The air temperature is 70 degrees, and the relative humidity is 90%. Which conclusion can be made?(1 point)

The air holds little water vapor and is relatively dry.

The amount of water vapor in the air is 90% of what the air can hold.

The dew point temperature is 90% of the air temperature.

The temperature must rise in order for air to become saturated with water vapor.

Answers

Answer 1

Answer:

The amount of water vapor in the air is 90% of what the air can hold.

Explanation:

The answer is A

Answer 2

Answer: The answer is B: The amount of water vapor in the air is 90% of what the air can hold      


Related Questions

A lawn mower is pushed with a force of 79 N. If 11,099 J of work are done on mowing the lawn, what is the total distance the lawn mower was pushed? Round your answer to a whole number (no decimal places).

Answers

Answer:

141m

Explanation:

A particle is revolving in a circle with increasing its speed uniformly.​

Answers

Tangential acceleration is constant because speed along the circular path increases uniformly. ... Only constant acceleration will give uniform increase of speed.

A CD player spins at 8590rpm. If it starts from rest and has an acceleration of 450rad/s² how long does it take to reach full speed?​

Answers

Answer:

ਹੈਲੋ, ਇੰਡੀਆ ਦਾ ਆਪਣਾ ਵੀਡੀਓ ਐਪ - ਰੋਪੋਸੋ ਤੇ Manjeet Warval ਦਾ ਵੀਡੀਓ ਦੇਖੋ | ਨਾਲ ਹੀ PM ਮੋਦੀ ਦੇ 'ਵੋਕਲ ਫ਼ਾਰ ਲੋਕਲ' ਮੋਹਿਮ ਨੂੰ ਸਫ਼ਲ ਬਣਾਉਣ ਲਈ ਰੋਪੋਸੋ ਤੇ 5 ਕਰੋੜ ਤੋਂ ਜ਼ਿਆਦਾ ਭਾਰਤੀਆਂ ਦੇ ਨਾਲ ਜੋੜੋ| ਹੁਣੇ ਰੋਪੋਸੋ ਐਪ ਡਾਊਨਲੋਡ ਕਰੋ ਅਤੇ 100 ਕੋਇਨਜ਼ ਪਾਣ ਲਈ 24 ਘੰਟੇ ਦੇ ਅੰਦਰ ਸਾਇਨ ਅੱਪ ਕਰੋ|ਹੈਲੋ, ਇੰਡੀਆ ਦਾ ਆਪਣਾ ਵੀਡੀਓ ਐਪ - ਰੋਪੋਸੋ ਤੇ Manjeet Warval ਦਾ ਵੀਡੀਓ ਦੇਖੋ | ਨਾਲ ਹੀ PM ਮੋਦੀ ਦੇ 'ਵੋਕਲ ਫ਼ਾਰ ਲੋਕਲ' ਮੋਹਿਮ ਨੂੰ ਸਫ਼ਲ ਬਣਾਉਣ ਲਈ ਰੋਪੋਸੋ ਤੇ 5 ਕਰੋੜ ਤੋਂ ਜ਼ਿਆਦਾ ਭਾਰਤੀਆਂ ਦੇ ਨਾਲ ਜੋੜੋ| ਹੁਣੇ ਰੋਪੋਸੋ ਐਪ ਡਾਊਨਲੋਡ ਕਰੋ ਅਤੇ 100 ਕੋਇਨਜ਼ ਪਾਣ ਲਈ 24 ਘੰਟੇ ਦੇ ਅੰਦਰ ਸਾਇਨ ਅੱਪ ਕਰੋ|ਹੈਲੋ, ਇੰਡੀਆ ਦਾ ਆਪਣਾ ਵੀਡੀਓ ਐਪ - ਰੋਪੋਸੋ ਤੇ Manjeet Warval ਦਾ ਵੀਡੀਓ ਦੇਖੋ | ਨਾਲ ਹੀ PM ਮੋਦੀ ਦੇ 'ਵੋਕਲ ਫ਼ਾਰ ਲੋਕਲ' ਮੋਹਿਮ ਨੂੰ ਸਫ਼ਲ ਬਣਾਉਣ ਲਈ ਰੋਪੋਸੋ ਤੇ 5 ਕਰੋੜ ਤੋਂ ਜ਼ਿਆਦਾ ਭਾਰਤੀਆਂ ਦੇ ਨਾਲ ਜੋੜੋ| ਹੁਣੇ ਰੋਪੋਸੋ ਐਪ ਡਾਊਨਲੋਡ ਕਰੋ ਅਤੇ 100 ਕੋਇਨਜ਼ ਪਾਣ ਲਈ 24 ਘੰਟੇ ਦੇ ਅੰਦਰ ਸਾਇਨ ਅੱਪ ਕਰੋ|ਹੈਲੋ, ਇੰਡੀਆ ਦਾ ਆਪਣਾ ਵੀਡੀਓ ਐਪ - ਰੋਪੋਸੋ ਤੇ Manjeet Warval ਦਾ ਵੀਡੀਓ ਦੇਖੋ | ਨਾਲ ਹੀ PM ਮੋਦੀ ਦੇ 'ਵੋਕਲ ਫ਼ਾਰ ਲੋਕਲ' ਮੋਹਿਮ ਨੂੰ ਸਫ਼ਲ ਬਣਾਉਣ ਲਈ ਰੋਪੋਸੋ ਤੇ 5 ਕਰੋੜ ਤੋਂ ਜ਼ਿਆਦਾ ਭਾਰਤੀਆਂ ਦੇ ਨਾਲ ਜੋੜੋ| ਹੁਣੇ ਰੋਪੋਸੋ ਐਪ ਡਾਊਨਲੋਡ ਕਰੋ ਅਤੇ 100 ਕੋਇਨਜ਼ ਪਾਣ ਲਈ 24 ਘੰਟੇ ਦੇ ਅੰਦਰ ਸਾਇਨ ਅੱਪ ਕਰੋ|ਹੈਲੋ, ਇੰਡੀਆ ਦਾ ਆਪਣਾ ਵੀਡੀਓ ਐਪ - ਰੋਪੋਸੋ ਤੇ Manjeet Warval ਦਾ ਵੀਡੀਓ ਦੇਖੋ | ਨਾਲ ਹੀ PM ਮੋਦੀ ਦੇ 'ਵੋਕਲ ਫ਼ਾਰ ਲੋਕਲ' ਮੋਹਿਮ ਨੂੰ ਸਫ਼ਲ ਬਣਾਉਣ ਲਈ ਰੋਪੋਸੋ ਤੇ 5 ਕਰੋੜ ਤੋਂ ਜ਼ਿਆਦਾ ਭਾਰਤੀਆਂ ਦੇ ਨਾਲ ਜੋੜੋ| ਹੁਣੇ ਰੋਪੋਸੋ ਐਪ ਡਾਊਨਲੋਡ ਕਰੋ ਅਤੇ 100 ਕੋਇਨਜ਼ ਪਾਣ ਲਈ 24 ਘੰਟੇ ਦੇ ਅੰਦਰ ਸਾਇਨ ਅੱਪ ਕਰੋ|

