Water flows through a pipe with a cross-sectional area of 0.002 m^2 at a mass flow rate of 4 kg/s. the density of water is 1 000 kg/m^3. Determine its average velocity

The mass of the girl must be 30 kg for the see-saw to be in equilibrium.

In order for the see-saw to be in equilibrium, the total moment on one side of the pivot must be equal to the total moment on the other side of the pivot. The moment of an object is equal to its weight multiplied by its distance from the pivot.

So, for the see-saw to be in equilibrium:

40 kg * 300 cm = ma * 400 cm

ma = (40 kg * 300 cm) / 400 cm

ma = 30 kg

The mass of the girl must be 30 kg for the see-saw to be in equilibrium.

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Located in Louisa County, Va, in the Mid-Atlantic region of the United States, the 1,075-acre North Ana Nuclear Power Plant is a nuclear power station. The Duke Virginia Power corporation and the Old Dominion Corporation jointly own the property, which is run by the Dominion Generation company.

What do you mean by nuclear?

The energy found in an atom's nucleus, or core, is referred to as nuclear energy. Electricity can be produced using nuclear energy, but it first needs to be freed from the atomic. 8 - 12+ Picture.

Which are the 3 different nuclear types?

Rocks, sunlight, and cosmic rays all emit tiny quantities of radiation that are constantly absorbed by all living organisms. Three kinds of radiation are taken into account in this background sheet: -particles, -particles, and -rays.

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The benefits of using solar, geothermal, and wind power as alternative sources of energy are low maintenance, accuracy, and highly renewable respectively.

Reduced electricity expenses, a wide range of applications, and minimal maintenance costs are all benefits of solar energy. The fact that it depends on the weather, that solar energy storage is expensive, and that it takes up a lot of space are some of its drawbacks.

Geothermal energy has the benefit of making it simpler to anticipate power output with pinpoint accuracy. Cons of energy management include high costs and the need for sustainability.

The benefit of wind energy is that it is a very clean and renewable energy source. It is readily available and has a low running cost. The energy's drawback is that it contributes to noise and visual pollution.

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Changes in volume and density cause a gas in the atmosphere to rise as it is heated, and as a gas rises, its temperature decreases.

As a gas is heated, the molecules that make up the gas gain energy and begin to move faster. As the molecules move faster, they collide with each other more frequently and with greater force, causing the gas to expand and its volume to increase.

As the gas expands, its density decreases, and its buoyancy increases, making it less dense than the surrounding air. When a gas is less dense than the surrounding air, it tends to rise, which is known as convection.

Therefore, As a gas rises, it experiences a decrease in temperature, this is due to the decrease in atmospheric pressure. When a gas rises, the pressure on it decreases, which causes the gas to cool down.

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The rotational inertia of the meter stick about the midpoint is 0.0625 kg·m²

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Explanation:

light takes 8 seconds to travel from the sun to earth this is because light travels at 671 million miles an hour

A spring has a spring constant of 25 newtons per meter. The minimum force required to stretch the spring 0. 25 meter from its equilibrium position is approximately  6.25 N.

The minimal force needed to stretch the wire is in the range of,

We knew that the force, extension, and spring constant are connected by the following formula according to Hooke's law:

Extension (E) = Force (F) x Spring constant (K) (e)

F = Ke

We may calculate the spring's extension from its equilibrium position using the aforementioned method.

F = ke

F= 25 x0.25

F= 6.25

Therefore, 6.25 N of minimum force is needed in the scenario described.

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The pressure at a point in a fluid depends on its weight.

Weight is the product of mass of the object and the acceleration due to gravity.

Fluid pressure is the pressure at a point inside a fluid due to the weight of the fluid.

The pressure in liquids can be calculated using the following relationship,

[tex]P_{fluid}[/tex] = P + ρgh

where,

[tex]P_{fluid}[/tex] = pressure at a point in the fluid

P = pressure at reference point

ρ = Density of liquid

g = gravitational acceleration (relative to the ground g = 9.8 m/s)

h = Height from reference point

Two factors affect fluid pressure.

