A boy is going down a slide. As he reaches the bottom, friction causes him to slow down and stop. Which one of Newton's laws is this?
2nd law
3rd law
1st law
4th law
Answers
The given condition satisfies the Newton's First Law of motion. Hence, option (C) is correct.
Given data:
A boy slides down and friction causes him to slow down and stop.
In the given problem, when boy was sliding down, then he was in the state of motion, such that the when the he reaches at the bottom of hill, the friction plays the role of external agent to stop its motion.
This shows that the first law of motion is clearly followed which says that, "If an object is in motion, then it will be in motion until and unless any external force is applied on it". This is also known as law of inertia.
Thus, we can conclude that the given condition satisfies the Newton's First Law of motion. Hence, option (C) is correct.
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Related Questions
An object may have potential energy because of its___. A) speed. B) acceleration. C) momentum. D) location. E) none of these
Answers
Answer:
the answer is D
Explanation:
the answer is location because of its state at rest in which energy is stored and is resting from a particular height
For Example
an object of mass 5kg is resting on a table which is 10m high from the ground. calculate the potential energy of the object.(g=10m/s²)
solution
m=5kg
h=10m
g=10m/s²
Formula for potential energy is mgh
where m=mass of the object,h=height from which the object is resting,g=acceleration due to gravity
P.E=mgh
=5×10×10
P.E=500J
Apply 16N to move crate 4m. How much work was done?
Answers
Work = force *distance
DLite Dry Cleasers is owned and operatod by Joel Paik. A buidng and ecuipment are curtently Eeng reieed, pencting expansoon fo new facities The actiat werk durng dwy an w4frraxieed as folown. b. Pas 150000 for the purshase of land adjacent to land currentty owned by DL he Dry Cleaners as a kute buitsing site 6. Recelied casb from cistomars fot tory deaning fevenue. $34.125 if Paid rent for to month, 56 co9 e: Puichaned aupplies of account, 62,600 1. Paid creators on acoount st2 800 . a. Charbed eublomen for dre deatina revenue on account sH4.750. a Charged culfomers for dry cleaning rovenue on acooumt, $34.750. In. Fiece, ed mantefy nocice for dry clessng expense lor July (to be paid on August 10), $29,500. I Recoviad each form customorn on acoount, 568000 4. Detemined that the cest of supples on hand was $5,900; therofore. the cost of sipples used duting the month was 33.600 1 Pais dividends, $12000, Reauired; 1 Detemine the amount of fetaned compgs as of Juy 1,20rd. bebiw the equation, indicate increases and deeresses resulting fom cach transaction and the new balancos affer each transachion. 3.a Reare an boome atakenent tor the mantm endod Juy 31.20YA. 1. Pad ovisends, s12:000. Required: 4. Prepare a tatmentof cad inws tor duy.
Answers
To determine the new retained earnings as of July 31, 20rd, we can use the given information:
Retained earnings, July 1, 20rd: $259,725
Increases: Net income (Part B) = $10,325
Decreases: Dividends (Part C) = $12,000
The calculation for new retained earnings, July 31, 20rd would be:
Retained earnings, July 31, 20rd = Retained earnings, July 1, 20rd + Increases - Decreases
Retained earnings, July 31, 20rd = $259,725 + $10,325 - $12,000
Retained earnings, July 31, 20rd = $258,050
Therefore, the new retained earnings as of July 31, 20rd is $258,050.
The statement of cash flows for July would be as follows:
Statement of Cash Flows for July
Cash flows from operating activities:
Cash inflows:
Cash from customers $68,000
Cash outflows:
Payments for rent $(5,600)
Payments for supplies $(62,600)
Payments to creditors $(12,800)
Payments for utilities $(4,750)
Net cash flows from operating activities $(17,750)
Cash flows from investing activities:
Cash outflows:
Purchase of land $(150,000)
Net cash flows from investing activities $(150,000)
Net increase (decrease) in cash $(179,750)
Plus: Cash balance, July 1, 20rd $294,000
Cash balance, July 31, 20rd $114,250
Please note that the information provided assumes a cut-off date of July 31, 20rd.
