Part A Consider a circuit containing five identical light bulbs and an ideal battery. Assume that the resistance of each light bulb remains constant. Rank the bulbs (A through E) based on their brightness. Rank from brightest to dimmest. To rank items as equivalent, overlap them.

To help psychologists separate uninformed opinions from examined conclusions, psychologists use the scientific method to conduct research. Thus, the correct option for this question is D.

The scientific method may be defined as the process of objectively establishing facts through testing and experimentation.

The basic process involves making an observation, forming a hypothesis, making a prediction, conducting an experiment, and finally analyzing the results.

Psychologists generally employ the scientific method before stating the question, offering a theory, and then constructing rigorous laboratory or field experiments to test the hypothesis.

Therefore, to help psychologists separate uninformed opinions from examined conclusions, psychologists use the scientific method to conduct research. Thus, the correct option for this question is D.

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At a height of 4.950 metres above the earth, the earth's gravitational pull on a 70 kg physics student in an aeroplane is approximately 688.7 N strong.

The following are some instances of the power of gravity: the energy holding the gases inside the sun. the power behind a ball's descent after being thrown into the air. the force that makes an automobile coast downhill even when the gas is not depressed.

The following equation describes the gravitational attraction between the earth and a mass m object at a distance r from the earth's centre:

F = G * (M * m) / r^2

where G is the gravitational constant, M is the mass of the earth, and r is the distance between the center of the earth and the object.

Substituting the given values, we get:

F = G * (M * m) / r^2

= 6.67 × 10^-11 N·m^2/kg^2 * (5.98 × 10^24 kg * 70 kg) / (4950 m + 6.37 × 10^6 m)^2

≈ 688.7 N

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According to the question, for a car with a force of 18 N and displacement of 8 m, the work done by a car is calculated as 144Nm.

Force may be defined as a process of pushing or pulling on an object that significantly produces acceleration in the body on which it acts. It is an external agent capable of changing a body's state of rest or motion. It has a magnitude and a direction.

According to the question,

The force applied on a car = 18 N

The displacement made by a car = 8m.

Now, the work done is calculated with the help of the given formula:

                          = 18 N × 8m = 144Nm.

Therefore, the work done by a car is calculated as 144Nm.

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The velocity immediately following is zero since there was no rebound. 665 kg/s.

In free fall, an object drops steadily. The speed of something falling freely is constant. There is no resistance to the object's descent caused by gravity when it is in free fall. An object falling freely encounters air resistance in the absence of any additional resistance.

According to the given information:

The impulse is given by:

J = change in momentum

J=m(va−vb )

where

va=velocity after

vb=velocity before

The velocity just before is given by

vb=2∗9.81m/s 2∗9m(under root)

=13.3m/s(− j )

Because there were no rebound, the velocity immediately following is zero.

As a result, the impulse is equal to 50(0+13.3m/s(j) = 665kg..

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Part A, the minimum stopping distance for the car traveling at 46 m/s is 116 m. For the minimum stopping distance to find the minimum stopping distance for the car traveling at 46 m/s:

dstop = vo Treact + (vo^2)/(2abrake)

The minimum stopping distance of a car traveling at speed vo with a reaction time Treact and constant maximum braking acceleration abrake can be found by considering the distance traveled during the driver's reaction time and the distance traveled while the car is slowing down due to braking. The total stopping distance is given by:

dstop = dreact + dbrake

where dreact is the distance traveled during the driver's reaction time and dbrake is the distance traveled while the car is slowing down due to braking.

The distance traveled during the driver's reaction time is given by:

dreact = vo Treact

The distance traveled while the car is slowing down due to braking can be found using the kinematic equation:

v^2 = vo^2 + 2a(x - xo)

where v is the final velocity, xo is the initial position, x is the final position, and a is the acceleration. In this case, we want to find the distance traveled while the car is coming to a stop, so v = 0, xo = 0, and x = dbrake. Solving for dbrake, we get:

dbrake = (vo^2)/(2abrake)

Substituting this expression into the total stopping distance equation, we get:

dstop = vo Treact + (vo^2)/(2abrake)

This is the expression for the minimum stopping distance of a car traveling at speed vo with a reaction time Treact and constant maximum braking acceleration abrake.