These two elements are the depth and density of the fluid.

Therefore the fluid pressure depends on the weight at a point.

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Answer:

x-component = 50√3

y-component = 50

Explanation:

Two-dimensional vectors consist of two components which are x-component and y-component. The vector equation can be written as:

[tex] \displaystyle{ \vec v = x \hat i + y \hat j}[/tex]

Each components also can be written in trigonometric form:

[tex] \displaystyle{x = | \vec v| \cos \theta} \\ \displaystyle{y = | \vec v| \sin \theta}[/tex]

The absolute of vector is called magnitude of vector which is already given in the problem (100 m). The measurement or theta is also given as well, therefore:

[tex] \displaystyle{x = 100 \cos 30 \degree } \\ \displaystyle{y = 100\sin 30 \degree}[/tex]

Then evaluate, we have to know that sin30° is 1/2 and cos30° is √3/2.

[tex] \displaystyle{x = 100 \times \dfrac{ \sqrt{3}}{2} } \\ \displaystyle{y = 100 \times \dfrac{1}{2}}[/tex]

Therefore, the components are:

[tex] \displaystyle{x = 50 \sqrt{3} } \\ \displaystyle{y = 50}[/tex]

Answer:

Below

Explanation:

Speed of sound at 16 degrees C = 340.866 m/s

  (Speed of sound at 0 degrees C is 331.3 m/s   ....I do not know where they got the incorrect value of 345 m/s at 0 °C)

2.5 s   *   340.866 m/s =  852 m away from fireworks

Fixed automation, Programmable automation, Flexible automation are the types of automations in electromechanical device.

Fixed automation is typically employed for products with a very high production rate; the high initial cost of fixed-automation plant can therefore be spread over a very large number of units. Fixed-automation systems are used to manufacture products as diverse as cigarettes and steel nails.

The significant feature of fixed automation is that the sequence of the manufacturing operations is fixed by the design of the production machinery, and therefore the sequence cannot easily be modified at a later stage of a product’s life cycle.

Flexible automation can be considered to be an enhancement of programmable automation in which a computer-based manufacturing system as the capability to change the manufacturing program and the physical configuration of the machine tool or cell with a minimal loss in production time.

In many systems the machining programs are prepared at a location remote from the machine, and they are then transmitted as required over a computer-based local-area communication network.

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The correct claim that represents the mechanical energy of the system is that the system is open, because there is a net force exerted on the block.

Mechanical energy (kinetic energy or potential energy) is the energy of a moving object or the energy stored in objects due to their position. Mechanical energy is another source of renewable energy. In an open system, force is applied directly on an object.

Objects have mechanical energy if they are moving and/or are in a specific position relative to the surface. A box held vertically above the ground, for example, will have only potential energy. A moving vehicle has mechanical energy due to its motion, which is known as kinetic energy.

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Metals' complex structures account for their high melting and boiling temperatures as well as their conductivity. A metal's characteristics can be changed by adding another substance to it to create an alloy.

Of all the metals, silver has the highest electrical conductivity. In actuality, silver is the standard by which conductivity in all other metals is measured. Silver ranks 100 on a scale of 0 to 100, followed by copper at 97 and gold at 76.

Due to the fact that the atoms in metals form a matrix through which outside electrons can easily travel, metals are efficient conductors of both electricity and heat. They produce a sea of electrons surrounding the positive nuclei of the interacting metal ions rather than orbiting their individual atoms.

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The average velocity of that driver is 58 mi/h.

As per data given:

first velocity (V1) = 60 mi/h

first distance (s1) = 100 miles

second velocity (V2) = 55 mi/h

second distance (s2) = 50 miles

First, we have to find the time spend that driven in first 100 miles by calculate it as follow:

V1 = s1 : t1

60 = 100 : t1

t1 = [tex]\frac{10}{6}[/tex] h

Then calculate the second condition in 50 miles:

V2 = s2 : t2

55 = 50 : t2

t2 = [tex]\frac{10}{11}[/tex] h

then calculate the average velocity:

Average velocity = total distance / total time

Average velocity = 150 : ([tex]\frac{10}{6}[/tex] +   [tex]\frac{10}{11}[/tex] )

Average velocity = 58.2352941176

Let round the value to 58 mi/h. Hence, the average velocity of the driver is 58 mi/h

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When trying to balance a tennis ball on the edge of a ruler, the ball can only balance when the balance point of the ball is determined.

The balance point of an object such as a tennis ball is the point where the object balances.

Even though an object's weight exerts downward pressure on each of its constituent parts, it is typically thought of as exerting a single force through the object's center of gravity or balance point.

The object's geometric center serves as its balancing point if its weight is spread evenly throughout it.

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The answer of the following statement is (C) why joining a team is often really discouraging.

Team refers to a group of two or more people who work together to achieve a common goal. A team usually consists of individuals with different skills and abilities who collaborate to complete a task or project. Teams are important in a variety of situations, including work, school, sports, and social activities. A successful team is one in which members are committed to the same goal, trust and respect one another, and are willing to take risks and learn from mistakes. Teams are most effective when members are open to constructive criticism, provide feedback, and are willing to put in the time and effort necessary to achieve their goals.

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Answer:

  85.2 N

Explanation:

You want to know your weight if the Earth were 3 times as massive and had 5 times the present radius. Your weight is 710 N.

Your weight is proportional to the mass of the Earth and the square of the radius between your mass and the center of the Earth. The revised dimensions of the earth would multiply your weight by ...

  W = k(M/r²) = 710 N

  W' = k((3M)/(5r)²) = k(M/r²)(3/25) = (710 N)(3/25) = 82.5 N

Your weight would be 82.5 N.

With the use of Ohm's law formula and some assumption, the answers are

(a) V2 = 30v

(b) I2 = 5 A

(c) R1 = 1 Ω

(d) R2 = 6 Ω

(e) RT = 4 Ω

Current can simply be defined as the rate at which charges flow in a conducting material. It is measured in Ampere.

From the given circuit,

a) V2 and V3 are in parallel, so they will have the same voltage. The voltage dropped in V1 should be taken away from the total voltage. That is,

V2 = VT - V1

V2 = 40 - 10

V2 = 30v

b) The current produced from the battery is assumed to split equally on R2 and R3. Therefore, I2 = 5 A

c) The total current will flow through I1. That is,

I1 = 10 A

Using Ohm's law V1 = I1 × R1

10 = 10 × R1

R1 = 10/10

R1 = 1 Ω

d) From Ohm's law, V2 = I2 × R2

30 = 5R2

R2 = 30/5

R2 = 6 Ω

e) By using Ohm's law again

VT = IT × RT

40 = 10 × RT

RT = 40/10

RT = 4Ω

Therefore, The resistance in R1, R2 and R3 are 1Ω, 6Ω and 6Ω

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The speed of the car after 4.55 s can be determined using the equation v = at, where v is the velocity of the car, a is the acceleration, and t is the time.

What is acceleration?

Acceleration is the rate of change of an object's velocity over time. It is the rate at which an object's speed or direction of motion changes. It is usually measured in meters per second squared (m/s2). Acceleration can be caused by a variety of forces, such as gravity, friction, or a push or pull.

Acceleration is the rate at which an object's speed or velocity changes over time. It is a vector quantity, meaning it has both a magnitude and a direction. Acceleration is typically measured in meters per second squared (m/s2).

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Answer: 20 J

Explanation: m = 10kg

                       v = 2 m/s

K.E of the object = 1/2 mv²

                             =  1/2 × 10 × 2 × 2

                             =   10 × 2

                             =    20 J

Answer:

3.7 m/s^2

Explanation:

Lets start by calculating the gain in potential energy when the Ingenuity rises to 75 meters from Mars' surface.  It has a mass of 1.8kg.  The potential energy is given by PE = mgh, where m is mass, g is the acceleration due to Mars' gravity, and h is height, in meters.

PE = (1.8kg)(75 meters)(g)

PE = (135 kg*m)*g

This required 500J of energy from the battery.  1 Joule = 1 kg*m^2/s^2

That means the PE gain is equal to 500 kg*m^2/s^2.

Set this equal to the PE we first calculated:

 500 kg*m^2/s^2 = (135 kg*m)*g

g = (500 kg*m^2/s^2)/(135 kg*m)

g = 3.7 m/s^2

The published value is 3.721 m/s^2

Answer:

Approximately [tex]3.7\; {\rm N\cdot kg^{-1}}[/tex] assuming that the energy from the battery was entirely converted into gravitational potential energy.

Explanation:

Near the surface of a planet, the gravitational field is approximately uniform. Let [tex]g[/tex] denote the gravitational field strength. When an object of mass [tex]m[/tex] is lifted up and its height increases by [tex]\Delta h[/tex], the gravitational potential energy (GPE) of this object would have increased by [tex]m\, g\, \Delta h[/tex].

Under the assumptions, the gravitational potential energy of this helicopter would have increased by [tex]500\; {\rm J}[/tex]. In other words:

[tex]\begin{aligned}& m\, g\, \Delta h = (\text{change in GPE}) = 500\; {\rm J}\end{aligned}[/tex].

It is given that [tex]m = 1.8\; {\rm kg}[/tex] and [tex]\Delta h = 75\; {\rm m}[/tex]. Rearrange the equation above to find gravitational field strength [tex]g[/tex]:

[tex]\begin{aligned}g &= \frac{(\text{change in GPE})}{m\, \Delta h} \\ &= \frac{(500\; {\rm J}))}{(1.8\; {\rm kg})\, (75\; {\rm m})} \approx 3.7\; {\rm N\cdot kg^{-1}}\end{aligned}[/tex].

The probability that a string of Christmas lights containing 20 lights are wired in series, so that if any light fails, the whole string will go dark = 0.6676 = 66.76%

There are just two conceivable outcomes for each light: either it works or it doesn't. The binomial distribution is utilized to answer this question since the likelihood that a light will operate independently of all other lights.

It's a binomial experiment. Since the bulbs are independent and there is only one way the string can stay lit

The success probability is:

1 -0.02 = 0.98

Hence, the probability that the string of lights will remain bright for 3 years ​is:

(0.98)²₀ = 0.667

= 66.67%

The question is incomplete, it should be:

Merry and bright? A string of Christmas lights contains 20 lights. The lights are wired in series, so that if any light fails, the whole string will go dark. Each light has probability 0.98 of working for a 3-year period. The lights fail independently of each other. Find the probability that the string of lights will remain bright for 3 years.

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The centripetal acceleration of the string is 18.1 m/s². The tension on the string is the sum of its weight and the force by the centripetal acceleration.

Centripetal acceleration is acceleration of a body moving through a circular path. It is related to the velocity and radius as written below;

a = V²/ R

Here v = 5/1.5 sec/60 = 3.3 m/s

R = 1.2/2 = 0.6 m

then a = 3.3 × 3.3 / 0.6 m = 18.1 m/s²

The tension on the string = ma + mg

T = 0.15 kg (18.1 + 9.8 m/s² ) = 13.97 N.

Therefore, the tension acting on the string is 13.97 N.

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Answer: .86

Explanation:

The center of the mass of the block-system is moving with a velocity of 1.3 meters per second in the same direction as B.

In this case, we are provided with:

The mass of block A (M1) = 4 kg

The speed of block A (V1) = 2.0 meters per second

The mass of block B (M2) = 8 kg

The speed of block B (V2) = 3.0 meters per second

Consider that block A is moving in a positive direction while block B moving the opposite way.

