name three substances that could be added to the water to make the steel needle to sink
Answers
Answer:
The steel needle floats on top of the water because of surface tension. Surface tension happens because the water molecules at the surface of the water are strongly attracted to each other more than they are to the air molecules above them. The water molecules make an invisible skin on the water’s surface that allows things like the needle to float on top of the water.
When soap is added to the water, the water molecules aren't drawn together as strongly. The soap molecules combine with the water molecules and lessen the liquid’s surface tension. The new attractions between the air, water, and soap molecules are weaker than the water-to-water attractions. As a result, the liquid’s surface is no longer strong enough to support the weight of the steel needle and the steel needle sinks.
Answer:
when a Steel Blade is placed on water horizontally just surface tension and the buoyancy will be able to balance the weight of the blade and it will float on the water surface you know the boy and she is not sufficient to make the Steel Blade float now if you are detergent what are the surface tension of water immediately decreases the surface tension no longer be able to balance The Blade and it will sink
hope it helps u
plz mark it as brainlist
Related Questions
The electric potential in a region of space is V=250V⋅mx2+y2√, where x and y are in meters.
What is the strength of the electric field at (x,y)=(2.6m,1.7m)?
Answers
Electric field strength at (2.6m,1.7m) is 25.9 V/m
Therefore, the term E can be used to determine the electric field intensity at a place whose coordinates are (x,y) (x,y)
V=250 (V⋅m) /√(x²+y²),
E = ∂V/∂x i + ∂V/∂y j
If I is a vector along the x axis, and j is a vector along the y axis, both of which are unit vectors because their magnitudes are one.
∂V/∂x = -250x
(x²+y²)³²
= (-250*2.6)/29.97
=> -21.68
∂V/∂x = -250y
(x²+y²)³²
= (-250*1.7)/29.97
=> -14.18
so E(2.1,3) = -21.68 i -14.18 j
E=√(∂V/∂x i² + ∂V/∂y j²)
E= √(-21.68² + -14.18²)
E=√ (470+201)= 25.9
therefore, the electric field's strength at (2.6m,1.7m) =25.9 V/m
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An expirement is designed to determine the viscosity of honey flow at diffrent temperatures what is the control group for the expirement honey at 75 honey at room temperature honey at 20 honey at 50
Answers
The control group for the experiment is honey at room temperature.
In an experiment, the control group serves as a baseline or reference point against which the experimental groups are compared. In this case, the control group is honey at room temperature. It is the group in which no specific manipulation or alteration is applied to the variable of interest, which in this case is the temperature. By keeping one group at room temperature, the researchers can observe and compare the viscosity of honey at different temperatures to determine the effect of temperature on the flow of honey. The other experimental groups, such as honey at 75, honey at 20, and honey at 50, will be subjected to different temperature conditions to examine the variations in viscosity.
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Gas Laws
By Jessika Crowe
MU
A balloon is filled with 1.5 L of air at 20 °C then placed in
a freezer until it reaches a temperature of 5 °C. What is
the final volume?
What is
0 1.4L
0.72
158
De
Answers
Answer:
1.4L
Explanation:
You basically divide 20 divided by 1.5
1. Reflection Question: What are some actions or activities that can affect your heart rate and respiratory rate and cause either or both of them to increase or decrease?
Answers
Answer:
There are following two activities which affect heart rate and respiratory rate.
1-Exercise
2-Hiking
Explanation:
when we are exercising or hiking our heart rate and respiratory rate affected. This is because during hiking and exercising our body may need three or four time your normal cardiac output. This is because our body consuming energy during the workout and our muscles needs more oxygen. To meet the need of energy and oxygen respiration rate become fast and heart rate also increase.
