the side wall of a dam with width 70 m is a quarter circle with radius of 7 m. when the dam is full, calculate the hydrostatic force on the dam in n and its line of action.

For a observer at a middle latitude, the time between when a star rises and when it sets depends on the star.

If you watch the night sky for a few hours, you will see that the stars appear to rotate about a fixed point in the sky (which happens to be near the pole star, Polaris). This motion is due to the Earth's rotation. As the spin of the Earth carries us eastward at almost one thousand miles per hour, we see stars rising in the East, passing overhead, and setting in the West.

Because of the Earth's rotation, everything in the sky seems to move together, turning once around us every 24 hours. Ancient astronomers explained this phenomenon by supposing that the Sun, Moon, planets, and stars were attached to a huge celestial sphere, centered on the Earth, which rotated on a fixed axis once per day.

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--The complete question is, An observer at a middle latitude (i.e. neither at the equator nor the poles), how much time is there between when a star rises and when it sets?

a. <12 hours

b. about 12 hours

c. > 12 hours

d. depends on the stars--

The two trains' aggregate mechanical speed is 30 + 40, or 70 miles per hour. Therefore, they must be 70 miles apart when they meet one hour prior (in the final 1 hour they will cover 70 miles to meet).

After meeting, the trains' crossing time is calculated as (L1+ L2)/(S1+ S2). The sum of the train lengths and speeds in this case represents the overall distance to be traveled.

The faster one must pass the slower one entirely in 60 seconds while they are both traveling in the same direction. They totally pass each other in 10 seconds if they are traveling in the opposite directions.

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80%  is the appliance's efficiency

Why do appliances use less energy?

Among the several advantages of energy efficiency are: Environmental: Greater efficiency can reduce water use, greenhouse gas (GHG) emissions, and other pollutants. Economic benefits of energy efficiency improvements include reduced utility costs, job growth, and reduced price fluctuation of power.

Utilizing the formula below, efficiency may be represented as a ratio: Output ÷ Input. The total amount of beneficial work accomplished, excluding waste and spoilage, is known as output or work output. Efficiency can also be expressed as a percentage by dividing the ratio by 100.

Efficiency will be 4/5 *100 i.e. 80%

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Whenever heat and pressure change an original as well as parent rock together into completely different rock, a metamorphosed rock is produced. The parent rock may be a sedimentary or metamorphic rock.

Try pressing a bleeding bandage on some fruit to quickly show the concept of pressure. Fruit won't have their surface cut if the flat portion of the blades is pushed against it. The troops is extensively scattered over the region (low pressure).

The averaged velocity transfer for every unit area in units of time caused through molecular collisions here between confined gas as well as its boundary is what the kinetic theory with ideal gases defines as air pressure.

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Answer: energy

Explanation: ghope thi hrkps

The difference in frequency between two interfering waves determines the frequency of the beat that is observed. Specifically, the beat frequency is equal to the absolute value of the difference in frequency between the two waves. However, we can say that the case with the greater difference in frequency between the original waves will produce more pronounced beats on the trace.

Let's call these differences Δf1 and Δf2:

Δf1 = |f1 - f2|

Δf2 = |f1 - f3|

The pair of waves with the greater difference in frequency will have a larger beat frequency and produce more distinct beats. The one with the larger absolute value will have a greater difference in frequency.

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A 30 cm long wrench is positioned at the origin, along the positive y-axis, and is holding a bolt. Just at end of the wrench, a force is exerted in the direction of "0, 3, and 4"

What does force in physics mean?

You can also use words like extend and squeeze to describe force. Force is described in physics as the pull or push that causes a massed object to change its speed. Force is an outside agent that has the power to alter a body's resting or moving position.

What function does force serve?

For instance, if there is no opposition, force is defined as the interaction that modifies an object's motion. When we look attentively at this sentence, we can see how push-pull plays a part in it. A pull is defined as a force that causes an object to move closer to you. On the other side, it is a shove if it travels away.

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The drone airplane will be going 200 m/s after 8 seconds.

An airplane is a powered, fixed-wing aircraft that is propelled forward by thrust from a jet engine, propeller or rocket engine. It is able to take off and land on runways, and can typically carry a large number of passengers and cargo. Airplanes are flown by pilots, and use a variety of instruments and controls to navigate and fly. They provide an efficient and cost-effective way to travel long distances and are used for both commercial and military purposes. Airplanes are an important component of modern transportation, with thousands of flights each day all around the world.

