Explanation : Tina is doing work all of the time because whiles she’s pulling and allowing the rope to be pulled her body using muscles to keep herself upright and a firm grip on the rope.
Answer:
whenever she pulls the puppy toward her
Explanation:
a spiral spring of natural length 10.0cm has a scale pan hanging freely in its tower ends . When an object of mass of 20g is placed in pan ,its length becomes 21.80cm ,when another object of mass 30g is placed in the pan,the length, becomes 11.05cm.Calculate the mass of the scale pan.
Answer:
Explanation:
There seems to be a typo in the problem statement. It says the spring stretches to a shorter length after more mass is added. Please check the problem statement. I'm going to do the calculations assuming that the first length should be 11.80 cm and the second length should be 12.05 cm.
Hooke's law states that the force needed to compress or extend a linear spring is:
F = kΔx, where k is the stiffness and Δx is the displacement.
When a 20g object is placed in the pan, the spring stretches to a length of 11.80 cm. The force of the spring is counteracting the weight of both the pan and the object. Therefore:
(m + 0.020) g = k (0.1180 - 0.100)
And when another 30g object is placed in the pan, the spring stretches to a length of 12.05 cm.
(m + 0.020 + 0.030) g = k (0.1205 - 0.100)
We now have two equations and two variables. If we divide the second equation by the first equation:
(m + 0.050) / (m + 0.020) = (0.1205 - 0.100) / (0.1180 - 0.100)
(m + 0.050) / (m + 0.020) = 0.02050 / 0.0180
0.0180 (m + 0.050) = 0.02050 (m + 0.020)
0.0180 m + 0.0009 = 0.02050 m + 0.00041
0.00049 = 0.0025 m
m = 0.196
The pan has a mass of 0.196 kg, or 196 g.
Which of the following elements is stable? A. Boron, atomic number 5 B. Fluorine, atomic number 9 C. Carbon, atomic number 6 D. Neon, atomic number 10
Answer: neon atomic 10 hope this helps
Explanation:
Answer:
C.) Neon, atomic number 10
Explanation:
The conditions in a local area include temperature, atmospheric pressure, wind, and humidity. The combination of all these conditions determines
A.
the climate in the area.
B.
the geology in the area.
C.
the time of day in the area.
D.
the weather in the area.
Answer:
A
Explanation:
because the climate of a place takes a long time or years to change
Final answer:
Local conditions like temperature, atmospheric pressure, wind, and humidity determine the weather in an area, which refers to short-term atmospheric conditions.
Explanation:
The combination of local conditions such as temperature, atmospheric pressure, wind, and humidity determines the weather in the area. Together, these are all components of weather, which refers to the atmospheric conditions during a short period of time. In contrast, climate is the statistical summary of these elements over long periods, affecting and defining the characteristics of a region or biome. Hence, the correct answer to the question is: D. the weather in the area.
Help!!! What is the kinetic energy of a 0.1kg baseball thrown at 20m/s? With work please
Kinetic Energy = 1/2 * mass * velocity^2
Mass = 0.1 kg
Velocity = 20 m/s
Kinetic energy = 1/2 * 0.1 * 20^2
Kinetic energy = 1/2 * 0.1 * 400
Kinetic energy = 20 J
what is the difference between a crest and a trough
Answer: The trough is the lowest point of a wave while the crest is the highest point of a wave.
15 POINTS! In the endocrine system, what is the function of a negative feedback loop?
Answer:
Negative feedback is a reaction that causes a decrease in function. It occurs in response to some kind of stimulus. Often it causes the output of a system to be lessened; so, the feedback tends to stabilize the system. This can be referred to as homeostatis.
Explanation:
The negative feedback of an endocrine system decreases the output and tends to maintain the stability of the system.
What is an endocrine system?An internal messenger system that contains feedback loops of hormones released by the internal glands of an organism. These hormones go directly into the circulatory system to regulate distantly target organs.
Negative feedback is a part of the endocrine system. It is a reaction that causes a decrease in function. It occurs in response to some kind of stimulus. Often it causes the output of a system to be lessened; so, the feedback tends to stabilize the system. This can be referred to as homeostasis.
Thus, we can conclude that the negative feedback of an endocrine system decreases the output and tends to maintain the stability of the system.
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Which kind of lenses are used to correct nearsightedness (the ability to see up close but not far away)? Check all that apply
A.) Concave
B.) Converging
C.) Diverging
D.) Convex
Concave and Diverging lens are used to correct nearsightedness.
Answer: Option A & C
Explanation:
There are two main problems in eyesight which are nearsightedness also known as myopia which is the inability to see the objects that are far away and farsightedness where the person suffers the inability to read without correction to eyesight.