Part B:

We can use the expression for the minimum stopping distance derived in Part A to find the minimum stopping distance of the car traveling at 46 m/s. We are given that the car traveling at 30 m/s can stop in a distance of 70 m, including the distance traveled during the driver's reaction time of 0.50 s. Using this information, we can find the value of abrake as follows:

dstop = vo Treact + (vo^2)/(2abrake)

70 m = (30 m/s)(0.50 s) + (30 m/s)^2/(2abrake)

Solving for abrake, we get:

abrake = (30 m/s)^2/(2(70 m - 15 m)) = 4.08 m/s^2

Note that we subtracted the distance traveled during the driver's reaction time of 0.50 s, which is 15 m, from the total stopping distance of 70 m to get the distance traveled while braking.

Now that we know the value of abrake, we can use the same expression for the minimum stopping distance to find the minimum stopping distance for the car traveling at 46 m/s:

dstop = vo Treact + (vo^2)/(2abrake)

dstop = (46 m/s)(0.50 s) + (46 m/s)^2/(2(4.08 m/s^2)) = 116 m

Therefore, the minimum stopping distance for the car traveling at 46 m/s is 116 m

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a. The potential energy of a hydrogen atom is -2.18 x 10^-18 J. b. The potential energy of a muonic atom is -4.11 x 10^-11 J.

a. The potential energy of a hydrogen atom,

U = -k(q1*q2)/r

where k is the Coulomb constant, q1 and q2 are the charges of the particles, and r is the distance between them.

For a hydrogen atom, the proton has a charge of +e and the electron has a charge of -e, where e is the elementary charge.

U = -k(e^2)/(52.9 pm)

U = -2.18 x 10^-18 J

b. For a muonic atom, the charge of the electron is replaced by a muon with a charge of -e.

U = -k(e^2_muon)/(0.25 pm)

where e_muon = -e = -1.60 x 10^-19 C.

U = -4.11 x 10^-11 J

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To calculate the velocity of a spherical raindrop falling from 4.4 km without air drag, we can use the equations of motion:

v² = u² + 2as

v² = 0 + 2(-9.81 m/s²)(4.4 km) = -2(9.81 m/s²)(4400 m) = -86,140 m²/s²

v = sqrt(86,140 m²/s²) = 293.9 m/s

Therefore, the velocity of the raindrop falling from 4.4 km without air drag is approximately 293.9 m/s.

b. To calculate the velocity of the raindrop falling with air drag, we can use the following equation:

F_drag = 1/2 * rho * v^2 * A * C_d

F_drag = m * g

m * g = 1/2 * rho * v^2 * A * C_d

Solving for v, we get:

v = sqrt((2 * m * g) / (rho * A * C_d))

Substituting the values, we get:

v = sqrt((2 * (4/3) * pi * (3.8/2)^3 * 1000 kg/m³ * 9.81 m/s²) / (1.16 kg/m³ * pi * (3.8/2)^2 * 1.0))

Simplifying, we get:

v = 9.7 m/s

Therefore, the velocity of the raindrop falling from 4.4 km with air drag is approximately 9.7 m/s.

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This is a quote from the novel Song of Solomon which has been authored by Tomi Morrison.

The narrative comes to an ambiguous end with the vision of flying. Readers are left in the dark regarding the fate of Milkman and Guitar even though they both appear to fly in the conclusion. However, Milkman's ability to fly indicates that he has beyond the limitations of his physical form and has a connection to his great-grandfather, Jake, whom he has spent his entire life trying to understand. Despite the fact that Pilate is dead, the book finishes mystically and with a hopeful attitude.

Song of Solomon is a 1977 novel by American author Toni Morrison, her third to be published. It follows the life of Macon "Milkman" Dead III, an African-American man living in Michigan, from birth to adulthood.

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The magnitude and direction of the car's average acceleration is 0.3 m/s² to south. The result is obtained by using the formula for acceleration.

An acceleration is a rate of change in velocity of an object with respect to time. It can be expressed as

a = Δv/Δt

Where

A car is traveling north with a velocity of 17.7 m/s. After 12 s, its velocity becomes 14.1 m/s in the same direction.

Find the magnitude and direction of the car's average acceleration!

We have

The acceleration can be calculated by the formula above.

a = Δv/Δt

a = (v₂ - v₁)/Δt

a = (14.1 - 17.7)/12

a = (-3.6)/12

a = - 0.3 m/s²

The magnitude of the acceleration is 0.3 m/s². While, the direction is the opposite of the car's motion. It's to south.

