To push a heavy box, more force is initially required to overcome static friction than kinetic friction once it's moving. Adding mass increases the required force, and reducing friction with oil makes the process easier.
Pushing a heavy box across the floor requires different amounts of effort due to the static and kinetic friction forces at play. Initially, a greater force is required to overcome static friction, which is the resistance to motion that occurs when two objects are not moving relative to each other. Once the box begins to move, only kinetic friction, which is generally less than static friction, opposes the motion, hence less force is needed to keep the box moving.
If you add mass to the box, such as placing another box on top, you would have to exert more force to both start and maintain its movement. Surfaces with higher friction require more effort to move an object across them, which is why it's harder to push heavy objects on rough surfaces compared to smooth ones. Moreover, when a surface is oiled, friction is reduced, making it easier to start and continue the movement of the box.
What conclusion can you draw based on the data in the scatterplot?
The scatter plot diagram shows us the relation of icecreams with that of consumption
As per the scatter, plot graph shows the increase in the amounts of temperature up to 80° F leads to intake of more ice creams and cones per person going up to 0.56. Hence the increase in temperature lead to changes in buying behavior. More is the temperature more is consumption.Learn more about the conclusion can you draw based on the data in the scatterplot.
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Final answer:
The scatter plot shows a linear pattern, indicating a significant linear relationship between the X and Y variables.
Explanation:
The scatter plot shows a linear pattern in the data, where the points roughly form a straight line. This indicates a linear relationship between the X and Y variables. However, it is important to consider the correlation coefficient as well.
If the correlation coefficient is significantly different from zero, it suggests a strong linear relationship. In this case, there is sufficient evidence to conclude that there is a significant linear relationship between the X and Y variables.
Therefore, the X and Y variables would be good candidates for linear regression to predict outcomes.
What is the potential energy of a 150 kg diver standing on a diving board that is 10 m high?
The potential energy is
J.
Answer:
The potential energy is 14700J.
Explanation:
Definition of potential energy:
Potential energy is the energy that measures the ability of a object to perform a job based solely on its position (height at which the object is from the ground), and it is calculated with the following formula:
Ep= m*g*h Formula (1)
Ep: Potential energy in Joules (J)
m : mass (kg)
g: acceleration due to gravity (m/s²)
h: height (m)
Data
m= 150 kg
g = 9.8 m/s²
h= 10 m
Problem development
We replace data in formula (1)
Ep= 150 kg*9.8 m/s²*10 m = 14700 N*m = 14700J
Ep= 14700J
What keeps the balanced rock balanced
5 A \machine produces compression waves in a spring that is 120 cm long by pulsing twice every second. The back and forth movement of the pulse creates compressed sections of the spring that are 30 cm apart and travel toward the other end of the spring. Which property of the wave does the value of two per second describe? A. wavelength B. intensity C. frequency D. amplitude
Answer:
D. Frequency
Explanation:
The machine produces compression waves in a spring that is 120cm long and it pulse twice every seconds. The property the wave exhibits by exhibiting the value of two per second is the Frequency.
Amplitude of a a wave is the maximum displacement from the equilibrium position. The amplitude of an object is equal to one half the path of the vibration path. The amplitude of a wave is proportional to the amplitude of the source. Amplitude measures how big a wave is . Amplitude of a wave usually look at the energy of a wave so it is not the amplitude .
The frequency of a wave gives the number of wave that passed fixed point at a given time.
Balanced rock has a mass of about 36,000 kg. If the acceleration due to gravity is 9.8m/s^2, what is the force that the rock is exerting in its pedestal
Answer:
Force, F = 352,800 N
Explanation:
Given that,
Mass of the rock, m = 36000 kg
Acceleration due to gravity, [tex]a=9.8\ m/s^2[/tex]
We need to find the force that the rock is exerting in its pedestal. It can be calculated using Newton’s second law of motion as :
F = m × a
[tex]F=36000\times 9.8[/tex]
F = 352,800 Newton
So, the force acting on the rock is 352,800 Newton. Hence, this is the required solution.
A ski lift is used to transport people from the base of a hill to the top. If the lift leaves the
base at a velocity of 15.5 m/s and arrives at the top with a final velocity of 0 m/s, what is the height of the hill? Round the answer to the nearest tenth.
Answer:
it's actually 12.3 on Edge!
Explanation:
Which of the following situations would cause the greatest increase in the motion of molecules in a system? A. The system absorbs 75 J of heat, and its volume is halved. B. The system releases 75 J of heat, and its volume doubles. C. The system absorbs 75 J of heat, and its volume doubles. D. The system releases 75 J of heat, and its volume is halved.