1. What kind of spectrum (continuous, bright line or dark line) would you expect to see (in visivble light) from each of the following objects? Explain how you reached each conclusion. a. a steel girder, still glowing as it is removed from its mold b. sunlight shining through our atmosphere (as seen from Earth's surface) c. the Orion Nebula (a hot, glowing cloud of thin gases)
2. The planets in our solar system show regularities and trends that suggest they formed in a rotating disk of gases and dust grains called solar nebula. Describe three of these regularities/trends and their significance in the solar nebula concept.
Answers
1. a. A steel girder, still glowing as it is removed from its mold, would produce a **bright line spectrum**. This is because the intense heat causes the atoms in the steel to emit light at specific wavelengths. The high temperature excites the electrons in the atoms, and as they return to lower energy levels, they emit photons of specific energies, resulting in distinct bright lines in the spectrum.
b. Sunlight shining through our atmosphere (as seen from Earth's surface) would produce a **continuous spectrum**. The sunlight consists of a broad range of wavelengths, covering the entire visible spectrum. As it passes through Earth's atmosphere, which contains various gases, particles, and molecules, these components do not selectively absorb or emit specific wavelengths, resulting in a continuous distribution of colors in the spectrum.
c. The Orion Nebula, a hot, glowing cloud of thin gases, would exhibit an **emission line spectrum**. The gases in the nebula are energized by nearby stars, causing them to emit light at specific wavelengths characteristic of the elements present. The excited electrons in the gas atoms emit photons at discrete energies, creating bright lines in the spectrum corresponding to specific elements or molecular transitions.
2. Three regularities/trends observed in the planets of our solar system that support the solar nebula concept are:
a. **Orbital Plane Alignment**: Most planets orbit the Sun in a nearly flat plane known as the ecliptic. This alignment suggests that the planets formed from a rotating disk of gas and dust, as the rotation of the solar nebula would have caused material to flatten into a disk-shaped structure.
b. **Terrestrial and Jovian Planet Differences**: There is a clear distinction between the inner terrestrial planets (Mercury, Venus, Earth, and Mars) and the outer gas giant planets (Jupiter, Saturn, Uranus, and Neptune). The terrestrial planets are smaller, denser, and composed mainly of rocky material, while the gas giants are larger, less dense, and composed mostly of hydrogen and helium. This supports the idea that the solar nebula had different zones with varying compositions and temperatures, leading to the formation of different types of planets.
c. **Rocky Debris in Inner Solar System**: In the inner solar system, there are numerous rocky asteroids and comets, which are remnants from the early stages of planet formation. These bodies are predominantly found in the asteroid belt between Mars and Jupiter and the Kuiper Belt beyond Neptune. Their presence suggests that rocky material was abundant closer to the Sun, while the outer regions contained more gas and icy material.
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Two bricks are released simultaneously from the same height above the surface of the Earth. Brick #1 is simply dropped, while Brick #2 is given a purely horizontal initial velocity of magnitude 10 m/s. If they both strike the ground in 3 seconds, how far from Brick #1 will Brick #2 land? (Ignore air resistance.)
Answers
The distance away in which brick 2 will land from brick 1, given that it was given an horizontal velocity of 10 m/s is 30 m
How do i determine the distance away in which brick 2 will land?The following data were obtained from the question:
Horizontal velocity of brick 2 (u) = 10 m/sTime to reach the ground (t) = 3 secondsHorizontal distance of brick 2 from brick 1 (s) =?The horizontal distance of brick 2 from brick 1 can be obtained as illustrated below:
s = ut
Inputting the given parameters, we have:
= 10 × 3
= 30 m
Thus, we can conclude that the distance in which brick 2 will land frm brick 1 is 30 m
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STATE THE NUMBER OF IMAGES FORMED WHEN AN OBJECT IS BETWEEN TWO PLANE MIRRORS PLACED
Answers
When an object is placed between two parallel plane mirrors, an infinite number of images are formed. This is because each mirror reflects multiple images of the object, and those images are reflected by the other mirror, resulting in a never-ending series of reflections.
