The upper part of a thunderstorm cloud is normally ____ charged, and the middle and lower parts are ____.​
​positively; positive
​negatively; neutral
​positively; negative
​negatively; positive
​positively; neutral
​positively; negative

A group of people pulling up on by pulley is way easier than by pulling directly because a pulley system is a freight lift system that allows objects to be hoisted to higher floors with less force. The pulley mechanism is used for Wells to hoist the bucket out of the well. In order to operate, certain forms of gym equipment use pulleys. In order to lift and position heavy goods, building pulleys are used.

A wheel on an axle or shaft known as a pulley is used to transfer power from the shaft to the cable or belt or to sustain movement and direction change of a taut cable or belt. The supporting shell is known as a block, and the pulley may also be referred to as a sheave or a pulley wheel when it is supported by a frame or shell but does not transmit power to a shaft. For the purpose of locating the cable or belt, a pulley may include a groove or grooves between flanges around its circle. A rope, cable, belt, or chain may serve as the drive component of a pulley system. It is example of  simple machines.

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Answer:

13.94 rpm

Explanation:

Given that,

The diameter of the pulley, d = 14 foot

Radius, r = 7 foot

The linear velocity of the pulley, v = 14 mph = 20.53 ft/s

We need to find the angular velocity in rpm.

We know that, the relation between the linear velocity and the angular velocity is as follows :

\(v=r\omega\\\\\omega=\dfrac{v}{r}\\\\\omega=\dfrac{20.53}{14}\\\\\omega=1.46\ rad/s\)

or

\(\omega=13.94\ rpm\)

So, the angular velocity of the pulley is 13.94 rpm.

The interval between the first and second echo is 7 seconds. This means that after the initial sound wave reaches the first cliff, it takes a total of 7 seconds for the sound to travel to the second cliff and then return to the student as the second echo.

To determine the interval between the first and second echo, we need to consider the time it takes for sound to travel from the student to the first cliff, and then from the first cliff to the second cliff, and finally back to the student.

Let's break down the distances and calculate the time for each part of the journey:

Distance from the student to the first cliff: 330 meters

Time taken: t₁ = distance / speed = 330 m / 330 m/s = 1 second

Distance from the first cliff to the second cliff: 990 meters

Time taken: t₂ = distance / speed = 990 m / 330 m/s = 3 seconds

Distance from the second cliff back to the student: 990 meters

Time taken: t₃ = distance / speed = 990 m / 330 m/s = 3 seconds

Now, we can calculate the total interval between the first and second echo by adding up the individual times:

Interval between first and second echo = t₁ + t₂ + t₃ = 1 s + 3 s + 3 s = 7 seconds

Therefore, the interval between the first and second echo is 7 seconds. This means that after the initial sound wave reaches the first cliff, it takes a total of 7 seconds for the sound to travel to the second cliff and then return to the student as the second echo.

It's important to note that this calculation assumes a straight path for the sound waves and neglects factors such as air temperature and wind that can affect the speed of sound. Additionally, it assumes perfect reflection of sound waves off the cliffs, which may not be the case in real-world scenarios.

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Note the complete questions is:

A student stands 330m from a tall cliff which is 990m from another tall cliff. If the speed of sound between the cliffs is 330m/s.What is the interval between the first and second echo?

Answer:

A.No. Assuming no other factors (such as air resistance) the first object will have a velocity of 32 feet/second when the other is dropped. Since they will both have the same acceleration, the first distance between them will increase by 32 feet per second.

Explanation:

When the current in the wire is decreasing the oppose magnitude of the magnetic flux in the loops is decreasing.

Induced currents in the loops and the forces exerted on them are directed so they oppose this change

Magnetic flux is a size of the entire magnetic subject which passes thru a given region. it's far a useful device for helping describe the outcomes of the magnetic pressure on some thing occupying a given location.

Magnetic flux through a surface is the surface integral of the ordinary element of the magnetic subject B over that floor. it is also denoted Φ or ΦB. The SI unit of magnetic flux is the weber, and the CGS unit is the maxwell.

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The electron number cannot be used instead because electrons can be removed from or added to an atom (option C)

The element of an atom is determined by its proton count, while the electron count can exhibit variability. Take, for instance, a sodium atom, which encompasses 11 protons and 11 electrons. However, it has the capacity to relinquish one electron, transforming into a sodium ion housing only 10 electrons.

This occurs due to the relatively loose binding of electrons to the nucleus, enabling their removal through the influence of an electric field or alternative mechanisms.

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Answer:

Explanation:

p = mv = 0.075(0.5) = 0.0375 kg•m/s

The radial acceleration of the blade tip is  1370 g rad/s².

