Karissa is conducting an experiment on the amount of salt that dissolves in water at different temperatures. What can Karissa do to increase confidence in the results of her experiment? Check all that apply. Have another scientist run the same exact procedure in her lab include several other liquids for comparison e calculate the average amount of salt that dissolves to summarize findings test water temperature many times with the same procedure make sure the experiment follows a specific procedure that allows other scientists to produce the same findings

Answer:

Explanation:

Before the collision, the lorry has a momentum of:

p1 = m1v1 = 8000 kg * 20 m/s = 160000 kgm/s

where m1 is the mass of the lorry and v1 is its velocity.

The car is initially at rest, so its momentum is:

p2 = m2*v2 = 0

where m2 is the mass of the car and v2 is its velocity.

After the collision, the two vehicles move together with a common velocity v. The total momentum of the system after the collision is:

p = (m1 + m2)*v

where m1 + m2 is the total mass of the system.

By the law of conservation of momentum, the total momentum before and after the collision is the same. So we have:

p1 + p2 = p

Substituting the values we have:

160000 kg*m/s + 0 = (8000 kg + 1000 kg)*v

Simplifying:

v = (160000 kg*m/s) / (9000 kg)

v = 17.78 m/s

Therefore, the velocity of the lorry and car together after the collision is 17.78 m/s.

Answer:

Height and Velocity Functions

Explanation:

Multiply the height by 2, and divide the result by the object's acceleration due to gravity. If the object fell from 5 m, the equation would look like this: (2*5 m)/(9.8 m/s^2) =1.02 s^2.

Answer:

250 mL

Explanation:

Receptacle is defined as a point in the electrical system where electrical energy is Installed.

The Latin term receptaculum, which denotes a location to receive and keep items, is the source of the English word "receptacle."

Receptacles and electrical outlets are types of sockets that are used to create an electrical connection between a power source and an electronic device.

There are several different types of outlets, including two-pronged outlets, grounded outlets, tamper-resistant outlets, arc fault circuit interrupter outlets, surge suppression outlets, and USB outlets.

According to Section 210.52 of the US National Electrical Code, every kitchen, bedroom, living room, family room, and other room with a designated living area must have an electrical outlet. They must be placed at intervals of no less than twelve feet along the floor line.

Correct option: (B) Installed

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Answer:

Water

Explanation:

I dont have enough data to answer this question, but im going to assume its water. Because its a plant. Thats all they drink

Velocity is vector quantity because it has both magnitude and direction.

Explanation:

velocity is a vector quantity because the person always returns to the original position,the motion would never result in a change in a position.

angle to the shore should a person navigate a boat, which is maintaining a constant speed of 16 km/h, in order to reach a point directly opposite is 75.5 degrees.

Since the stream is flowing parallel alongside the shore, it takes the vector form of  v {stream} = [0,4]

the boat velocity is perpendicular to the stream, it's takes the vector form of  v{boat} = [-16,0]

The resultant velocity of the boat is the sum of the velocity of the boat and stream, thus it takes the form

v{total} =  [-16,0] +  [0,4]

           = [ -16,4]

the cosine of angle to the shore,

                  cos {theta} = v{total} . v {stream} / ||v{total} || x ||v {stream}||

                                     =  [ -16,4] . [0,4] / (16x4)

                                     = 16/64

                                     = 0.25

                       angle = 75.7 degrees.

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Answer:

Avg. Velocity = 10 m/s

Acceleration =  2 m/s^2

Distance = 100 m

Explanation:

First, we need to convert the velocity of the car from km/h to m/s, since the standard unit of velocity in SI units is meters per second.

72 km/h = 20 m/s (to 2 significant figures)

We can now calculate the average velocity of the car using the formula:

average velocity = total distance ÷ total time

Since the car starts from rest, its initial velocity is 0 m/s. Therefore, the total distance it travels during the 10 seconds is:

distance = (1/2) × acceleration × time²

where acceleration is the constant acceleration of the car during the 10 seconds, which we do not know yet.

