Technetium‑99m, an important radionuclide in medicine, has a half‑life of 6.0 hours. What percentage of a sample of technetium‑99m will remain undecayed after each of the given times?

Answer:

it is 15

Explanation:

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Answer:

A. rocky orbiting object

Answer:

A rocky orbiting object.

i hope it's helpful

Answer:

Explanation:

To calculate the amount of heat needed to increase the temperature of 150 grams of water from 25 degrees Celsius to 55 degrees Celsius, we can use the formula: Q = mcΔT, where Q is the amount of heat, m is the mass of the substance (in this case, water), c is the specific heat capacity of water, and ΔT is the change in temperature.

First calculate the change in temperature:ΔT = (final temperature) - (initial temperature)ΔT = (55°C) - (25°C)ΔT = 30°C.

Now, we can use the specific heat capacity of water, which is 4.184 J/g°C, to calculate the amount of heat needed: Q = mcΔTQ = (150 g) x (4.184 J/g°C) x (30°C)Q = 18828 J.

Therefore, the amount of heat needed to increase the temperature of 150 grams of water from 25 degrees Celsius to 55 degrees Celsius is 18,828 J.

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Answer:

True

Explanation:

idk

The filling time of the gas tank can be determined by considering the relationship between the volume of the tank and the discharge rate of gasoline.

To find the filling time, we need to determine how long it takes for the nozzle to discharge enough gasoline to fill the entire tank.

First, let's consider the units involved. The volume of the tank is given in liters (l) and the discharge rate of gasoline is given in liters per second (l/s).

The filling time can be calculated by dividing the volume of the tank (v) by the discharge rate (v˙):

Filling time = v / v˙

For example, let's say the volume of the tank is 50 liters and the discharge rate is 5 liters per second. The filling time would be:

Filling time = 50 l / 5 l/s = 10 s

So it would take 10 seconds to fill the tank in this example.

In summary, the correct relation for the filling time in terms of the volume of the tank (v) and the discharge rate of gasoline (v˙) is given by the formula: Filling time = v / v˙.

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A typical AC brushless alternator/generating system used on a modern large aircraft usually uses two magnetic fields to make the system work: a rotor magnetic field and a stator magnetic field.

The rotor magnetic field is produced by a set of permanent magnets or an electromagnetic field generated by direct current (DC) fed to the rotor windings, while the stator magnetic field is produced by three-phase alternating current (AC) fed to the stator windings.

The relative motion between the rotor and stator magnetic fields induces an AC voltage in the stator windings, which is rectified and regulated to produce a DC voltage for the aircraft's electrical systems.

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The equilibrium constant (Keeq) for a reaction at 25 °C can be calculated using the equation  Keeq = e^(−ΔG°/RT)

The equilibrium constant (Keeq) for a chemical reaction can be calculated using the equation Keeq = e^(−ΔG°/RT), where ΔG° represents the standard free-energy change, R is the gas constant, and T is the temperature in Kelvin.

In this case, the given standard free-energy change is −12.50 kJ mol−1 (−2.988 kcal mol−1). To calculate the equilibrium constant at 25 °C, we need to convert the temperature to Kelvin by adding 273.15 (25 °C + 273.15 = 298.15 K). Then, we substitute the values into the equation to find the equilibrium constant.

Keeq = e^(−12.50 kJ mol−1 / (8.314 J K−1 mol−1 × 298.15 K))

By evaluating the expression, we can determine the equilibrium constant (Keeq) for the given reaction at 25 °C.

The relationship between standard free-energy change and equilibrium constant in chemical reactions to understand the thermodynamic aspects of chemical equilibria

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The following options accurately describe ways to test the implications of the hypothesis that the battery needs to be charged:

The following options describe ways to test the hypothesis that the battery needs to be charged:

In summary, options 2 and 3 are valid ways to test the hypothesis that the battery needs to be charged, while options 1 and 4 do not involve any testing of the hypothesis.