Radial acceleration is defined as "the acceleration of the object is along the radius, directed towards the center" in uniform circular motion.

Given parameters:

Rotational speed of the helicopter rotor: ω = 600 rev/min

= 600 × 2π/60 rad/min.

= 20π rad/min.

Length of the blade: r = 3.4 m.

Then,   the radial acceleration = ω²r = (20π)²× 3.4 rad/s².

= {(20π)²× 3.4}/9.8 g rad/s².

= 1370 g rad/s².

Hence,  the radial acceleration of the blade tip is  1370 g rad/s².

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Answer:

37.3ml

Explanation:

87.3 ml-50 ml=37.3ml

Answer:

ok

Explanation:

g

The electrical force between the two charges can be calculated as +1.8×10⁻² N and its repulsive.

To find the electrical force, distance = 2 meters

charge q1 = 2×10⁻⁶ C

charge q2 = 4×10⁻⁶ C

         The force of attraction or repulsion acting along a straight line between two electric charges is directly proportional to the product of the charges and inversely to the square of the distance between them.

Formula can be written as,

          F = K ( q1q2 / r² )

F - electric force

k - Coulomb constant

q1, q2 - charges

r - distance of separation

Substituting the values in the formula,

         F = 9 × 10⁹ Nm²/C² ( (2×10⁻⁶ C ×  4×10⁻⁶ C) / (2²))

            = 0.0179751

         F = 1.8 × 10 ⁻² N.

As both the charges q1 and q2 are positive, the charges gets repulsive.

SO, the correct answer is Option A.

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Answer:

24km/h

Explanation:

go it right on ingenuity 2020

Answer:

5.8E-3m/s

Explanation:

Using

V= d/t

V= velocity

d= distance

t= time

But d= 2πr

But 180rev= 1min

So 1min/180= 60s/180

So

Vavr= 2π(10m)/180*60

=5.8E-3m/s

The subject depicted in the attached image is Astronomy and Astrophysics.

Astronomy is the scientific study of celestial objects such as stars, planets, galaxies, and other phenomena that exist outside of Earth's atmosphere.

Astronomers use a variety of methods to observe and study these objects, including telescopes, spacecraft, and computer simulations.

Astronomy is a broad field that includes many different sub-disciplines, such as astrophysics, planetary science, and cosmology.

Astronomers study the physical properties and behavior of celestial objects, such as their composition, temperature, motion, and evolution.

They also seek to understand the structure and history of the universe as a whole.

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The change in the stored thermal energy store of the ice block is 68040 J.

Thermal energy is the energy of a substance due to the movement of the atoms or molecules in the compound.

The thermal energy of a substance increases when heat is added to the substance which then results in an increase in temperature of the substance.

The change in the stored thermal energy store of the ice block is calculated as follows:

ΔQ = mass * specific capacity * temperature change

where;

The specific heat capacity of ice = 2 100 J/(kg°C)

The mass of the 1.8 kg block

Temperature  difference = 0 - (-18) = 18 °C

ΔQ = 1.8 kg * 2100 J/kg/°C * 18 °C

ΔQ = 68040 J

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Explanation:

imagine a column of water of 1 m² that starts at the surface of the ocean, which goes straight down 700m.

You need to calculate the pressure induced by only the column of water.

Please understand that the total pressure is found by adding the pressure of the column of water AND that of the pressure of the atmosphere.

p = F/A

p = pressure in Pa

F = Force in N

A = area in m²

To calculate the Force that gravity has on that column of water, you simply use:

F = m * g

where g = 9.81 kgm/s²

So first you need to calculate the mass of the column sea water with a density of 1.024*10³ kg/m³

Answer:

Explanation:

As the sum of the two right directed forces match exactly the left directed force, the only unbalanced force, and thus the net force, is the upward 25 N force.

The potential energy of the roller coaster is 176,400 J (joules).

The potential energy of an object is given by the formula PE = mgh, where PE is the potential energy, m is the mass of the object, g is the acceleration due to gravity, and h is the height or vertical position of the object.

In this case, the roller coaster is at a peak of 20m and has a mass of 900kg. The acceleration due to gravity, g, is approximately 9.8 \(m/s^2\).

Using the formula, we can calculate the potential energy:

PE = mgh

= (900 kg)(9.8 \(m/s^2\))(20 m)

= 176,400 J

Therefore, the potential energy of the roller coaster is 176,400 J (joules).

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Answer:

1.5

Explanation:

A 51.2 N force F applied at an angle of 56.3 degrees above the radial line will produce a torque of 17.1 Nm on the pivot point P and a 14.07 Nm torque on the same point.

