A researcher who does not want to manipulate or interfere with the behavior of research subjects would conduct a __________ study.
A.
cross-sectional
B.
naturalistic observation
C.
case
D.
longitudinal



Please select the best answer from the choices provided


A
B
C
D

There are  44180640 seconds in 1.40 year .

365 or 366 days, divided into 12 months or 52 weeks, make up the time from 1 January to 31 December, or a year.

1 year equals to 365.25 days

1.40 years equal to (1.40 × 365.25 days)

= 511.35 days.

1 day equals to 24 hours.

1 hour equals to 60 minute.

1 day equals to (24 × 60 × 60) second = 86400 seconds.

511.35 days equals to (511.35 ×  86400 seconds) = 44180640 seconds

So, 1.40 years equal to 44180640 seconds.

Hence, There are  44180640 seconds in 1.40yr .

Learn more about year here:

https://brainly.com/question/24319982

#SPJ1

The elastic potential energy stored in the spring is 0.375 J.

The formula for elastic potential energy is:

E = 1/2 * k * x^2

where:

* E is the elastic potential energy in Joules

* k is the spring constant in N/m

* x is the distance the spring is stretched or compressed from its equilibrium position in meters

In this problem, we have:

* k = 3 N/m

* x = 0.5 m (50 cm)

Substituting these values into the formula, we get:

E = 1/2 * 3 * 0.5^2 = 0.375 J

Therefore, the elastic potential energy stored in the spring is 0.375 J.

Conduction is a process through which energy is transferred from the branding iron to the handle.

When two objects with different surface temperatures come into close touch with one another, conduction happens. Up until they reach thermal equilibrium, or the point at which they are at the same temperature, the heat energy moves from the hotter to the cooler object.

The metal tip of the branding iron, which makes contact with the branded surface, becomes extremely hot when it is placed in the fire because of the high fire temperature.

Hence, conduction is a process through which energy is transferred from the branding iron to the handle.

To learn more about conduction, here:
https://brainly.com/question/31201773

#SPJ3

The energy level from which is emitted is n = 6

The frequency is\(7.3 * 10^14\) Hz

The Rydberg equation is a mathematical formula that relates the wavelengths of light emitted by an atom to the energy levels of its electrons.

Using the Rydberg equation;

1/λ= RH (1/\(n_{2}^2\) - 1/\(n_{1} ^2\))

1/\(410.2 * 10^-9\) = \(1.097 * 10^7\)(1/\(2^2\) - 1/  /\(n_{1} ^2\))

1/\(4.102 * 10^-7\) = \(1.097 * 10^7\)(1/4 - 1/\(n_{1} ^2\))

1/\(4.102 * 10^-7\) * 1/ \(1.097 * 10^7\) = (1/4 - 1/\(n_{1} ^2\))

0.22 = 0.25 -  1/\(n_{1} ^2\)

0.22 - 0.25 = -  1/\(n_{1} ^2\)

-0.03 = -  1//\(n_{1} ^2\)

\(n_{1}\) = 6

Using;

f = c/λ

\(3 * 10^8/4.102 * 10^-7 \\f = 7.3 * 10^14 Hz\)

Learn more about Rydberg equation:https://brainly.com/question/22916962

#SPJ1

Answer:

If it turns the paper blue it would have to be a base.

Explanation:

I hope that answers your question!

Answer:

If it turns the paper blue it would have to be a base.

Explanation:

I hope that answers your question!

The correct answer is 10498.3.

