5. A 60kg woman walks up a flight of stairs that connects 2 floors 3.0m floor apart. By how much does the woman's potential energy change?
Answers
Answer:
3531 joules of Potential energy
Explanation:
2 floors 3.0m floor apart means that she climbed 6 total meters upwards, if that is the case then you use
U=mgh where U is potential energy, m is mass, g is gravity(9.81 m/s^2 on earth, you can assume it's this basically every time) and h is 6 meters. If she climbed some other height just replace the h with it instead of 6.
Related Questions
Which musical instruments produce lower pitches
Answers
Answer:
bigger instruments make lower pitches
Explanation:
bass drums and other large instruments have low sounds because they're so big. the smaller the instrument is, the higher pitch it's going to have
Answer:
It is mostly the Bass instruments because they use mouthpieces while the wind instrument use reeds and make a higher pitched sounds
Explanation:
Band
When a fan is switched on, it achieves an angular acceleration of 250 rad/s2. after 1.2 s, what is the angular velocity in revolutions per minute?
Answers
When a fan is switched on, it achieves an angular acceleration of 250 rad/s2. after 1.2 s, the angular velocity in revolutions per minute would be 1989 rev/minute.
What is Velocity?The total displacement covered by any object per unit of time is known as velocity. The velocity of an object depends on the magnitude as well as the direction of the object.
velocity = total displacement /time
As given in the problem When a fan is switched on, it achieves an angular acceleration of 250 rad/s2. after 1.2 s,
By using the equation of motion for the rotational motion,
α = ω₀ + ωt
250 = 1.2 ω
ω = 250/1.2
= 208.33 rad/s
2π radian = 1 revolution
1 radian = 1/2π revolution
208.33 rad = 208.33 /2π revolution
=33.15 revolution
The number of revolutions in one minute = 33.15 ×60
=1989
Thus, the angular velocity comes out to be 1989 rev/minute.
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a substance that has high reactivity
Answers
Answer:
The most reactive element is fluorine, the first element in the halogen group. The most reactive metal is francium, the last alkali metal (and most expensive element)
Explanation:
Follow instagrm at --> mvnnyvibesIt is always necessary to use more precise instruments when redoing an experiment to get better results.
True
False
Answers
The statement "It is always necessary to use more precise instruments when redoing an experiment to get better results" is false. While using more precise instruments can often lead to improved accuracy and reliability in scientific experiments, it is not always necessary or the sole factor that determines better results. Several other factors contribute to the quality of experimental outcomes, and the use of more precise instruments is just one aspect.
Precision in instruments refers to the level of detail and accuracy with which measurements can be made. It allows for smaller increments of measurement and reduces the potential for errors. When redoing an experiment, using more precise instruments can help reduce measurement errors and increase the level of detail captured. This can be particularly important in experiments that require precise measurements, such as those involving small quantities or sensitive reactions.
However, there are situations where the precision of instruments may not be the primary concern or where it may not significantly impact the results. For example, in experiments where the variables being measured have a large magnitude or natural variability, the use of extremely precise instruments may not yield significantly different results compared to instruments with slightly lower precision. In such cases, other factors like experimental design, sample size, controls, and methodology may have a more significant impact on the quality of results.
Furthermore, there may be instances where the cost, availability, or practicality of using more precise instruments outweighs the potential benefits. Precise instruments are often more expensive, require specialized training for operation, and may have limited availability in certain settings. In such cases, researchers may need to make trade-offs between precision and other factors like cost, feasibility, or time constraints.
In conclusion, while using more precise instruments can generally improve the quality of experimental results, it is not always necessary or the sole determinant of better outcomes. Factors such as experimental design, sample size, controls, methodology, and the nature of variables being measured also play significant roles in obtaining accurate and reliable results. Scientists need to consider the specific requirements and constraints of their experiments and make informed decisions about instrument precision based on a comprehensive evaluation of these factors.
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When the liquid line is restricted, the supply of refrigerant to the metering device is reduced. What is the effect on suction pressure and superheat
Answers
Answer:
The suction pressure decreases and the superheat increases when the liquid line is restricted and the supply of refrigerant to the metering device is reduced.
