A 5.45-m radius air balloon loaded with passengers and ballast is floating at a fixed altitude. Determine how much weight (ballast) must be dropped overboard to make the balloon rise 106 m in 21.5 s. Assume a constant value of 1.2 kg/m3 for the density of air. Ballast is weight of negligible volume that can be dropped overboard to make the balloon rise.

To calculate the current in a circuit, we can use Ohm's Law, which states that the current (I) flowing through a circuit is equal to the voltage (V) divided by the resistance (R). So, in this case, the current would be:

I = V / R

I = 9.0V / 5.00 ohms

I = 1.8 A

So, 1.8 A of current would flow in a closed circuit that has a 9.0V battery and 5.00 total resistance.

Answer:

a)   v² = v₀² + 2 g h,  b)   t = v₀/g  (1+ √ (1 + 2gh/ v₀²))

Explanation:

a) This is an exercise that we can solve using conservation of energy.

Starting point. High point

         Em₀ = K + U = ½ m v₀² + m gh

Final point. Soil

         \(Em_{f}\) = K = ½ m v²

energy is conserved because there is no friction

         Emo = Em_{f}

         ½ m v₀² + m g h = ½ m v²

         v² = v₀² + 2 g h

b) the time it takes to reach the ground can be calculated with kinematics

let's create a reference frame with positive upward direction

         v = vo - g t

when it reaches the ground it has a velocity v, the initial velocity is downwards v₀ = -v₀

        v = -v₀ - gt

        t = - (v + v₀) / g

we substitute the velocity values ​​calculated in the previous part

        t = - (√(v₀² + 2 g h) + vo) / g

we will simplify the equation a bit

        t = - v₀/g  (1+ √ (1 + 2gh/ v₀²))

c) is now thrown vertically upward with the same initial velocity vo.

   To find the final velocity we use the conservation of energy where the velocity is squared, so it does not matter if it is positive or negative, therefore in this section the value should be the same as in part a

         v = √ (v₀² + 2gh)

d) for this part if there is change since the speed is not squared

     v₀ = v₀

          v = v₀ - gt

          t = (v₀ - v) / g

          t = (v₀ - √(v₀² + 2 g h)) / g

          t = v₀/g   (1 - √(1 + 2gh / v₀²))

Answer:

Explanation:

I'm not 10% sure but i think that if you were to do:

603 + 277 = 880

1000 - 880 = 120

So to keep it from moving, i think you would need to pull with a force of 120N

The force with which it should be pulled to keep the knot from moving is 663.58 N.

Newton's third law states that, for every action, there is an equal and opposite reaction.

Here,

Force exerted by Roberta, F₁ = 277 N

Force exerted by Michael, F₂ = 603 N

Since, Roberta is pulling to the west and Michael is pulling towards the south, the angle between the forces applied by them is 90°.

The force needed to keep the knot from moving is the resultant force of these two forces.

Therefore, the resultant force,

Fₙ = √F₁² + F₂²

Fₙ = √(277)² + (603)²

Fₙ = 663.58 N

Hence,

The force with which it should be pulled to keep the knot from moving is 663.58 N.

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Answer:

Fritional force

Explanation:

Fritional force is a force that always opposes the motion of an object and is frequently ignored

C

Explanation:

Applied force, air resistance

The Enron scandal drew attention to accounting and corporate fraud as its shareholders lost $74 billion in the four years leading up to its bankruptcy, and its employees lost billions in pension benefits.

Enron's Board of Directors failed to fulfil its fiduciary duties towards the corporation's shareholders. Secondly, the top executives of Enron were greedy and acted in their own self-interest.

Enron's downfall was attributed to its reckless use of derivatives and special purpose entities. By hedging its risks with special purpose entities which it owned, Enron retained the risks associated with the transactions. This arrangement had Enron implementing hedges with itself.

Enron raised fundamental issues about corporate fraud, accounting transparency, and investor protection.

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The velocity of the drum after the collision with a lorry of 2000 kg mass is determined as 1,280 km/h.