Answer:
The correct answer is A. The system absorbs 75 J of heat, and its volume is halved.
Explanation:
For this question, we want the system's molecular motion to experience an INCREASE. So if your question is asking for a DECREASE in molecular motion, this answer does not apply! Instead, it would be "The system releases 75 J of heat, and its volume doubles." Let me explain.
Molecular motion increases with increasing temperature, since collisions increase. For that reason, we want to look for the answer choice that experiences an increase in temperature, with would mean that the system absorbs (NOT RELEASES) 75 J of heat. Additionally, a system's molecular motion increases when its volume decreases. With a smaller volume, molecules are closer together and hit each other more often, increasing molecular motion. And so, for the motion of molecules to INCREASE, the volume would actually have to decrease or be halved! Answer choice A is correct!
If that explanation isn't enough to sway you, know that I took this computer-scored test and received 100%. If you review your study notes from this unit, you'll see that my answer makes sense. I hope that helped! :)
Which is an example of the force of attraction between two objects that have mass?
A:Gravity
B:Solar energy
D:Electricity
This movement of warmer and cooler mantle rocks creates pockets of circulation within the mantle called _________,
Light bending as it passes through a rain drop is an example of...
A. Transmission
B. Reflection
C. Refraction
The lowest note on the piano has the longest string to vibrate. How does the lowest note compare if you consider the column of air that is vibrating in test tubes or bottles?
Final answer:
Longer piano strings and longer air columns in musical instruments both produce lower notes due to lower frequencies of vibration. The lowest note on a piano correlates with the longest string, similar to how the longest air column in a wind instrument produces the lowest note. For a clarinet, the third harmonic frequency would be three times the fundamental frequency (e.g., 3 × 147 Hz = 441 Hz).
Explanation:
The student's question relates to how vibrations in piano strings and air columns generate sound. For a piano, the pitch of a note is determined by the frequency of the vibrating string, with longer strings producing lower notes. The sound production principles in both cases rely on the physical properties of the system - in the piano, the length, tension, and mass of the string, and in air columns, the length and shape of the column. When comparing to an air column in a test tube or bottle, the longest string on the piano corresponds to the longest air column, which also produces the lowest note. Consequently, the lowest note on the clarinet is produced when all the tone holes are closed, yielding the longest effective length of the air column and hence the longest wavelength and lowest frequency.
In relation to air columns, the frequency of the third harmonic in a clarinet can be predicted based on the fundamental frequency. If the fundamental frequency is 147 Hz, the third harmonic, being three times the fundamental frequency, would be 3 × 147 Hz = 441 Hz.
which of these would be best explained by the Doppler effect? A) the change in frequency as you shorten a guitar string. B) the change in pitch heard as an ambulance approaches you. C) the change in volume as a train pulls away from the station. D) the change in seed of a sound wave as it travels from air into water.
When studying the attraction between objects, which of the following can be concluded?
Answer:
2 , 4
Explanation:
Assume the light waves start out as unpolarized white light. How do light waves incident on the Polarizer and Analyzer behave at their respective angles?
Your brother is insisting that you'll never hear a sound produced behind a barrier wall at the end of your yard. You notice that the door within the wall is open and quickly explain to him that the sound will be able to reach you due to
Sound waves can reach you behind a barrier wall due to the phenomenon of diffraction, which allows them to bend around obstacles and spread into open areas. This is why sounds, unlike light, are still heard through an open door despite a barrier wall obstructing the direct path.
Explanation:The sound will be able to reach you even if it is produced behind a barrier wall as a result of diffraction. This is a wave phenomenon where sound waves bend around obstacles and spread into the space beyond an opening, such as a doorway. Diffraction occurs with waves of all kinds when their wavelengths are comparable to the size of the obstacle or opening they are encountering. Since sound waves have wavelengths that are similar to the size of everyday objects, like doors, they exhibit notable diffraction effects compared to light which has much smaller wavelengths and thus diffracts less.
For example, when someone is playing music in a room, the sound waves travel around and fill the entire space, even through openings like doorways. This can lead to varying sound effects within the room, such as the sound appearing dull in some corners due to destructive interference or standing waves and excessively loud in other areas due to constructive interference. It is the bending or diffraction of sound waves that enables these different acoustic experiences within the room.
Final answer:
Sound waves can diffract around obstacles and reach areas that are not directly in their line of sight. This allows you to hear sound produced behind a barrier wall when the doorway is open.
