Answer:
they are more spread out and moving faster than those at the surface
Explanation:
fast easy and you don't have to read a whole book for the answer
Final answer:
Water molecules closest to the burner are more spread out and moving faster due to increased kinetic energy that leads water to transition from liquid to gas at the boiling point. This contrasts with the surface molecules that move less rapidly.
Explanation:
When boiling occurs in water, as the water molecules closest to the burner receive heat, they gain energy and move faster than the molecules at the surface. In this energized state, the molecules start moving more rapidly and become more spread out because the heat imparts kinetic energy to them, which is necessary to overcome the attractive forces between the water molecules. This increase in kinetic energy is what leads water to transition from the liquid phase to the gas phase at the boiling point.
Therefore, the water molecules closest to the burner are more spread out and moving faster than those at the surface of the liquid. Since the water at the boiling point has the water molecules throughout it gaining sufficient kinetic energy to vaporize, this agitation results in the formation of bubbles, which is a hallmark of the boiling process. At the surface, however, the evaporation is occurring at a lower rate than the boiling within the bulk of the liquid. Consequently, the surface molecules are not moving as rapidly as those at the bottom near the burner.
SELECT ALL THE CORRECT ANSWERS
a strong magnetic field surrounds Earth. How does Earth’s magnetic field help humans?
a. it holds people’s belongings thigh to the Earth’s surface.
b. it’s responsible for cycling water through Earth’s four spheres.
c. it keeps the solar wind from reaching Earth.
d. it helps people navigate using a compass.
e. it helps cool Earths surface.
Earth's magnetic field protects from solar wind, aids navigation with a compass, and creates the Aurora Borealis. the correct options are c & d.
Earth's magnetic field protects humans from harmful solar wind by deflecting most of it, preventing damage to life on Earth. The magnetic field also aids navigation through the use of a compass, guiding people in finding direction accurately.
The Aurora Borealis, or Northern Lights, is an awe-inspiring light display resulting from disturbances within Earth's magnetic field caused by solar storms.
(i) a force of 35.0 n is required to start a 6.0-kg box moving across a horizontal concrete floor, (a) what is the coefficient of static friction between the box and the floor? (b) if the 35.0-n force continues, the box accelerates at 0.60 m/s2. what is the coefficient of kinetic friction?
a. The force applied would be equal to the frictional force.
F = us Fn
where, F = applied force = 35 N, us = coeff of static friction, Fn = normal force = weight
35 N = us * (6 kg * 9.81 m/s^2)
us = 0.595
b. The force applied would now be the sum of the frictional force and force due to acceleration
F = uk Fn + m a
where, uk = coeff of kinetic friction
35 N = uk * (6 kg * 9.81 m/s^2) + (6kg * 0.60 m/s^2)
uk = 0.533
The coefficient of static friction between the box and the floor is 0.60
The value of coefficient of kinetic friction is 0.061
Given data:
The magnitude of force to start the box is, F = 35.0 N.
The mass of box is, m = 6.0 kg.
The magnitude of acceleration is, [tex]a = 0.60 \;\rm m/s^{2}[/tex].
(a)
The force due to static friction is given as,
[tex]f = \mu mg[/tex]
Here, [tex]\mu[/tex] is the coefficient of static friction.
Solving as,
[tex]35.0= \mu \times 6 \times 9.8\\\mu \approx 0.60[/tex]
Thus, the coefficient of static friction between the box and the floor is 0.60.
(b)
If box accelerates, the frictional force comes to play to oppose the motion. Therefore,
[tex]f = F\\\mu_{k} \times m\times g = ma\\\mu_{k}\times g = a\\\mu_{k}\times 9.8 = 0.60\\\mu_{k} = 0.061[/tex]
Thus, the value of coefficient of kinetic friction is 0.061.
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A skipper on a boat notices wave crests passing his anchor chain every 10 s. he estimates the distance between wave crests to be 15 m. he also correctly estimates the speed of the waves. what is this speed?