The speed of the drone airplane after 8 seconds can be calculated using the equation v = at, where v is the speed, a is the acceleration, and t is the time. In this case, v = 25 m/s2 x 8 s = 200 m/s.

Therefore, the drone airplane will be going 200 m/s after 8 seconds.

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A scientist is a person who is trained and educated in a scientific discipline, and who carries out research and experimentation in order to increase our understanding of the natural world

Scientists may work in a variety of fields, including physics, chemistry, biology, earth sciences, and many others.

They use the scientific method to design experiments, make observations, and analyze data in order to test hypotheses and advance our knowledge of the world around us. Scientists also communicate their findings to other scientists and the general public through scientific publications and presentations.

Generally, we can conclude that a scientist is a person who is trained and educated in a scientific discipline, and who carries out research and experimentation in order to increase our understanding of the natural world

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Explanation:

zero.

when the speed (velocity) does not change, there is no acceleration (which means the measure about how much the speed or velocity changes).

The sartorius muscle is the solution. A superficial muscle that runs the full length of the leg, the sartorius is involved in the flexion of the knee and hip.

The heart's wall is made up of cardiac muscle, which also causes the heart to contract vigorously. Intestinal, uterine, blood vessel, and internal ocular muscles are all made of smooth muscles.

The epidermis and some skeletal muscles are linked to the bones (muscles in our face). The skeletal muscles' contraction aids in the movement of the limbs and other bodily parts.

Although some estimates go as high as 840, the majority of sources claim that there are over 650 identified skeletal muscles in the human body.

Therefore, The sartorius muscle is the solution. A superficial muscle that runs the full length of the leg, the sartorius is involved in the flexion of the knee and hip.

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The man uses 558.6 watt power during climb a staircase up to a height of 6 m.

Potential energy is a form of stored energy that is dependent on the relationship between different system components.

When a spring is compressed or stretched, its potential energy increases. If a steel ball is raised above the ground as opposed to falling to the ground, it has more potential energy.

The potential energy gained = 65 × 9.8 × 6 Joule = 5586 Joule.

Hence, his power is = (5586 ÷ 10) Watt = 558.6 Watt.

So, the man uses 558.6 watt power during climb a staircase.

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A battery is used when we require more electricity because it can store and release electrical energy as needed.

Batteries consist of one or more cells, each of which contains two electrodes and an electrolyte that allows for the flow of charged particles between the electrodes. When a battery is connected to a device, the charged particles flow from the positively charged electrode to the negatively charged electrode, providing a flow of electricity.

The amount of electricity stored in a battery is limited, but it can be released as needed, even when the source of the electricity is not available. This makes batteries useful for supplying electrical energy in situations where there is a temporary increase in demand, such as when more devices are turned on or when the source of electrical energy is unavailable, such as during a power outage.

Additionally, batteries are portable and can be easily carried, making them useful for supplying electrical energy in remote locations where there is no access to the electrical grid.

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12 cm is the  distance from a tiny insect should you hold this lens to get a magnification of 3.00

f = 18 cm is a convex lens's focal length.Object separation, u =?The object is therefore 72 centimeters away.The object needs to be located 72 cm away from the lens.

apply 1/f  =  1/u +1/v, magnification m  = -v/u  =  3, so v  =  -3u, so  f  =  uv/u+v, f  =  u* -3u/(-2), u  =  2f/3, u  =2* 18/3, u  =  12 cm.

What image does a magnifying glass create?

The magnifying glass's image will be virtual, upright, and bigger than the thing as a result.Note: Binoculars, telescopes, and microscopes all require magnifying glasses.Because a convex lens is used within a magnifying glass, it is curved inward.

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If 1 kg ball is held motionless above the ground and then released. At impact, it was traveling at 5.50 m/s. The amount of the potential energy  it have before it was released is: D. 15.1 J.