Hence, the car travels with an acceleration of 0.3 m/s² to south.

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In the given HMM Model, the value of the  P ( O1 = X, O2 = X, O3 = Z | S1 S2 S3 ) = 2/3.

HMM :

HMM or Hidden Markov Model is used for state estimation, determining the most probable path and finding the most likelihood HMM that could have produced a string of observations given by O1, O2...OT.

In the light of the below conversations, the result to the given set of questions are as follows

Clearly,

O1 = X => S1 ;

O2 = X => S1 ;

O3 = Z => S3 .

Hence, the transition is from state S1 to state S3.

Now, as per given diagram :

S1 -> S3 = 2/3 as denoted by the green edge from S1 to S3.

Therefore, P ( O1 = X, O2 = X, O3 = Z | S1 S2 S3 ) = 2/3.

This concludes the answer to all corridor of the question along with the necessary explanations.

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The F4 key is supposed to produce a frequency of 349.2 Hz. Since the estimated frequency of the out-of-tune F4 key is lower than the expected frequency, this indicates that the key is flat.

What is Frequency?

Frequency refers to the number of cycles or repetitions of a periodic wave that occur in a given unit of time. It is usually measured in Hertz (Hz), which represents the number of cycles per second.

For example, in sound waves, frequency refers to the number of pressure fluctuations per second that are perceived by the human ear as a particular pitch or tone. A high-pitched sound, such as a whistle, has a high frequency, while a low-pitched sound, such as a bass guitar, has a low frequency.

Therefore, the frequency being played by the out-of-tune F4 key is approximately 329.6 Hz.

To solve for the frequency of the out-of-tune F4 key, we can use the beat frequency formula:

beat frequency = |frequency of tuning fork - frequency of out-of-tune note|

For the first trial with the E4 tuning fork, we can write:

13.5 Hz = |329.6 Hz - frequency of out-of-tune note|

Solving for the frequency of the out-of-tune note, we find:

frequency of out-of-tune note = 329.6 Hz - 13.5 Hz = 316.1 Hz

For the second trial with the G4 tuning fork, we can write:

48.9 Hz = |392.0 Hz - frequency of out-of-tune note|

Solving for the frequency of the out-of-tune note, we find:

frequency of out-of-tune note = 392.0 Hz - 48.9 Hz = 343.1 Hz

Since we have two estimates of the frequency of the out-of-tune note, we can take their average to get a more precise estimate:

(frequency of out-of-tune note) avg = (316.1 Hz + 343.1 Hz) / 2 = 329.6 Hz

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When a charge Q is given to a thin metallic plate then the charge gets equally distributed between the two plates. Thus we have an electric field produced by one side of the plate is

E=σ2ϵo

where σ=QA and A is the area.

A)

Electric field, E = Q/(A e0)

E = (5.952 x 10^-6)/(pi x 0.0522^2 x 8.85 x 10^-12)

E = 7.86 x 10^7 N/C

B)

Stays the same

An electric field (sometimes E-field) is the physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them. It also refers to the physical field for a system of charged particles.

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The equilibrium force vector would need to be equal in magnitude and opposite in direction to the resultant force vector.

The equilibrium force vector is a third force vector that is added to a system in order to place it in a state of equilibrium. Equilibrium means that the net force acting on the system is zero, so the system remains at rest or moves with a constant velocity.

In general, the concept of an equilibrium force vector can be applied to any system that is subject to multiple forces or other influences, and the equilibrium force vector is the force that is needed to balance out those forces or influences and maintain a state of equilibrium. However, the concept of equilibrium and the equilibrium force vector remain useful for understanding and analysing the forces and dynamics of a system.

In the context of a stationary object subject to two force vectors, the equilibrium force vector is the force that is needed to balance out the other two forces so that the net force on the object is zero, and the object remains stationary in equilibrium. The magnitude and direction of the equilibrium force vector must be carefully calculated to ensure that it cancels out the net force on the object.

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It will take about 233.34 seconds for the hot dog cooker to raise the temperature of the hot dog from 20∘C to 85∘C.

Specific heat is the amount of heat energy required to raise the temperature of a substance by one degree Celsius or one Kelvin per unit mass.