In this case, objects which are near can be seen properly whereas distant objects are blurred and so the person need correction in eyesight either by glasses or Concave lens and Diverging lens. It is the best suited option for those cases.
The kind of lenses used to correct nearsightedness is A.) Concave and B.) Converging.
What is nearsightedness?Nearsightedness, also known as myopia, is an eye condition where the light rays from distant objects are focused in front of the retina instead of on the retina. This causes distant objects to appear blurry.
Concave lenses are used to correct nearsightedness because they diverge the light rays, which helps to bring them into focus on the retina. Converging lenses are also used to correct nearsightedness, but they are less common.
Therefore, the correct answers are A.) Concave and B.) Converging.
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Safety precautions taken while determining the melting point of naphthalene using cooling curve
The safety measures include wearing appropriate safety gear, slow and even heating, not leaving the experiment unattended, allowing the test tube to cool gradually after melting, and appropriate disposal.
Explanation:Determining the melting point of naphthalene through a cooling curve requires adherence to numerous safety precautions. The most crucial is to use safety equipment appropriately, such as wearing protective goggles, a lab coat, and gloves. Secondly, you must ensure to heat the naphthalene slowly and evenly to prevent it from catching fire as it's flammable. Keep the surrounding area free from flammable materials. In case of a sudden increase in temperature or boiling, turn off the heat source immediately.
Lastly, never leave the experiment unattended. After the naphthalene has melted, let the test tube cool gradually, and do not immerse it in cold water, as it could shatter from thermal shock. Dispose of the melted naphthalene according to your school's laboratory safety protocols.
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Modern oil tankers weigh over a half-million tons and have lengths of up to one-fourth mile. Such massive ships require a distance of 5.1 km (about 3.2 mi) and a time of 18 min to come to a stop from a top speed of 34 km/h.
(a) What is the magnitude of such a ship's average acceleration in m/s2 in coming to a stop?
(b) What is the magnitude of the ship's average velocity in m/s?
(a) [tex]-1.46\cdot 10^{-4} m/s^2[/tex]
The average acceleration of the ship is given by
[tex]a=\frac{v-u}{t}[/tex]
where
v is the final velocity
u is the initial velocity
t is the time elapsed
Here we have:
[tex]u=34 km/h =9.44 m/s[/tex] is the initial velocity
v = 0 is the final velocity
[tex]t=18 min =64800 s[/tex] is the time elapsed
Substituting, we find
[tex]a=\frac{0-9.44 m/s}{64800 s}=-1.46\cdot 10^{-4} m/s^2[/tex]
(b) 4.72 m/s
Assuming the acceleration is uniform, the average velocity of the ship is given by:
[tex]v_{avg} = \frac{v+u}{2}[/tex]
where
v is the final velocity
u is the initial velocity
Here we have:
v = 0
u = 9.44 m/s
So the average velocity of the ship is
[tex]v_{avg} = \frac{0+9.44 m/s}{2}=4.72 m/s[/tex]
In Physics lab, Ellen has been given the task of constructing a simple motor. She must find common household items at home and bring them to class the following day. Her list of items include:
9 volt battery and leads, copper wire rotor, platform to hold the rotor, a magnet, and a wood base
She sets up her motor in physics lab the next day and finds that it works well. Which statement below explains the flow of energy through Ellen's motor?
A) battery-->electrical current-->copper wire rotor -->magnet--> mechanical energy
B) battery--> magnet--> electrical current--> copper wire rotor--> mechanical energy
C) magnet--> mechanical energy--> copper wire rotor--> battery--> electrical current
D) magnet--> copper wire rotor--> mechanical energy--> battery--> electrical current
Answer:
The answer is A.
Explanation:
The flow of the energy in Ellen's motor can be explained as battery→ electrical current → copper wire rotor → magnet → mechanical energy. Therefore, option A is correct.
What is an electric motor?An electric motor can be described as an electrical machine that transforms electrical energy into mechanical energy. Most electric motors work through the interaction between the magnetic field and electric current in a wire winding to generate force as torque applied on the motor's shaft.
An electric generator can be defined as mechanically identical to an electric motor, but works with a reversed flow of power, transforming mechanical energy into electrical energy.
Electric motors can power by DC sources, such as from batteries, or by alternating current (AC) sources, such as a power grid, or electrical generators.
Electric motors can be classified by considerations such as power source, construction, and type of motion output. They can be powered by AC or DC, single-phase, two-phase, or three-phase, axial or radial flux, and can be air-cooled.
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Confirmation bias can affect our problem-solving abilities.