The velocity of the drum after the collision is calculated by applying the principle of conservation of linear momentum as follows;

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

where;

The velocity of the drum after the collision is calculated as;

2000 (50) + 25(0) = 2000(34) + 25v₂

100,000 = 68,000 + 25v₂

25v₂ = 32,000

v₂ = 32,000/25

v₂ = 1,280 km/h

Thus, the final velocity of the drum after the collision is calculated by applying the principle of conservation of linear momentum.

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The velocity of the drum after the collision, given that a 2000 kg lorry moving with a speed of 50 Km/h collides with it, is 1280 Km/h

The following data were obtained from the question given above:

The law of conservation of linear momentum states as follow:

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

Inputting the given parameters, the velocity of the drum after the collision can be obtain as follow:

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

(2000 × 50) + (25 × 0) = (2000 × 34) + (25 × v₂)

100000 + 0 = 68000 + 25v₂

Collect like terms

25v₂ = 100000 - 68000

25v₂ = 32000

Divide both sides by 25

v₂ = 32000 / 25

v₂ = 1280 Km/h

Thus, the velocity of the drum after collision is 1280 Km/h

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90.1 g of ice are still present in the container. Calculating the heat received by the ice to melt and the heat lost by the tea is necessary until it reaches an equilibrium temperature of 33.1 ◦C .

Consider how much energy is required to melt one kilogramme of ice at zero degrees to produce one kilogramme of water at zero degrees. The energy required to melt one kilogramme of ice is determined by Q = mLf = (1.0 kg)(334 kJ/kg) = 334 kJ using the equation for a change in temperature.

In order to calculate how much heat is gained by the ice melting, we must first calculate how much heat is lost by the tea as it cools from 33.1 °C to 0.0 °C.

Tea loses the following amount of heat: q1 = m1CT1 = 0.185 kg) (4186 J/kg C) (33.1 C - 0.0 C) = 26298.93 J.

Heat required for ice to melt is given by the formula: q2 = m2Hf = (0.0903 kg)(333.55 kJ/kg) = 30062.56 J

We may set q1 = q2 to get the mass of ice still present because the system is in thermal equilibrium:

m2 = q2/Hf = 333.55 kJ/kg / 30062.56 J = 0.0901 kg

Finally, we round the mass to two significant digits and convert it to grammes:

m2 = 90.1 g

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Answer: \(3000\ W,\ 78,000\ J\)

Explanation:

Given

The voltage of the battery is \(V=12\ V\)

Current through the battery is \(I=250\ A\)

(a) Power is the product of voltage and current

Power dissipates is given by

\(P=VI\\P=12\times 250\\P=3000\ W\)

(b) Energy delivered

\(E=P\times t\)

\(E=3000\times 26\\E=78,000\ J\)

Approximately 18% of girls and 24% of males in the United States smoke as of 2019, according to the Centers for Disease Control and Prevention (CDC).

In general, men are more likely than women to use any type of tobacco product. 15.6% of adult females and 16.7% of adult males smoked cigarettes in 2015. These variations could be attributed to a mix of biological (especially ovarian hormones), cultural, and behavioural elements.

India is the nation with the second-highest number of tobacco smokers in the world with 267 million users (behind China). There are about 100 million smokers in the world today who are over the age of 15. (cigarettes and bidis).

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Question:

"In the United States, about what percentage of females and what percentage of males smoke?

a. 15%; 30%

b. 18%; 24%

c. 26%; 21%

d. 30%; 30%"

Answer: question one: i cannot tell      Question 2: waxing crescent        Question 3:  waxing gibbous     Question 4:    B

Explanation

Answer:

First one is hydrogen and oxygen

Second one is color change, solid dissolves, and temperature increases

Explanation:

Electrolysis is the process of using electricity to decompose water into hydrogen and oxygen.

Odors and change of states are physical changes while the rest are chemical changes.

Hope this helped!

Answer:

C) The book's inertia carried it forward.

When the bus stops suddenly, the book tends to remain in motion due to its inertia. The book was at rest on the seat of the bus, and when the bus stopped suddenly, the book continued moving forward with the same speed and direction it had before the bus stopped. As a result, the book slid off the seat and onto the floor.

To construct a semi-ellipse fireplace arch with a height of 2 feet and a base width of 6 feet, the contractor can use the following steps:

Determine the center point of the arch. Mark this point on the floor and call it point C.Measure the height of the arch, which is 2 feet. Mark this point above point C and call it point A.Measure the base width of the arch, which is 6 feet. Mark two points on either side of point C at a distance of 3 feet each. Call these points B and D.