The speed of an object is calculated when it moves from one spot to another in time interval t by dividing the distance between the two locations by the time interval. As a result of this definition, the longer it will take the object to travel the specified distance, the greater the separation between the two points.

x = x_0 + (v_x) t

In case of cheetah:

x_0 = 0;

v_c = 97.1 km/h

x = 97.1t _____(1)

In case of gazelle;

x_0 = 52.2 m = 52.2 × 10^-3 km

v_c = 79.2 km/hr

x = 52.2 × 10^-3 + 79.2t ______(2)

equating 1 and 2

52.2 × 10^-3 + 79.2t = 97.1t

52.2 × 10^-3 = 97.1t - 79.2t

52.2 × 10^-3 = 17.9t

52.2 × 10^-3×3600/17.9 = t

t = 10498.3

To learn more about speed, distance and time refer the link:

https://brainly.com/question/10566304

#SPJ9

Answer: The frequency of yellow light is greater that blue light

Explanation: Hope this helps :)

Answer:

You get the SAME answer from both equations:

\(|V_A|=\sqrt{19} \,\,m/s\approx 4.36\,\,m/s\)

Explanation:

Notice that you are dealing with vector equations, and that the first one doesn't give you 5 m/s for the magnitude.

You need to add V0 = 3 (in the x-direction), to

\(V_{AO}=2\,cos(60^o)\,\hat i+ 2\,sin(60^o)\,\hat j\\V_{AO}=2\,\frac{1}{2} cos(60^o)\,\hati + 2\,\frac{\sqrt{3} }{2} \,\hat j\\V_{AO}=1\,\,\hat i + 2\,\sqrt{3} \,\hat j\)

Therefore, the answer for VA from the first equation is:

\(V_A=V_0\,+\,V_{AO}\\V_A=4\,\,\hat i + 2\,\sqrt{3} \,\hat j\\|V_A|=\sqrt{16+3} =\sqrt{19} \approx 4.36\,\,m/s\\\theta = arctan(\frac{\sqrt{3} }{4} )\approx 23.41^o\)

which is exactly what was calculated in the second approach considering from point C.

Answer:

Un'auto si muove lungo un percorso rettilineo con velocità variabile come mostrato in figura. Quando l'auto è in possesso di A, la sua velocità è 10 ms-1 e quando è in posizione B, la sua velocità è 20 ms-1. Se l'auto impiega 5 secondi per spostarsi da A a B, trova l'accelerazione dell'auto.

Explanation:

(a)The units for weight are typically expressed in Newtons (N), while mass is measured in kilograms (kg).

(b)The weight of Curiosity on Earth is approximately 8820 Newtons.

a) The relationship between weight (P) and mass (m) is given by the formula P = m * g, where g represents the acceleration due to gravity. The units for weight are typically expressed in Newtons (N), while mass is measured in kilograms (kg).

b) To calculate the weight of Curiosity on Mars, we need to determine the acceleration due to gravity on Mars. The acceleration due to gravity on Mars is approximately 3.71 m/s². Using the weight formula, we have P = m * g = 900 kg * 3.71 m/s² = 3339 N. Therefore, the weight of Curiosity on Mars is approximately 3339 Newtons.

c) The weight of Curiosity on Earth is significantly greater compared to its weight on Mars. On Earth, the acceleration due to gravity is approximately 9.8 m/s². Using the weight formula, we have P = m * g = 900 kg * 9.8 m/s² = 8820 N. Therefore, the weight of Curiosity on Earth is approximately 8820 Newtons.

The difference in weight between Earth and Mars is important because weight is directly related to the force of gravity. The greater weight on Earth indicates a stronger gravitational force, which affects the overall dynamics and requirements for missions like Curiosity.

It affects the launch and landing processes, the structural integrity of the spacecraft, the fuel and energy requirements, and the ability to conduct experiments and operate the robotic systems effectively. Understanding these differences is crucial for mission planning, spacecraft design, and mission success.

For more questions on Newtons, click on:

https://brainly.com/question/28171613

#SPJ8

The speed of the 5.30-kg object when it has fallen 2.50 m is 3.03 m/s.

