FILL IN THE BLANK. electrical devices that produce arcs when installed in volatile environments are sealed in special enclosures to prevent _____.

Responder:1,53m

Explicação: velocidade é igual a spaço sobre tempo isso dá 1,527metro por segundo

When you pick up an apple with your hand, a force is exerted on the apple. This force is a result of the interaction between the apple and your hand.

The force is generated by the friction between the apple and your hand, as your hand exerts a pushing or gripping pressure on the apple. Additionally, the force is exerted on the apple by the gravity of the Earth, as the apple is pulled down towards the ground as a result of its weight. These two forces combine to create the force exerted on the apple by your hand.

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Answer:

D

Explanation:

As the wavelength of a wave gets shorter, its frequency increases, while its energy increases. This relationship is described by the equation E = hf, where E is the energy, h is Planck's constant and f is the frequency of the wave.

The rate of change of an object's velocity concerning time is defined as acceleration. The maximum height obtained by the rocket is 486.5 meters.

The rate of change of an object's velocity concerning time is defined as acceleration. Vector quantities are accelerations.

Stated that the time for which it accelerates is 4 seconds and the net upward acceleration of 20 m/s². Thus, the maximum height the rocket reaches during the acceleration phase is,

y₀+ut+½ at² = y

0 + (0)(4) + ½ (20) (4)² = y

160 = y

Now, The velocity during the period of acceleration reached by rocket is,

v = at + u

v = (20) (4) + 0

v = 80

Thus, when the motor is switched off the maximum height the rocket reaches is,

v₀² + 2a (y − y₀) = v²

(80)² + 2(-9.8) (y − 160) = (0)²

Solving the given equation for y,

y ≈ 486.5

Therefore, The maximum height reaches by the rocket is 486.5 meters.

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Answer:

B

Explanation:

The learned behavior would have been shaped by the environment therefore C is your answer.

6 degrees Celsius make 42.8 Fahrenheit. The calculation to convert from Fahrenheit to Celsius takes the Fahrenheit temperature, subtracts 32 from it, and then multiplies the result by 5/9.

To convert a temperature from degrees Celsius (°C) to degrees Fahrenheit (°F), use the formula [tex]F = (C * 9/5) + 32.[/tex]

Therefore, to convert 6°C to Fahrenheit, we would use the following calculation:

[tex]F = (6C * 9/5) + 32[/tex]

[tex]F = (54/5) + 32[/tex]

°F = 10.8 + 32

°F = 42.8

Therefore, 6°C is equal to 42.8°F.

This conversion formula takes into account the difference between the two temperature scales, with Fahrenheit being the higher temperature scale and Celsius being the lower temperature scale.

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2.5 μC is the excess charge on the conducting sphere. The correct answer is A.

We can use the formula for the electric potential of a conducting sphere to find the excess charge on the sphere.

V = k * Q / R

where V is the potential, k is Coulomb's constant (9 × 10^9 N·m^2/C^2), Q is the excess charge on the sphere, and R is the radius of the sphere.

We can rearrange this formula to solve for Q,

Q = V * R / k

Substituting the given values,

Q = (1500 V) * (0.15 m) / (9 × 10^9 N·m^2/C^2)

Q = 2.5 × 10^-6 C

Therefore, the excess charge on the conducting sphere is 2.5 μC (microcoulombs), which corresponds to answer A.

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To convert MPa (megapascals) to ksi (kilopounds per square inch), you can use the following conversion factor: 1 MPa = 0.1450377377 ksi

The pascal is a small unit of pressure, so it is often used in combination with prefixes to express larger or smaller values. For example:

1 kPa (kilopascal) = 1000 Pa

1 MPa (megapascal) = 1,000,000 Pa

1 bar = 100,000 Pa

1 psi (pound per square inch) = 6,894.76 Pa

The pascal is used in a wide range of scientific and engineering applications, including fluid mechanics, atmospheric science, material science, and many others.

Therefore, to convert a value in MPa to ksi, you can multiply it by 0.1450377377. Here's the formula:

Value in ksi = Value in MPa x 0.1450377377

For example, if you have a pressure of 50 MPa, you can convert it to ksi as follows:

Value in ksi = 50 MPa x 0.1450377377 = 7.251886885 ksi

Therefore, 50 MPa is equal to 7.251886885 ksi (rounded to 9 decimal places).

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You can disregard the weight of the rope and assume that the rope does not stretch. Use 9.81m/s2 as the gravitational acceleration value.