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.physics wave. Please don't dare to answer irrelevant
Answers
Answer:
1a) 857143 m
1b) 414 m
2a)
2b)
3) the medium of air has a wavelength of 0.334 m, the medium of water has a wavelength of 1.493 m, and the medium of 5.130 m.
Explanation:
Question 1a)
Given the velocity/speed, and frequency of the wave, the length can be calculated using these two quantites.
[ λ = v / f ] wavelength = velocity of the wave / frequency of the wave in Hz.
Since 3 × 10^8 × ms^-1 is the velocity, and 350Hz is the frequency.
Anything to the negative power is reciprocated. i.e ms^-1 = m/s.
The wavelength is 300000000m/350Hz = 857142.8571428..... m ≈ 857143 m
Question 1b) Given that the frequency of the second wave in water is 1% of the first wave, and the speed of the second wave is 1450ms^-1
Therefore the second wave has a frequency of 1% of 3.5 = 350/100 Hz = 3.5 Hz
The wavelength is found using the same
formula: wavelength = 1450m/3.5Hz = 414.2857142857.... m ≈ 414 m
Question 2a)
Question 2b)
Question 3) Remember, the speed of sound of the medium = frequency of the medium × wavelength of the medium.
Therefore the wavelength of the medium = speed of sound of the medium / frequency of the medium. This has a similar correlation to the wavelength formula. We are given that all these mediums have a frequency of 1KHz = 1000Hz, where So the wavelength of each medium =
Question 4)
Select the correct answer. the lens in the eyepiece of a telescope magnifies light by bending it. what is this bending called? a. absorption b. dispersion c. radiation d. reflection e. refraction
Answers
This bending of light is called "refraction".
What is Refraction?Simply said, reflection is the act of light reflecting back when it strikes a medium on a plane. Refraction is the process by which light shifts as it travels through a material, causing the light to bend. The medium receives the light that originally entered it back.
Refraction is the scientific term for this bending of light. It occurs when light travels through one medium and then through another where the speed of the light is different. It occurs when light travels from the air into the glass in the telescope eyepiece or even in your spectacles.
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Answer:
E. refraction
Explanation:
2. At 02Z16 February, the air pressure was about mb, the lowest of the 24-hr period. a. 1008 : b. 1012 c. 1020 d. 1024 3. From 16Z15 February to 02Z16 February, the air pressure at Pittaburgh was __. During this period, the storm system and its fronts were just to the south of Pitssburgh, having moved swiftly up from the Gulf Coast the 12 hrs prior. a. steadily falling b. mostly steady c. steadily rising 4. Between 16Z15 February to 02Z16 February, the air pressure change was approximately mb, a. −13 b. −5 c. 0 d. +7 c. +11
Answers
The lowest air pressure at 02Z16 February was approximately 1008 mb. From 16Z15 February to 02Z16 February, the air pressure at Pittsburgh was steadily falling. The air pressure change between 16Z15 February and 02Z16 February was approximately -13 mb.
In the given options, the lowest air pressure at 02Z16 February corresponds to option (a) 1008 mb. This indicates that at that particular time, the air pressure was around 1008 millibars.
During the period from 16Z15 February to 02Z16 February, the air pressure at Pittsburgh was steadily falling. This suggests a decrease in atmospheric pressure over time, indicating the presence of a weather system or storm in the vicinity. The statement mentions that the storm system and its fronts were just to the south of Pittsburgh, having moved swiftly up from the Gulf Coast in the 12 hours prior. This movement of the storm system can explain the steady decrease in air pressure observed during the given time period.
The air pressure change between 16Z15 February and 02Z16 February was approximately -13 mb. This means that the air pressure decreased by approximately 13 millibars during that time interval. The negative sign indicates a decrease in air pressure, which is consistent with the statement mentioning the steadily falling air pressure during the given period. The air pressure change is an important parameter in weather forecasting as it provides insights into the atmospheric conditions and the movement of weather systems.