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The wavelength of an electromagnetic wave can be calculated using the formula λ = c/f, where λ is the wavelength, c is the speed of light (approximately 3.00 x 108 m/s), and f is the frequency.

Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as temporal frequency for clarity and to distinguish it from spatial frequency. Frequency is measured in hertz (Hz), which is equal to one event per second. Ordinary frequency is related to angular frequency (in radians per second) by a scaling factor of 2.

For a frequency of 5.00 x 10^19 Hz, the wavelength can be calculated as follows:
λ = (3.00 x 10^8 m/s) / (5.00 x 10^19 Hz)
λ ≈ 6.00 x 10^-12 meters.
Therefore, the wavelength of the electromagnetic waves in free space with a frequency of 5.00 x 10^19 Hz is approximately 6.00 x 10^-12 meters.

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The length of the spring extension in the centimeters, when a 40-gram object is attached to the spring would be 13.2  cm, therefore the correct answer is the option B

The spring constant is used to define the stiffness of the spring, the greater the value of the spring constant stiffer the spring and it is more difficult to stretch the spring.

The mathematical relation for calculating the spring constant is as follows

F = - Kx

As given in the problem there is a linear relationship between mass and the length of the spring extension

20 gram ⇒ 6.6 centimeters

50 grams ⇒ 16.5 centimeters

The constant of the proportionality is the spring constant as the acceleration due to gravity is assumed to be constant

K = 20/6.6 =50/16.5 = 3.03

K = 3.03

Similarly, for a 40-gram mass, the extension of the spring would be

Extension length = 40/3.03

                            = 13.2 centimeters

Thus, when a 40-gram object is attached to the spring would be 13.2 cm  therefore the correct answer is the option B

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Newton, There will be mass is 4.080, So acceleration will be equals to 2.50 m per cent in the square.

The crate’s acceleration is 0 since its velocity is constant. As a result, the total of the forces equals zero. Because the forces resist each other, the lifting force must be equal to the weight of the item. The magnitude of the upward force on the container is thus 490.5 Newtons.

The amount of force is expressed as mass times length times time squared. The most common metric unit is the newton (N), which is defined as one kilogram times one meter over one second squared. Magnitude – Distance Formula – used to calculate the connection between apparent magnitude, absolute magnitude, and object distance.

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The force of the SUV's bumper on the truck's bumper would be 18,000 N.

The bumper on the truck is pushing the bumper of the SUV, which is acting as a reaction force back on the truck's bumper. According to Newton's Third Law, if the truck applies a forward force to the SUV, the SUV will apply an equal and opposite force back on the truck. Therefore, at this acceleration the force of the SUV's bumper on the truck's bumper would be the same as the forward force applied by the truck, which is 18,000 N.This is because the two vehicles are in contact with each other, so the force applied by one is equal and opposite to the force applied by the other.

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The crankshaft completes one complete 360-degree rotation for each of the four equal strokes that make up the cycle. Every stroke of a camshaft involves a full rotation of 90 degrees.

In essence, the internal combustion engine's crankshaft serves as its support structure. The crankshaft is in charge of turning a linear motion into a rotational motion and ensuring that the engine runs properly.

If the engine is knocking or has low oil pressure, you should take note of it (from a gauge or warning light). When things become bad enough, the engine will just quit. Immediately stop your automobile and turn off the engine if you see any of these symptoms.

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According to the given statement:

The entropy change of this rivet is  -0.245 kJ/K.

The correct option is B.

Entropy change is a phenomenon that quantifies how disorder or randomness has changed in a thermodynamic process. It has to do with the heat or enthalpy conversion that occurs during work. More randomness indicates a high entropy in a thermodynamic system.

A substance's entropy rises when it is divided into several components. Entropy is increased during the dissolution process because the solute become kept separate from each other when a solution is created. As temperature increases, entropy rises as well.