Come help me please
ThankS

Come help me pleaseThankS

Answers

Answer:

Pretty sure it's density since its measuring a crowd - Option B :)

Explanation:

I rode my bicycle to grandmother's house at 6 km/h in a flat road for 5 min before reach a hill. I went at 2 km/h up the hill for 3minutes. I met a friend and stopped to talk for 5 minutes. I went on at 2 km/h to my grandmother's house. Draw (plot) the v against t graph for this motion.​

Answers

The graph can be plotted based on the given information which are given

in pairs (velocity and time), and which the coordinate pairs are formed.

Please find attached the required v against t graph created with MS Excel

Reasons:

The given data are presented in a tabular form as follows;

\(\begin{tabular}{|c|c|c}\underline{Duration (Minutes)} & \underline{Speed (km/h)}\\0 - 5 &6 \\5 - 8&2\\8 -13&0&\\13- &2&\end{array}\)

The velocity time graph can be plotted using the above table values on

MS Excel using the above table elaborated as follows;

\(\begin{tabular}{|c|c|c}\underline{Duration (Minutes)} & \underline{Speed (km/h)}\\0 &6 \\5&6\\5 &2\\8&2\\8&0\\13&0&\\13 &2&\end{array}\)

The attached graph can then be created using the Insert Chart menu

after selecting the data above inputted in the spreadsheet button on MS

Excel.