A. True
B. False
The answer true I’m guessing. It’s a 50/50 chance
What can cause the eruption from a shield volcano to become explosive?
Answer: Shield volcano is a broad, gently sloping, explosive volcano which is comprised of basaltic magma.
Shield volcano is normally not explosive but if somehow water comes in contact with this basaltic magma, then it turns into a more violent, explosive volcanoes, producing pyroclastic materials such as lapilli, lava bombs and block.
An explosive eruption from a shield volcano can be caused by the trapping of gases in highly viscous magma, leading to a buildup of pressure and a violent explosion.
Explanation:
The eruption from a shield volcano can become explosive if there is a sudden release of trapped gases within the magma. This occurs when the magma is highly viscous, preventing the gases from escaping easily, and pressure builds up. Eventually, the pressure becomes too great and results in a violent explosion.
An example of an explosive eruption from a shield volcano is the 1790 eruption of Kilauea in Hawaii. The eruption sent ash, rocks, and gas high into the air, causing widespread damage and creating a large crater.
To summarize, an explosive eruption from a shield volcano can be caused by the trapping of gases in highly viscous magma, leading to a buildup of pressure and a violent explosion.
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EXPLAIN THE DIFFRENCE BETWEEN AN EXPERIMENT AND OTHER TYPES OF SCIENTIFIC INVESTIGATION AND EXPLAIN THE RELATIVE BENEFITS AND LIMITATIONS OF EACH
Answer:
Explain that an investigation is observing or studying the natural world, without interference or manipulation, and an experiment is an investigation that involves variables (independent/manipulated and dependent/ outcome) and establishes cause-and-effect relationships (Schwartz, 2007).
Final answer:
Experiments involve controlled manipulation of variables to test a hypothesis, ideal for establishing causation but possibly limited by artificial settings and ethical concerns. Observational studies, on the other hand, involve natural observation without direct interference, which is beneficial for ethical or practical scenarios but can be less definitive in establishing cause-and-effect relationships.
Explanation:
The difference between an experiment and other types of scientific investigations resides in the controlled manipulation of variables. An experiment is a procedure carried out under controlled conditions to test a hypothesis. It typically involves changing one variable (independent variable) to see the effect on another variable (dependent variable), while controlling all other variables.
Another common type of scientific investigation is observational research, which involves making observations of systems or phenomena as they occur naturally. Unlike experiments, observational studies do not involve direct manipulation of variables by the researcher. Instead, researchers observe and record data without interfering.
The benefits of experiments include the ability to establish cause-and-effect relationships due to the control over variables. Limitations might include ethical concerns and artificial settings which may not reflect real-world conditions. Observational studies are beneficial when experimentation is not ethical or practical, offering more natural insights, but they are limited in their capacity to deduce causality due to potential confounding variables.
Summary of the Benefits and Limitations
Experiments allow for causal inferences and control over variables but may lack real-world applicability and face ethical constraints.Observational studies provide more natural data in real-world settings but cannot reliably establish causation due to the lack of controlled manipulation.what is ur Opinion on Methane
Answer: it is bad for you and can cause some crazy brain dammage and this could potentially end you life because it is harmful :p
What is a central idea
Answer:
The definitive and unifying theme or idea of a story or article. It encompasses all the aspects necessary to create a coherent main idea. The central idea is typically expressed as a universal truth or theme that is built and supported by the setting and characters in a story.
Explanation:
This is the correct answer to your question.
Hope this helps!!!
Kyle.
a mass of 2000 kg is raised 5.0 m in 10 seconds what is the potential energy of the mass at this height?
A. 98,000 J
B. 9,800 J
C. 0 J
Answer:
A. 98,000 J
Explanation:
The gravitational potential energy of an object is given by
U = mgh
where
m is the mass of the object
g is the gravitational acceleration
h is the heigth above the ground
In this problem,
m = 2000 kg
g = 9.8 m/s^2
h = 5.0 m
Substituting into the equation, we find
[tex]U=(2000 kg)(9.8 m/s^2)(5.0 m)=98,000 J[/tex]
Answer:
0 J
Explanation:
the object isn't moving, there is no kinetic energy. This question is worded poorly and made this not obvious.
You use a pulley system to lift a fallen tree . You apply a force of 50 N and the pulley pulls on the tree with a force of 1300 N what is the mechanical advantage of the pulley ?
Mechanical Advantage = (output force) / (input force)
Mechanical Advantage = (1300 N) / (50 N)
Mechanical Advantage = 26
The mechanical advantage of pulley is that with less applied force we can get large amount of work.
To find the answer, we need to know about the pulley system.