When the TDS equation is simplified for this circumstance and integrated, the outcome is:

Temperature1 =  800 k

Temperature2 =  300 k

Mass =   0.5-kg steel

the formula of entropy change:

S2 - S1= mC

(T2 / T1) = 0.5 (0.5)

(300 / 800) = -0.245 kJ/K.

The entropy change of this rivet is  -0.245 kJ/K.

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The expression (sqrt(5) + 2)(4 - sqrt(5)) simplifies to 2sqrt(5) + 3.

To evaluate the expression using the FOIL method, we need to multiply the first terms, outer terms, inner terms, and last terms.

The expression is (sqrt(5) + 2)(4 - sqrt(5)).

First, multiply the first terms: sqrt(5) * 4 = 4sqrt(5).

Next, multiply the outer terms: sqrt(5) * -sqrt(5) = -5.

Then, multiply the inner terms: 2 * 4 = 8.

Lastly, multiply the last terms: 2 * -sqrt(5) = -2sqrt(5).

Now, combine the like terms: 4sqrt(5) - 5 + 8 - 2sqrt(5).

Simplify the expression: 4sqrt(5) - 2sqrt(5) - 5 + 8.

Combine the like terms again: (4 - 2)sqrt(5) + 3.

Finally, simplify further: 2sqrt(5) + 3.

Therefore, the expression (sqrt(5) + 2)(4 - sqrt(5)) simplifies to 2sqrt(5) + 3.

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In the peak of summer, it hasn't rained in a week, and the plants are looking rough, so watering the plants for an hour is a good idea.

However, the next day, you come back to the garden, and the plants look in worse shape than they did previously, as if none of that water made it to the plant. Plants absorb water through their roots. The root system of a plant is responsible for drawing water and nutrients from the soil. A plant's root system must be able to absorb water quickly in order for the plant to grow and thrive. When the soil around the root system is dry, the roots will stop growing and will not be able to absorb water.

It may even start to die. Watering plants during the peak of summer is important because it will help keep the soil moist and prevent the roots from drying out. However, watering a plant too much can be harmful. If a plant is overwatered, the water may not be able to penetrate the soil and reach the roots. Instead, it may just sit on top of the soil, causing the roots to rot and die. This can cause the plant to wilt and die.To summarize, if the soil around the plant is too dry, the roots may not be able to absorb the water you gave them, causing the plant to look worse than before. Conversely, overwatering can also be harmful because the water may not be able to penetrate the soil and reach the roots, causing the roots to rot and die.

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The given series, 1 + 7n Σ 57 n = 1, is divergent because the terms in the series continue to increase without bounds, the sum of the series also increases indefinitely.

To determine the convergence or divergence of the series, we can analyze its behaviour as n approaches infinity. The series can be written as Σ(1 + 7n*57) for n = 1 to infinity. By simplifying the expression, we have Σ(399n + 1) for n = 1 to infinity.

As n increases, the summand of the series grows linearly with a coefficient of 399. Since the coefficient is nonzero and positive, the series will diverge. This means that the sum of the series will not approach a finite value as n tends to infinity.

Therefore, the given series is divergent, and we cannot find its sum. It is important to note that a divergent series does not have a finite sum. Therefore, the sum of the given series is "DIVERGES."

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Complete Question:

A coin is dropped off of a building landing on its side. It hits with a pressure of 400 N/m². It hits with a force of 0.1N. Calculate the area of the coin?

Answer:

Area = 0.00025 m²

Explanation:

Given the following data;

Pressure = 400N/m²

Force = 0.1N

To find the area of the coin;

Pressure = Force/area

Area = Force/pressure

Substituting into the equation, we have;

Area = 0.1/400

Area = 0.00025 m²

ice-making machines are the same as ice-holding machines such as those seen on the outside of a convenience store or service station. this statement is false

Ice-holding machines are not the same as ice-making equipment. As the name implies, ice-making devices are made to make ice. To produce ice cubes or crushed ice, they employ a variety of technologies, such as freezing water or using refrigeration methods.