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I rode my bicycle to grandmother's house at 6 km/h in a flat road for 5 min before reach a hill. I went

describe and explain how energy if thermally transferred from the heating element to the food in a conventional oven

Answers

Answer:

The thermal transfers via "Conduction and Radiation"

Explanation:

Because, Convection is the transfer of thermal energy by particles moving through a fluid. Thermal energy is always transferred from an area with a higher temperature to an area with a lower temperature.

Moving particles transfers the thermal energy through a fluid by forming convection currents.

It transfers ( thermal ) heat energy to a food's surface via convection and radiation. So that, the heat energy on the food's surface, then it spreads via "conduction" towards the food's center.

A glass window (n = 1.52) has a
uniform layer of ice on it (n = 1.31).
What is the critical angle for a ray
trying to pass from glass to ice?
(Water n = 1.33, Air n = 1.00)
(Unit = deg)
HELP PLSS!!

Answers

Answer: 59.5 deg

Explanation: In this problem, we are giving 1.31 as n2 and 1.52 as n1. Using the formula of critical angle= arcsine(n2/n1) we get the equation critical angle=arcsine(1.31/1.52) from there, you divide 1.31 by 1.52, and get 0.862.

On your calculator you then should press 2nd and then the sine button to get sine^-1 (arcsine) and in the parenthesis after arcsine put in 0.862, the answer you get will be 59.5.

What is the length of a lossless transmission line having 50 ohm characteristic impedance?

Answers

The length of a lossless transmission line having a 50-ohm characteristic impedance depends on the frequency of the signal being transmitted.

The length can be calculated using the equation L = λ/4, where L is the length of the transmission line and λ is the wavelength of the signal. The wavelength can be calculated using the equation λ = c/f, where c is the speed of light and f is the frequency of the signal. Therefore, the length of the transmission line can be determined by knowing the frequency of the signal.

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what is the SI unit of wavelength of a wave?

Answers

The SI unit of wavelength of a wave is meters (m).

Ram travel 50metre on a straight road in 30second . hari covers the same distance on the same road in 45s . who has done more work ? who has more ? Explain in short​

Answers

Answer:

The ram has done more work because the rate at which the ram work is 1.6m/s and Hari is 1.1m/s

how many cubic objects of volume 2cm cube can be started in a room of dimension 2m by 3m by 4m​

Answers

Answer:

12,000,000 boxes

Explanation:

the volume of the room can be found by using the equation for volume of a rectangular box:V=LxWxH

where:

L=2m

W=3m

H=4m

(it doesn't really matter which is which since it is multiplication)

when we multiply our values (2m*3m*4m) we get 24cubic meters

now we need to convert cubic meters to cubic centimeters

each cubic meter is 1,000,000 cubic centimeter we multiply 24 by 1,000,000 and we get: 24,000,000 cubic centimeters (cc)

dividing 24,000,000 by 2 (since each box is 2cc) we get 12,000,000

so, we know we can fit 12,000,000, 2 cubic centimeter boxes in this room

The bus covered a distance of 120 km in 2 hours and covered 80 km in the first half of the time and 40 km in the second half. What is the average speed of the bus?​

Answers

The average speed of the bus is 60 km/hr.

What is the average speed of the bus?​

To find the average speed of the bus, we can use the formula:

Average speed = total distance traveled / total time taken

The total distance traveled by the bus is 80 km + 40 km = 120 km, which is given in the problem statement.

The total time taken by the bus is also given as 2 hours.

Therefore, the average speed of the bus can be calculated as:

Average speed = total distance traveled / total time taken

= 120 km / 2 hours

= 60 km/hr

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Complete the statement below about developing technology responsibly.
To develop technology responsibly, people must evaluate both the ____________ and the____________ consequences of the technology​

Answers

Answer:

Positive & negative

Explanation:

To develop technology responsibly, people must evaluate both the immediate and the long-term consequences of the technology.

This entails considering not only the short-term benefits and potential gains but also the potential risks, ethical implications, and broader societal impacts that the technology may introduce. Responsible development requires a comprehensive analysis of how the technology could affect individuals, communities, economies, and the environment. Striking a balance between innovation and accountability is essential to ensure that the benefits of technology are maximized while minimizing any unintended harm. By thoroughly examining both the immediate and long-term consequences, developers can make informed decisions that prioritize the well-being of all stakeholders and foster a more sustainable technological landscape.