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An inductance L and a resistance R are connected in series to an ideal battery. A switch in the circuit is closed at time t
Answers
Maximum energy stored at the time t = (L/R) ln 2 after the switch is closed
The magnetic field stops expanding when the current in a practical inductor achieves its steady-state value of Im = E/R. The power p = vi is also 0 because the voltage across the inductor has fallen to zero. As a result, the inductor's ability to store energy grows only as the current approaches its steady-state value.
The magnetic field's maximum stored energy is constant when the current is stable. The inductance of the practical inductor does not store any extra energy, but the inductor's resistance continuously loses energy. The magnetic field must continue to exist. current.
The area under the power curve represents the maximum energy stored by the inductance and is equal to the product of the average power and the elapsed time.
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What is the wavelength of light waves if their frequency is 5.0x1014 Hz and the speed of light 3 x
108 m/s?
A. 0.60 m
B. 6.0 mm
C. 0.060 mm
D. 0.60 um
Answers
Answer:
D. 0.60 um
Explanation:
Given the following data;
Frequency = 5.0x10^14 Hz
Speed = 3 x 10^8 m/s
To find the wavelength;
Wavelength = speed/frequency
Substituting into the equation, we have
Wavelength = 3 x 10^8/5.0x10^14
Wavelength = 6 × 10^7m
But 1 meter (m) = 1000000 micrometer (um)
6 × 10^7 meter = 0.6 micrometer.
Describe in words how the nucleus of an atom changes when it undergoes alpha decay.
Answers
Alpha decay is a type of nuclear decay occurring by the emission of alpha particles. Thus the nuclei changes to a new nuclei with mass number decreased by 4 units and atomic number decreased by 2 units from the parent atom.
What is nuclear decay?Nuclear decay is the process of radioactive decay of unstable isotopes to form its stable isotopes or new nuclei. Unstable atoms undergo nuclear decay by the emission of alpha or beta particles or by electron capture.
In alpha decay, an alpha particle that is a helium nuclei is emitted with the new nuclei where the mass number reduces by 4 and atomic number reduces by 2.
For instance consider the alpha decay of carbon -14 produces stable beryllium -10 with an alpha particle.
Similarly in Alpha decay, an electron is emitted where the atomic number increases by one and mass number does not change.
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it's assumed that even if europa has life, the total amount of that life will be small. that's because
Answers
It is assumed that even if Europa has life, the total amount of that life will be small. This is due to the fact that Europa is a relatively small moon compared to other planetary bodies, and also because it lacks a substantial atmosphere that could support larger and more complex forms of life.
Additionally, the harsh environment on Europa, including its icy surface and potential for radiation exposure, would likely limit the growth and reproduction of any organisms that do exist. Therefore, while there may be some form of life on Europa, it is likely to be in small numbers and in less complex forms than what we see on Earth.
The total amount of life on Europa is assumed to be small because the harsh conditions on its surface and the potential limited resources within its subsurface ocean make it difficult for life to thrive. The lack of sunlight and energy sources also limit the potential for complex life forms to develop.
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A pinball bangs against a bumper of a pinball machine with a speed of 0.46 m/s. If the ball has a mass of 0.058 kg, what is the ball's kinetic energy?