The rate at which an object's velocity with respect to time changes is referred to as acceleration in mechanics. It is a vector quantity to accelerate (in that they have magnitude and direction). The direction of the net force acting on an object determines the direction of its acceleration. According to Newton's Second Law, an object's acceleration is the result of two factors working together: the object's mass, which varies depending on the materials it is made of, and the net balance of all external forces acting on it. The magnitude of an object's acceleration is inversely proportional to the object's mass.

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The formula for Hooke's Law is F = kx, where F is the force needed to move the spring, k is its constant, and x represents the movement of the spring away from its equilibrium point.

It turns out that a spring's work is calculated by taking the displacement's square, multiplying it by the spring constant, and then dividing the result by two. Force times displacement equals string potential energy. In addition, the displacement of the spring constant and the force are equal. P.E.F = -kx. The spring constant, k, is a proportional constant. It gauges how firm the spring is. Whenever a spring is crushed or stretched, It then applies a force F = -kx in the direction of its equilibrium position so that its length deviates by an amount x from that of equilibrium. As a side note, the magnitude and sign of the work done on and by springs are opposite and equal, respectively. As a result, when a spring is stretched by an external force and positive work is performed on the spring, the work performed by the spring (due to the reaction force in the spring) is negative.

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The conflict between Ethiopia and Italy in 1935-36 began with Italy's imperialist expansionist ambitions in East Africa.

In 1896, Ethiopia had successfully resisted Italian colonialism in the Battle of Adwa. However, under the rule of fascist leader Benito Mussolini, Italy sought to establish a new colonial empire and to avenge its defeat.

Italy had been planning the invasion for several years. Italy used modern weapons, including aircraft and tanks, against the poorly equipped Ethiopian forces, and after several months of fighting, Ethiopia was defeated and subsequently occupied by Italy. The war resulted in the deaths of tens of thousands of Ethiopians and Italians and had far-reaching political and economic consequences for both countries.

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--The complete question is, What events led to war between ethiopia and italy?--

The impulsive force of the car will be 4,333. Kg.m/s.

In physics, the term "impulse" is used to characterize or measure the impact of force operating gradually to alter an object's motion. It is often stated in Newton seconds or kilograms per second and is denoted by the symbol J.

given, A car with a mass of 1200kg, went from 20 km/hr to 7 km/hr.

From the general formula of impulse:

Impulsive force j = mass( initial velocity - final velocity)

In our case,

initial velocity = 20 Km/hr

Final velocity = 7 Km/hr

mass = 1200 Kg

So,

Impulsive force = 1200( 20 - 7)

impulsive force = 15600 Kg. km/hr

Since 1 km/ hr = 5/18 m/s

impulsive force = 15600 * 5 /18 Kg.m/s

impulsive force = 4,333.33  Kg.m/s

Therefore, the impulsive force of the car will be 4,333. Kg.m/s.

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The wall, floor, and countertop outlets, as well as the outlet for refrigeration equipment, must be served by the two or more 20A, 120V small-appliance branch circuits  that serve the kitchen, dining room, and other comparable rooms.

For the supply of receptacle outlets in the kitchen, pantry, dining room, and breakfast area, a minimum of three 20-amp small appliance branch circuits must be constructed.

The kitchen and other rooms connected to it, such as pantries, breakfast rooms, and dining rooms, must have two or more 20-ampere small-appliance branch circuits for every outlet.

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The velocity of the two-block system at the top of the ramp is half the initial velocity of the second block. However, the force due to gravity exerted on both blocks as they travel up the ramp is not relevant to the conservation of momentum because it is a conservative force that does not affect the total momentum of the system.

The total momentum of the system before the collision is equal to the momentum of the second block, which is given by:

p = mv0

where m is the mass of each block, and v0 is the initial velocity of the second block.

After the collision, the two blocks move together with an unknown velocity vr. The total momentum of the system after the collision is:

p' = (2m)vr

where 2m is the total mass of the two blocks, and vr is the final velocity of the system.

The conservation of momentum states that the total momentum of an isolated system remains constant, provided no external forces act on it. Therefore, the total momentum of the system before the collision is equal to the total momentum of the system after the collision:

p = p'

Substituting the expressions for p and p' gives:

mv0 = (2m)vr

Simplifying gives:

vr = v0/2

The velocity of the system can be measured to confirm that the conservation of momentum applies to the system.

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On average, the parachute with the lightest material will fall more slowly, whereas the parachute with the heaviest material will fall more quickly.

The material determines how the parachute descends, hence it is crucial that it is lightweight, flexible, and windproof. It must be able to withstand winds at high altitudes and other environmental factors. More time is required to descend with lighter materials, while less time is required to descend with heavier materials. This is the main reason why the material is essentially chosen to be lighter or less heavy.