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6. The electric force between two charged objects is influenced by

Answers

Answer:

the amount of each charge and the distance between them. ... Coulomb's law states the the electric force between two charges is proportional to the product of the two charges and inversally proportional to the square distance that separates their centers.

in one method of measuring backlash, a bar is attached to the driven shaft and a dial indicator measures its movement. this method must be adjusted to account for the ___ of the bar.

Answers

In one method of measuring backlash, a bar is attached to the driven shaft and a dial indicator measures its movement. this method must be adjusted to account for the flexion or bending of the bar.

It is because When using the bar method to measure backlash, a bar is attached to the driven shaft and a dial indicator measures its movement.

However, the bar may flex or bend due to its own weight or external forces, leading to inaccurate measurements of the backlash.

Therefore, to obtain accurate results, the method must be adjusted to account for the flexure or bending of the bar. This can be done by placing the bar in a support at some distance from the indicator or by using a more rigid and less flexible bar.

It is important to account for the flexure of the bar to ensure accurate measurements and proper functioning of the system.

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A simple magnifier has a magnifying power of 5x. Calculate the following: The focal length of the lens (units needed): The angular magnification M_a of the lens for a person whose near point is 30 cm: The dioptric power of the lens:

Answers

The dioptric power of the lens is 5 diopters.

To calculate the focal length of the lens, we can use the formula:

Focal length (f) = 1 / magnifying power (M)

Given that the magnifying power of the lens is 5x, we can substitute this value into the formula:

f = 1 / 5 = 0.2 units (assuming units are meters)

Therefore, the focal length of the lens is 0.2 units (meters).

To calculate the angular magnification (Mₐ) for a person whose near point is 30 cm, we can use the formula:

Mₐ = 1 + (D / F)

Where D is the least distance of distinct vision (typically taken as 25 cm) and F is the focal length of the lens.

Given that the near point is 30 cm, we substitute the values into the formula:

Mₐ = 1 + (0.3 / 0.2) = 1 + 1.5 = 2.5

Therefore, the angular magnification of the lens for a person with a near point of 30 cm is 2.5.

The dioptric power of the lens is given by the formula:

Power (P) = 1 / focal length (f)

Using the previously calculated focal length of 0.2 units, we can calculate the dioptric power:

P = 1 / 0.2 = 5 diopters

Therefore, the dioptric power of the lens is 5 diopters.

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If a 0.3% decrease in the price of a good causes its quantity supplied to decrease by 1%, then the supply is: A. Unit elastic B. Elastic C. Inelastic D. Perfectly inelastic

Answers

If a 0.3% decrease in the price of a good causes its quantity supplied to decrease by 1%, then the supply is C. Inelastic.

In this scenario, the supply of the good is considered inelastic. The elasticity of supply measures the responsiveness of the quantity supplied to changes in price. When the price of a good decreases, and the quantity supplied decreases by a larger percentage, it indicates that the supply is relatively unresponsive to price changes.

To determine the elasticity of supply, we compare the percentage change in quantity supplied to the percentage change in price. In this case, a 0.3% decrease in price results in a 1% decrease in the quantity supplied. Since the percentage change in quantity supplied (1%) is greater than the percentage change in price (0.3%), the supply is considered inelastic.

Inelastic supply means that producers are less responsive to price changes, and a small change in price leads to a proportionally smaller change in quantity supplied. In such cases, producers may find it challenging to adjust their output levels quickly in response to price fluctuations.

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Energy is transferred in an electrical circuit through.

Answers

Answer:

Poynting field

Explanation:

magnetic field of currents named the Poynting field, chosen following in position or time the 19th of one hundred years English researcher John Poynting.

A 35.0-g bullet strikes a 4.6-kg stationary piece of lumber and embeds itself in the wood. The piece of lumber and bullet fly off together at 7.2 m/s. What was the original speed of the bullet

Answers

After converting grams to kilograms (35.0 g = 0.035 kg) and performing the calculation, we find that the original speed of the bullet (V) is approximately 7.4086 m/s.

To determine the original speed of the bullet, we can use the principle of conservation of momentum. The momentum before the collision is equal to the momentum after the collision.

The momentum before the collision is given by the formula: momentum = mass × velocity.

Let's assume the original speed of the bullet is V.

Before the collision:

Momentum of the bullet = mass of the bullet × velocity of the bullet = (35.0 g) × V

Momentum of the lumber = mass of the lumber × velocity of the lumber = (4.6 kg) × 0 (since the lumber is stationary)

After the collision:

The combined mass of the bullet and lumber is (35.0 g + 4.6 kg) = 4.635 kg.