A particles move 4m east, then 2m west. calculate the total distance and the displacement of the particles
Which of the following is not a principle of relative-age dating? A. Sediments are deposited in lateral sheets. B. If one rock contains pieces of another, the pieces are older. C. If one geological feature cuts across another, the feature cutting across is older. D. In undisturbed rock layers, the oldest rocks are on the bottom.
Is there a correlation between moonrise and high tide?
A passenger at the rear of a train traveling at 15 m/s relative to earth throws a baseball with a speed of 15 m/s in the direction opposite the motion of the train. what is the velocity of the baseball relative to the earth as it leaves the thrower’s hand?
Answer:
0
Explanation:
Diane rows a boat at 8.0 m/s directly across a river that flows at 6.0 m/s.
a.what is the resultant speed of the boat?
Final answer:
The resultant speed of the boat as it crosses the river, considering both its own speed and the river's current speed, is calculated using the Pythagorean theorem, resulting in a resultant velocity of 10.0 m/s.
Explanation:
The student's question revolves around determining the resultant velocity of a boat trying to cross a river when it rows at a certain speed perpendicular to the river's current. Given that Diane rows the boat at 8.0 m/s directly across a river, which has a flow speed of 6.0 m/s, we are tasked with finding the resultant speed of the boat. This scenario is a practical example of vector addition where the boat's speed and the river's flow speed are orthogonal (right angle to each other).
To find the resultant velocity, we apply the Pythagorean theorem since the velocities are perpendicular. The formula is:
Resultant velocity (v) = √(vboat2 + vriver2)
Where boat is the velocity of the boat relative to the water (8.0 m/s), and river is the velocity of the water (6.0 m/s).
By substituting the given values:
v = √((8.0)2 + (6.0)2) = √(64 + 36) = √100 = 10.0 m/s
Therefore, the resultant speed of the boat as it crosses the river is 10.0 m/s.
Why must scientists often deal with politics?
Answer:Governments can pass laws about scientific research
Explanation:
The federal government has developed the body mass index (bmi) to determine ideal weights. a person's bmi is directly proportional to his or her weight in pounds and inversely proportional to the square of his or her height in inches. (a bmi of 19 to 25 corresponds to a healthy weight.) a 6-foot-tall person weighing 177 lb has bmi 24. find the bmi (to the nearest whole number) of a person whose weight is 180180 lb and whose height is 7575 in.
Answer:
The BMI of a person whose weight is 180 lb and whose height is 75 inches is 22.
Explanation:
According to question , BMI is directly proportional to weight in pounds and inversely proportional to the square of height inches.
[tex]BMI\propto \frac{w}{h^2}[/tex]
[tex]BMI=k\times \frac{w}{h^2}[/tex]
BMI = body mass index
w = weight of person in pounds
h = height of the person inches.
BMI of a 6-foot-tall person weighing 177 lb = 24
w = 177 lb , h = 6 feet = 72 inches
1 feet = 12 inches
[tex]24=k\times \frac{177 lb}{(72 inches)^2}[/tex]
[tex]k=\frac{24\times (72 inches)^2}{177 lb}[/tex]
BMI of a 75 inhces person weighing 180 lb = BMI'
w = 180 lb , h = 75 inches
[tex]BMI'=k\times \frac{180 lb}{(75 inches)^2}[/tex]
Substitute value 'k' calculated above:
[tex]BMI'=\frac{24\times (72 inches)^2}{177 lb}\times \frac{180 lb}{(75 inches)^2}[/tex]
[tex]BMI'=22.493\approx 2[/tex]
The BMI of a person whose weight is 180 lb and whose height is 75 inches is 22.
The BMI of a person weighing 180 lbs with a height of 75 inches is approximately 23.
The Body Mass Index (BMI) is calculated by dividing a person's weight in pounds by their height in inches squared, then multiplying by 703.
Given that BMI is directly proportional to weight and inversely proportional to the square of height, let's determine the BMI for a person weighing 180 lbs and height 75 inches.