On the other hand, pre-made ice is stored and distributed using ice-holding machines, which are often situated outside of convenience shops or gas stations. These devices don't make ice; instead, they keep a supply of it on hand for consumers to buy or use.

Ice-making machines make ice, whilst ice-holding machines store and disperse pre-made ice. Despite having a connection to ice, these devices have different functions.

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Explanation:

The symbols of the first diagram is above

For the second question I can't see the whole diagram

The maximum speed of the electrons in the evacuated tube is approximately 5.43 x 10^7 m/s.

Define Kinetic energy ?

Kinetic energy is the energy that an object possesses due to its motion. It is defined as the energy required to accelerate an object of a certain mass from rest to a particular velocity. The amount of kinetic energy that an object has depends on its mass and its velocity.

The mathematical formula for kinetic energy is:

\(KE = 1/2 mv^2\)

where KE is the kinetic energy, m is the mass of the object, and v is its velocity.

Given by the question:

To find the maximum speed of the electrons in the evacuated tube, we can use the equation for the maximum kinetic energy of an electron accelerated through a potential difference:

\(Kmax = eV\)

where Kmax is the maximum kinetic energy of the electron, e is the charge of the electron, and V is the accelerating voltage.

Since the electrons are non-relativistic, we can use the classical equation for kinetic energy:

\(Kmax = 1/2 mv^2\)

where m is the mass of the electron and v is its velocity.

Setting these two equations equal to each other and solving for v, we get:

\(1/2 mv^2 = eV\)

\(v^2 = 2eV/m\)

\(v =\sqrt{(2eV/m)}\)

Plugging in the values given:

\(v=\sqrt{(2 * 1.602 x 10^-19 J * 46,000 V / 9.109 x 10^-31 kg)}\)

\(v = 5.43 x 10^7 m/s\)

Therefore, the maximum speed of the electrons in the evacuated tube is approximately 5.43 x 10^7 m/s.

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Answer:

Explanation:

When a substance is heated the average kinetic energy of molecules increases and they start moving with an increased speed.As a result between mean separation between the molecules also increases

The distance from the sun where the intensity of sunlight is 1/64th of the intensity at the earth is 8 astronomical units.

To calculate the distance from the sun where the intensity of sunlight is 1/64th of the intensity at the earth, we can use the inverse square law of radiation. This law states that the intensity of radiation is inversely proportional to the square of the distance from the source.
Therefore, we can set up the equation:
(1/64) * Iearth = Isun at distance x from the sun
Where Iearth is the intensity of sunlight at the earth and Isun is the intensity of sunlight at a distance x from the sun.
Using the inverse square law, we can write:
Isun at distance x = Iearth * (1 au / x)^2
Substituting this expression into our equation above, we get:
(1/64) * Iearth = Iearth * (1 au / x)^2
Simplifying, we get:
x^2 = 64 au^2
Taking the square root of both sides, we get:
x = 8 au
Therefore, the distance from the sun where the intensity of sunlight is 1/64th of the intensity at the earth is 8 astronomical units.

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The vertical forces cancel, so only the horizontal forces are included in the net force. If the right is positive and the left is negative, then

50 N + (-20 N) = 30 N

so the net force is (B) 30 N to the right.

Answer:

(B) 30 N to the right.

Explanation:

Answer:

3875J

Explanation:

Energy is defined as the power × time

And it's defined as

Power = IV - I- current and V- voltage

Now quantity of electricity; Q = I × t

Where I is current and t is time

Now Energy = I ×V×t = V× I×t = V× Q;

where Q is quantity of electricity 775C and V is 5.0volt

Hence 775 × (5) =3875J

Answer:

1.33

Explanation:

Apparent Depth = 1.0m

Real Depth = x

Refractive Index = 1.33

n = r.d/a.d

1.33 = x/1

x = 1.33 x 1

1.33

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