What is a pulley system?A pulley system is a wheel on an axle or shaft which is designed to support the movement and change the direction of a taut cable or belt, or transfer the power between the shaft and cable or belt.
What is the basic idea of a pulley system work?In a pulley system, we get a huge amount of force from a less amount of applied force.
Thus, we can conclude that the mechanical advantage of pulley is that with less applied force we can get large amount of work.
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electric current is the flow of charged particles called blank .
The electric current is measured in coulombs per second. A flow of one coulomb per second is called one ampere
The electric current is the flow of electrons which are negatively charged particles.
Explanation:
The flow of electrons in a circuit is called the electric current. It is measured with one coulomb of charge across the circuit in 1 second that is called an ampere. This ampere is the standard unit of electric current.
The flow of electrons across the circuit is achieved by the potential difference across the circuit. This potential difference is the difference of electrical voltage generated across the circuit in order to achieve flow of current.
Which is the correct symbol for an isotope of bromine with 35 protons and 38 neutrons?
Answer:
73/35 Br
Explanation:
The symbol for a bromine isotope with 35 protons and 38 neutrons corresponds to the acronym used to represent bromine, with the atonic number on the left side of this circle in the upper corner and the mass number on the left side of this acronym in the lower corner.
The number is the number of protons, in this case the atomic number is 35. The number of the mass is the sum between the number of protons and the number of neutrons, which in this case is 35 + 38 = 73. The acronym that corresponds to bromine is "Br".
With that, we can conclude that the correct symbol would be 73/35 Br
If you make an electromagnet using a battery circuit and a steel nail how can you increase its magnetic strength?
By wrapping a conductive wire around a steel nail and adding a battery, you've created what is known as a solenoid. This solenoid produces a magnetic field around the nail when a current is passed through it. There is an equation that relates the various properties of the solenoid together to determine the strength of the magnetic field; in short, to increase the strength, you can shorten the overall length of the coiled wire (not the wire itself, but the length of the coil around the nail), increase the current flowing through the wire, or increase the number of turns/loops of wire around the nail.
Hope this helps!
Calculate [H3O+
] of a 0.150 M acetic acid solution.
Answer:
[H3O+] = 0.00520 M
Explanation:
The dissociation of acetic acid in water is given by the equation;
CH3COOH + H2O<-------> H3O+ + CH3COO-
ka = [H+][C2H3O2-]/[HC2H3O2]
Ka = 1.8 x 10^-5
= x^2 / 0.150-x
x = [H3O+]= 0.00520 M
Is there an app to where you can take a picture of the question and get an answer
Answer:
Yes, there are actually a few apps that are capable of such requests.
Explanation:
Picture Math is one of the many out there.
Hope this helps!
Which scenario involves acceleration? a motorcycle at constant speed on a highway a recreational vehicle parked in a campground a car decreasing its speed due to a red light a teenager talking to friends at an intersection
Answer:
a car decreasing its speed due to a red light
Explanation:
Acceleration of an object is defined as the rate of change in velocity of the object:
[tex]a=\frac{\Delta v}{\Delta t}[/tex]
where
[tex]\Delta v[/tex] is the change in velocity
[tex]\Delta t[/tex] is the time elapsed
Therefore, we have a non-zero acceleration every time there is a change in velocity.
Among the examples given, we notice that only the following one:
"a car decreasing its speed due to a red light"
involves a change in velocity (because the car is decreasing its speed), therefore this scenario involves a non-zero acceleration.
A car decreasing its speed due to a red light is accelerating since there is a change in speed.
Acceleration is the rate of change of speed with respect to time. Acceleration is given by:
Acceleration = change in speed / time
A motorcycle moving at constant speed is not accelerating since there is no change in speed.
A recreational vehicle parked in a campground s not accelerating since there is no change in speed.
A car decreasing its speed due to a red light is accelerating since there is a change in speed.
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What is the current in the 10.0 , resistor?
120.0 V
10.00
20.00
30.00
O A. 2.00 A
O B. 12.0 A
O C. 22.0 A
O D. 10.0 A
Answer:
B. 12.0A
Explanation:
The circuit shown in the image is a parallel circuit which mean that the voltage of the source is equal across each resistance in the circuit because they are directly connected to the terminals of the voltage source.
The voltage across the 10 Ohms resistor is 120V
So, let's proceed to calculate the current
By using Ohm's Law
[tex]I=\frac{V}{R} \\I= \frac{120.0V}{10.0Ohm} \\I= 12.0A[/tex]
12A is the amount of current flowing through the 10 ohms resistor.