Here,
To solve this problem, we can use the formula for the amount of heat required to change the temperature of an object,

Q = mcΔT

First, we need to calculate the amount of heat required to raise the temperature of the hot dog from 20∘C to 85∘C:

Q = (0.07 kg)(2500 J/kg⋅K)(85∘C - 20∘C)

Q = 1058.5 J

Next, we can use the formula for electrical power,

P = IV

We can rearrange this formula to solve for the current:

I = P/V

The power required to heat the hot dog can be calculated using the formula for electrical power:

P = V²/R

Substituting the given values, we get:

P = (120 V)²/160 Ω

P = 90 W

I = 90 W/120 V

I = 0.75 A

Finally, we can use the formula for the amount of time required to transfer a certain amount of heat:

t = Q/(IΔT)

Substituting the values we calculated, we get:

t = 1058.5 J/(0.75 A)(65∘C)

t = 233.34 s

Therefore, it will take about 233.34 seconds for the hot dog cooker to raise the temperature of the hot dog from 20∘C to 85∘C.

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Answer:

KE = 78 J

Explanation:

Answer:

Explanation:a

The semilunar valves will open when the pressure within the ventricles exceeds the pressure within the great arteries.

The heart valve located at the base of the aorta and the pulmonary artery is known as a semilunar valve. It is made up of cusps or flaps that prevent the blood from flowing backwards during the systole phase of the heart's beat. The semilunar valves are responsible for controlling the flow of blood between the ventricles and the main arteries, which directs blood flow away from the heart and towards the organs that are necessary for survival.

Mitral and tricuspid valves prevent blood from flowing backwards into the atria. This is necessary because blood travels from the atria to the ventricles. Pressure differences between the chambers are the driving force behind the opening and closing of semilunar valves, which are controlled by how they are operated.

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Answer:

Explanation:

Kinetic energy = 1/2*m*v^2

The kinetic energy is 4400 joules. The mass is 29 kg. What is the speed

4400 = 1/2*29*v^2

v^2 = 303.44

v=17.42m/s^2

The mass is 18 kg. The velocity is 4.7 m/s. What is the kinetic energy?

KE= 1/2*18*4.7*4.7=198.81J

A solar system's planets, sun, and other things are created in the solar nebula, a huge disc-shaped mass of gas and dust. Nebula is a Latin term that means "cloud." The

Describe solar energy.

Visit the Article History. Solar energy is another name for it. Solar energy is the name given to the Sun's radiation that can ignite chemical reactions, produce heat, or create electricity. The total solar energy incidence on Earth is far greater than the global energy needs at the moment and in the future. This is extremely dispersed if properly harnessed.

What advantages does solar energy offer?

When combined with storage, solar energy may supply backup power for nights and outages, lower electricity costs, help build a more robust electrical grid, promote economic growth, create jobs, and operate at equivalent effectiveness on both small and big sizes. There are numerous types and sizes of solar energy systems.

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The ball must be thrown with a initial speed of 31.30 m/s from the ground level to rise it to a maximum height of 50m and it will in the air for 6.38 seconds.

Given, we have the distance ball needs to travel = 50m and we know that the final velocity at the maximum height when thrown vertically will be 0. And the acceleration will be 9.8m/s²  which is acceleration due to Earth's gravity. Now, using the equations of motion we can find the initial velocity needed :

⇒ v² -  u²  = 2as where v stands for final velocity, u stands for initial velocity , s stands for the distance travelled and a stands for the acceleration. Therefore,

⇒ -u² = 2 x (-9.8m/s²) x 50m

⇒  u²= 980         (taking square roots on both sides of the equation)

⇒ u  = 31.30 m/s  

Now, we can easily find the duration for which the ball stays in the air using the equation v = u + at.

⇒ 0  = 31.30 + (-9.8)t     (solve the equation for t)

⇒ 31.30 = 9.8t

⇒31.30 / 9.8 = t

⇒t = 3.19 seconds

Now, this is the time required by the ball to reach the maximum height, the total time for which the ball stays in air will be twice of this because we also have to take account of the time required by the ball to reach to the ground from the maximum height which is equal to the time we calculated since this is a free fall situation.

Therefore, total time for which the ball stays in the air after throwing it with a speed of 31.30 m/s : 2 x 3.19 seconds. The graphs are attached below.