Tie a string to a tack at point A, and loop it around two more tacks at points B and D.Adjust the length of the string until it is taut, but not too tight.Using a pencil, trace the curve of the string from point B to point D. This will create the semi-ellipse shape.

The required positions of the tacks and the length of the string will depend on the specific measurements and dimensions of the fireplace arch. By following these steps, the contractor can ensure that the semi-ellipse fireplace arch is constructed accurately and meets the desired specifications.

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Answer:

Volume of metal piece = 0.0069 m³ (Approx.)

Explanation:

Given:

Weight of metal in air = 300 N  

Weight of metal in water = 232.5 N

Find:

Volume of metal piece

Specific gravity of metal

Computation:

We know that;

Density of water = 1,000 kg/m³

Buoyant force applied on metal piece = Weight of metal in air - Weight of metal in water

Buoyant force applied on metal piece = 300 N - 232.5 N

Buoyant force applied on metal piece = 67.5 N

Buoyant force = Volume of metal x Density of water x Gravitational force

67.5 = Volume of metal x 1,000 x 9.8

Volume of metal piece = 0.0069 m³ (Approx.)

The block accelerates down the ramp due to the component of its weight that acts parallel to the ramp; this force has magnitude

(100 kg) g sin(26.6°) ≈ 438 N

(Note that the positive sign here means we take "down the ramp" to be the positive direction.)

Since the ramp is frictionless, this is the only force acting on the block in this direction. By Newton's second law, the block's acceleration is a such that

438 N ≈ (100 kg) a   ⇒   a ≈ 4.38 m/s²

The block accelerates uniformly, so that it attains a speed v as it moves 50 m such that

v² = 2a (50 m)

Solve for v :

v = √(2a (50 m)) ≈ 20.9 m/s

The total resistance of the circuit is 49 Ω. The current strength in the circuit, when connected to a voltage source of 56 V, is approximately 1.14 A.

To calculate the total resistance of the circuit, we need to determine the equivalent resistance of the resistors connected in a series.

Given:

R1 = 4 Ω

R2 = 30 Ω

R3 = 10 Ω

R4 = 5 Ω

Calculate the equivalent resistance (RT) of R1 and R2, as they are connected in series:

RT1-2 = R1 + R2

RT1-2 = 4 Ω + 30 Ω

RT1-2 = 34 Ω

Calculate the equivalent resistance (RTotal) of RT1-2 and R3, as they are connected in parallel:

1/RTotal = 1/RT1-2 + 1/R3

1/RTotal = 1/34 Ω + 1/10 Ω

1/RTotal = (10 + 34) / (34 * 10) Ω

1/RTotal = 44 / 340 Ω

1/RTotal ≈ 0.1294 Ω

RTotal ≈ 1 / 0.1294 Ω

RTotal ≈ 7.74 Ω

Calculate the equivalent resistance (RTotalCircuit) of RTotal and R4, as they are connected in series:

RTotalCircuit = RTotal + R4

RTotalCircuit = 7.74 Ω + 5 Ω

RTotalCircuit ≈ 12.74 Ω

Therefore, the total resistance of the circuit is approximately 12.74 Ω.

To determine the current strength (I) when connected to a voltage source of 56 V, we can use Ohm's Law:

I = V / RTotalCircuit

I = 56 V / 12.74 Ω

I ≈ 4.39 A

Therefore, the current strength in the circuit, when connected to a voltage source of 56 V, is approximately 4.39 A (or 1.14 A, considering significant figures).

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Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

\(k = \frac{1}{2} m {v}^{2} \\ \)

m is the mass

v is the velocity

From the question we have

\(k = \frac{1}{2} \times 1200 \times {40}^{2} \\ = 600 \times 1600\)

We have the final answer as

Hope this helps you

Answer:

get good

Explanation:

get good

djhdhdhdjdusigxig 9gc

Answer:

I think A is correct.