Explanation:
1. The five components of refrigeration are:
Fluid refrigerantCompressorCondenser coilEvaporator coilExpansion device.The compressor limits the vapor released by the refrigerant. This
causes a rise in pressure (in refrigerant), which then pushes the
vapor into the coils on the outside of the refrigerator.
2. Now when the cooler air meets the warm gas present in the coils, it
gets converted into liquid form.
3. Thus, when the liquid form is at high pressure, the refrigerant then
cools down as it flows through the coils placed in the fridge ( in both
freezing and normal sections).
4. The refrigerant also absorbs the warm air present in the fridge, which
causes it to evaporate and flow back through the compressor and the
cycle repeats in the same form.
Thus, when the liquid line is restricted and the supply of refrigerant to the metering device is reduced it causes a decrease in suction pressure and an increase in superheat.
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LeBron James runs 260 meters East, then realized he dropped is basketball. He turns around and walks 54 meters West until he finds his ball. It takes him 45 seconds for the full trip. How far away is he from where he started?
Answers
Answer:
206 meters East
Explanation:
Assuming that the starting point of Lebron James 0. He ran from point 0 to 260 meters in the Eastern direction. His displacement is now 260 meters to the East.
He then turned from the Eastern to the Western direction - opposing directions - and then walked 54 meters to find his ball. His displacement from the starting point will now be:
260 - 54 = 206 meters in the Eastern direction.
Three resistors of 100 W, 3900 W, and 1000 W are connected in series across a 200-V battery. What is the voltage drop across the resistor of value 1000 W?
Answers
Answer:
40 V
Explanation:
I will assume that the resistors are
100 and 3900 and 1000 OHMS <=====(NOT W)
In series , the resistances add together 100 + 3900 + 1000 = 5000 ohms total
V = IR
I = V / R so the total current will be 200 v / 5000 ohms = .04 amps
this is the current through all of the resistors
so for the 1000 ohm resistor V = IR .04 (1000) = 40 V
The phenomenon of pressure waves emanating from the bullet, causing damage remote from its path, is known as: A. capitation. B. cavitation. C. congruent.
Answers
The phenomenon of pressure waves emanating from the bullet, causing damage remote from its path, is known as B. cavitation.
Cavitation occurs when a bullet passes through a medium, like air or water, at high velocity, causing the medium to compress and expand rapidly. The rapid compression and expansion create a series of shock waves that can cause damage beyond the path of the bullet itself. Cavitation can cause damage to objects as well as tissue and organs, as the shock waves cause significant disruption. The effects of cavitation can be seen in other forms of high-velocity projectiles, such as missiles. Cavitation can also be used in underwater applications to create shock waves that can be used to clear debris or even kill marine life.
In summary, cavitation is the phenomenon of pressure waves emanating from a bullet, causing damage remote from its path. This phenomenon can cause considerable damage beyond the path of the bullet, as well as having practical applications in underwater engineering. Therefore the correct option is B
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A long distance runner running a 5km track is pacing himself by running 4.5km/h at 9km/h and the rest at 12.5km/h9
Answers
Complete Question:
A long distance runner running a 5.0km track is pacing himself by running 4.5km at 9.0km/hr and the rest at 12.5km/hr. What is the average speed?
Answer:
Average speed = 9.7333 km/h
Explanation:
Let the total distance be divided into A and B.Given the following data;
Total distance = 5 kmDistance A = 4.5 kmSpeed A = 9.5 km/hrSpeed B = 12.5 km/hrTo find the average speed;
First of all, we would determine the time taken to cover distance A in speed A by using the formula;
\( Time \ A = \frac {Distance \; A}{Speed \; A} \)
Substituting the values into the formula, we have;
\( Time \ A = \frac {4.5}{9.5} \)
Time A = 0.4737 hours
Total distance = distance A + distance B
5 = 4.5 + distance B
Distance B = 5 - 4.5
Distance B = 0.5 Km
Next, we would determine the time to cover distance B in speed B;
\( Time \ B = \frac {0.5}{12.5} \)
Time A = 0.04 hours
Total time = time A + time B
Total time = 0.4737 + 0.04
Total time = 0.5137 hours
Now, we would solve for the average speed;
Mathematically, the average speed of an object is given by the formula;
\( Average \; speed = \frac {total \; distance}{total \; time} \)
\( Average \; speed = \frac {5}{0.5137} \)
Average speed = 9.7333 km/h
How can you make two objects with different masses move the same distance
Answers
Answer:
apply more energy to the object with more mass
Explanation:
PLZ HELP DUE IN 10MIN!!!!!!!!!The temperature of the water vapor (H2O) inside a pressure cooker increased from 295 K to 395 K. As
the sample is heated, the pressure of the water vapor went from 21.0 kPa to _____.