⇒  6.38 seconds

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We can use the given equation for the temperature change in the house to determine the values of C and R:

Th - To C (dTh)/dt = Ku - (Th - To)/R

utilising the knowledge that the furnace raises the temperature by 2°F every 0.1 h, we can calculate the value of K/R:

K/R is equal to (Th-to)/(Ku-(Th-to)/R)

(Th - 60°F)/(90,000 BTU/h - (Th - 60°F)/R) = 2°F/0.1h

When we simplify and find R, we obtain:

R is calculated as (Th - 60°F)/(45,000 BTU/h - 0.5*(Th - 60°F)).

Next, we may calculate the value of C using the knowledge that, with the furnace off, the house temperature drops 2°F in 40 minutes (0.67 h):

C (dTh)/dt = -2°F/0.67h

Using a C-solve, we obtain:

-2°F/(0.67h dTh/dt) = C

We can solve for Th by substituting the value of R that we discovered before into the equation for K/R:

(Th - 60°F)/(90,000 BTU/h - (Th - 60°F)/R) = 2°F/0.1h

ThR - 60,000 + 90,000 Th - Th2 = 2,000 BTU

Th = 57.7°F or 62.3°F

We can use the temperature change information to determine which value of Th is the correct one. Since the furnace raises the temperature in the house, the correct value of Th is 62.3°F.

Substituting the values of Th, To, K, and R into the equation for C, we get:

C = -2°F/(0.67h × (dTh/dt))

C = -2°F/(0.67h × (62.3°F - 60°F)/(0.1h))

C = 167,910 BTU/°F

Substituting the values of Th, To, K, and R into the equation for R, we get:

R = (Th - 60°F)/(45,000 BTU/h - 0.5*(Th - 60°F))

R = (62.3°F - 60°F)/(45,000 BTU/h - 0.5*(62.3°F - 60°F))

R = 0.00038°F·h/BTU

Therefore, the values of C and R for the house are C = 167,910 BTU/°F and R = 0.00038°F·h/BTU.

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Explanation:

the displacement is the length of direct line of sight from the starting point to the end point. in other word the baseline of the created triangle.

the legs of that triangle are 10 cm and 6 cm.

the angle between both legs is 90 + 45 = 135°.

because 90° is the angle between South and West. and for southwest we have to add 45°

the law of cosine :

c² = a² + b² - 2ab×cos(C)

c is a side, C is the opposite angle, a and b are the other 2 sides.

so, we have in our case

displacement² = 10² + 6² - 2×10×6×cos(135) =

= 100 + 36 - 120×cos(135) =

= 136 - 120×-0.707106781... =

= 136 - 120×-sqrt(2)/2 =

= 136 + 60×sqrt(2) =

= 220.8528137...

displacement = 14.86111751... cm ≈ 15 cm

An ideal gas undergoes an isothermal process. The correct answer to this question is a statement (ii) The internal energy of the gas does not change and statement (iii) .

The average kinetic energy of the molecules does not change. An isothermal process is a thermodynamic process in which the temperature of a system remains constant. This means that the internal energy of the system, which is related to the average kinetic energy of the molecules, also remains constant. Therefore, statements (ii) and (iii) are true. However, statement (i) is not true. In an isothermal process, heat can be added to or removed from the gas in order to keep the temperature constant. For example, if the gas is expanding, heat will need to be added to the system in order to maintain a constant temperature. Conversely, if the gas is being compressed, heat will need to be removed from the system in order to maintain a constant temperature.

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For solution of a) of the particular question where a thin rod and uniform change lies along the x axis=

λ = linear charge density

Consider a small length "dx" at distance "x" from the origin

dq = small charge on the small length = λ dx

r = distance of small length from point P = sqrt(x2 + d2)

small electric field at P due to small length is given as

dE = k dq/r2

dE = k λ dx /(sqrt(x2 + d2))2

dE = k λ dx /(x2 + d2)

From the diagram , we see that "dE Sinθ" are equal and opposite, hence x-components cancel out.

Net electric field at P is given as

E = ∫ 2 dE Cosθ

E = ∫ 2 (k λ dx /(x2 + d2)) (d/sqrt(x2 + d2))

E = ∫ 2 (k λ d dx /(x2 + d2)3/2)

E = ∫ _{0}^{l/2} 2 (k λ d dx /(x2 + d2)3/2)

E = (2 k λ d) ∫_{0}^{l/2}dx /(x2 + d2)3/2

E = (2 k λ d) ((l/2)/ (d2 sqrt(d2 + (l/2)2))

E = (2 k λ d) (Sinθ _{o}/ d2 )                                    

Since

Sinθ _{o} = (l/2) /sqrt(d2 + (l/2)2)

E = 2 k λ Sinθ _{o}/ d

For solution of b)

for infinite length , θ _{o}= 90

E = 2 k λ Sin90/ d

E = 2 k λ / d

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Answer:

physiology

Explanation:

they examine the tissue and cell

When the liquid cools down, it loses heat energy.