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104 °F is equivalent to 40 °C. The conversion formula between Celsius and Fahrenheit is:

°F = (°C x 9/5) + 32 °C = (°F - 32) x 5/9

To convert 104 degrees Fahrenheit (°F) to Celsius (°C), you can use the following formula:

°C = (°F - 32) x 5/9

Plugging in the given value of 104 °F, we get:

°C = (104 - 32) x 5/9 = 72 x 5/9 = 40 °C (rounded to two decimal places)

Therefore, 104 °F is equivalent to 40 °C.

The Celsius and Fahrenheit scales are two common temperature scales used in different parts of the world. Celsius (°C) is a metric temperature scale used in most countries around the world, while Fahrenheit (°F) is a temperature scale used primarily in the United States and a few other countries.

The conversion formula between Celsius and Fahrenheit is:

°F = (°C x 9/5) + 32 °C = (°F - 32) x 5/9

To convert a temperature from Celsius to Fahrenheit, you multiply the Celsius temperature by 9/5 and add 32. To convert a temperature from Fahrenheit to Celsius, you subtract 32 from the Fahrenheit temperature and then multiply the result by 5/9.

It's important to note that Celsius and Fahrenheit have different freezing and boiling points. In Celsius, water freezes at 0°C and boils at 100°C, while in Fahrenheit, water freezes at 32°F and boils at 212°F. This means that the same temperature can have different meanings depending on the scale used.

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The steps in the evolution of a low-mass star in order will be a clump forms in a giant molecular cloud, a protostar forms, hydrogen fusion begins, the star moves onto the red giant branch, a helium flash emerges, and the star moves onto the horizontal branch.

The star shifts onto the asymptomatic giant branch, the star sheds mass, producing a nebula and the white dwarf cools. Low-mass stars spend billions of years fusing hydrogen to helium in their hearts via the proton-proton chain. They usually have a convection area and the movement of the convection zone discerns if the star has an activity analogous to the sunspot cycle on our sun. Some small stars have extremely profound convection zones. Some of these stars also rotate exceedingly fast which wrenches their magnetic fields.

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The dose equivalent limits for radiation workers are based on the radiation received from the two external and internal sources of radiation.

The dose equivalent limits for radiation workers are established by different national and international regulatory agencies, such as the International Commission on Radiological Protection and the U.S. Nuclear Regulatory Commission.

The limits are outlined to minimize the risk of radiation-induced health effects, such as cancer, while allowing for necessary exposure in various situations, such as in medical treatments or in nuclear power plants.

External sources of radiation contain radiation that comes from outside the body, such as from gamma rays or x-rays.

Internal sources of radiation, on the other hand, come from radioactive materials that are taken into the body through ingestion or inhalation.

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According to an energy bill, a client used 1027 kilowatt hours (kwh) in July. Did the customer consume the stated 1 joules = 3600 joules?

Physically, it is colorless, odorless, and a gas at ambient temperature with a weight of 1.260 g per liter under normal circumstances. It reacts with acetone and is chemically combustible, polymerizing to make polyethylene.

The following assertion about chemical and physical changes is true: C) Physiological changes always result in the creation of new substances. In nature, there are two different types of change: chemical development and physical change. No new chemicals are created, only the physicochemical characteristics of existing substances are temporarily altered.

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"For an earth satellite in circular orbit, the values that do not change are speed, gravitational force and distance from the Earth."

Although its velocity changes, its speed does not. Acceleration suggests a change in velocity but does not always imply a change in speed. An trajectory that is perfectly balanced and has a constant speed is called a circular orbit. Every turn in the circular path sees a change in orientation.

A satellite in a circular orbit is not affected by gravity's force because the force is needed to alter the satellite's direction of travel, not its speed. A satellite moves in a circular pattern with a consistent speed known as uniform circular motion.

The distance from the earth to the satellite is also constant as the satellite only moves in the fixed orbit.

Thus, for an earth satellite in circular orbit, the values that do not change are speed, gravitational force and distance from the Earth.

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The Correct answer is Option (D) 1,670 kilometers per hour.  Because,  the Earth's equatorial circumference is approximately 40,075 kilometers, and it takes 24 hours to complete one full rotation.

The subsolar point is the point on the Earth's surface where the sun is directly overhead at a given moment. This point moves along the equator due to the rotation of the Earth. In order to stay beneath the subsolar point as it moves along the equator, one would need to travel at the same speed as the Earth's rotation. Therefore, the speed of the Earth's rotation at the equator is:

40,075 km / 24 h = 1,670 km/h

Hence correct option is : D.