Answers
Answer:
p2=28.12KPa
Explanation:
Given data:
Initial temperature = 295 K
Final temperature= 395 K
Initial pressure = 21.0 KPa
Final pressure = ?
Solution:
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
21.0 KPa / 295 K = P₂/395 K
P₂ = 21.0 KPa× 395 K / 295 K
P₂ = 8295 KPa. K /295 K
P₂ = 28.12 KPa
Which describes the movement of a fluid during convection?
Warm and cool fluids rise.
Warm and cool fluids sink.
Warm fluid rises and cool fluid sinks.
Warm fluid sinks and cool fluid rises.
Answers
Answer:
warm rises cold sinks
Explanation:
solid. 7. A gold smith claims that an ornament is made of pure gold of density 19.32 g/cm³. A chain made from this gold weighs 25.25 g. The apparent weight of the chain when immersed in water is 23.075 g. Using a suitable calculation, determine the purity of gold.
Answers
Answer:
Wc - Ws = 25.25 - 23.075 = 2.175 weight of water displaced
Since water has a density of 1 means the chain has a volume of 2.175 cm^3
The density of the chain is M / V = 25.25 g / 2.175 cm^3
ρc = 11.6 which is less than pure gold of 19.32
This is all that one can say about the purity of gold in the chain because one does not know the density of other material in the chain.
That means that one does not know how much pure gold is actually in the chain without knowing the density of the rest of the chain.
The purity of gold in the ornament is approximately 99.95% which is determined by the Archimedes principle.
The apparent weight of the chain in water is less than its actual weight due to the buoyant force acting on it.
The volume of the chain.
Density of gold = 19.32 g/cm³
Weight of the chain = 25.25 g
Volume of the chain = W ÷ d
Volume of the chain = 25.25 ÷ 19.32
Volume of the chain = 1.307 cm³
The volume of water displaced.
The apparent weight of the chain in water = 23.075 g
Volume of water displaced = 25.25 - 23.075
Volume of water displaced = 2.175 g
The density of the chain is:
Density of the chain = 25.25 ÷ 1.307
Density of the chain = 19.33 g/cm³
The purity of gold.
Purity of gold = (19.32 ÷ 19.33 ) × 100
Purity of gold = 99.95%
Therefore, The purity of gold in the ornament is approximately 99.95%.
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When is a circuit considered a
"closed circuit"?
A. When the circuit is "on".
B. When the circuit is "off".
C. When the circuit is incomplete.
D. When a circuit's switch is open.
Answers
Answer:
It would be considered a close circuit when the circuit is off
What is the index of refraction of a refractive medium if the angle of incidence in air is 30 degrees and the angle of refraction is 20 degrees?
Answers
The index of refraction of a medium is a ratio of the speed of light in a vacuum to the speed of light in that medium.
It is denoted by the symbol "n". The relationship between the angles of incidence and refraction and the index of refraction of a medium is given by Snell's law, which states that:n1 sinθ1 = n2 sinθ2where n1 and n2 are the indices of refraction of the two media, and θ1 and θ2 are the angles of incidence and refraction, respectively.In this case, the incident medium is air, which has an index of refraction of approximately 1.00. The angle of incidence is 30 degrees, and the angle of refraction is 20 degrees. Therefore, we can use Snell's law to solve for the index of refraction of the refractive medium
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yes that.