The velocity after the collision is 7.2 m/s.

Using the conservation of momentum equation:

Momentum before the collision = Momentum after the collision

(35.0 g) × V = (4.635 kg) × 7.2 m/s

Now we can solve for V:

V = ((4.635 kg) × 7.2 m/s) / (35.0 g)

After converting grams to kilograms (35.0 g = 0.035 kg) and performing the calculation, we find that the original speed of the bullet (V) is approximately 7.4086 m/s.

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Table 4. Interaction between two permanent bar magnets what i did to the pair of magnets to cause interaction. Observed effect/s (attracted or repeled).

Answers

In order to attract or repel another substance, a substance must be a magnet. The atoms are arranged in domains of a magnet, each of which is aligned in a . Both the North and South poles of a magnet are present.

What comprises a magnet?

Iron, nickel, or cobalt make up the majority of permanent magnets. An alloy called Alnico is comprised of cobalt, nickel, and aluminum. Alnico alloys are capable of producing powerful permanent magnets. They are widely used in industrial applications and consumer electronics.

What are magnet's four applications?

Magnets are used in the operation of microwave ovens, televisions, and computers. Refrigerator doors are held closed by magnets, and road sweeping trucks are also equipped with magnets. In addition, magnets are employed in roller coaster braking systems, railroads, and medical instruments that produce magnetic images.

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Now we have a camera lens with n = 1.50. We want to coat its surface with a thin film of magnesium fluoride (MgF2, n = 1.38), so that it hardly reflects any yellow-green light, which the human visual system is most sensitive to. Our goal is to find the smallest non-zero thickness (tmin) of the film that will produce completely destructive interference for the yellow-green light (λ= 550 nm in vacuum). Assume the light is traveling in air before encountering the film, and that the light strikes the film at normal incidence.What is the minimum non-zero thickness of the coating that will produce destructive interference for the yellow-green light?_______ nm

Answers

The minimum non-zero thickness of the coating that will produce destructive interference for yellow-green light is 91.7 nm.

To find the minimum non-zero thickness of the magnesium fluoride coating that will produce destructive interference for yellow-green light, we need to use the equation for the thickness of a thin film required for destructive interference:

t = (m + 1/2) * λ / (2 * n * cosθ)

Where:
m = 0 (since we want destructive interference)
λ = 550 nm (the wavelength of yellow-green light)
n = 1.50 (the refractive index of the lens)
θ = 0° (since the light strikes the film at normal incidence)

Substituting these values, we get:

t = (0 + 1/2) * 550 nm / (2 * 1.50 * cos0°)
t = 91.7 nm

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Find the instantaneous rate of change of the position function y=f(t) in feet at the given time t in seconds. f(t)=3t−7,t=1
Find the instantaneous rate of change of the position function y=f(t) in feet at the given time t in seconds.
f(t)=3t−7,t=1

Answers

The instantaneous rate of change of the position function y=f(t) in feet at the given time t in seconds. f(t)=3t−7,t=1 is as follow:

The function is f(t) = 3t - 7 and t = 1.

Using the concept of derivatives, the instantaneous rate of change of the position function y = f(t) in feet at the given time t in seconds is given by;

f'(t) = lim (h → 0) [f(t + h) - f(t)]/h

Now, we have f(t) = 3t - 7 and t = 1.

Substitute t = 1 in the above formula to get the instantaneous rate of change of the position function.

f'(1) = lim (h → 0) [f(1 + h) - f(1)]/h

Using the given function f(t) = 3t - 7,f'(1)

= lim (h → 0) [f(1 + h) - f(1)]/h

= lim (h → 0) [3(1 + h) - 7 - (3(1) - 7)]/h

= lim (h → 0) [3h]/h= 3

Therefore, the instantaneous rate of change of the position function y = f(t) in feet at the given time t = 1 second is 3 feet per second.

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positive charge of q coulombs is uniformly spread over a large flat surface of area 6.77 meters squared. what would q need to be to make the magnitude of the electric field 0.00264 meters away from the surface equal to 1.43 n/c?

Answers

The Q need to be to make the magnitude of the electric field 0.00264 meters away from the surface equal to 1.43 nC is 1.07 × 10⁻⁹ C.