Explanation:

If it's not I'm sorry probably my fault but I hope this helps:)

The most common type of hydroelectric power plant is an impoundment facility. An impoundment facility, typically a large hydropower system, uses a dam to store river water in a reservoir. Water released from the reservoir flows through a turbine, spinning it, which in turn activates a generator to produce electricity.

"A turbine is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work." The work produced by a turbine can be used for generating electrical power when combined with a generator.

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Answer:

Infrared photons carry lower radiation energy than the visible light.

Explanation:

       \(E = h*\nu (1)\)

Infrared photons carry lower radiation energy than the visible light.

Visible light is the section of the spectrum of electromagnetic radiation which are visible to human eyes. The wavelength range of this light varies from 400 nm to 700 nm .

Each photon carries an energy that is directly proportional to its frequency, being this proportionality constant the Planck's constant h.

So, we can write the energy of a single photon as follows:

\(E=h\nu\)      

Since there exists an inverse relationship between wavelength and frequency, and infrared radiation has longer wavelengths, this means that its frequency is lower than the one of the visible light.

So, an infrared photon carries less energy than one of the visible light.

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The displacement of the train after 2.23 seconds is 25.4 m.

The resultant velocity of the train is calculated as follows;

R² = vi² + vf² - 2vivf cos(θ)

where;

R² = 8.81² + 9.66² - 2(8.81 x 9.66) cos(76)

R² = 129.75

R = √129.75

R = 11.39 m/s

The displacement is calculated as follows;

Δx = vt

Δx = 11.39 m/s x 2.23 s

Δx = 25.4 m

Thus, the displacement of the train after 2.23 seconds is 25.4 m.

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The required volume of the plastic bin with the respective unit would be 619.65 cubic cm.

The volume of a cuboid is equal to the product of the length, width, and height of a cuboid.

The volume of a cuboid is length × width× height

Width (W) = 9.0 cm

Length (L) = 15.3 cm

Height (H) = 4.5 cm

As it is 3D geometry

The equation of volume will be L×W×H

The volume of the plastic bin = 15.3 ×9.0 × 4.5

The volume of the plastic bin = 619.65 cubic cm.

Therefore, the volume of the plastic bin would be 619.65 cubic cm.

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i) The initial deceleration of the car is -1.6 m/s² and  the time taken is 5 seconds

ii) The final deceleration is -1 m/s²

iii) The total dispalcement = 1016 m

The initial deceleration of the car is given by the formula below:

v² = u² + 2as

where;

Solving for a;

12² = 20² + 2 * a * 80

a = -1.6 m/s²

Time taken, t = v - u / a

t = 12 - 20 / (-1.6)

t = 5 seconds

Final deceleration:

a = v - u / t

a = 0 - 12 / 12

a = -1 m/s²

iii) Displacement at constant velocity = 12 * 1 * 60

Displacement at constant velocity = 720 m

Final displacement, s = ut + 0.5at²

s = 12 * 12 + 0.5 * 1 * 12²

s = 216 m

Total dispalcement = 80 + 720 + 216

Total dispalcement = 1016 m

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Answer:

sink hole, water table decrease ,and salt water intrusion

Answer:

pls give brainliest

Explanation:

sink hole,water table descrese and salt water intrusion

Answer:

itan it is much further from the sun, so the transformation of Carbon into 14 carbon is very small, so there is no process that changes the relationship between ¹⁵N/¹⁴N,

Explanation:

If the relationship between ¹⁵N and ¹⁴N is different on Earth and titan, they indicate that the relationship is higher in casino.

The first thing to clarify that this transformational is due to changes at the nuclear level.

Specifically carbon by incidence of cosmic rays from the sun forming ¹⁴C, this atom is unstable and decays after its life span of 5730 years in ¹⁴N, on Earth it is much closer to the Sun so the amount of cosmic rays is much greater therefore the amount of nitrogen atom 14 increases whereby the ratio between the two isotopes of nitrogen decreases.

In the case of Titan it is much further from the sun, so the transformation of Carbon into 14 carbon is very small, so there is no process that changes the relationship between ¹⁵N/¹⁴N, The reactionary from Saturn is fundamentally in infrared that does not have energy to change the nuclear structure of the coal.

For which the most likely explanation is the absence of means to transform carbon into carbon 14  by the remoteness of Titan from the Sun