In the scenario, the two objects (m1 = 5.30 kg and m2 = 3.50 kg) are connected by a light string passing over a light, frictionless pulley. When the 5.30-kg object is released from rest at a point

h = 4.00 m

above the table, we have to find the tension, acceleration, and speed of the 5.30-kg object. The following are the answers to parts a, b, and c of the given question.a. What is the tension in the string?The tension in the string is equal to the weight of the objects. Therefore, we can calculate the tension in the string as:

$$T = (m_1 + m_2)g$$

Substitute the values to get:Tension

T = (5.30 kg + 3.50 kg) × 9.8 m/s² = 82.6 NAns

The tension in the string is 82.6 N.b. What is the acceleration of the 5.30-kg object?We can calculate the acceleration using the formula:

$$a = \frac{m_1 - m_2}{m_1 + m_2}g$$

Substitute the values to get:Acceleration

a = (5.30 kg - 3.50 kg) / (5.30 kg + 3.50 kg) × 9.8 m/s² = 1.84 m/s²Ans:

The acceleration of the 5.30-kg object is 1.84 m/s².c.

What is the speed of the 5.30-kg object when it has fallen 2.50 m?We can use the formula to calculate the final velocity of an object with constant acceleration. The formula is

v² = u² + 2aswhere:v = final velocityu = initial velocity = 0as = acceleration × distance = 1.84 m/s² × 2.50 m = 4.6 m/s²Substitute the values to get:

v² = 0² + 2 × 1.84 m/s² × 2.50 mv² = 9.2 m²/s²v = √9.2 m²/s² = 3.03 m/sAns:

For more question speed

https://brainly.com/question/13943409

#SPJ8

The equation that relates the forces acting on person to the acceleration of the person in elevator is as : N - mg = ma

An influence that causes the motion of object with mass to change it's velocity is called force.

The equation that relates forces acting on the person to acceleration of the person in elevator is: N - mg = ma

N is normal force exerted on the person by the elevator floor, m is mass of the person, g is acceleration due to gravity, and a is acceleration of the elevator.

This equation is derived from Newton's second law of motion, which states that net force acting on object is equal to its mass times its acceleration. In this case, net force acting on the person is the difference between normal force N and force of gravity mg, which is equal to ma, the product of person's mass and acceleration of the elevator.

To know more about force, refer

https://brainly.com/question/12785175

#SPJ4

Answer:

C

Explanation:

The period of a pendulum is found by the equation: T = 2pi*sqrt(L/g). Let the original length be L and the original period be T. The length increased by a factor of 4, so it’s new length is 4L. We get that the new period is 2pi*sqrt(4L/g) = 2pi*2sqrt(L/g) = 4pi*sqrt(L/g). We can see that the period increased by a factor of 2 because the original period, T, equals 2pi*sqrt(L/g) and the new period is 4pi*sqrt(L/g) = 2(2pi*sqrt(L/g)) = 2T. Therefore, the new period is 2(1.4) = 2.8

I hope this helps! :)

The new period of the pendulum given that the length increased by a factor of 4 is 2.8 s

T = 2π√(L / g)

Where

T = 2π√(L / g)

Square both side

T² = 4π²L / g

Divide both side by L

T² / L = 4π²/ g

Constant => 4π²/ g

T² / L = constant

Thus,

T²₁ / L₁ = T²₂ / L₂

1.4² / L = T²₂ / 4L

1.96 / L = T²₂ / 4L

Cancel out L

1.96  = T²₂ / 4

Cross multiply

T²₂ = 1.96 × 4

T²₂ = 7.84

Take the square root of both side

T₂ = √7.84

T₂ = 2.8 s

Learn more about period of simple pendulum:

https://brainly.com/question/14759840

#SPJ2

The velocity, measured in the Earth reference frame, of an inertial reference frame in which the cat's kinetic energy does not change is equal to the velocity of the skier before the collision. The velocity of the skier before the collision is 15 m/s.

According to the law of conservation of momentum, the total momentum before the collision must be equal to the total momentum after the collision. This can be expressed as m1*v1 + m2*v2 = (m1 + m2)*vf, where m1 and m2 are the masses of the skier and the cat respectively, v1 is the velocity of the skier, and vf is the velocity of the skier and the cat after the collision.

The kinetic energy converted to internal energy in the Earth reference frame can be determined by applying the law of conservation of momentum.