Explanation:
Sound waves have the ability to bend around obstacles, which allows them to reach areas that are not directly in their line of sight. This phenomenon is known as diffraction.
In the scenario you described, the sound waves produced behind the barrier wall will be able to reach you because they can diffract through the open doorway. The wavelength of sound waves is large enough that it allows them to bend around the edge of the doorway and spread out into the yard.
As a result, you will be able to hear the sound produced behind the barrier wall, even though it is not directly in your line of sight.
If a bar of copper is brought near a magnet, the copper bar will be
Pennfoster:
A. attracted by the magnet.
B. unaffected by the magnet.
C. repelled by the magnet.
D. made into an induced magnet.
What is the speed of a wave if the wavelength is 100 m and the period is 20 s? 2,000 m/s 120 m/s 80 m/s 5 m/s
The speed of the wave is 5 m/s.
What is wave speed?Wavelength and time period both influence wave speed. The distance between two similar spots on adjacent waves is known as the wavelength. Time period is the amount of time needed for a wave to pass a fixed location.
This equation demonstrates how the three variables are connected:
Speed of wave = Wavelength ÷ Time period.
Given parameters:
The wavelength of the wave; λ = 100 m.
Time period of the wave; T = 20 s.
Then, speed of the wave; v = ?
We know that,
The speed of the wave; v = λ/T = (100m/20s) = 5 m/s.
Hence, the speed of the wave is 5 m/s.
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If we mechanically squeeze a gas into a smaller volume, what happens to the pressure and temperature?
A. The pressure and temperature both increase, but we can't predict how much each one will change.
B. The pressure increases and the temperature decreases.
C. Only the pressure increases.
If we mechanically squeeze a gas into a smaller volume the pressure and temperature will increase but we can't predict how much each one will change.
Answer: Option A
Explanation:
When we squeeze a gas or a material, a force acts upon it making it to compress which increases the pressure subsequently as tension and compression is always accompanied by pressure.
The temperature of gas also increases as work is done due to transfer of energy which alters the existing temperature.
These are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine that have created a hole in the ozone
Question 1 options:
smog
acid rain
chlorofluorocarbons (CFCs)
EPA
Answer:
The correct answer is option C,
chlorofluorocarbons (CFCs
Explanation:
The chlorofluorocarbons (CFCs) were being used in air conditioners, aerosol spray cans, and industrial cleaning products since 1960s. These CFCs are inflammable, but once they are into atmosphere they move to the upper stratosphere and there they enter into a never ending chain reaction thereby releasing chlorine . The free chlorine react with ozone and destroy its molecule.
i'll make u the brainlyist
Which three forms of light are invisible light?
A.blue light
B.infrared rays
C.radio waves
D.red light
E.x-rays
The unit for measuring the rate at which light energy is radiated from a source is the
A. candela.
B. lumen.
C. lux.
D. Angstrom.
Please explain
Which is a unit rate
A)47c for 2 pens
B)20 gallons or 2 hours
C)15 hours for 3 months
D)18 miles driven in a week
Answer: D) 18 miles driven in a week
Explanation:
A unit rate describes how many units of the first type of quantity corresponds to one unit of the second type of quantity.
a. 47 c for 2 pens
thus the price is for 2 pens and not 1.
b. 20 gallons or 2 hours
Thus the amount of gasoline used is for 2 hours and not 1.
c. 15 hours for 3 months
Thus the time given is for 3 months.
d. 18 miles driven in a week
The distance given is for 1 week and thus is the unit rate.
Thus unit rate is 18 miles driven in a week.
A study published in Science notes that water flowing from the Atlantic Ocean into the Arctic is warmer than it's been in 2,000 years. Scientists believe that this increased heat input has far-reaching consequences to life on Earth. U.S. and European scientists studied the Fram Strait branch of the North Atlantic Current, the ocean current that carries heat north from the tropics. By studying tiny-shelled organisms called foraminifera found deep in the ocean floor, they could chart temperatures going back 2,000 years. From their findings, scientists reported that the water has warmed about 2o C since the late 1800's. We would expect warmer Northern Atlantic currents to have all BUT ONE of these consequences on Earth.
Answer:
C
Explanation:
decreased precipitation
how to calculate the total current of a circuit which has both parallel and series connection
What is the energy of a photon with a frequency of 2.2 × 1016 Hz? Planck’s constant is 6.63 × 10–34 J•s.