Potential energy is related to the height of an object and can be calculated using the equation:

PE = mgh

where :

m = mass of the object

g =  acceleration due to gravity (9.8 m/s^2)

h = height above the ground

Since the initial velocity of the ball is zero, the potential energy can be calculated as follows:

PE = 0.5 * m * v^2

where:
m = mass of the ball (1 kg)

v =  velocity at impact (5.50 m/s)

PE = 0.5 * 1 kg * (5.50 m/s)^2 = 15.1J

Therefore the ball had 15.1 J of potential energy before it was released.

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The distance covered by new horizons to reach arrokoth was 12,500 km (7,800 mi).

In the Solar System, Arrokoth is the most distant and primitive object that a spacecraft has ever visited. On January 1, 2019, the NASA spacecraft New Horizons made a flyby of the object. The New Horizons crew searched for its Kuiper Belt flyby target after Pluto using the potent Hubble Space Telescope. The research team, lead by co-investigator Marc Buie, found an object that New Horizons may reach with its remaining fuel using data acquired with Hubble on June 26, 2014. In 2019, the object was given the nickname "Arrokoth" (a Native American phrase that meaning "sky" in the Powhatan/Algonquin language), minor planet number 485968, and the designation 2014 MU69.

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The time taken for the bumblebee to the reach the flower is 3.87 s.

The time taken for the bumblebee to the reach the flower that is 23.4 m away is calculated by applying the following equation as shown below.

s = vt + ¹/₂at²

where;

The time taken for the bumblebee to the reach the flower is calculated as;

23.4 = 4.09t + ¹/₂(1.01)t²

23.4 = 4.09t + 0.505t²

0.505t² + 4.09t - 23.4 = 0

solve for t using formula method,

t = 3.87 seconds

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To determine the components of a vector using its magnitude and angle, you can use trigonometry.

The x-part of a vector rises to the vector extent times the cosine of the point, and the y-part of a vector rises to the vector greatness times the sine of the point. So the part can be composed as:

x part = size * cos(angle)

y part = size * sin(angle)

Increasing a vector by a scalar influences greatness yet not course. The size of a vector is duplicated by a scalar, and the parts of a vector are increased by a scalar. So on the off chance that a vector has (x, y) parts, duplicating it by the scalar "k" yields another vector with (kx, ky) parts.

The bearing of the vector doesn't change. While deciding the parts of a

vector, you can utilize the size and point to track down the x and y parts. For this we can utilize geometry. Here, duplicate size by the cosine of a point to get the x part and increase greatness by the sine of a point to track down the y part. Duplicating a vector by a scalar influences the size of the vector, causing it to develop or recoil contingent upon the worth of the scalar, however doesn't adjust the vector's course. Vector parts are increased by scalars also.

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The time taken by the box to reach the velocity of 2 m / s will be 4 sec.

Force is defined as the external effort or agent applied to the object in a particular direction to displace it from one position to another position. The force is measured in a Newton.

Given that the force applied is 5 N and the velocity is 2 m / s. The mass of the object is 10 kg.

The time required by the object to get the velocity of 2 m/s will be calculated as:-

Force x Time = m x V

Time = ( m x V ) / F

Time  = ( 10 x 2 ) / 5

Time = 4 sec

Hence, the time will be equal to 4 seconds.

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Answer:

Approximately [tex]2.69\; {\rm A}[/tex].

Explanation:

Ensure that all values are measured in standard units. Charge should be measured in coulombs, while time should be measured in seconds:

[tex]\begin{aligned}t &= 3.0\; {\rm hr} \times \frac{3600\; {\rm s}}{1\; {\rm hr}} = 10800\; {\rm s}\end{aligned}[/tex].

Electric current [tex]I[/tex] is the rate of flow of electric charge.

In order to find the electric current, divide electric charge [tex]q[/tex] by the time [tex]t[/tex] required to transfer these charge. If charge [tex]q\![/tex] is measured in coulombs and time [tex]t\![/tex] is measured in seconds, the unit of current [tex]I[/tex]would be amperes:

[tex]\begin{aligned}I & = \frac{q}{t} \\ &= \frac{29000\; {\rm C}}{10800\; {\rm s}} \approx 2.69\; {\rm A}\end{aligned}[/tex].

To determine the electric field at point P due to a long cylinder, a cylindrical Gaussian surface should be used.