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The number of drops per milliliter may vary, an approximate estimate of 20 drops per milliliter is commonly used in medical and laboratory settings.

The number of drops in a milliliter (ml) depends on the size of the drop. Drops can vary in size based on factors such as the type of liquid and the method of delivery.

However, as a general approximation, it's often assumed that there are 20 drops in 1 milliliter. This estimate is commonly used in medical and laboratory settings when administering liquids such as medications, solutions, or reagents.

It's important to note that this approximation is not precise, and the actual number of drops per milliliter can vary significantly depending on the specific liquid and the conditions under which it is dispensed. Therefore, it's essential to use caution when measuring liquids by drop and to follow the specific instructions provided by the manufacturer or a trained healthcare professional.

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The airplanes have the same effective cross sectional area and drag coefficient. Then, the ratio of drag force at the two densities is 2.3.

The drag force is an air resistance which resist the motion of objects passing through air. It is related to the density ρ, drag coefficient C, velocity v and area A as follows:

D = 1/2 ρCAv².

Here, C and A are the same then the ratio of the drag forces D1 and D2 at the two densities is:

D1/D2 = ρ1 v1²/ρ2 v2²

ρ1  = 0.38 kg/m³

ρ2 = 0.67 kg/m³

v1 = 1000 km/h

v2 = 500 km/h

Then the ratios of drag force is ;

D1/D2 =  0.38 kg/m³ × 1000 km/h / (0.67 kg/m³ × 500 km/h)

          = 2.3

Therefore, the ratio of drag force at the two densities is 2.3.

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The equation to find the equivalent resistance, Req, of two resistors in series, R1 and R2 is option (a) Req = R1 + R2

The equation to find the equivalent resistance of two resistors in series is simply the sum of their individual resistances. This is because the voltage across each resistor in series is the same, and so the current flowing through each resistor is proportional to its resistance. By Ohm's Law, the voltage across each resistor is equal to the current multiplied by the resistance, so the total voltage drop across both resistors is the sum of the individual voltage drops. Therefore, the total resistance of the two resistors in series is equal to the sum of their individual resistances:

Req = R1 + R2

This equation applies only to resistors in series, where the current flows through one resistor and then through the other, with no other components in between.

Therefore, the correct option is (a) Req = R1 + R2

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The mass of the box is approximately 0.48 kg which can be calculated by using work-energy principle if work is given.

To solve this problem, we can use the work-energy principle, which states that the work done on an object is equal to the change in its kinetic energy.

In this case, the forklift raises the box a height of 1.2 m, so the change in potential energy of the box is given by:

ΔPE = mgh

where m : mass of the box, g : acceleration due to gravity (9.8 m/s²), and h : height to which the box is raised (1.2 m).

Work done:

W = 7.0 kJ

Use work energy principle:

W = ΔPE

7.0 kJ = mgh

Put values:

m = [tex]7.0 kJ / (g * h) = 7.0 kJ / (9.8 m/s^{2} * 1.2 m) = 0.48 kg[/tex]

Therefore, the mass of the box is approximately 0.48 kg.

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Answer:

Explanation:

1) in order to convert from pounds to newtons we first must convert pounds to kilograms using the conversion factor 1 kg = 2.2 lb

2) then we can use the formula fore force F = M * G where F is force in Newtons M is Mass in kg and G is the acceleration of earths gravity (9.8m/s/s).

Ex) lets say we have 5 lb. Fore every 2.2 lb we have 1 kg so we divide

5 lb by 2.2 lbs an get that 5 lb = 2.5 kg. now we plug this into the our force equation and get F = 2.5 * 9.8

F = 24.5 Newtons

The bright star that will be straight overhead at midnight on june 20 will be Vega.

option D.

To determine the answer to this question using a star wheel, you will need to know your latitude and the local time of the observation. Assuming you are located in the northern hemisphere and at a latitude of about 40 degrees, and that the local time is set to midnight on June 20, the star that will be straight overhead will be Vega.

To use a star wheel, first set the date to June 20 and align the wheel with your local time (midnight in this case). Next, find the altitude (height above the horizon) of the stars located at the center of the wheel (i.e. the stars that are closest to the center point).

The star with the highest altitude will be the one closest to being straight overhead. In this case, Vega will be the brightest star closest to the center point, so it will be the one closest to being straight overhead at midnight on June 20.

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The complete question is below:

What bright star will be straight overhead at midnight on June 20? (Using your star wheel)

A) Sirius

B) Arcturus

C) Capella

D) Vega