However, the intensity of each image decreases as the number of reflections increases, and the images get closer and closer together. In practical applications, only a few images are usually visible due to the limited amount of light available and the decreasing intensity of the images. Plane mirrors are flat mirrors that reflect light in a predictable manner. They are commonly used in many different applications, such as in mirrors for personal grooming or as reflective surfaces in optical instruments.
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Deena made a chart to summarize features of a velocity vs. Time graph for objects with constant acceleration and objects with constant velocity. A 2-column table with 2 rows. The first column is labeled constant acceleration with entries the line is diagonal and straight, find displacement by subtracting the area of the triangle from the area of the rectangle under the line, find acceleration by finding the slope of the line. Second column is labeled constant velocity with entries the line is horizontal, find displacement using the area of the rectangle under the line only, find velocity by locating the values plotted on the y-axis. Which best describes Deena’s error? The line for constant velocity is not horizontal; it is diagonal and slopes downward. The area of the rectangle and the triangle under the line should be added together for constant acceleration Find acceleration by finding the area of the rectangle above the line. Find velocity by calculating the slope of the line.
Answers
The best description of Deena's error is: A "The line for constant velocity is not horizontal; it is diagonal and slopes downward."
How to explain the informationIn Deena's chart, she correctly identifies that the line for constant acceleration is diagonal and straight. This means that the velocity of an object with constant acceleration changes at a constant rate over time.
She also correctly mentions that to find the displacement for this scenario, you need to subtract the area of the triangle (which represents the changing velocity) from the area of the rectangle under the line (which represents the constant velocity portion).
Deena incorrectly described the line for constant velocity as horizontal, while it should be a straight line with a downward slope.
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if the capacitance of its resonator is 4.2×10−13f4.2×10−13f , what is the value of its inductance?
Answers
The value of inductance is approximately 9.47×10^-7 H.
To find the value of inductance, we need to use the formula for resonance frequency:
f = 1 / (2π√(LC))
where f is the resonance frequency, L is the inductance, and C is the capacitance.
We know the value of capacitance (C = 4.2×10−13f), so we can rearrange the formula to solve for inductance:
L = 1 / (4π^2f^2C)
Substituting the given value of capacitance and assuming a resonance frequency of 1 MHz (10^6 Hz) for simplicity, we get:
L = 1 / (4π^2(10^6)^2(4.2×10−13)) = 9.47×10^-7 H
Therefore, inductance is 9.47×10^-7 H.
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need an answer asap
if u know physics pls answer the rest of my question!!
i will give brainliest
Answers
a] negative charge it's e-
can an object be accelerated while traveling at constant velocity? Why or why not?
Answers
Answer:
No: (V2 - V1) / t = a
If the vector velocity of the object does not change during time t then there is no defined acceleration
9. A bicyclist is moving down a hill. Her position on the hill gives her 720 J of potential energy, and her
movement gives her 680 J of kinetic energy. What is her total mechanical energy?
A. 260 J
B. 1400 J
C. 2648 J
D. 2.86×105 J
Answers
The total mechanical energy of the bicyclist is 1400 J, obtained by adding her potential energy of 720 J and kinetic energy of 680 J. The correct answer is option B.
The total mechanical energy of a moving object is the sum of its kinetic energy and potential energy. Kinetic energy is defined as the energy an object has due to its motion, whereas potential energy is the energy an object has due to its position or configuration.Therefore, the total mechanical energy of the bicyclist is calculated by adding her kinetic energy and potential energy. According to the question, the bicyclist has 720 J of potential energy and 680 J of kinetic energy.Total mechanical energy = Potential energy + Kinetic energy = 720 J + 680 J = 1400 JTherefore, the total mechanical energy of the bicyclist is 1400 J. Therefore, the correct answer is option B.For more questions on mechanical energy
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How quickly will a 4 kg ball be accelerated if it is struck by a 12 N force?
Answers
Explanation:
Hey there!
Given that 4kg ball struck by 12 N force.
So, we need acceleration.