Read the excerpt below and then answer the question that follows:
The Book of Dragons
Chapter III The Deliverers of Their Country, an excerpt
By E. Nesbit
It all began with Effie's getting something in her eye. It hurt very much indeed, and it felt something like a red-hot spark—only it seemed to have legs as well, and wings like a fly. Effie rubbed and cried—not real crying, but the kind your eye does all by itself without your being miserable inside your mind—and then she went to her father to have the thing in her eye taken out. Effie's father was a doctor, so of course he knew how to take things out of eyes.
When he had gotten the thing out, he said: "This is very curious." Effie had often got things in her eye before, and her father had always seemed to think it was natural—rather tiresome and naughty perhaps, but still natural. He had never before thought it curious.
Effie stood holding her handkerchief to her eye, and said: "I don't believe it's out." People always say this when they have had something in their eyes.
"Oh, yes—it's out," said the doctor. "Here it is, on the brush. This is very interesting."
Effie had never heard her father say that about anything that she had any share in. She said: "What?"
The doctor carried the brush very carefully across the room, and held the point of it under his microscope—then he twisted the brass screws of the microscope, and looked through the top with one eye.
"Dear me," he said. "Dear, dear me! Four well-developed limbs; a long caudal appendage; five toes, unequal in lengths, almost like one of the Lacertidae, yet there are traces of wings." The creature under his eye wriggled a little in the castor oil, and he went on: "Yes; a bat-like wing. A new specimen, undoubtedly. Effie, run round to the professor and ask him to be kind enough to step in for a few minutes."
"You might give me sixpence, Daddy," said Effie, "because I did bring you the new specimen. I took great care of it inside my eye, and my eye does hurt."
The doctor was so pleased with the new specimen that he gave Effie a shilling, and presently the professor stepped round. He stayed to lunch, and he and the doctor quarreled very happily all the afternoon about the name and the family of the thing that had come out of Effie's eye.
But at teatime another thing happened. Effie's brother Harry fished something out of his tea, which he thought at first was an earwig. He was just getting ready to drop it on the floor, and end its life in the usual way, when it shook itself in the spoon—spread two wet wings, and flopped onto the tablecloth. There it sat, stroking itself with its feet and stretching its wings, and Harry said: "Why, it's a tiny newt!"
The professor leaned forward before the doctor could say a word. "I'll give you half a crown for it, Harry, my lad," he said, speaking very fast; and then he picked it up carefully on his handkerchief.
"It is a new specimen," he said, "and finer than yours, Doctor."
It was a tiny lizard, about half an inch long—with scales and wings.
So now the doctor and the professor each had a specimen, and they were both very pleased. But before long these specimens began to seem less valuable. For the next morning, when the knife-boy was cleaning the doctor's boots, he suddenly dropped the brushes and the boot and the blacking, and screamed out that he was burnt.
And from inside the boot came crawling a lizard as big as a kitten, with large, shiny wings.
"Why," said Effie, "I know what it is. It is a dragon like the one St. George killed."
And Effie was right. That afternoon Towser was bitten in the garden by a dragon about the size of a rabbit, which he had tried to chase, and the next morning all the papers were full of the wonderful "winged lizards" that were appearing all over the country. The papers would not call them dragons, because, of course, no one believes in dragons nowadays—and at any rate the papers were not going to be so silly as to believe in fairy stories. At first there were only a few, but in a week or two the country was simply running alive with dragons of all sizes, and in the air you could sometimes see them as thick as a swarm of bees. They all looked alike except as to size. They were green with scales, and they had four legs and a long tail and great wings like bats' wings, only the wings were a pale, half-transparent yellow, like the gear-boxes on bicycles.
Based on the rising action in the bolded paragraphs, what do we know about Daddy? (5 points)
He is calm and curious.
He is angry and upset.
He is hysterical.
He is uninterested and bored.
Answers
believe in fairy stories. At first there were only a few, but in a week or two the country was simply running alive with dragons of all sizes, and in the air you could sometimes see them as thick as a swarm of bees. They all looked alike except as to size. They were green with scales, and they had four legs and a long tail.