This needs to be done in 3 mins
Answers
Answer:
Okay I might be wrong and sorry if i am either its 12 or 0.402
Explanation:
* I recommend the second one cause its more logical
Be aware I might be wrong
Describe how you would find absolute pressure in a car tire if you had a barometer and a tire pump with an air
pressure gauge
Answers
The absolute pressure in a car tire can found by following method:
Pressure is the force per unit area applied toward a course perpendicular to the outer layer of an item. To keep it precise, it is an amount of force following up on a unit area. The SI unit for pressure is measured in Pascals (Pa). Other non-SI units are bar and PSI. There are two types of references to quantify pressure,
Gauge Pressure
Absolute Pressure
The most well-known pressure reference is Gauge Pressure which is connoted by a ‘g’ after the pressure unit, for example, 33 psi g. It is the pressure relative to barometric or atmospheric pressure; it is positive for pressures above atmospheric pressure and negative for pressures that are below atmospheric pressure. An Absolute pressure estimation is one that is alluded to as a perfect or an ideal vacuum. The best illustration of an absolute referenced pressure is the calculation of Barometric pressure. To deliver an absolute pressure sensor, one strategy is for a maker to seal a high vacuum behind the detecting diaphragm.Formula of Absolute pressure is given by:
p(a) = p(g) + p(atm)
Where ,
p(a) is absolute pressure,
p(g) is gauge pressure and
P(atm) is atmospheric pressure
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On a typical day at an ocean port, the water has a maximum depth of 20m at 8:00 am. The minimum depth of 8m occurs 6.2hrs later. Assume that the relation between time and water depth is a sinusoidal function. The period and median depth of this data are
Answers
The median depth of the sinusoidal function is 14m represents the average or middle value of the water depth over one complete cycle.
To determine the period and median depth of the sinusoidal function that relates time and water depth at the ocean port, we need to analyze the given information.
The period of a sinusoidal function represents the time it takes for one complete cycle. In this case, the period would be the time it takes for the water depth to repeat its pattern.
Given that the maximum depth of 20m occurs at 8:00 am and the minimum depth of 8m occurs 6.2 hours later, we can calculate the period as follows:
Period = Time for one complete cycle = Time of minimum depth - Time of maximum depth
Period = 6.2 hours
Finally, the period of the sinusoidal function is 6.2 hours.
The median depth represents the average or middle value of the water depth over one complete cycle. To find the median depth, we can calculate the average of the maximum and minimum depths:
Median depth = (Maximum depth + Minimum depth) / 2
Median depth = (20m + 8m) / 2
Median depth = 14m
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Describe how magma changes form through the rock cycle to become magma again eventually.
Answers
The process by which magma changes form through the rock cycle to become magma again eventually is described in the following steps:
magma is formed from the melting of rocksmagma solidifies to form igneous rocks.igneous rocks undergo weathering forming sedimentthe sediment is compacted to form sedimentary rocksthe sedimentary rocks become metamorphic rocksthe metamorphic rocks melt to form magmaWhat is the rock cycle?The rock cycle refers to the process by which the three main types of rocks—igneous, metamorphic, and sedimentary—are formed and decomposed according to various applications of heat and pressure over time.
For instance, when heat and pressure are applied to sedimentary rock shale, slate is formed.
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I need help pls. Solve 1+cos 30º/1-sin 30º. Plz help me
Answers
Answer:
\( \huge \boxed{ \boxed{2 + \sqrt{3}}} \)
Explanation:
to understand thisyou need to know about:trigonometryPEMDASgiven:\( \frac{1 + \cos( {30}^{o} ) }{1 - \sin( {30}^{o} ) } \)tips and formulas:cos(30°)=\(\frac{\sqrt{3}}{2}\)\( \sin( {30}^{o} ) = \frac{1}{2} \)let's solve:\( \sf sustitute \: the \: value \: of \: \sin( {30}^{o} ) and \cos( {30}^{o} ) \\ \sf \frac{1 + \frac{ \sqrt{3} }{2}}{1 - \frac{1}{2} } \)\( \sf simplify : \\ \frac{ \frac{2 + \sqrt{3} }{2} }{ \frac{1}{2} } \)\( \sf simplify(fraction) : \\ \frac{2 + \sqrt{3} }{2} \div \frac{1}{2} \\ \frac{2 + \sqrt{3} }{2} \times 2 \\ \therefore 2 + \sqrt{3} \)Ten children measured and recorded how high they could jump. The results they recorded, in inches, were as follows:
8, 9, 8, 6, 8, 12, 9, 10, 11, 16
What is the median of these measures?
Answers
i hope this helps you!
Predict what would happen if control rods were not used in nuclear reactors. Include the function of
control rods in your prediction.