Current = (voltage) / (resistance)
The ends of the 10-ohm resistor are connected directly to both terminals of the battery.
So the voltage across the resistor is the voltage of the battery ... 120 V. None of that other stuff in the circuit has any effect on it.
Current = (120 V) / (10 ohms)
Current = 12 A . (B)
which of the following types of waves requires a medium: microwave, visible light, sound waves or x-rays
Sound waves my dude
Sound waves and visible light require a medium to travel.
What is a wave?A disturbance or variation in a medium that transports energy from one point to another and can take the form of elastic deformation or a change in pressure, electric or magnetic intensity, electric potential, or temperature.
Sound waves need a medium, such as air, water, or solids, to propagate and be heard. They are caused by the vibration of a material and the transfer of this vibration through the medium.
Visible light also requires a medium to travel, although it can travel through a vacuum, such as space. In a vacuum, light travels at its fastest speed and does not encounter any resistance. In a medium, such as air, glass, or water, light travels more slowly and is refracted or bent.
Microwaves and X-rays do not require a medium to travel. Microwaves are a type of electromagnetic radiation that can travel through a vacuum, such as the space between the Earth and a satellite, as well as through solids, liquids, and gases. X-rays are also a type of electromagnetic radiation that can travel through a vacuum and penetrate materials that are opaque to visible light.
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How does jumping into a pool change the amount of gravity acting on you?
Answer:
Because of the buoyant force
Explanation:
Jumping into a pool change the amount of apparent gravity acting on a person.
Normally, for a person in free fall, the weight of the person is given by:
[tex]F=mg[/tex]
where m is the mass of the person and g=9.8 m/s^ is the acceleration due to gravity.
When a person is in the water, there is a buoyant force pushing the person upward. The magnitude of the buoyant force is
[tex]B=\rho_w V g[/tex]
where
[tex]\rho_w[/tex] is the density of the water
V is the volume of displaced fluid
g is the acceleration due to gravity
So the net force acting on the person is
[tex]F= mg - \rho_w V g[/tex] (1)
Since V corresponds to the volume of the person, we can rewrite it as
[tex]V=\frac{m}{\rho_p}[/tex]
where [tex]\rho_p[/tex] is the density of the person. Substituting into eq.(1),
[tex]F=mg- m \frac{\rho_w}{\rho_p} g = mg - mg'[/tex] (2)
where we called
[tex]g'=\frac{\rho_w}{\rho_p} g[/tex]
So we can further rewrite (2) as
[tex]F=m(g-g')[/tex]
so we see that the gravity acting on the person, g, has been modified into (g-g') due to the presence of the buoyant force.
The ransom note in the Lindbergh kidnapping case included some obvious spelling errors and other foreign and regional language. What linguistic methods were used to help identify the kidnapper?
In the Lindbergh kidnapping case, linguistic methods like analyzing spelling errors and language patterns in the ransom note were critical to identifying the kidnapper, showcasing the interplay between language and forensic science.
Explanation:The Lindbergh kidnapping case involved linguistic analysis to help identify the kidnapper, highlighting the significance of language in forensic investigations. Linguists and experts analyzed the ransom note for spelling errors and peculiar language use, which can reveal regional or foreign linguistic traits, potentially pinpointing the origins or characteristics of the writer. These investigative techniques, examining the language patterns and grammatical nuances, provided clues to the kidnapper's identity similar to how Broca suggested Leborgne's limited speech was linked to the tanneries of his hometown in Moret-sur-Loing, reflecting how personal history and environment impact language use. The case is an example of how awareness of linguistic details can be a powerful tool in criminal investigations, demonstrating the depth at which language intertwines with cultural identity and personal history.
A circuit that has only a single path for current to flow through is best classified into which category?
Answer:
A series circuit
Explanation:
A circuit that has only a single path for current to flow through is best classified into which category?
a series circuit
an open circuit
a parallel circuit
a short circuit
Explanation:
The reason that A ( a series circuit ) is the answer is because in a series circuit, it only allows for current to flow in one single path.
Answer: A series circuit
Explanation: A circuit that has only a single path for current to flow through is best classified into which category?
What type of circuit is illustrated?
A) an open parallel circuit
B) a closed parallel circuit
C) an open series circuit
D) a closed series circuit
Answer: c) an open series circuit
Explanation:
this is because the key is open
What is the porpose if a capacitor in a Mobil phone?
A. It maintains proper voltage levels in the circuits.
B. It contains many solid-State components, which serve a variety of functions.
C. It amplifies the phone’s incoming signal.
D. It allows a mobile phone to store data.
Answer:
It allows a mobile phone to store data
Answer:
store data
Explanation: