You are pushing a 30 kg wooden crate across the floor. The force of sliding friction on the crate is 90 N. How much force must you exert on the crate to keep it moving with a constant velocity

The net acceleration working on the rock is 56.9 m/s² in upward direction, if the mass of the rock is 7.45 kg and the force applied on it is 497 N.

The upward force applied on the rock, F = 497 N

Mass of the rock, M = 7.45 kg

Acceleration due to gravity, g = 9.81 m/s²

We know force = Mass × Acceleration

Acceleration produced in the rock due to the force applied, a = 497/7.45

= 66.71 m/s²

Acceleration due to gravity is working downward, so net acceleration working on the rock, = 66.71 - 9.81 = 56.9 m/s²

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In a downward direction, the magnitude of the acceleration is negative and velocity is zero.

Here,

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The net force applied by to the box is 6264.2 N, if the mass of the box is 50.0 kg and it comes to rest in 0.05 second.

Free fall height of the box, h = 2.0 m

Free fall velocity of the box just before touching the ground, v = √(2gh)

= √(2×9.81×2) = 6.264 m/s

Final velocity or the box after 0.05 sec, = 0

Time to stop, t = 0.05 sec

We know that the applied force is equal to the rate of change of momentum.

F = m(v-u)/t

F = 50 × (6.264-0)/0.05 = 6264.2

So, F = 6264.2 N

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The work done by the man in lifting his body is 493.92J.

What is work done?

When an object is moved over a specific distance by an external force, the quantity of energy transferred to it is called work. The quantity of energy transmitted to an object through work is referred to as the work done on the thing. Since the man raises his body a vertical distance of 0.63m to go from stage 1 to stage 2 he is doing work against gravity. So, the work done in this case is given by W=mgh where m is the mass of the body, g is the acceleration due to gravity and h is the height raised by the body.

Now, according to the question

Mass of the man=80Kg

Height raised by the man=0.63m

Acceleration due to gravity=9.8

On substituting the values in the given formula, we get the work done as

W=80×9.8×0.63

W=493.92J

Therefore, the work done by the man is 493.92J.

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The new angular speed of the merry go round after the man came to the point 0m on the merry go round will be 1.37 rev/s.

The merry go round is rotating at the speed of 0.27 rev/s with a man of mass 85 kg on it at a pint of 2.2 m form he center of the axis of rotation.

We have to find the new speed of the merry go round when the person walk to the center of the circle.

The mass and radius of the merry go round are given to be 67 kg and 2.2m.

Using the conservation of momentum as the system is not under any external force,

Initial momentum = final momentum

I₁W₁ = I₂W₂

I₁ and W₁ are initial moment of inertia and angular speed, I₁ and W₁ are final moment of inertia and angular speed.

Putting values,

(85+67)(2.2)₂0.27 = (67)W₂

1.34 rev/s = W₂

So, the final angular speed is 1.34 rev/s.

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The b-k colour of a galaxy is a measure of the difference in brightness between the galaxy at blue (b) wavelengths and infrared (k) wavelengths. If the luminosity of the galaxy at blue wavelengths rises by a factor of 100, without any change in the luminosity at k wavelengths, the new b-k colour will be different.

We can use the following equation to calculate the new b-k colour:

b-k = -2.5 * log(Lb/Lk)

Where Lb and Lk are the luminosity of the galaxy at blue and infrared wavelengths, respectively.

Given that the luminosity at blue wavelengths has increased by a factor of 100 and the luminosity at k wavelengths has remained unchanged, the new b-k colour can be calculated as:

b-k = -2.5 * log(100*Lb/Lk) = -2.5 * log(100) + b-k = -2.5 * 2 + 3.2 = -0.8 + 3.2 = 2.4

Therefore, the new b-k colour of the galaxy is 2.4 magnitudes.

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The compression in the spring will be 4.9m

What is spring force?

The force needed to compress or extend a spring attached to an object is known as the spring force. A spring exerts an equal and opposite force on a body when the object exerts a force on it. It always acts to bring mass back to its equilibrium. Spring force exerted by the spring on the body is given by = where k is the spring constant of the spring x is the compression or extension caused in the spring. To find the x we can use this formula.

Now, according to the question we have

Spring constant=2000N/m

Mass attached to the spring=1000Kg

On substituting the values in the above formula, we get the compression as

F=kx

mg=kx

1000×9.8=2000×x

x=4.9m

Therefore, the compression in the spring is 4.9m

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He travels a distance of 300 m in that time interval.