The Gaussian surface should be centered on the point P, and should be oriented along the axis of the cylinder. The surface should be perpendicular to the electric field vector, and should enclose the entire cylinder.

A Gaussian surface is a closed surface in three-dimensional space through which the flux of a vector field is calculated.  It is typically used to calculate the electric flux of an electric field or the gravitational flux of a gravitational field.

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Answer:

do u want the definition of refraction?

Explanation:

Refraction is defined as the phenomenon of bending of light ray when it travels from one medium to another of refractive index.

The speed of the  Toyota Corolla would have  been 143.9 mph.

The acceleration of the F-15 can be calculated as follows:

Acceleration = Velocity Change / Time = (Take-off Speed) / Time

where;

Take-off Speed = √(2dg /t²)

Take-off Speed = √(2 x  (270 ft)  x 32.2 ft/s² / (2 s)²)

T  = √(17496) = 131.6 ft/s

Acceleration = Velocity Change / Time

= (131.6 ft/s) / (2 s) = 65.8 ft/s²

We can use the same acceleration to launch the Toyota Corolla, and calculate its final velocity:

Final Velocity = Initial Velocity + Acceleration x Time

where;

Final Velocity = 0 + (65.8 ft/s²) * (2 s) = 131.6 ft/s

Finally, we can convert the velocity from feet per second to miles per hour:

Velocity (mph) = Velocity (ft/s) x (1 hour/3600 s) x (5280 ft/mile)

= 131.6 ft/s x  (1 hour/3600 s)  x (5280 ft/mile)

= 143.9 mph

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The motions of the atoms are ____ when they are connected by a cable. A) Constant independence B) Constant dependence reliant, but not necessarily

What is the motion process?

The act of moving, changing location, or even merely changing position is referred to as motion. Every time something moves, a lot of elements come into play. If an object travels in a single direction at a constant speed, there are fewer variables at play. The majority of movement, however, involves varying the movement's speed and direction.

What makes motion different from terms?

Motion and Conditions The act of moving, changing location, or even merely changing position is referred to as motion. Every time something moves, a lot of elements come into play. If an object travels in a single direction at a constant speed, there are fewer variables at play.

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Answer:

Circular orbits, which were believed to be perfect and uniform, but were later shown to be elliptical by Johannes Kepler. Another flaw was that it relied on the idea of epicycles, which were additional circular orbits used to explain the observed irregularities in the motions of the planets. Despite these flaws, Copernicus's model marked a major step forward in astronomical understanding by proposing a heliocentric model, in which the Earth and other planets revolved around the sun, instead of the Earth being the center of the universe.

Nicolaus Copernicus was a Renaissance-era astronomer and mathematician who is famous for his heliocentric model of the solar system. The Copernican model proposed that the Sun, rather than the Earth, was at the center of the universe, and the planets, including Earth, orbited around it. This model was a significant improvement over the earlier geocentric models that placed Earth at the center of the universe. However, Copernicus's model still had some significant flaws.

One major flaw in Copernicus's model was that it assumed that the planets moved in perfect circles around the Sun. In reality, the orbits of planets are elliptical, meaning they are more like stretched-out circles. Copernicus's model failed to account for this, and as a result, it could not accurately predict the positions of the planets.

Johannes Kepler, a contemporary of Copernicus, recognized this flaw and eventually developed his three laws of planetary motion, which accurately described the elliptical orbits of the planets. Kepler's laws replaced Copernicus's assumption of circular orbits and helped to refine our understanding of the solar system.

Another flaw in Copernicus's model was its inability to explain retrograde motion. Retrograde motion is the apparent backward motion of planets in the sky. Copernicus's model suggested that this motion was caused by the planets moving in circular orbits around the Sun, with Earth sometimes overtaking and passing them. However, this explanation was incomplete and did not account for the complex motions of the planets.

It was not until later when astronomers like Tycho Brahe, Kepler, and Galileo Galilei made more precise observations and developed more accurate models that the flaws in Copernicus's model were fully recognized. Nonetheless, Copernicus's model represented a significant step forward in our understanding of the universe, and it paved the way for the development of more accurate models.

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Answer:

srry

Explanation:

The pressure at each of the five points would increase by ρg × 1 Pa.

The pressure at each of the five points would increase if the tank and its previous contents were buried an extra 1 meter below the current level. The pressure at a point in a fluid is proportional to the height of the fluid column above that point. Since the pipe to the surface is now 3 meters long, the height of the fluid column above each of the five points has increased by 1 meter. Hence, the pressure at each of the five points would increase by an amount proportional to the height of the fluid column, or P2 = P1 + ρgh, where P1 is the original pressure, P2 is the new pressure, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the increase in height. As a result, the pressure at each of the five points would increase by ρg × 1 Pa.

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Answer:

  C.  16.3 m/s

Explanation:

You want to know the final velocity of the combined mass of a 2130 kg car at 21.5 m/s after collision with a 2240 kg car at 11.4 m/s in the same direction. Momentum is conserved.

The momentum of each object is the product of its mass and velocity. When momentum is conserved, the momentum of the mass after the collision is the same as that before the collision.

  m1·v1 +m2·v2 = (m1 +m2)·v3

Then the velocity after the collision is ...

  v3 = (m1·v1 +m2·v2)/(m1 +m2)

You may recognize this as the weighted average of the initial velocities, where the weights are the respective masses of the objects.

  v3 = (2130·21.5 +2240·11.4)/(2130 +2240) ≈ 16.3

The final velocity is 16.3 m/s, matching choice C.

The equation for centripetal acceleration can be written as follows : a = v² / r = (rw)² / r = r × w² , the relationship between angular velocity and linear velocity : v = r × w

A.The following equation can be used to calculate the centripetal acceleration during a circular motion:

Consider a particle of mass m traveling at an angular velocity w in a circle of radius r. The particle's velocity is calculated as v = rw, where v is its linear velocity.

The net force exerted on the particle can be calculated using Newton's second law as follows:

                                      F = m × a,

where a is the particle's acceleration.

The centripetal force is the net force exerted on the particle, which must be directed toward the circle's center.

As a result, the equation for centripetal acceleration can be written as follows:

                     a = v² / r = (rw)² / r

                               = r × w²

This equation is usually written as:

                                       a = r × w².

According to Newton's third law of motion, there is an equal and opposite reaction to every action. The gravitational force exerted by the moon in this system is the same as that exerted by the Earth in this system. Newton's third law of motion, also known as the action-reaction pair of forces, describes this phenomenon.

B) (i) The equation below describes the gravitational force that is exerted on the moon:

                               F =G × (m_earth × m_moon) / r²

G is the gravitational constant, m_earth is the Earth's mass, m_moon is the moon's mass, and r is the distance between the Earth's and moon's centers.                  

(ii) We need to divide the circumference of the moon's circular path by its linear velocity in order to determine the time it takes for the moon to complete one complete revolution around the Earth:

                          C = 2 × pi × r

                               v = C / T

where C is the circumference of the moon's circular path, r is the circular path radius, T is the time it takes to complete one revolution, and v is the moon's linear velocity.

We obtain: by substituting the values:

                 C = 2 × pi × 400000 km = 800000 × pi km

                            v = C / T = (800000 × pi km) / T

We need to know the moon's angular velocity in order to calculate the time. These numbers indicate the relationship between angular velocity and linear velocity :

                       v = r × w

Substituting the values, we get:

                                T = C / (r × w)

                        = (800000 × pi km) / (400000 km × w)

                               = 2 × pi / w

Since the angular velocity w is not specified, it is not possible to determine how long it would take for the moon to complete one complete revolution around the Earth.

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In Plato's philosophy, Socrates believed that he should follow the laws of the state of Athens because he believed in the idea of the "philosopher-king."

Who was Socrates?

Socrates was a classical Greek philosopher, credited as one of the founders of Western philosophy. He is best known for his method of inquiry, called the Socratic method, and for his teaching style, which was dialogic and aimed at getting students to think critically and develop their own ideas.

According to Socrates, the laws of the state were a reflection of the absolute and unchanging moral values that exist in the world. He believed that as a philosopher, it was his duty to live in accordance with these moral values, and thus to follow the laws of the state. In this way, Socrates saw himself as a servant of the divine, and believed that by following the laws, he was serving the greater good and promoting the welfare of the city.

Hence, In Plato's philosophy, Socrates believed that he should follow the laws of the state of Athens because he believed in the idea of the "philosopher-king."

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