Answers
We have that if control rods were not used in nuclear reactors, the following might occur
The fission rate control of reactor elements will not be possiblebut we shall look into what control rods functions are
A control rod functions impacts the nuclear reactor functions such as the thermal power, steam amount produced and the generated electrical energy The manipulation of rod assemblies is a function of Control rods They are then put into what we call information tubes inside a gas of reactor elements.The function of control rodThe main function of control rods has its place in a nuclear reactor and is used in the the fission rate control of reactor elements
Operation of thermal neutrons see it interact with variant reactors(Boiling water reactors, pressurized water reactors and heavy water reactors) Breeder reactors operate with fast neutrons.The manipulation of rod assemblies is a function of Control rods They are then put into what we call information tubes inside a gas of reactor elements. A control rod functions impacts the nuclear reactor functions such as the thermal power, steam amount produced and the generated electrical energy The number of control rods inserted and the distance to which they are inserted can be varied to control activity. Typical shutdown time for modern reactors such as the European Pressurized Reactor or Advanced CANDU reactor is 2 seconds for 90% reduction, limited by decay heat.As a safety measure, control rods are to the lifting gear through ability of electromagnets, as an choice than direct mechanical discharge. This talent that in the tournament of strength failure, or if manually invoked due to failure of the lifting machinery,the control rods fall automatically, underneath gravity, all the way into the pile to cease the reaction. A excellent exception to this fail-safe mode of operation is the BWR, which requires hydraulic insertion in the match of an emergency shut-down, the usage of water from a extraordinary tank underneath excessive pressure. Quickly shutting down a reactor in this way is known as scramming.
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What to do?
Before an earthquake
_______________.
During an earthquake
_______________.
After an earthquake
_______________.
Answers
During an earthquake, you should follow that plan and remain safe.
After an earthquake, you should check your surroundings to see if everything is fine now. And go to a safe place.
a car travels 200km in the first 2.5 hours of a trip. it stops half am hour and then travels final 200km in 2 hours. find the average speed of the car.
Answers
Answer:
total distance 400km
time 4.5
average speed is 100km
Ketch the electric field for a) a negative point charge near a poitively charged plate
Answers
However, the electric field in the centre of the two plates will equal the total of the two electric fields generated by the plates and will be directed from the left plate to the right plate.
The electric fields E is a vector quantity that exists at all points in space. The electric field at a given point represents the force that would be exerted on a unit positive test charge if it were placed there.
The electric field is associated with the electric force that operates on any charge. E with a vector on top equals the start fraction, F with a vector on top divided by q equals the end fraction.
Newtons/coulomb, N/C N/Cstart text, N, slash, C, end text are the dimensions of an electric field. The electric force may be expressed in terms of an electric field, F, with a vector on top, equaling q, E, with a vector on top.
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if a photon's wavelength is 663 µm, what is its energy? a) 4.40×10−46J
(b) 4.40×10−43 J
(c) 3.00×10−25 J
(d) 3.00×10−28 J
Answers
The energy of the photon with a wavelength of 663 µm is approximately 2.99 × 10^-19 J. None of the given answer choices match this value.
To calculate the energy of a photon, you can use the equation E = hc/λ, where E represents the energy, h is the Planck's constant (approximately 6.626 × 10^-34 J·s), c is the speed of light (approximately 3.00 × 10^8 m/s), and λ is the wavelength.
In this case, the given wavelength is 663 µm, which can be converted to meters by dividing by 10^6. So, λ = 663 × 10^-6 m.
Now, substituting the values into the equation, we have:
E = (6.626 × 10^-34 J·s × 3.00 × 10^8 m/s) / (663 × 10^-6 m)
E ≈ 2.99 × 10^-19 J
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Which of the following scenarios demonstrates a transfer
between kinetic energy and potential energy?