The amount of kinetic energy converted to internal energy can be calculated as follows:

m1*v1 = (m1 + m2)*vf

vf = (m1*v1)/(m1 + m2)

KE = (1/2)*m2*v2²

KE converted = KE initial - KE final

KE converted = (1/2)*m2*v2² - (1/2)*m2*((m1*v1)/(m1 + m2))²

KE converted = (1/2)*m2*v2² - (1/2)*m2*((60*15)/(60 + 5))²

KE converted = (1/2)*5*3.8² - (1/2)*5*(15²/65)

KE converted = 28.8 - 22.15

KE converted = 6.65 J

The velocity, measured in the Earth reference frame, of an inertial reference frame in which the cat's kinetic energy does not change is equal to the velocity of the skier before the collision.

For more questions related to kinetic energy

https://brainly.com/question/8101588

#SPJ1

The kinetic energy of the cylinder and crank at the moment when the bucket is moving with a velocity of 5.0 m/s can be determined by making use of the law of conservation of energy. The law states that the total energy of a closed system remains constant provided that no energy is lost to the surroundings, and this law is applicable for the present scenario since the system consists of the bucket, rope, cylinder, and crank.

According to this law, the initial potential energy (PEi) of the bucket when it is raised to the top of the well is equal to the final kinetic energy (KEf) of the cylinder and crank when the bucket is moving with a velocity of 5.0 m/s.

For such more question on velocity

https://brainly.com/question/80295

#SPJ8

Answer:

an event which took place which had such a significant impact.

Explanation:

Answer:

The human body can be a source of magnetic fields. Charged particles when moving through a magnetic field experiences a force. This magnetic force on a moving charge is at right angles to the velocity which makes it possible to use the knowledge of the magnetic field on charged particles to shield yourself from radiation exposure by staying at a right angle to the velocity of the field since magnetic fields tend to shield moving charged particles that is at a right angle to the field. Though the charged particle’s kinetic energy and speed will remain constant.

Explanation:

A magnetic field is a vector field that is generated whenever an electrical charge is moving,

Answer:

PE = 137.2931 J

Explanation:

PE = 137.2931 J

When filled with extra air its mass increased to 0.428kg also the top of polythene container mass connected to the perplex box of volume 1000cm³ and the number of times of air inside was 7.2 times. The density of the air filled in the polythene container is approximately 1.25 kg/m³.

The density of air filled in the polythene container can be determined by considering the change in mass and volume of the container before and after filling it with air. Given that the mass of the empty container is 0.419 kg and the mass of the container when filled with extra air is 0.428 kg, and the volume of the perplex box is 1000 cm³.

Calculate the mass of the air inside the container by subtracting the mass of the empty container from the mass of the container when filled with air:

Mass of air = Mass of filled container - Mass of empty container

= 0.428 kg - 0.419 kg

= 0.009 kg

Calculate the volume of the air inside the container using the given number of times the air inside is 7.2:

Volume of air = Volume of perplex box * Number of times air inside

= 1000 cm³ * 7.2

= 7200 cm³

Convert the volume of air to cubic meters (m³) by dividing by 1000000:

Volume of air = 7200 cm³ / 1000000

= 0.0072 m³

Calculate the density of air using the formula:

Density = Mass / Volume

Density = 0.009 kg / 0.0072 m³

≈ 1.25 kg/m³

Therefore, the density of the air filled in the polythene container is approximately 1.25 kg/m³.

For more such questions on density, click on:

https://brainly.com/question/6838128

#SPJ8

Answer:

add molecules

So the velocity of light in a material with an index of 2.0 is approximately 149,896,229 m/s.

Velocity is a vector quantity that refers to the rate at which an object changes its position in a particular direction. It is defined as the displacement of an object over time, or in other words, the distance an object moves in a specific direction per unit of time. Velocity is measured in units of distance per time, such as meters per second (m/s) or kilometers per hour (km/h). Unlike speed, which is a scalar quantity that only describes how fast an object is moving without regard to its direction, velocity includes both the speed and the direction of the motion. For example, a car traveling at 60 km/h due east has a velocity of 60 km/h in the eastward direction. A change in velocity can result from a change in speed, direction, or both.