We can use the given information to set up the formula:
BMI = 703 * weight (lbs) / [height (in)]²First, calculate the BMI for the provided example:
BMI = 703 * 177 / 72²BMI = 703 * 177 / 5184BMI ≈ 24Now, calculate the BMI for the new values:
BMI = 703 * 180 / 75²BMI = 703 * 180 / 5625BMI ≈ 22.5Rounding to the nearest whole number, the BMI is 23.
The magnitude of the vectors f~ is 27 n, the force on the right is applied at an angle 58◦ and the the mass of the block is 54 kg. 54 kg f 58 ◦ f if the surface is frictionless, what is the magnitude of the resulting acceleration? answer in units of m/s 2 .
The magnitude of the resulting acceleration is 0.265 m/sec².
What is acceleration?The rate at which an item changes its velocity is known as acceleration, a vector quantity. If an object's velocity is changing, it is acceleration.
The net acceleration that objects get as a result of the combined action of gravity and centrifugal force is known as the Earth's gravity, or g. It is a vector quantity whose strength or magnitude is determined by the norm and whose direction correlates with a plumb bob.
Given the magnitude of the vectors f~ is 27 n, the force on the right is applied at an angle 58◦ and the the mass of the block is 54 kg. 54 kg f 58 ◦ f if the surface is friction less,
F cos(58) = ma
14.30 = 54.a
a = .265 m/sec²
The magnitude of the resulting acceleration is 0.265 m/sec².
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A researcher wants to find out the values and opinions of a group of high school freshmen. What is the best method to use?
Take a survey.
Conduct a case study.
Design an experiment.
Prepare a longitudinal study.
Yes the answer is A
Answer: A
Explain how the existence of isotopes is related to atomic masses not being whole numbers
Isotopes, which are atoms of the same element with different numbers of neutrons, cause atomic masses to be non-whole numbers since atomic mass is a weighted average of the isotope masses based on their abundances.
Explanation:The existence of isotopes is directly related to atomic masses not being whole numbers. Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons, leading to different mass numbers. The atomic mass of an element is the weighted average of the masses of its isotopes, based on their relative abundance. This is why atomic masses on the periodic table are not whole numbers.
For example, chlorine has two main isotopes with mass numbers of 35 (17 protons and 18 neutrons) and 37 (17 protons and 20 neutrons). The atomic mass of chlorine is 35.45, which reflects the weighted average of these isotopes, with the more abundant isotope having a greater influence on the final atomic mass.
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A block is given a very brief push up a 20.0° frictionless incline to give it an initial speed of 12.0 m/s. (a) how far along the surface of the plane does the block slide before coming to rest?
To determine the distance along the surface of the incline that the block slides before coming to rest, use the equations of motion. Find the acceleration using Newton's second law and then use the equation of motion to find the distance.
Explanation:To determine the distance along the surface of the incline that the block slides before coming to rest, we can use the equations of motion. Since the incline is frictionless, the only force acting on the block is its weight component parallel to the incline. The acceleration of the block can be found using Newton's second law, and then we can use the equation of motion to find the distance.
First, let's find the acceleration. The weight component parallel to the incline is given by:
FPARALLEL = m x g x sin(theta)
where m is the mass of the block, g is the acceleration due to gravity, and theta is the angle of the incline.
Next, we can use Newton's second law to determine the acceleration:
m x a = FPARALLEL
a = PARALLEL / m
Once we have the acceleration, we can use the equation of motion to find the distance (s) traveled by the block:
s = (v02 - v2) / (2 x a)
where v0 is the initial velocity of the block and v is the final velocity (zero in this case, as the block comes to rest).
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The recommended adult dose of elixophyllin a drug used to treat asthma, is 6.00 mg/kg of body mass. calculate the dose in milligrams for a 115-lb person
The required dosage of drugs for 115-lb person is 312.90 mg.
Given data:
The dosage of drug is, p = 6.00 mg/kg body mass.
The given problem is based on the concentration of drugs required for the given mass of body.
According to the question,
1 kg mass of body = 6.00 mg of drug concentration
And we are given the weight of person as 115 lb.