Force = Mass × Acceleration
And, so
Acceleration = Force / Mass.
Acceleration = 12/4
Acceleration is equal to 3m/s² in SI units.
Hope it helps :)
A police car is moving east at 20m/s towards a driver who is moving west at 25m/s. The police car emits a frequency of 900Hz. What frequency is detected by the driver? The speed of sound at the time of this occurrence was 343m/s.
Answers
Answer:
f = 2445 Hz
Explanation:
i did the quiz
The frequency that the driver (observer) detects is equal to 1008 Hz
Given the following data:
Observer velocity = 25.0 m/sFrequency of sound = 900 HzSource velocity = 20.0 m/s Speed of sound = 343 m/sTo calculate the frequency that the driver (observer) detects, we would apply Doppler's effect of sound waves:
Mathematically, Doppler's effect of sound waves is given by the formula:
\(F_o = \frac{V \;+ \;V_o}{V\; - \;V_s} F\)
Where:
V is the speed of a sound wave.F is the actual frequency of sound.\(V_o\) is the observer velocity.\(V_s\) is the source velocity.\(F_o\) is the observer frequency.Substituting the given parameters into the formula, we have;
\(F_o = \frac{343 \;+ \;20}{343\; - \;20} \times 900\\\\F_o = \frac{363}{323} \times 900\\\\F_o = 1.12 \times 900\\\\F_o =1008 \;Hz\)
Driver (observer) frequency = 1008 Hz
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True/false: a polarized material must have a nonzero net electric charge.
Answers
The answer is False. A polarized material does not need to have a nonzero net electric charge. Polarization occurs when the positive and negative charges within a material are displaced relative to each other, creating an electric dipole moment.
This can happen in materials such as dielectrics or insulators, which do not conduct electricity. The net electric charge of a polarized material can still be zero, as the overall positive and negative charges remain balanced, but the charges are spatially separated. Polarization plays an important role in phenomena such as capacitance, dielectric constant, and polarization-induced electric fields.
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Which kinship system uses the same terms to refer to parent's siblings as parents, and the same terms to refer to cousins as they would
siblings?
OA Crow
OB. Eskimo
OC. Hawaiian
OD. Omaha
Answers
Answer:
C. Hawaiian
Explanation:
Ego's father and all male relatives in his generation have the same kin name. Ego's mother and all female relatives in her generation are referred to by the same kin term.
Similarly, all brothers and male cousins are linked by giving them the same kin term. Sisters and all female cousins are also referred to by the same term.
What is the potential difference between two points when a 65 C charge requires 250 J to move between the points?
Answers
Answer:
3.85 V
Explanation:
The potential difference between two points can be calculated using the following equation
\(V=\frac{E}{Q}\)Where E is the energy and Q is the charge. So, replacing E = 250 J and Q = 65 C, we get:
\(V=\frac{250J}{65C}=3.85\text{ V}\)Therefore, the potential difference is 3.85 V
As a fish swims deeper into the ocean, the pressure on its body is
a. decreases
b.increases
Answers
Because more water is pushing on an object as it goes more beneath the surface, there is more pressure on the object. Therefore, the pressure increases with depth.
So, your answer is b: increases.
As a fish swims deeper into the ocean, the pressure on its body is:
b.increases
The pressure on the upper surface of the water is the lowest where there is not so much water as of little water pressure, along with a little atmospheric pressure, but if you go deep inside the water the pressure will increases. As on the lower surface of water, the pressure is highest due to heavy water pressure from upwards along with atmospheric pressure. So if a fish swims deeper into an ocean the water will exert more pressure than it is on the upper, to the body of the fish, so the pressure increases.
if the normal force is 196 n and the coefficient of kinetic friction is 0.4, what is the magnitude of the force of friction?
Answers
The correct answer is 78.4 N
The coefficient of friction is the measure of the amount of friction that exists between any two bodies.