Explanation:
YOUR WELCOME :)
Answer:
its "calm and curious"
Explanation:
hope tis helps!!!
For each method - sometimes used a s heuristic, what is the distance from start to end? (ignore any coloring in the boxes)
Answers
Manhattan distance is a popular heuristic function for sliding-tile puzzles. It is calculated by tallying the number of moves along the grid that each tile takes to move away from its intended position.
What is the Manhattan distance heuristic?Manhattan distance is a popular heuristic function for sliding-tile puzzles. It is calculated by tallying the number of moves along the grid that each tile takes to move away from its intended position. The obvious option for a heuristic function is the Euclidean (straight-line) distance, which, as far as we are aware, can never underestimate the distance but might do so if there is a target obstacle to avoid on the way there.
Any problem-solving strategy that employs a practical approach or numerous short cuts in order to provide answers that might not be ideal but are adequate given a constrained timeline or deadline is known as a heuristic, or heuristic technique.
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A block of mass M is sliding with an initial speed vi along a horizontal surface with negligible friction. A constant force of magnitude FA is exerted on the object at an upward angle of 60∘ from the horizontal, causing the object to speed up. If the block remains in contact with the floor, what is the change in the block's kinetic energy as it moves a horizontal distance Δx ?
Answers
the change in the block's kinetic energy as it moves a horizontal displacement is 1/2fd
Calculation :
Given data:
Mass of the block is: M
Initial speed of the block is: v
Force exerted on the object is: F
angle at which the force is exerted on the block is:
θ=60∘
Horizontal displacement is: d
Determine the work done on the block.
W=Fdcosθ
=Fdcos60∘
=1/2Fd
Consider the work-energy theorem to determine the change in kinetic energy of the block.
ΔK.E=W=1/2Fd
Thus, the change in kinetic energy of the block is 1/2Fd
Kinetic energy is the kinetic energy observable as the motion of a body or subatomic particle. All moving objects and particles have kinetic energy. A walking person, a high-flying baseball, crumbs falling from a table, and charged particles in an electric field are examples of how kinetic energy works.
Kinetic energy is the form of energy that a body or particle has due to its motion. When work is done on an object by applying a net force that transfers energy, the object accelerates, thereby gaining kinetic energy.
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Use the picture to answer the question below-
Which change in wave properties would show as an increase in amplitude?
H E L P P P P
Answers
Select the correct answer.
What does AC stand for in physics?
O A. alternating current
OB. alternative circuit
OC. alternating composition
OD. all charge
Answers
A baseball going 33.0 m/s will take what time in seconds to travel 8.1 meters?
Round your answer to 3 decimal places.
2
Type your answer..
Answers
\(\\ \bull\sf\dashrightarrow Speed=\dfrac{Distance}{Time}\)
\(\\ \bull\sf\dashrightarrow Time=\dfrac{Distance}{Speed}\)
\(\\ \bull\sf\dashrightarrow Time=\dfrac{33}{8.1}\)
\(\\ \bull\sf\dashrightarrow Time=4.07s\)
PLEASE HELP, i really need the help because i dont understand
Answers
The y-component of the vector is 4.97 m.
What is a vector?A vector is a quantity that has both magnitude and direction.
To calculate the y-component of the vector in the diagram above, we use the formula below.
Formula:
Y = Hcos∅.......... Equation 1From the question,
Given:
H = 22.3 m∅ = 77.1°Substitute these values into equation 1
Y = 22.3(cos77.1)Y = 22.3×0.223Y = 4.97 m.Hence, the y-component of the vector is 4.97 m.
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HELP PLEASE!!! 20 POINTS!!
In the formulas for latent heat of fusion and latent heat of vaporization, what does Q represent?
the amount of heat released or absorbed by a substance
the mass of a substance
the amount of a substance that changes state
the temperature of a substance
Answers
Answer:
The amount of heat absorbed or released by a substance.
\(Q = ml _{v} \\ or \\Q = ml _{f}\)
Answer:
The amount of heat released or absorbed by a substance.
Explanation:
which nuclear decay emission consists of energy only?