1.5 × 10–17 J
8.8 × 10–17 J
1.5 × 10–16 J
8.8 × 10–16 J
Taking into account the definition of photon and energy of a photon, the correct answer is the first option: The energy of a photon with a frequency of 2.2×10¹⁶ Hz is 1.5×10⁻¹⁷ J.
You have to know that electromagnetic radiation carries energy, which can be absorbed or emitted. To explain the processes of emission and absorption, Plank and Einstein proposed that the energy of radiation is composed of indivisible units (quanta). In each elemental process only a quantum of light can be emitted or absorbed. Each of these quanta was called a "photon".
The exchanges of energy between matter and radiation take place not continuously, but by discrete and indivisible quantities or quanta of energy. The quantum of energy is proportional to the frequency of radiation.
The relationship between the amount of energy (E) transported by the photon and its frequency (f) is determined by the following expression, where the energy of a photon is obtained by multiplying Planck's constant h by the frequency f of electromagnetic radiation:
E=h×f
In this case, you know:
h= 6.63*10⁻³⁴ Jsf= 2.2×10¹⁶ HzReplacing:
E= 2.2×10¹⁶ Hz× 6.63×10⁻³⁴ Js
E= 1.4586×10⁻¹⁷ J≅ 1.5×10⁻¹⁷ J
The correct answer is the first option: The energy of a photon with a frequency of 2.2×10¹⁶ Hz is 1.5×10⁻¹⁷ J.
Learn more:
https://brainly.com/question/8924116?referrer=searchResultshttps://brainly.com/question/6945706?referrer=searchResultshttps://brainly.com/question/8000078?referrer=searchResultsPlease select the word from the list that best fits the definition the name for continents in one landmass surrounded by gigantic ocean
Answer:
subcontinent
Explanation:
a subcontinent is a large landmass, smaller than a continent
The Earth's surface is divided up into several large, movable tectonic plates. Which of the following is true about these plates? A. The Earth has both continental and oceanic tectonic plates. B. The Earth has only oceanic tectonic plates. C. The Earth has neither continental nor oceanic tectonic plates. D. The Earth has only continental tectonic plates.
Answer:
the answer is A, the earth has both continental and oceanic tectonic plates.
Explanation:
hope this helped:)
The Earth's surface is divided up into several large, movable tectonic plates, that can be the Earth has both continental and oceanic tectonic plates.
What is tectonic plates?
The Earth's permeable outside husk can be separated or splits in to large parts is called tectonic plates. They are thick layer of warm fluid-rock which are gliding on the Earth's mantle. Plate tectonics forms the oceans, continents, and mountains. Most plates are composed of both continental and oceanic crust.
The lithosphere used to split up into the following parts,
seven very large continental- and ocean-sized plates,six or seven medium-sized regional plates, several small ones.The method of plate tectonics may be inspired by convection in Earth’s mantle, the extraction of heavy old pieces of crust into the mantle, or some combination of both.
Hence, Option A is the correct answer.
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Metamorphic rocks are made from
I .sedimentary rocks
II.igneous rocks
III.other metamorphic rocks
A. I and III only
B. III only
C. I and II only
D. I, II, and III
The specific heat of iron is 0.11 cal/goC. A cafeteria fork made of iron has a mass of 20 grams. How much heat energy is needed to raise the temperature of this form from 25oC to 75oC?
0.044 calories
0.275 calories
110 calories
9090.9 calories
Answer: 110 cal
It is given that he specific heat of Iron is [tex] 0.11 cal/g^o C[/tex].
Mass of iron fork 20 g
Heat energy is needed to raise the temperature of this from [tex] 25^o C to 75^o C [/tex]
we can use the following formula to calculate heat energy:
[tex] Q=mC \Delta T [/tex]
where Q is the heat required to raise the temperature by [tex]\Delta T[/tex] of a mass m having specific heat C.
Insert the values:
[tex] Q=20 g \times 0.11 cal/g^oC (75^o C -25^o C)\\\Rightarrow Q=(2.2\times50)cal=110 cal[/tex]
Thus, heat required to raise the temperature of iron fork is 110 cal.
A _____________________ _______________________, current moves through multiple
paths at once. If one part fails, the other parts can still work.
Answer: Parallel Circuit
A parallel circuit has current that is involve in two or more paths for the electricity to flow and the loads are parallel to each other. If the loads in this circuit were light bulbs and one part fails, the other parts can still work because there is still current flowing to the others for they are still in a direct path from the negative to positive terminals of the electric source or battery.