So, convert this value of pound into kg as,
1 lb = 0.4535 kg
[tex]m = 115 \times 0.4535\\\\m = 52.15 \;\rm kg[/tex]
So, the dosage of drug required for the 52.15 kg of mass is,
[tex]p' = m \times p\\\\p' = 52.15 \times6.00\\\\p' = 312.90 \;\rm mg[/tex]
Thus, we can conclude that the required dosage of drugs for 115-lb person is 312.90 mg.
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The elixophyllin dose for a 115-lb person is 313 mg to avoid overdosing.
Total body mass = 6.00 mg/kg
To calculate the dose of elixophyllin for a 115-lb person, firstly, we need to convert the person's weight from pounds to kilograms.
Knowing that 1 pound is equivalent to 0.453592 kilograms, we do the following calculation:
115 lbs x 0.453592 kg/lb
= 52.16258 kg
Next, we use the recommended dose which is 6.00 mg of elixophyllin per kilogram of body mass:
6.00 mg/kg x 52.16258 kg
= 313.97548 mg
To ensure we provide a safe dose and avoid overdosing, we generally round down to the nearest whole number.
Thus, the appropriate dose for a 115-lb adult would be 313 mg of elixophyllin.
If your weight is 120 pounds and your mass is 54 kilograms how would those values change if you were on the moon
Final answer:
On the Moon, your mass of 54 kilograms would not change, but your weight would decrease to approximately 19.84 pounds due to the lower gravitational pull of the Moon which is 1.625 m/s².
Explanation:
If your weight is 120 pounds on Earth and your mass is 54 kilograms, your mass will remain the same on the Moon, but your weight will change because the Moon's gravitational pull is weaker. The acceleration due to gravity on the Moon is approximately 1.625 m/s², compared to Earth's 9.80 m/s². To calculate your new weight on the Moon, you can use the ratio of the Moon's gravity to Earth's gravity.
First, convert your weight from pounds to Newtons (N) to get the force of gravity on Earth. Then, multiply this force by the ratio of the Moon's gravity to Earth's gravity (1.625/9.80). Finally, convert back to pounds to find your weight on the Moon.
On the Moon, you would weigh roughly 19.84 pounds, but your mass of 54 kilograms would remain unchanged.
The thickness of 25 pages of a physics textbook is 2 mm. How would you find the thickness, in mm, of 1 page?
A penny is dropped into a well. It takes 5 seconds to fall. Calculate the depth of the well in feet.
A - 400
B - 300
C - 100
According to the universal law of gravitation the force of attraction between two objects depends on the masses of the objects and the what
One problem with wind energy as a major source of electricity is _____. (1 point)
the problems that harnessing wind for energy is the expense of large tracts of land in populated areas.
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An object is suspended from the ceiling with two wires that make an angle of 40° with the ceiling. The weight of the body is 150 N. What is the tension in each wire?
Answer: 117
Explanation:
What is the net force on a bright red mercedes convertible traveling along a straight road at a steady speed of 100 hm/h?
how can you find out whether copper is harder of softer than the plastic used in a plastic cup
To determine if copper is harder than the plastic of a cup, a scratch test can be performed where copper is used to scratch the plastic. If the copper marks the plastic, it's harder; no mark indicates the plastic is harder.
Explanation:To find out whether copper is harder or softer than the plastic used in a plastic cup, you can perform a scratch test. This involves trying to scratch the surface of the plastic cup with a piece of copper. If the copper leaves a mark, it is harder than the plastic. If not, then the plastic is the harder material. As copper is a metal with a relatively well-defined hardness on the Mohs scale, it's expected to be harder than most common plastics which are lower on the scale and tend to be softer. However, the scratch test results might vary based on the type of plastic used in the cup.
It's important to consider the physical and chemical properties of both materials to understand their relative hardness. Unlike measuring thermal conductivity, where a metal spoon heats faster than a plastic spoon, a scratch test directly assesses hardness.