We know that we can be able to obtain the time that he travelled if we use the formula that applies to the average speed. In this case we are told in  a time of 30 seconds, he increases his speed steadily from 8.3 m/s to 11.7 m/s.

Thus;

distance = Average speed/Time

Distance = (8.3 + 11.7/2) * 30

Distance = 300 m

We can see that he would move through a distance of well about 300m as the velocity is increasing as shown here.

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The magnitude of resultant force of the two forces (40 N and 30 N) at right angles is 50 N.  

The Pythagorean theorem is used to calculate the consequence of two forces acting at right angles to one another. According to the Pythagorean theorem, the square of the hypotenuse, the longest side opposite the right angle, in a right triangle, equals the sum of the squares of the other two sides. (the two shorter sides).

In this instance, the two forces combine to form the triangle's two shorter sides, with the hypotenuse as the third force.

Therefore, the amount of the resulting force can be determined as follows:

⇒ √(40² + 30²) = √(1600 + 900) = √2500 = 50 N

Hence, the magnitude of the resultant force of the two forces (40 N and 30 N) at right angles is 50 N.

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The radius of a planet is 7.01 times of earth's. The volume of the planet is 344.47 times bigger than the volume of earth.

Let's assume that the shape of both planets are perfect spheres. The volume of a sphere is given by:

V = 4/3 πr³

Where r is the radius.

Hence, the volume is directly proportional to r³, or:

V ∝ r³

Let:

r_p = radius of the planet

r_e = radius of earth

Then,

r_p = 7.01 r_e

Using direct proportionality:

V_p : V_e = r³_p :  r³_e

V_p : V_e = (7.01 r_e)³ :  r³_e

V_p : V_e = 344.47 : 1

V_p = 344.47 V_e

Therefore, the volume of the planet is 344.47 times bigger than earth's.

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Iron production was mastered by Zhou craftsmen.

The Zhou dynasty was one of the greatest in Chinese history, and among its many achievements were the artisans who discovered how to make iron. Iron became a common material for agricultural equipment, which was revolutionary for the Chinese people and extremely beneficial for agriculture. Everything became lot easier, quicker, and more efficient as a result.

The Zhou dynasty, which followed the Shang dynasty, was the longest to rule China.

Artisans are individuals who create handicrafts.

Agriculture, education, military planning, Chinese literature, music, philosophical schools of thought, social stratification, as well as political and religious advancements, all benefited from the Zhou Dynasty's considerable cultural contributions.

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To control a camera on the moon to perfectly follow the lunar lander as it descended from the surface, engineers used a combination of tracking systems and software.

First, they used a tracking camera to monitor the descent of the lander. This camera was mounted in a fixed position, and was able to track the movement of the lander in real-time.

Additionally, engineers used software to calculate the exact trajectory of the lander and to calculate the corresponding camera movements. This allowed the camera to perfectly follow the lunar lander as it descended from the surface.

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At the height of 3h/4 meter, the velocity of the baseball will be half of its original velocity v, if it reaches a maximum height h.

Maximum height reached by the baseball, = h

The velocity of the ball at maximum height v₁ = 0

Initial velocity, = v

by the 3rd equation of motion, v₁² = v² - 2gh

0 = v² - 2gh

v² = 2gh

Now let the height at which the velocity will be half of the original velocity = h₁

Then by the 3rd equation of motion,

(v/2)² = v² - 2gh₁

2gh₁ = v² - v²/4 = 3v²/4

h₁ = 3v²/8g

We know v² = 2gh, So

h₁ = 3(2gh)/8g = 3h/4 m.

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The potential difference between the plates is 2156V Plate B has the higher potential because the electron moves from A to B as it acquire its own kinetic energy.

Given kinetic energy of electron (KE) = 3.45×10^−16 J

The electron is accelerated from plate A to plate B by an electric field.

We know kinetic energy = charge of electron x potential difference.

So, KE = -qV where q = 1.6 x 10^-19C which is charge of electron.

-3.45×10^−16 = -1.6 x 10^-19 x V

V = 3.45×10^−16/1.6 x 10^-19 =  2156V

Sine the potential difference is positive we can say that plate B has higher potential that plate A.

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In warm air, sound travels more quickly than in cold air. Since the speed of sound is directly inversely proportional to the square root of the air's absolute temperature, the speed of sound rises with temperature.