The  magnitude of the electric field at the point near the charged surface is as :

E = Q / (4 × π × ε × A)

Q = E ( 4 × π × ε × A)

Where

E = 1.43 nC

ε = 8.85 x 10⁻¹² C²/N m²

A = 6.77 m²

Q = E ( 4 × π × ε × A)

Q  = 1.43 × 4 × 3.14 × 8.85 x 10⁻¹² × 6.77

Q = 1.07 × 10⁻⁹ C

Thus, the charge is  1.07 × 10⁻⁹ C.

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q2. is it possible for the particle undergoing tunneling to be found within the barrier, rather than on either side of it?

Answers

Yes, it is possible for a particle to be found within the barrier while undergoing tunneling.

This phenomenon is known as quantum tunneling. Quantum tunneling occurs when a particle tunnels through a barrier that is normally too high to be crossed by the particle's kinetic energy. This occurs due to the wave-like nature of particles, which allows them to go through barriers that are otherwise impenetrable.

The wave-like nature of particles allows them to penetrate the barrier, often with a probability greater than zero. This phenomenon is used in many applications in science and technology, such as in quantum computing, where quantum tunneling is used to tunnel qubits through the barrier of a logic gate.

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Why learning SI base unit are important to understanding the sizes of a different object?

Answers

A base unit (also referred to as a fundamental unit) is a unit adopted for measurement of a base quantity. A base quantity is one of a conventionally chosen subset of physical quantities, where no quantity in the subset can be expressed in terms of the others. The International System of Units (SI), commonly known as the metric system, is the international standard for measurement. ... The SI is made up of 7 base units that define the 22 derived units with special names and symbols. The units and their physical quantities are the second for time, the metre for measurement of length, the kilogram for mass, the ampere for electric current, the kelvin for temperature, the mole for amount of substance, and the candela for luminous intensity. The various features and future prospects of the International System of Units (SI) are described. The SI is based on seven selected base units, corresponding to the seven quantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity. Units are of two types: Fundamental units. Derived units. or powering the base units in various combinations, For example:
mechanical work is force applied multiplied by distance moved and has the unit newton metre written as Nm.
speed is distance divided by time and has the unit metre per second written as ms. The three measures are descriptive, diagnostic, and predictive. Descriptive is the most basic form of measurement.

Which choice can be classified as a pure substance?
A. homogeneous mixture
B. compound
C. heterogeneous mixture
D. solution

Answers

Definitely a compound mixture

What is the mechanical advantage ????

What is the mechanical advantage ????

Answers

Answer:

the advantage gained by the use of a mechanism in transmitting force specifically : the ratio of the force that performs the useful work of a machine to the force that is applied to the machine.

Explanation:

Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system. The device trades off input forces against movement to obtain a desired amplification in the output force. The model for this is the law of the lever.

An ice skater accelerates backward for 5.0 second to final speed of 12m/s. If the acceleration backward was at a a rate of 1.5m/s2 what was the skater's initial speed

Answers

Answer:

Initial velocity, U = 4.5m/s

Explanation:

Given the following data;

Final velocity, v = 12m/s

Time, t = 5 seconds

Acceleration, a = 1.5m/s²

To find the initial velocity, we would use the first equation of motion.

\( V = U + at\)

Where;

V is the final velocity.

U is the initial velocity.

a is the acceleration.

t is the time measured in seconds.

Substituting into the equation, we have;

12 = U + 1.5*5

12 = U + 7.5

U = 12 - 7.5

Initial velocity, U = 4.5m/s

describe how a diffraction grating affects the light from a hydrogen lamp.

Answers

The diffraction grating affects the light from a hydrogen lamp as it produces the separation of the colors of the white light. The spectrum can be viewed through the grating,

If a stone has 390 J of energy and is moving with a speed of 12m/s, what is the mass of the stone?

Answers

Answer: 5.42 kg

Explanation:

The formula for kinetic energy is:

KE = 1/2 * m * v^2

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

We are given the kinetic energy (KE) and velocity (v), so we can rearrange the formula to solve for the mass (m):

m = 2 * KE / v^2

Substituting the given values, we get:

m = 2 * 390 J / (12 m/s)^2

m = 2 * 390 J / 144 m^2/s^2

m = 5.42 kg (rounded to two decimal places)

Therefore, the mass of the stone is approximately 5.42 kg.

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