As the liquid cools, it loses heat energy. As a result, its particles slow down in movement and come closer to one another. Attractive forces begin to hold particles and the crystals of a solid form.

If water is cooled, it can change into ice. If ice is warmed, it can change into a liquid state. Heating a substance makes the molecules move very fast whereas cooling a substance makes the molecules move very slowly.

Heating a liquid increases the speed of the molecules present in it. An increase in the molecule's speed competes with the attraction between molecules and results in the molecules moving apart whereas Cooling a liquid decreases the movement of the molecules.

So we can conclude that the liquid cools down when it loses heat energy.

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B will make it to the finish line first assuming they are all charged objects released from rest at the same time.

This is because the acceleration of the charged object is proportional to the magnitude of the electric field and inversely proportional to the mass of the object. Since all the charged objects have the same mass, the acceleration will depend only on the magnitude of the electric field.

In this case, the electric field is uniform and in the direction of the finish line, which means that the magnitude of the electric field is the same for all the charged objects. Therefore, the acceleration will be the same for all the charged objects.

However, since the magnitude of the force on each object is different due to their different charges, the velocity of the objects will differ. The charged object with the smallest charge, which is object B, will have the highest velocity and make it to the finish line first.

Objects A and D will have the same velocity and reach the finish line simultaneously. Object C will be the slowest and reach the finish line last. Therefore, the correct answer is B.

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Range of values for given condition will depend on magnitude and directions of the three given forces. [tex]|R| < = 2400 N[/tex]

To find the range of values for the magnitude of force P so that the resultant of the three forces does not exceed 2400 N, find magnitude and direction.

We can do this by using vector addition. Adding the three forces together, we get:

R = F1 + F2 + F3

where F1, F2, and F3 are the magnitudes and directions of the three given forces, and R: magnitude with resultant force direction.

To ensure that the resultant force does not exceed 2400 N, we must have:

|R| <= 2400 N

Therefore, we need to find the range of values for the magnitude of force P that satisfy this inequality.

The magnitudes and directions of the three given forces are not specified in the problem, so we cannot provide a specific numerical answer. However, we can provide a general method for solving the problem.

To find the range of values for the magnitude of force P, we can first find the maximum and minimum values of the magnitude of the resultant force for different values of P. We can then find the range of values of P that satisfy the inequality above.

This can be done numerically by using vector addition and trigonometry to find the magnitude and direction of the resultant force for different values of P. Alternatively, we can use graphical methods such as force polygons or vector diagrams to visualize the resultant force and find the range of values of P that satisfy the inequality.

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The force required to stretch the spring up to 0.5 m is 20 N. Then, the spring constant of the spring is 40 N/m. Then, a force of 50 N will stretch the same spring up to 1.2 m.

The force required to stretch an elastic material is directly proportional to the displacement x of the material.

hence, F = -kx

Where, the proportionality constant k is called spring constant.

Given that, the force required to stretch the spring up to 0.5 m is 20N.

then, spring constant = force/displacement

k = 20 N/0.5 m

  = 40 N/m.

Then, the displacement made by a force of 50 N applied on the same spring is:

x = F/k

  = 50 N/40 N/m

  = 1.2 m.

Therefore, the force of 50 N will stretch the spring up to 1.2 m.

Find more on spring constant:

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Your question is incomplete. But your complete question probably was:

A 20 N force stretches a spring to 0.5 m. How far will a 50 N force stretch the same spring?

Answer:

Below

Explanation:

Find time of first stone to strike water ....second stone take 1 s less

First stone

d = 1/2 a t^2

43.9 = 1/2 (9.81)(t^2)   shows  t = ~ 3 seconds

Second stone

d = vo t + 1/2 a t^2

43.9 = vo (t) + 1/2 (9.81) t^2       t = 3 -1 = 2 seconds

43.9 = vo (2) + 4.905 (2)^2

   shows vo = 12.1 m/s