Answers
Answer:
what scenarios? but kinetic is energy in motion (like a ball rolling) and potential is stored energy (ball laying on ground)
example (kinetic to potential) : baseball flying and and lands on the ground then stops rolling
roller coaster rolling down a hill then stopping (kinetic to potential)
roller coaster on top of a hill and then going down (potential to kinetic)
Explanation:
calculate the magnitude of the electric field intensity in vacuum at a distance of 20 cm from a charge of 5 * 10 raise to power - 3 column
Answers
Answer:
1.1259*10^9 Newton per Columb
Explanation:
the magnitude of the electric field intensity can be calculated using the expresion below;
E=Kq/r^2
Where k= constant
q= electric charge
r=distance= 2cm= 20*10^-2m( we convert to m for unit consistency
:,K=59*10^9 Columb
If we substitute the value into above formula we have
E=(9*10^9)*(5*10^-3)/(20*10^-2)^2
=1.1259*10^9 Newton per Columb
Therefore,the magnitude of the electric field intensity in vacuum at a distance of 20 cm is 1.1259*10^9 Newton per Columb
Which of the following is a derived physical quantity?
A. Time
B. Mass
C. Length
D. Volume
Answers
When you create a best fit line what is the expected value of the slope?
Answers
When you create a best-fit line, the expected value of the slope represents the average rate of change in the dependent variable (y) for every unit increase in the independent variable (x). The slope helps you make predictions and understand the relationship between the two variables in your dataset.
When you create a best-fit line, the expected value of the slope is the coefficient that represents the rate of change between the two variables being analyzed. The slope is determined by finding the ratio of the change in the dependent variable to the change in the independent variable.
It is important to note that the slope of a best-fit line is not always a perfect representation of the true relationship between the variables, but rather an approximation based on the available data. Therefore, the expected value of the slope is subject to variation and uncertainty depending on the specific data set and methodology used to create the best-fit line.
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Wind is:
A) Electricity
B) A type of sound
C) A type of precipitation
D) The movement of air molecules
Answers
Answer:
d
Explanation:
ignore this part djnddjkd
Women in dentistry. 50 years ago there were practically no women in dentistry, what changed now?
Answers
Explanation:
what change now is because in this century every one got equal rights
slow-wave sleep occurs in three stages, each displaying progressively slower eeg waves of higher frequency. true false
Answers
"Slow-wave sleep occurs in three stages, each displaying progressively slower EEG waves of higher frequency." False.
On an electroencephalogram (EEG), slow brain waves, commonly referred to as deep sleep or non-rapid eye movement (NREM) sleep, are indicative of slow-wave sleep. The assertion that slow-wave sleep happens in three stages with progressively slower, higher-frequency EEG waves is untrue.
Stage 3 (N3) and Stage 4 (N4) are the two primary stages of slow-wave sleep. These stages are characterized by delta waves, which are slow oscillations with high amplitudes and a frequency range of 0.5 to 4 Hz. These delta waves demonstrate how slow-wave sleep is deep and rejuvenating.
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Which option is an example of a conceptual model?A. mental image of gas molecules as tiny ballsB. A weather map created by Doppler radarC. A clay ball with a slice cut out, showing the layers of EarthD. A diagram of a flagpole and its shadow with measurements provided to calculate the length of the shadow
Answers
From the given options let's select the example which shows a conceptual model.
A conceptual model can be said to be a model which shows an abstract representation of any concept which can be visualized or imagined than other models.
It is a model which the designers want users to understand.
From the list, the best option which is an example of a conceptual model is a mental image of gas molecules as tiny balls.
Let's say, for example, you imagine or have a mental picture of gas molecules using your imagination, it helps to understand how a vacuum system works and you can easily solve the problem if something goes wrong.
Therefore, the example of a conceptual model is:
A mental image of gas molecules as tiny balls.
• ANSWER:
A. mental image of gas molecules as tiny balls
can you explain the three main important reason why we use machine
Answers
Answer:
HERE IS YOUR ANSWER
Explanation:
1. The machines makes pur life easier.
2. It makes us do our works faster.
3. It does all the works that are harder for us.
Hope it helps you.
Explanation:
First of all some do most of the work for us
Second, us humans are quite lazy
Third, it makes it quite easier in life