/d graph represents the resistivity of the wire's material. The given slope is 600 A*m, therefore, the resistivity of the material this wire is made of is 600 Ω*m.

The slope of the I vs. 1/d graph is equal to the resistivity of the material the wire is made of. In this case, the slope is given as 600 A*m, so this means the resistivity of the material the wire is made of is 600 Ω*m. This is derived from Ohm's law V=IR which when arranged as I = V/R, indicates that the slope of the graph is the resistance. Since, the resistance R of a cylindrical conductor is directly related to the resistivity (ρ) of the material as R = ρL/A, where L is the length and A is the cross-sectional area, the slope is a representation of this relationship hence representing resistivity.

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Answer:

[tex]0.57 ms^{-1}[/tex]

Explanation:

k = spring constant of the spring = 40 Nm⁻¹

A = amplitude of the simple harmonic motion = 4 cm = 0.04 m

m = mass of the block attached to spring = 0.20 kg

w = angular frequency of the simple harmonic motion

Angular frequency of the simple harmonic motion is given as [tex]w = \sqrt{\frac{k}{m} } \\w = \sqrt{\frac{40}{0.20} }\\w = 14.14 rads^{-1}[/tex]

[tex]v[/tex] = Speed of the block as it pass the equilibrium point

Speed of the block as it pass the equilibrium point is given as

[tex]v = A w\\v = (0.04) (14.14)\\v = 0.57 ms^{-1}[/tex]

Final answer:

The speed of a 0.20-kg block attached to a spring and released from a displacement of 4.0 cm on a frictionless surface is calculated to be 0.4 m/s when it passes through the equilibrium point, using conservation of mechanical energy.

Explanation:

The question involves calculating the speed of a block when it passes through the equilibrium point after being released from a displacement in a setup involving harmonic motion. In this case, we use the principle of conservation of mechanical energy. The total mechanical energy in a system, including potential and kinetic energy, remains constant if only conservative forces are doing work. Since the surface is frictionless and the only force doing work is conservative (spring force), the potential energy stored in the spring when the block is displaced is fully converted into kinetic energy when the block passes through the equilibrium position.

The potential energy stored in the spring at the maximum displacement is given by ½*k*x², where k is the spring constant (40 N/m) and x is the displacement (0.04 m). Thus, PE = 0.5 * 40 * (0.04)² = 0.032 J. At the equilibrium point, all this potential energy is converted into kinetic energy (KE = 0.5 * m * v²), allowing us to solve for v (speed). Rearranging KE = PE gives v = [tex]\sqrt{(2*PE/m)[/tex]. Plugging in the values, v = [tex]\sqrt{2*0.032/0.20[/tex] = 0.4 m/s.

This Physics problem involves two parts using Newton's law of gravitation. For part (a) calculate the gravitational force between the 32 kg object and each of the other objects, and then find the net force. For part (b), set the forces as equal and solve for the appropriate distance, considering the force direction.

To solve these particular physics problems, which are based on Newton's law of gravitation, the following formula can be used: F = G* (m1*m2)/ r^2, where F stands for force, G is the gravitational constant (approximately 6.67 x 10^-11 N(m/kg)^2), m1 and m2 are masses of the objects and r is the distance between them.

For part (a) of the question, we need to calculate the gravitational force between the 32 kg object and each of the other objects, and then find the net force. And for part (b), we set the forces as equal and solve for the appropriate distance.

Remember, it is important to take into account the direction of the force. The two larger weights will each exert a force on the 32 kg weight that tries to pull it towards them. That means that if you measure distance from one of the larger weights, the forces exerted by it will be positive, and the forces from the other weight will be negative.

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Answer:

Goodness of fit

Explanation:

The word "goodness of fit" is characterized as the concept that growth depends on the level of correlation between the personality of children as well as the existence and needs of the community where they were born.

Goodness of fit, used in psychology as well as in parenting, defines a person's personality alignment with the characteristics of their specific social culture.

There are various features and requirements in all contexts, i.e. community, culture, workplace, etc. Goodness of Fit is very crucial component of any individual's psychological change.

Answer:

3 x 10^18 kg

Explanation:

Time period, T = 3 days = 86400 x 3 = 259200 seconds

r = 7 x 10^5 m

Let M be the mass of planet

Use the formula of time period of satellite

[tex]T = 2\pi \sqrt{\frac{r}{GM}}[/tex]

Where, G be the universal gravitational constant.

[tex]M=\frac{4\pi ^{2}r^{3}}{GT^{2}}[/tex]

By substituting the values

[tex]M=\frac{4\times 3.14 \times 3.14\times \left ( 7\times 10^{5} \right )^{3}}{6.67\times 10^{-11}\times 259200\times 259200}[/tex]

M = 3 x 10^18 kg

Thus , the mass of planet is 3 x 10^18 kg.