1. It is common for people to face divorce, job layoffs, and debt at which of the following stages of life?
a. middle years
b. young adulthood
c. later middle years
d. older years
2. As we proceed on our life course, the events we experience are largerly influenced by
a. our social location and time period in which we were born.
b. our biological makeup
c. the type of groups we associate with when we become adults
d. our early childhood socialization.
The correct choice is (C) later middle years
Explanation:Later middle years is almost 30 to 40 years of a person's life. It is the most critical period of life because every person wants to get a successful life i this stage. We marry in this age and due to certain failures people get divorced too. Some people lose their jobs due to various reasons and many people also suffer from high debts because they want to stabilize themselves by starting a business if they don't get a suitable job.
Answer 2:The correct answer is (C) the type of groups we associate with when we become adults
Explanation:It is better said that a man is known by the company he keeps. So therefore it is a proven fact that all people are mostly influenced by their friends and social circle where they spend most of their time. The life style that we get and the behavior that we show is dependent upon the social circle and family members where we live. Therefore as we move in our lives the events we experience are largely influenced by the type of groups we associate with when we become adults
a ball rolls 6.0 meters as its speed changes from 15 meters per second to 10 meters per second. whaf is the average speed of the ball as it rolls the 10 meters?
The average speed of the ball as it rolls 10 meters is 8.33 meters per second.
Explanation:
The average speed of the ball as it rolls the 10 meters can be found by dividing the total distance traveled by the total time taken. In this case, the ball rolls 6.0 meters while its speed changes from 15 meters per second to 10 meters per second. The time taken to roll this distance can be calculated by using the formula:
Time = Distance / Speed
Substituting the given values:
Time = 6.0 meters / (15 meters per second - 10 meters per second) = 6.0 meters / 5 meters per second = 1.2 seconds
The average speed of the ball is therefore 10 meters / 1.2 seconds = 8.33 meters per second.
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How many moons does planet Neptune have
Neptune is eighth the farthest planet from the Sun. It is about 2.8 billion miles (4.5 billion km) away. Neptune appears to look blue because of the gas in its atmosphere. Neptune has at least 14 known moons. Triton is Neptune's largest moon. Triton has volcano-like eruptions that burst from openings in the surface.
An element like silicon is not usually used to make wires or pans because it _____. is not solid at room temperature can leave behind traces of radioactivity Is not very abundantly found on Earth is not good conductors of electricity or heat
Referring to the above diagram, if the incline on the right has a slope of 5 cm of rise for each 2 cm of run, what distance will the ball travel horizontally on the incline to the right?
options are:
A: 10cm
B: 20cm
C: 8cm
D: no way to tell
A particular molecule has two hydrogen atoms and two oxygen atoms. How do you know that this is not a molecule of water?
a bird flies north with a force of 11N, the air resistance is 2N.show the vectordiagram, with the magnitude and displacement indicated clearly.
This problem involves a bird flying with a force of 11N against an air resistance of 2N. In the vector diagram, the bird's force is represented as an upward arrow of length 11, and the air resistance as a downward arrow of length 2. The net force is 9N, represented by an upward arrow of length 9, which indicates the direction and strength of the bird's motion.
Explanation:In this problem, a bird is flying north with a force of 11N while the air resistance is posing a force of 2N. Given the directions, we should make a vector diagram. A vector is characterized by both magnitude (in this case, the strength of force) and direction. The magnitude is the length of the vector, while the direction shows the way the force is applied.
Let's assume the northward direction is upward. You can represent the bird's motion as an upward arrow of length 11. This represents the 11N force north. The force due to air resistance, being 2N, can be represented as a downward arrow of length 2, indicating it's acting in the opposite direction to the bird's motion.
The net force is the vector sum of these two forces. Since they are in opposite directions, you subtract the smaller from the larger, giving a net force of 9N (11N bird's force - 2N air resistance). This net force can be represented by an upward arrow of length 9, indicating the bird still continues its movement to the north.
The displacement is the distance and direction the bird has moved. This will depend on the time the bird has been flying and is not indicated in the question.
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