Answers
Answer:
Gamma radiation
Explanation:
Gamma radiation is a decay emission of pure energy.
Milk of magnesia is a slippery, bitter-tasting white substance that is commonly used as a laxative. If the pH of milk of magnesia is between 10 and 11, it can best be described as a
Answers
Answer:
a moderate base
Explanation:
Milk of magnesia is popularly known as magnesium hydroxide. Magnesium hydroxide Mg(OH)₂ is used as an anti-acid in toothpaste and medically as a mild laxative.
Its pH values range between 10- 11 on the pH scale.
A solution with pH value of 7 is neutral(i.e. neither acidic nor basic.
A pH value which is less than 7 is acidic while a pH value greater than 7 is basic.
For a pH value between 12 -14 on the pH scale is said to be a strong base.
Since Milk of magnesia Mg(OH)₂ pH values ranges between 10- 11 on the pH scale, it is known to be moderately basic.
Two forces act on a 24 kg mass to give it an acceleration of 28 m/s in the positive x direction. If one of the forces acts in the negative y direction with a magnitude of 260 N, what is the magnitude of the second force?
Answers
The magnitude of the second force acting on the 24 kg mass in the positive x direction is 611 N.
To solve this problem, we need to use Newton's Second Law of Motion, which states that the net force acting on an object is equal to the product of its mass and acceleration. We are given the mass of the object (24 kg) and its acceleration (28 m/s in the positive x direction), and we need to determine the magnitude of the second force acting on it.
Let F₁ be the magnitude of the force acting in the negative y direction and F₂ be the magnitude of the second force acting on the object in the positive x direction. The net force acting on the object can be represented as the vector sum of these two forces:
F = √(F₁² + F₂²)
We know that F = m * a, where m is the mass of the object and a is its acceleration.
Substituting the given values, we get:
F = 24 kg * 28 m/s = 672 N
Squaring both sides and substituting F, we get:
F₁² + F₂² = (672 N)²
Substituting the value of F₁ (260 N) and solving for F₂, we get:
F₂ = √((672 N)² - (260 N)²) = 611 N
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a given convex lens has a focal length that varies slightly with the wavelength of the light passing through it. when the a lens is used as the objective of a telescope, this results in
Answers
A given convex lens has a focal length that varies slightly with the wavelength of the light passing through it. when the a lens is used as the objective of a telescope, this results in chromatic aberration.
Chromatic aberration is a phenomenon in which light rays passing through a focus of lens at different points, depending on their wavelength. It is a failure of a lens to focus all colors to the same point. It is also called chromatic distortion and spherochromatism. The focal length of the lens varies directly with the wavelength of the light so focal length increases with wavelength but decreases with refractive index as wavelength is inversely related to it. This is the principal cause of chromatic aberration phenomena.
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Which best describes an example of an n-type semiconductor?
it uses phosphorus so that electrical conduction is due to the movement of electrons.
it uses phosphorus so that electrical conduction is due to the movement of a positive charge.
it uses gallium so that electrical conduction is due to the movement of electrons.
oit uses gallium so that electrical conduction is due to the movement of a positive charge.
Answers
Option A. N-type semiconductor uses phosphorus so that electrical conduction is due to the movement of electrons.
What is n-type of semiconductor?An N-type semiconductor is an impurity mixed semiconductor material used in electronics.
The N-type semiconductor uses pentavalent impure atoms like phosphorus and arsenic.
The conduction through an N-type semiconductor is majorly caused by the electrons.
Thus, n-type semiconductor uses phosphorus so that electrical conduction is due to the movement of electrons.
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someone please help
Answers
\(w = F * S\)
\(F = 20\\S = 10\\F * S = 20 * 10 = 200\) Joules <- 1st answer
\(w = F * S\)
\(1234 = F * 100\)
\(F = \frac{1234}{100}\)
\(F = 12.34 N\) <- 2nd answer
A car traveling 60 miles west (-) stops and then travels another 20 miles
west (-). The car then loops around and travels back to the east (+) a total
of 10 miles. What is the displacement of the car?*
Answers
Answer:
128
Explanation:
One clomiter is 1.06 multipled by 80