Here, we are given,
Force = 196 N
Coefficient of Kinetic friction μ(k)= 0.4
Kinetic friction is directly proportional to the magnitude of force of friction and thus can be calculated as -
\(f_{k}\) = μ x N
\(f_{k}\) = 0.4 x 196
\(f_{k}\) = 78.4 N
Therefore, the magnitude of force of friction on normal force of 196 N and coefficient of kinetic friction 0.4 is 78.4 N.
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Technician A says that LCDs may be slow to work at low temperatures. Technician B says that an LCD dash display can be damaged if pressure is exerted on the front of the display during cleaning. Which technician is correct?
Answers
Answer:
technician B is right
Explanation:
A liquid crystal screen works by the polarization of the molecules that make up the screen by a local electric field, to abalone there must be a light source in the traces pattern in such a way that when a part of the screen is polarized the light manages to come out and we see the image. The polarization of the liquid crystal is a very fast process, therefore Technician A's comment is incorrect.
Liquid crystal displays (LCDs) are generally small and excessive pressure can break the glass and damage the display.
From the previous clarifications, technician B is right
Which waves are used in medicine?
______
A. Gamma and Microwaves
B. X rays and Gamma
C. X rays and Infrared
D. Radio waves and UltraViolet
Answers
Answer:
C
Explanation:
Which of these equations will you used to find the final velocity if the initial
velocity and time is given? *
Answers
Answer:
2.77 would be the answer for this
A 5,000 kg truck moving at 8 m/s has the same momentum as a 2,500 kg car. What is the velocity of
the car?
Answers
Answer:
16m/s
Explanation:
Mv=mv
5000x8=2500x v
V=5000x8/2500
V=40000/2500
= 16m/s
The distance between a charge and the source of an electric field changes from 3 mm to 6 mm.
As a result of the change, the electric potential energy of the charge is ______.
A. divided by 6
B. divided by 2
C. multiplied by 2
D. multiplied by 6
Answers
Answer:
c
Explanation:
The electric potential energy of the charge is divided by 2.
To find the electric potential energy, the values given from the source of an electric field changes from 3 mm to 6 mm.
What is electric potential energy?The electric potential energy is the energy that is needed to move a charge against the electric field.
The energy can be calculated as Work and these energy can be calculated as a whole not only the charges.
Formula for electric potential energy,
U = KQ²/r
where,
K is the constant, k = 9 × 10⁹
Substituting the values of q as the charges and then the distance can be,
U = KQ² / 3 and U = KQ² / 6
So that, the values can be divided by 2.
The unit of electric potential energy is Joule.
The distance can be from r to ∞.
Hence, Option B is the correct answer.
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In her lab, Mrs. Smith is pulling a 28 N block across a surface with a constant speed. If
she must pull with a force of 4.0 N, what is the coefficient of sliding friction between the
block and the lab table?
Answers
Answer:
0.14 is the friction coefficient.
Explanation:
The equation for the friction coefficient is friction coefficient = force/normal force. The force is 4N, and the normal force is 28N. 4/28=0.14.
a 0.29 kg harmonic oscillator has a total mechanical energy of 3.6 j. if the oscillation amplitude is 0.22 meters, what is the oscillation frequency f?
Answers
If the oscillation amplitude is 0.22m, from a 0.29kg harmonic oscillator which has a total of mechanical energy 3.6j, the oscillation frequency is 4.141Hz.
What is oscillation frequency?It is a number of oscillations in the one-time unit, says per second. For example, a pendulum that takes 0.5s to make one full oscillation has a frequency of 1 oscillation per 0.5s or 2 oscillations / second.
How to calculate the oscillation frequency?
mass (m) = 0.29kg
Total energy (E) = 3.6j
amplitude (x) = 0.22m
E = 1/2 k*x^2
k = 2*E / x^2
= 2 * 3.6 / 0.22^2
= 148.76 N/m
Frequency (v) = 1/2π √k/m
= 1/2*3.14 * √148.76 / 0.22
= 4.141Hz
Therefore, the oscillation frequency is 4.141Hz.