To find the acceleration, we can use the formula:

final velocity = initial velocity + acceleration × time

The final velocity of the car is 20 m/s (which we calculated earlier), the initial velocity is 0 m/s, and the time is 10 seconds. Therefore:

20 m/s = 0 m/s + acceleration × 10 s

Solving for acceleration:

acceleration = 2 m/s²

Substituting this value of acceleration into the formula for distance, we get:

distance = (1/2) × 2 m/s² × (10 s)² = 100 meters

Therefore, the average velocity of the car during the 10 seconds is:

average velocity = total distance ÷ total time = 100 meters ÷ 10 seconds = 10 m/s

The acceleration of the car during the 10 seconds is 2 m/s², and the distance travelled by the car during this period is 100 meters.

Answer:

So it's clear that Earth's hot iron core isn't what creates the magnetic field around our planet. ... On Earth, flowing of liquid metal in the outer core of the planet generates electric currents. The rotation of Earth on its axis causes these electric currents to form a magnetic field which extends around the planet

Explanation:

As stars get bigger and brighter, the closer they are to their end of life.

Because they have already used all the elements they can in nuclear fusion. Iron cannot be fused, its too heavy.

The most accurate graph here would be the third one.

The magnetic force on the proton is 1.24 x \(10^-12\) N in the negative z-direction.

The magnetic force on a charged particle moving in a magnetic field is given by:

F = q * v * B * sin(θ)

where q is the charge of the particle, v is its velocity, B is the magnetic field, and θ is the angle between the velocity and the magnetic field.

In this case, the proton has a charge of \(+1.6 x 10^-19 C,\) a velocity of 4.46 x \(10^6\) m/s in the positive x-direction, and is moving in a magnetic field of 1.75 T in the positive y-direction. The angle between the velocity and the magnetic field is 90 degrees, since the proton is moving perpendicular to the magnetic field.

Substituting the values, we get:

F = (1.6 x \(10^-19\) C) * (4.46 x \(10^6\) m/s) * (1.75 T) * sin(90°)

F = 1.24 x \(10^-12\)N

The direction of the force can be determined using the right-hand rule. If you point your right thumb in the direction of the velocity (positive x-direction) and your fingers in the direction of the magnetic field (positive y-direction), then the direction of the force will be perpendicular to both, pointing in the negative z-direction.

Therefore, the magnetic force on the proton is 1.24 x \(10^-12\)N in the negative z-direction.

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the answer is a molecular contact I am pretty sure

Scientific investigation asks about a cause-and-effect relationship between two variables. Thus, the correct answer is (a).

Scientific investigation is intended to create a hypothesis and demonstrate its validity or lack thereof. Experiments must be conducted in order to test these hypotheses, and these experiments are planned in accordance with the discovery of a cause-and-effect relationship between the two variables under scientific investigation. In these experiments, the "cause" is variable upto various degrees, and the "effect" of the variance is noted. The experimental design, which will try to manipulate the causes to see how these manipulations impact the second variable, will thus be guided by knowledge of the cause-and-effect connection.

Observations are frequently the first step in a scientific investigation.

An observation is something that is discovered using the senses of humans or tools and measurement technologies that support the senses of humans. Important scientific discoveries may result from unintentional observations.

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The cable can withstand a tensile stress of up to 3265 N.

It is appropriate to use the terms "push" or "pull" to describe a force at this moment. A power that something "contains" or "has in it" does not exist. A force is exerted on one item by another. The definition of a force includes both living and non-living things.

Here, T is the cable's tension force, m is the elevator's mass, g is gravity's acceleration (9.81 m/s2), and an is the elevator's upward acceleration.

The elevator's net force is supplied by:

Fnet = Fg + Fa

The sources of the gravitational pull are:

Fg = m * g

 = 250.0 kg * 9.81 m/s²

 = 2452.5 N

The force due to the elevator's acceleration is given by:

Fa = m * a

 = 250.0 kg * 3.25 m/s²

 = 812.5 N

The net force on the elevator is therefore:

Fnet = Fg + Fa

    = 2452.5 N + 812.5 N

    = 3265 N

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Between 0 degrees Celsius and 8 degrees Celsius, a red-dyed-water-in-glass thermometer would indicate the temperature within that range.

Red-dyed-water-in-glass thermometers work based on the principle that liquids expand or contract with changes in temperature.

The amount of expansion or contraction is directly proportional to the temperature change.

This principle is used to measure the temperature of the liquid or surrounding environment.

At 0 degrees Celsius, the liquid inside the thermometer will have contracted to the smallest volume, indicating the lowest temperature on the calibrated scale.

As the temperature increases, the liquid will expand and move up the glass tube, indicating a higher temperature on the scale.

At 8 degrees Celsius, the liquid inside the thermometer will have expanded to a volume corresponding to that temperature, indicating the higher temperature on the calibrated scale.

Therefore, a red-dyed-water-in-glass thermometer between 0 degrees Celsius and 8 degrees Celsius would accurately indicate the temperature within that range, based on the expansion and contraction of the liquid inside the thermometer.

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The kinetic energy of the bullet is 2K, twice the kinetic energy of bullet 1.

The kinetic energy of an object is the energy possessed due to its motion. The kinetic energy of an object of mass m moving with a velocity v is given by K = mv²/2 ( in joules)

Given: kinetic energy of bullet 1 = K =m₁×v²/2  

mass of bullet 2, m₂ = twice of mass of bullet 1, m₁

m₂ = 2 × m₁

the kinetic energy of bullet 2 is = m₂ × v²/2 , since speed are same.

in terms of m1,

kinetic energy of bullet 2 = 2m₁ × v²/2 = 2K

Therefore, the kinetic energy of the bullet is 2K, twice the kinetic energy of bullet 1.

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The tension in the string connecting the two blocks and tension in the string that is tied to the wall. (T_1) is approximately 19.6 N, and the coefficient of friction (μ) is approximately 2.331.

m_lower = 1.0 kg

m_upper = 2.0 kg

θ = 31 degrees

g = 9.8 m/s²

We can solve these equations to find the values of T_1 and μ.

Equation 1: T_1 - μ * W_lower * cos(θ) = 0

Equation 2: T_1 - W_upper = 0

We can solve Equation 2 for T_1 and substitute it into Equation 1 to eliminate T_1. Let's proceed with the calculations:

Solve Equation 2 for T_1:

T_1 = W_upper

Substituting the values:

T_1 = m_upper * g

T_1 = 2.0 kg * 9.8 m/s²

T_1 = 19.6 N

Substitute T_1 into Equation 1:

19.6 N - μ * W_lower * cos(θ) = 0

Now we can solve this equation for the coefficient of friction (μ):

μ * W_lower * cos(θ) = 19.6 N

Substituting the values:

μ * 1.0 kg * 9.8 m/s² * cos(31°) = 19.6 N

Simplifying:

μ * 9.8 m/s² * cos(31°) = 19.6 N

μ * 9.8 m/s² * 0.857 = 19.6 N

μ * 8.4066 = 19.6 N

μ ≈ 2.331

Therefore, the tension in the string connecting the two blocks and tension in the string that is tied to the wall (T_1) is approximately 19.6 N, and the coefficient of friction (μ) is approximately 2.331.

The figure is attached in the image below.

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Answer:

I=V/R

Explanation:

Ohm's law gives the mathematical relationship between, current, voltage and the resistance of the circuit. Its mathematical form is given by :

V = IR ....(1)

V = voltage (in volts)

I = current (in Ampere)

R = resistance (in ohms)

Equation (1) can be rewritten as :

\(I=\dfrac{V}{R}\)

Hence, the correct relation is I=V/R.

This is the total thrust of the engines is d) 40,000 N.

In order to solve this problem, we need to use the formula:

F = m x a where, F = force (thrust), m = mass and a = acceleration

The mass of the business jet is 24,000 kg. Each engine provides a thrust of 20,000 N. Therefore, the total thrust of the engines is:

F = 2 x 20,000 NF = 40,000 N

Thus, the correct option is d) 40,000 N. This is the total thrust of the engines

Jet engines work by sucking in air through a fan, compressing it, mixing it with fuel, burning it to cause a rapid expansion of gases, and then expelling it as exhaust at the back. This exhaust propels the plane forward, creating thrust that moves it through the air. The amount of thrust generated by a jet engine depends on several factors, including the size and design of the engine, the fuel used, and the altitude and temperature of the air. Airplanes are generally designed to take off with more power than they need to sustain flight. This is because they need to overcome the force of gravity to lift off the ground, and they also need to accelerate quickly to reach a safe flying speed. Once they are airborne, they can reduce the power of the engines to a more efficient level that allows them to conserve fuel and fly longer distances. Jet engines have revolutionized air travel by making it faster, safer, and more convenient. They have enabled planes to fly higher, faster, and farther than ever before, and have made it possible for people to travel around the world in a matter of hours rather than days or weeks. Today, there are many different types of jet engines used in various applications, including commercial airliners, military jets, and private business jets.

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Answer:

True Edg2020

Explanation:

Answer: true

Explanation:

because I say so :P

(a) The increase in length of the rod can be found using the formula:
ΔL = αLΔT
where ΔL is the change in length, α is the coefficient of linear expansion, L is the original length, and ΔT is the change in temperature.
Substituting the given values, we get:
ΔL = (9.00 x 10^-6 (°C)^-1)(30.0 cm)(65.0°C)
ΔL = 0.0176 cm
Therefore, the increase in length of the rod is 0.0176 cm.

(b) The increase in diameter of the rod can be found using the formula:
ΔD = αDΔT
where ΔD is the change in diameter, α is the coefficient of linear expansion, D is the original diameter, and ΔT is the change in temperature.
Substituting the given values, we get:
ΔD = (9.00 x 10^-6 (°C)^-1)(1.50 cm)(65.0°C)
ΔD = 0.000878 cm
Therefore, the increase in diameter of the rod is 0.000878 cm.

(c) The increase in volume of the rod can be found using the formula:
ΔV = αVΔT
where ΔV is the change in volume, α is the coefficient of linear expansion, V is the original volume, and ΔT is the change in temperature.
The original volume of the rod can be calculated using the formula for the volume of a cylinder:
V = πr^2L
where r is the radius of the rod, and L is the length of the rod.
Substituting the given values, we get:
V = π(0.75 cm)^2(30.0 cm)
V = 530.93 cm^3
Substituting the values for α, V, and ΔT, we get:
ΔV = (9.00 x 10^-6 (°C)^-1)(530.93 cm^3)(65.0°C)
ΔV = 0.312 cm^3
Therefore, the increase in volume of the rod is 0.312 cm^3.

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Conversion of electromagnetic (EM) energy from the sun into other forms of energy occurs for the following options:

a. Biofuels

c. Solar thermal power

e. Wind power (EM to air movements)

A- Biofuels: During photosynthesis, plants capture electromagnetic energy from the sun and convert it into chemical energy, stored in the bonds of organic molecules, such as glucose. This process allows for the conversion of EM energy to chemical energy in the form of biofuels.

c. Solar thermal power: Solar thermal power plants use mirrors or lenses to concentrate sunlight, which is then converted into heat energy. This thermal energy can be used to generate steam, which drives a turbine and produces mechanical energy.

e. Wind power: Wind turbines harness the kinetic energy of moving air, which is ultimately driven by the sun's uneven heating of the Earth's surface. The sun's energy heats the atmosphere, creating temperature and pressure gradients that result in wind currents.

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the closest answer to the given options is: D.) -297 degrees Fahrenheit

The answer is B.) -217 degrees Fahrenheit.

To convert from Kelvin to Fahrenheit, you can use the following formula:

°F = (K - 273.15) x 1.8 + 32

Plugging in 90 K for K, we get:

°F = (90 - 273.15) x 1.8 + 32
°F = (-183.15) x 1.8 + 32
°F = -329.67 + 32
°F = -297.67

Therefore, the answer is D.) -297 degrees Fahrenheit.
To convert the temperature from Kelvin to Fahrenheit, you can use the following formula:

°F = (K - 273.15) * 9/5 + 32

Given that oxygen condenses into a liquid at approximately 90 K, you can find the corresponding temperature in Fahrenheit:

°F = (90 - 273.15) * 9/5 + 32 ≈ -297.67

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Answer:

Its true

Explanation:

Answer:

Line A is fastest and Line D is slowest

Explanation:

Line A is the fastest moving object because the bar is steepest. Line A travelled the furthest in the least time, so Line A is moving fastest. Line D is the slowest object because the bar is least steep. Line D travelled the least distance in the most time, so Line D moves the slowest.

Hopefully the answer and explanation helps!

At time t = 0, the velocity and acceleration of an object are represented by the equations a. (t) = 8 hati + 0 hatj - 0 hatk, and a. (0) = 8 hati + 0 hatj - 0 hatk.

The particle position is given as

\underset{r}{\rightarrow}(t) = 4 t2\hat{i} + 2.4 \hat{j} - 5.6 t \hat{k}

velocity is given as the derivative of position relative to time

1 (t) = dx(t)/dt

1 (t) = (d/dt) (4 t2\hat{i} + 2.4 \hat{j} - 5.6 t \hat{k})

1 (t) = (8t) \hat{i} + 0 \hat{j} - 5.6 \hat{k}

acceleration is given as the derivative of velocity relative to time

a. (t) = d1 (t)/dt

a. (t) = (d/dt) ((8t) \hat{i} + 0 \hat{j} - 5.6 \hat{k})

a. (t) = 8 \hat{i} + 0 \hat{j} - 0 \hat{k}

velocity is given as

1 (t) = (8t) \hat{i} + 0 \hat{j} - 5.6 \hat{k}

at t = 0

1 (0) = (8(0)) \hat{i} + 0 \hat{j} - 5.6 \hat{k}

1 (0) = 0\hat{i} + 0 \hat{j} - 5.6 \hat{k}

acceleration is given as

a. (t) = 8 \hat{i} + 0 \hat{j} - 0 \hat{k}

at t = 0

a. (0) = 8 \hat{i} + 0 \hat{j} - 0 \hat{k}

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Answer:

Using V= IR

I= 0.2307 Ampere

Answer:

C,D

Explanation:

an image is created based on the amont of time it takes for a sound wave to return

Tissues in the babys body reflect high-frequency sound waves

In ultrasound scanning, an image of internal organs is created based on the amount of time it takes for a sound wave to return.Thus, option C is correct.

High-frequency sound waves are used in ultrasound imaging, also known as sonography, to view within the body. Real-time ultrasound imaging allows for the display of blood flowing via blood vessels as well as movement of the body's internal organs.

Contrary to X-ray imaging, ultrasonic imaging does not expose patients to ionizing radiation.A transducer (probe) is positioned either on the skin or inside a bodily orifice during an ultrasonic examination.

To allow the ultrasonic waves from the transducer to pass through the gel and into the body, a small coating of gel is placed to the skin.

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1.When the non-sticky sides of the two pieces of tape recording are brought together, they repel each other. This is due to the buildup of electric charge on the  face of the tape recording when it was  hulled off from the flat  face.

2.The pieces didn't change when the tape recording was from different sets.  When two top or two  nethermost pieces of tape recording are brought together, they repel each other.

3.When a top and  nethermost piece of tape recording are brought together, they attract each other. This is  harmonious with the actuality of only two types of charge, positive and negative. The results support the fact that the top and  nethermost pieces of tape recording had  contrary charges.  The top tape recording attracted the arm hair, while the bottom tape recording didn't attract the arm hair. Arm hair is  generally neutral, but it can be  concentrated by the electric field of the charged tape recording.

4.The top tape recording is negatively charged, and it  concentrated the arm hair, which has a positive charge. This redounded in  magnet between the top tape recording and the arm hair.  The pieces of tape recording labeled" T1" and" B2" are  appreciatively charged, while the pieces of tape recording labeled" B1" and" T2" are negatively charged. This can be determined from the  compliances.

5.When the  appreciatively charged tape recording was brought  near to a negatively charged tape recording, they attracted each other. When two  appreciatively charged  videotapes or two negatively charged  videotapes were brought  near together, they repelled each other.  Like charges repel each other,  contrary charges attract each other, and neutral bodies aren't affected by electric fields.  

6.The force of  magnet or aversion between the pieces of tape recording increases as they get  near together and decreases as they move  further  piecemeal. This change happens gradationally, not  snappily.      

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Answer: it’s A

Explanation: hope this is right!!!!