To find the velocity of the center of the mass of the two block system, we can use this following formula:

[tex]V = \frac{M1V1 + M2V2}{M1+M2}[/tex]

To find the answer, simply plug in all of the information that you already have into the equation:

[tex]V = \frac{(4 kg) (2m/s) + (8kg) (-3m/s)}{4 kg + 8 kg}[/tex]

V = -1.3 m/s

Because the sign is negative, we may deduce that the center of mass of the two-block system is traveling in the same direction as B at a speed of 1.3 m/s.

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Answer:

Gamma rays cannot be seen or felt, but can cause ionization.

Explanation:

Gamma rays are a type of electromagnetic radiation, similar to X-rays, radio waves, and visible light. They have the highest energy and the shortest wavelength in the electromagnetic spectrum. Gamma rays are emitted by the nuclei of atoms during certain types of radioactive decay.

Gamma rays cannot be seen or felt because they are electromagnetic waves, and not particles like visible light or sound waves. Gamma rays do not have enough energy to excite the atoms in our eyes, so we cannot see them. They also do not have enough energy to cause vibrations in our ears, so we cannot hear them.

Gamma rays can cause ionization when they interact with matter, meaning that they can knock electrons off atoms and molecules, creating ions. When gamma rays pass through matter, they can disrupt the electrons in atoms and molecules, which can cause damage to living cells and genetic material. This is why gamma rays are considered to be dangerous and are used in very limited circumstances, such as in cancer treatment, where the goal is to destroy cancer cells.

The disadvantages of using solar and wind energy are:

Solar and wind energy are renewable energy sources that produce clean, renewable electricity by harvesting the naturally occurring power of the sun and wind.

Solar energy is harnessed with photovoltaic (PV) cells, transforming the sun’s energy into electricity. Wind energy is harvested with wind turbines, which convert the kinetic energy of the wind into electrical energy. Both solar and wind energy are cost-effective, clean, and renewable sources of electricity.

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The mass of an atom that have six protons; six neutrons; and six electron is 12. The mass of an atom is the total of its protons and neutron

Atom is the smallest structure of the chemical element. Atom contain protons, neutrons and electrons. Protons is a subatomic that contains positive electric charge where the electrons is a subatomic that contains negative electric charge or the opposite of the protons. Neutrons is a subatomic that contain no electric charge. The mass number of an atom is formulated as mass number = protons + neutrons. Hence:

mass number = protons + neutrons.

mass number = 6 + 6

mass number = 12

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Although having multiple states is conceivable, it's also feasible to have just one.

This discrepancy is expressed by the phrases attainable and feasible, which are used in certain definitions of these synonyms. As is frequently the case, the Latin-derived phrase is utilized when technical specificity, distance, and an element of abstraction are required.

Project feasibility refers to the examination of a project's numerous components to ascertain whether it has the potential to succeed. Before a project starts, a business might assess its viability to spot challenges, develop plans to address them, and eventually draw in investors.

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If a van traveled 225 miles in 5 hours, then the van could travel 315 miles in 7 hours.

A mile is a unit of length in the imperial and United States customary systems of measurement. One mile is equal to 5,280 feet, 1,760 yards, or 1.609 kilometers. The word mile is derived from the Latin mille passus, meaning "a thousand paces." The mile was historically used as a unit of measurement for roads, and was once considered a basic unit of measurement in many countries, although usage has changed over time.

To determine how far a van could travel in 7 hours, you would need to know its average speed. If the van traveled 225 miles in 5 hours, you can calculate its average speed by dividing the distance traveled by the time it took to travel that distance:

225 miles / 5 hours = 45 miles per hour

Once you know the average speed of the van, you can calculate how far it could travel in 7 hours by multiplying the speed by the time:

45 miles per hour x 7 hours = 315 miles

So the van could travel 315 miles in 7 hours.

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