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Find the current produced when a voltage of 60 V is applied to a resistance of 15 Ω? What is the equation?
Answers
Answer:
V = IR
Explanation:
V = voltage
I = current
R = resistance
PLEASE HELP ASAP!!
Earthquakes have two kinds of waves, P waves and S waves. These waves may someday help scientists develop an early warning system for earthquakes. The P wave (also called the primary wave) is the first wave, and the S wave (secondary wave) travels after it. Scientists can find the location of an earthquake’s epicenter by subtracting the time that elapses between the P and S waves. A convenient way to find the epicenter is to use a graph like the one shown here.
Suppose that scientists record a P wave on a seismic device at 10 minutes. An S wave reaches the device at 15 minutes (5 minutes later). What is the distance between the recording device and the epicenter of the earthquake? Use the graph to determine your answer.
Answers
Okay, let's break this down step-by-step using the information given and the graph provided:
1) The P wave was recorded at 10 minutes.
2) The S wave arrived 5 minutes after the P wave, at 15 minutes.
3) According to the graph, the P wave travels at a speed of about 5 km/s.
4) The S wave travels at a speed of 3 km/s, which is slower than the P wave.
5) To find the distance to the epicenter, we need to use the difference in travel time between the P and S waves, which is 5 minutes.
6) Since the P wave speed is 5 km/s, in 5 minutes it will travel a distance of 25 km (5 km/s * 5 min).
7) The S wave speed is 3 km/s, so in 5 minutes it will travel 15 km (3 km/s * 5 min).
8) Therefore, the total distance to the epicenter is 25 + 15 = 40 km.
9) So the distance between the recording device and the earthquake epicenter is 40 km.
Does this make sense? Let me know if you have any other questions! I can also re-explain anything if needed.
There are roughly 1500 Km between the earthquake's epicenter and the recording device.
How to find distance?Using the graph, the time difference between the P wave and the S wave corresponds to a distance on the vertical axis. The distance is given in kilometers, convert minutes to seconds before using the graph.
5 minutes is equal to 300 seconds (since there are 60 seconds in a minute). So, see the point on the graph that corresponds to a time difference of 300 seconds (or 5 minutes). This point is located at a distance of approximately 1500 km.
Therefore, the distance between the recording device and the epicenter of the earthquake is approximately 1500 km.
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What is the formula for preventing a collision?.
Answers
The formula for preventing a collision is involved recognize the hazard, Understanding the defense, and at last Act correctly, in time.
The formula for preventing a collision is called RUA, where R stands for Recognize the hazard, Constantly check the street ahead of you, and check your mirrors. Think almost what may happen as distant in progress as possible. Never assume that an unsafe condition will have passed before you reach it. U stands for understanding the defense, There are particular ways to handle most hazardous situations on the street. When you anticipate a danger, you're able to review the circumstance in your mind and visualize your defense so that when the time comes, you are able to act rapidly sufficient to avoid an accident. The arrangement is key and the last A stands for Act correctly, Once you see the risk and choose a defense, act promptly. Never assume that the condition will clear up. The sooner you act the more time you may avoid an accident.
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Draw a free body diagram for the following situations determine the magnitude of the forces and fill in the blanks.
Answers
A net force is also exerting itself on the ball when it begins to fall back to the earth and eventually stops.
Thus, According to Newton's Second Law, an object must be accelerating, or changing speed from second to second, if a net force is operating on it. The soccer ball accelerates when you initially kick it and continues to accelerate as it slows down until it comes to a stop.
The total amount of forces exerted on an object is referred to as its net force.
The total force operating on an item, which may include a number of different forces, is known as the net force acting on the object. The item is not accelerating and is consequently moving at a constant speed if the net force sums to zero.
Thus, A net force is also exerting itself on the ball when it begins to fall back to the earth and eventually stops.
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