Additionally, dry air travels faster than humid air for sound. The speed of sound is slightly affected by humidity, with sound traveling slightly slower in more humid air. This is due to the fact that airborne water vapor has the ability to slow down sound waves by absorbing some of their energy.

The amount of water vapor in the air is measured by humidity. At a given temperature, it is typically expressed as a percentage of the maximum amount of water vapor that the air can hold.

It is said that the air has a humidity of 100 percent when it is saturated. Any additional water vapor will condense into liquid or solid form (such as dew, fog, clouds, or precipitation) because the air cannot hold any more water vapor at this point. The air can hold more water vapor and is less likely to reach 100% humidity as the temperature rises.

Specific humidity or mixing ratio, which is the ratio of the mass of water vapor in the air to the mass of the air as a whole, is another way to measure humidity.

The weather and climate can be significantly affected by humidity. High humidity can cause clouds to form and precipitation to fall. It can also make the air feel hotter. Low humidity can make the air feel cooler, make it dry, and make wildfires more likely. The human body is also affected by humidity; low humidity can dry out the skin and nasal passages, while high humidity can make it difficult to cool down and can exacerbate respiratory issues.

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The magnitude of the charge with a smaller magnitude is 2.42 × 10⁴ Coulomb. The result is obtained by using the formula for electrostatic force.

The formula for electrostatic force is

F = kq₁q₂/r²

Where

Two point charges are separated.

We have

Find  the smaller magnitude of the charge!

The smaller magnitude of the charge is q₂.

We use the formula above to find q₂.

F = kq₁q₂/r²

85 = (9×10⁹)2q₂q₂/(0.6)²

85 = (18×10⁹)q₂²/0.36

q₂² = (18×10⁹)/(85×0.36)

q₂² = (18×10⁹)/30.6

q₂² = 5.88 × 10⁸

q₂ = √(5.88 × 10⁸)

q₂ = 2.42 × 10⁴ Coulomb

Hence, the smaller magnitude of the charge is 2.42 × 10⁴ Coulomb.

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The equator is characterized by relatively  low atmospheric pressure aloft.

The equator is a large circle that surrounds Earth and sits on a plane perpendicular to its axis, everywhere being equally far from the geographic poles.

This geographic, or terrestrial, Equator separates Earth's Northern and Southern hemispheres and serves as the fictitious reference line on the planet's surface from which latitude is calculated; in other words, it is the line at latitude 0°.

In hotter equatorial regions, the air above expands, gets less dense, and rises. At this latitude, this causes a low pressure band to form.

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The height the ball reaches when the boy throws the ball up in the air is 12.6m.

Given the maximum horizontal distance a boy can throw a ball (s) = 50m

The initial speed of the ball = um/s

The maximum height reached = ym

The motion in vertical direction is given as:

y = ut1 + 1/2at1^2 where v is the speed in vertical direction and a is the acceleration and t1 is the time taken to travel upward distance.

s = 0 + gt^2/2 then t = √2s/g = √2 x 50/9.8 = 3.18s

We know that as the velocity is same at any point in distance travelled distance = speed x time = 50m

So t1 = t/2 as it covers half time when reached maximum height.

The velocity (v) = gt = 9.8 x 3.18 = 31.164m/s

The maximum height reached (y) = vt1 +  1/2gt1^2 where t1 - t/2

y = vt/2 + 1/2g(t/2)^2

y = 50/2 + 1/2(9.8)(3.18/2)^2

y = 12.6m

Hence the maximum height the ball can be thrown is 12.6m.

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The minimum number of degrees  is  108°.

Based on the accompanying figure,

The angle of rotation from point A to point B is the smallest angle at which the star can overlap itself.

Let a° be the angle formed by A and B.

By connecting the star's vertices, we can form a pentagon.

The formula to calculate a polygon's internal angle is

The internal angle measurement is

=> 180 x (n-2)/n

=> 180 x (5-2)/5

=> 180 x 3/5

=> 36

ABC measured as:

= 108°

Since the inner angle is divided into three equal parts by a side star,

36° is the internal angle measurement.

the AOB,

The sum of a triangle's inner angles is 180 degrees, or m(OAB) + m(AOB) + m(ABO).

36° + a + 36° = 180°

a + 72° = 180°

a = 180 - 72

a = 108°

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The full question is :

What is the minimum angle of rotation (in degrees) that will carry the star onto itself?

The ability to do activities for more than a few minutes is called aerobic ability.

Endurance is the ability to maintain an activity for extended periods of time and usually refers to aerobic ability. For example, children can play actively for hours. We need this ability to perform repetitive activities of daily living, such as stirring food while cooking, using a hair dryer to dry our hair, or walking up steps.

Recreational and job-related activity also often require a high level of endurance. Local muscle endurance is best defined as the ability to resist muscular fatigue and demonstrate how a given type of contraction can be sustained, typically measured in terms of the number of repetitions.

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Therefore, the highest fluid index of refraction at which we can still produce entire internal reflection is 1.34.

A wave bends when it reaches a medium with a different speed, which is known as refraction. When light travels through a slow medium after traveling through a fast medium, the light ray is bent in the direction of the boundary between the two media.

When light travels from one material to another and changes direction or bends, this is known as refraction. When light strikes water, for instance, it refracts after passing through the air. This may cause a straw in a glass of water to seem twisted at the surface.

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The net charge on the pith ball in coulombs when the number of electrons is specified is calculated to be 2.96 × 10⁻² C.

Given that, number of electrons = 1.85 × 10¹⁷

We know the charge on electron as, e = 1.6 × 10⁻¹⁹ C

The relation between charge and number of electrons is known to be,

Q = n e

where, Q is charge

n is number of electrons

e is charge on electron

After putting the values into the equation above, we have,

Q = 1.85 × 10¹⁷ × 1.6 × 10⁻¹⁹ = 2.96 × 10⁻² C

Thus, the net charge is calculated to be 2.96 × 10⁻² C.

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If the string is at the breaking point at the bottom of the circle, then the speed of the object at this point is 7.82m/s.

The force transferred through a rope, string, or wire when pushed by forces acting from opposite sides is referred to as tension. The tension force is applied along the entire length of the wire and exerts an equal amount of strain on the bodies at each end. Every physical object that comes into contact with another one applies some sort of force.

At the bottom of the circle,

Let the maximum speed will be V.

It is given when the string breaks its tension exceeds 22.5N

it means, T=22.5N

now, we know,

In a Circular path,

⇒ [tex]\frac{mV^2}{r} = T-mg[/tex]

⇒ [tex]V^{2}=\frac{r}{m}(T-mg)[/tex]

⇒ [tex]V^{2}=r(\frac{T}{m} -g)[/tex]

⇒ [tex]V=\sqrt{r(\frac{T}{m} -g)}[/tex]

According to the question,

m = 0.275KG, r = 0.850m and T = 22.5N

Putting the values, We get,

⇒ [tex]V=\sqrt{(0.850)(\frac{22.5}{0.275}-9.80 )}[/tex]

⇒ [tex]V=7.82m/s[/tex]

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The complete question is:

A 0.275 Kg ball wings in a vertical circular path on a string L=0.850m long. If the string breaks when its tension exceeds 22.5N, what is the maximum speed the ball can have at the bottom before that happens?

The estimated temperature in the stellar atmosphere is T = 4.48 / 8.62 x 10^-5 * ln([H2]/4) .

To estimate the temperature of a stellar atmosphere consisting almost entirely of hydrogen, we can use the concept of dissociation equilibrium. When a gas is in equilibrium, the rate of formation of molecules from atoms is equal to the rate of dissociation of molecules into atoms. The dissociation equilibrium constant (Kd) is given by the ratio of the concentration of atoms to the concentration of molecules, at a given temperature and pressure.

In this case, it is given that 50% of the hydrogen molecules are dissociated into atoms, so the concentration of atoms is half the concentration of molecules. The pressure is also given as 100 Pa.

The dissociation equilibrium constant (Kd) can be calculated using the following equation:

Kd = [H]^2 / [H2]

Where [H] is the concentration of atomic hydrogen and [H2] is the concentration of molecular hydrogen.

The equilibrium constant can also be related to the binding energy of the hydrogen molecule (E) and the temperature (T) using the following equation:

Kd = e^(-E/kT)

Where k is the Boltzmann constant.

By combining the above two equations:

[H]^2 / [H2] = e^(-E/kT)

And since we know that [H] = [H2]/2

[H2]/4 = e^(-E/kT)

Now we can solve for T:

T = -E/k * ln([H2]/4)

Given that the binding energy of hydrogen molecule is 4.48 eV and k = 8.62 x 10^-5 eV/K.

T = 4.48 / 8.62 x 10^-5 * ln([H2]/4)

The pressure is not used in the above calculation. The temperature is related to the binding energy and the dissociation equilibrium constant which is dependent on the concentration of the hydrogen molecules and atoms.

It is important to note that the above calculation is a rough estimate and the temperature of a stellar atmosphere can be affected by many other factors such as radiation, convection, and other chemical reactions.

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The velocity of the jet is calculated to be 900 miles/hr when the relation between velocities of both propeller and the jet is given.

The distance travelled by a propeller plane and a jet = 3000 miles

Velocity of the plane Vp = 1/3 Velocity of the jet Vj

Vp = 1/3 Vj

Vj = 3 Vp ----(1)

Time taken by the propeller plane to complete the trip = 10 hours

Velocity of the propeller plane = Distance of the propeller plane/Time

⇒ 3000/10 = 300 miles/hr

The velocity of the jet = 3 times the velocity of the propeller plane

⇒ 3 × 300 miles/hr = 900 miles/hr

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Imagine the same bouncing basketball as it is moving down, it is having a negative acceleration, as it is moving down.

This is because acceleration is defined as the rate of change of velocity, and negative acceleration occurs when an object's velocity is decreasing. The basketball is moving down, it is losing height, and its velocity is decreasing, thus it has a negative acceleration. To be more precise, the negative acceleration of the basketball is due to the force of gravity acting upon it, which is pulling it down toward the earth. The force of gravity is a constant force, acting downward, and it causes all objects to accelerate downward at a rate of 9.8 m/s^2 (on the surface of the earth). ​

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The bullet goes up to the height of 1074.6 m, and its initial velocity was 145.2 m/s,  If the bullet takes 14.8 sec to reach its peak.

Time taken by the bullet to reach its peak, t = 14.8 sec

Velocity after 14.8 sec, v = 0

Let the initial velocity, = u

Acceleration working on the bullet, a = -g = -9.81 m/s²

By the first equation of motion,

v = u + at

0 = u - 9.81 × 14.8

u = 145.2 m/s

Let the highest peak reach by the bullet is h meter, then by using the second equation of motion,

h = ut + 0.5at²

h = (145.2 × 14.8) + 0.5(-9.81)(14.8)²

h = 1074.6 m

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The charge on the sphere is found to be 1.5 x 10⁻¹⁵ C.

The proton is orbiting the surface of the charged sphere of radius 4.43 cm and the speed of the proton is 3.22 x 10⁵m/s. The charge on proton is 1.6 x 10⁻¹⁹ C and the mass of the proton is 1.67 x 10⁻²⁷ kg.

Now,

For revolving,

Electrostatic forces = Centripetal force

KQq/r² = Mv²/r

Here,

R is the radius of the orbit,

Q and q are the charges of the sphere and the proton,

M is the mass of the proton.

Putting values,

9 x 10⁹ x Q x 1.6 x 10⁻¹⁹/0.0443 = 1.67 x 10⁻²⁷ x 3.22 x 10⁵

Q = 1.5 x 10⁻¹⁵ C

So, the charge on the sphere is 1.5 x 10⁻¹⁵ C.

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The beam scenario with a 7cm sector size and a scanning rate of 13cm will have better resolution.

This is because the more modest sector size considers a more engaged beam, and the faster scanning rate takes into account more information to be gathered in a more limited measure of time. This results in a higher-resolution image.

In the first scenario, the temporal resolution is 10cm sector size and scanning at 18cm. In this scenario, the sector size is 10cm, which means that the beam is 10cm wide.

The scanning rate is 18cm per second, which means that the beam scans 18cm in one second. The slower scanning rate in this scenario will result in a lower temporal resolution because less data are being collected in the same amount of time.

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The energy of the first sound is 6.81 times bigger than the energy of the second sound, or 6.81 times stronger than the intensity of another sound.

Its intensity is the term used to describe how loud a sound is to an individual. Loudness cannot be quantified objectively since everyone perceives loudness differently. Following is a description of the relative characteristics of the acoustic signal, audio intensity, and sound intensity. The kinetic energy of the mass of air is created by the combination of the source's increasing amplitude and the vibrating surface.

The formula for sound intensity is acoustic power divided by the normal area to the propagation direction.

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