Here,

The velocity of light in a material with an index of refraction n is given by:

v = c/n

where c is the speed of light in a vacuum (approximately 299,792,458 m/s).

Substituting n = 2.0, we get:

v = c/n

= (299,792,458 m/s)/2.0

= 149,896,229 m/s

To know more about velocity,

https://brainly.com/question/14326156

#SPJ1

The particle's velocity and acceleration at t=1 seconds is v = 3 i + 4 j and a = - i - 1 j.

Acceleration is the general term for any process where the velocity changes. There are only two ways to speed up: increasing the speed or changing your direction, or altering both. This happens because velocity is both a velocity and a direction.

Velocity

x= 4t³ + 3t² - 2t⁻¹ and y=6t² - 4

dx/dt = 5 - t

dy/dt = 6 - ½ t²

v = (5 - t) i+ (6 - ½ t²) j ……..(1)

At t = 1 we get

v = (4 - 1) i+ (6 - ½ *1^2) j

v = 3 i + 4 j

Acceleration, using (1)

d/dt(v = (5 - t) i+ (6 - ½ t²) j )

a = - i - t j

at t = 1

a = - i - 1 j

To know more about  acceleration visit:

https://brainly.com/question/12550364

#SPJ9

The centripetal force affecting the body has to be doubled.

1. The centripetal force acting on a body moving in a circular path of radius r with speed v is given by F = mv²/r, where m is the mass of the body.

2. If the speed of the body increases to √2v while moving in the same circular path, the new centripetal force acting on the body can be calculated as follows:

  F' = m(√2v)²/r = 2mv²/r

3. Comparing the new centripetal force F' with the initial centripetal force F, we get:

  F' = 2F

4. As a result, the centripetal force acting on the body must be twice in order for the body to proceed in the same circular direction at 2v.

For more such questions on centripetal force, click on:

https://brainly.com/question/29312275

#SPJ11

The resulting magnetic field of the bolt is 11.8  μT.

Magnetic field is the region or space around which a magnetic force can be felt or experienced.

To calculate the magnetic field of the lightning bolt, we use the formula below

⇒ Formula:

⇒ Where:

From the question,

⇒ Given:

Substitute these values into equation 1

Hence, the resulting magnetic field of the bolt is 11.8  μT.

Learn more about magnetic field here: https://brainly.com/question/14411049

#SPJ1

After the impact, the two players are moving side by side at a speed of roughly 4.12 m/s.

Momentum is never created or destroyed inside a problem domain, according to the principle of momentum conservation. Momentum is only changed by the action of forces as they are described by Newton's equations of motion.

\(p1 = m1 * v1 + m2 * v2\)

\(p1 = 165 kg * 0 m/s + 178 kg * 8 m/s = 1424 kg*m/s\)

\(p2 = (m1 + m2) * v\)

Substituting the values, we get:

\(p2 = (165 kg + 178 kg) * v = 343 kg * v\)

Since the total momentum is conserved, we can equate p1 and p2:

p1 = p2

\(165 kg * 0 m/s + 178 kg * 8 m/s = 343 kg * v\)

\(v = (165 kg * 0 m/s + 178 kg * 8 m/s) / 343 kg ≈ 4.12 m/s\)

To know more about speed visit:-

https://brainly.com/question/28224010

#SPJ1

Answer:2

Explanation:When the ball is released from the top of the hill then it's initial velocity (u)=0 And it's final velocity will be after 5 second (v)=2.

Answer:

Explanation:

a ball is placed at the top of the hill and then released after five seconds and has a speed of 20 m/s. What is the average acceleration of the ball?

Answer:

Only magnetic field present

Explanation:

Since, the positively charged particle does not speed up or slow down, but it does deflect in the downward direction.  This means only magnetic field is present.

This is because electric field changes the velocity and magnetic field changes the direction.

The magnetic force F is given by

F = qvBsinθ

Where, q = charge magnitude, v = velocity of charge, B = strength of magnetic field. and θ =the angle between the directions of v and B.