According to the selected pivot point, torque can be applied either clockwise or counterclockwise, as shown for points B and A, respectively, If the object is capable of rotating around point A, it will turn counterclockwise, hence the torque for the force will be displayed as anticlockwise with respect to A.

The following formula must be used to determine the torque caused by the force F on the pivot point P:

Torque is calculated as force times the angle between the force and the pivot point.

The torque is simply: since the force F is perpendicular to the rod.

Force times rod length equals torque.

Torque equals 51.2 N x 0.333 m, or 17 Nm.

B) We must figure out the perpendicular component of the force that affects the torque if the force F is applied at an angle of 56.3 degrees above the radial line. The force's perpendicular component is represented by:

Force x Sin = Perpendicular Force(angle)

Force perpendicular: 42.2 N x sin(56.3°) = 51.2 N

Hence, the torque applied to the pivot point P is:

Perpendicular force times rod length equals torque.

Torque equals 42.2 N x 0.333 m, or 14.07 Nm.

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Answer:

=55.21 is the answer.........

Radio waves are the types of electromagnetic waves that can be detected from a pulsar.

Thus, option B is correct

The following is not a source of outdoor air pollution : D) Household cleaning products.

Presence of one or more substances in air at concentration or for a duration above the natural level is called air pollution.

Outdoor air pollution refers to pollutants that are released into the atmosphere by sources outside of buildings or structures. The sources of outdoor air pollution can be natural or human-made. Some examples of sources of outdoor air pollution are:

A) Exhaust from cars and trucks

B) Smoke from factories and power plants

C) Pollen from trees and plants

D) Solid fuel burning

E) Forest fires

Therefore, the correct option is D) Household cleaning products.

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Note: The question given on the portal is incomplete. Here is the complete question.

Question: Sierra lives in a southwestern town in a valley where air pollutants sometimes settle. The mountains that surround the town keep air pollution from blowing away. Sometimes Sierra can actually see the pollution in the air. Which choice is NOT a source of outdoor air pollution?

A) Exhaust from cars and trucks

B) Smoke from factories and power plants

C) Pollen from trees and plants

D) Household cleaning products.

Changes in the terrain or road conditions, changes in the speed of the jeep, and external forces cause a change in motion of the jeep and a man changes the friction speed of the jeep by adjusting the amount of force applied to the brakes and the gas pedals and external factors.

a) There are several factors that can cause a change in the motion of a jeep. Firstly, changes in the terrain or road conditions such as an incline, rough surface, or gravel can affect the motion of the jeep. Secondly, changes in the speed of the jeep can also cause a change in motion, such as acceleration or deceleration. Additionally, external forces such as wind or other vehicles on the road can also impact the motion of the jeep.

b) The friction speed of a jeep can be changed by adjusting the amount of force applied to the brakes and the gas pedals. The brakes slow down the jeep by creating friction between the brake pads and the wheels, while the gas pedal increases speed by providing more power to the engine.

A driver can also change the friction speed by shifting gears or adjusting the clutch. Additionally, external factors such as the weight of the load in the jeep or the type of tires used can also affect the friction speed. It is important to note that changes in friction speed should be done safely and within the legal speed limits on the road.

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Answer: what characterizes moral development in mid to late childhood is

People at this level of moral development base their decisions on what their parents and/or law enforcement says is right. Stage 3 is about social conformity. ... Stage 4 is all about law and order for all. For example, someone may think, 'If I steal, I will break the law and breaking the law is wrong.Feb 17, 2016

Explanation:

Condense x₁ to get

sin(2πt) + cos(2πt) = √2 • (sin(2πt) + cos(2πt))/√2

… = √2 (cos(2πt) cos(π/4) + sin(2πt) sin(π/4))

… = √2 cos(2πt - π/4)

So the amplitude of x₁ is (5/2) • √2 = 5/√2, while the amplitude of x₂ is 5. The ratio between them is then 5/√2 : 5, or equivalently 1/√2 : 1 or 1 : √2.

Answer:

ok can u m a e the question make more sense like break ot down cs i wanna give u a answer but i dont really understand the question

Answer:

Siberian ibex  and Himalayan markhor

Siberian Ibex and Himalaya markor are example of species of wild goats.

The wild goat or common ibex refers wild goat species that lives in mountainous areas, forests, shrublands around Turkey and the Caucasus in the west to Turkmenistan, Afghanistan and Pakistan in the east.

They can be found in mountainous area around Africa, Asia, North America.

There are 36 Subfamily of wild goats and they have surefoot which help them to live in mountainous areas.

Therefore, Siberian Ibex and Himalaya markor are example of species of wild goats.

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