Answers
I think it is D. Force
Answer:
Explanation:
Do you mean tire tracks?
If you do then the tracks show that there must have been a lot of heat involved. When the tires skid, the friction produced must be awfully hot to stop and 800 kg vehical (which is pretty small). The tire tracks that you see are bits of melted rubber taken from the tire.
Force is involved, but heat is the better answer.
gravity is necessary for friction to take place. If you were out in space, you could not get enough friction to leave tire tracks. (Force is awfully small).
Lubrication is there to give you a 4th choice. The exact opposite is what takes place. Lubrication reduces friction.
Related Questions
By how many decibels does the intensity level of a sound decrease when you triple your distance from a source of sound?.
Answers
The intensity level of a sound decreases by approximately 6 dB every time you double your distance from the source. Therefore, when you triple your distance from the source, the intensity level of the sound will decrease by approximately 18 dB.
What is source?Intensity level is a measure of the strength of a stimulus, stimulus being anything that causes a reaction in an organism or system. It is a quantitative measure of the magnitude of a physical phenomenon, such as sound or light. It is most commonly expressed as a numerical value and is typically measured in decibels (dB). Intensity level is an important concept in fields such as audio engineering, physics, and sensory science, as it is used to measure the strength of a stimulus and to compare different stimuli. For example, the intensity level of a sound is a measure of how loud it is, while the intensity level of light is a measure of how bright it is.
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You leave a pastry in the refrigerator on a plate and ask your roommate to take it out before youget home so you can eat it at room temperature, the way you like it. Instead, your roommateplays video games for hours. When you return, you notice that the pastry is still cold, but thegame console has become hot. Annoyed, and knowing that the pastry will not be good if it ismicrowaved, you warm up the pastry by unplugging the console and putting it in a clean trashbag (which acts as a perfect calorimeter) with the pastry on the plate. After a while, you find thatthe equilibrium temperature is a nice, warmTeq.. You know that the game console has a mass ofm1. Approximate it as having a uniform initial temperature ofT1. The pastry has a mass ofm2and a specific heat ofc2, and is at a uniform initial temperature ofT2. The plate is at the sameinitial temperature and has a mass ofm3and a specific heat ofc3. What is the specific heat ofthe console
Answers
Answer:
\(c_{e1} = \frac{(m_2 c_{e2} \ + m_3 c_{e3} ) \ (T_{Teq} - T_2) }{m_1 (T_1 - T_{eq}) }\)
Explanation:
This is a calorimeter problem where the heat released by the console is equal to the heat absorbed by the cupcake and the plate.
Q_c = Q_{abs}
where the heat is given by the expression
Q = m c_e ΔT
m₁ c_{e1) (T₁-T_{eq}) = m₂ c_{e2} (T_{eq} -T₂) + m₃ c_{e3} (T_{eq}- T₁)
note that the temperature variations have been placed so that they have been positive
They ask us for the specific heat of the console
\(c_{e1} = \frac{(m_2 c_{e2} \ + m_3 c_{e3} ) \ (T_{Teq} - T_2) }{m_1 (T_1 - T_{eq}) }\)
An object starts at position 12 on a horizontal line with a reference point of 0. What is the position of the object if moves 14 units to the left?
Answers
If the object starts at position 12 on a horizontal line with a reference point of 0, then its initial position relative to the reference point is:
Initial position = Reference point + Object's position = 0 + 12 = 12
If the object then moves 14 units to the left, its new position relative to the reference point is:
New position = Initial position - Distance moved to the left = 12 - 14 = -2
Therefore, the position of the object is -2 units from the reference point, which means that it has moved 2 units to the left of the reference point.
Which statement is true about the theory of plate tectonics and the theory of continental drift?
A) The theory of plate tectonics proves the theory of continental drift completely wrong.
B) The theory of plate tectonics tells exactly where the continents were before Pangaea divided.
C) The theory of plate tectonics gives the method by which continents can move as part of plates.
D) The theory of plate tectonics does not explain how continental movements could occur.
Answers
The statement that is true about the theory of plate tectonics and the theory of continental drift C. The theory of plate tectonics gives the method by which continents can move as part of plates .
What is theory of plate tectonics and the theory of continental drift ?According to the scientific hypothesis of plate tectonics, the underground movements of the Earth create the primary landforms. By explaining a wide range of phenomena, including as mountain-building events, volcanoes, and earthquakes, the theory, which became firmly established in the 1960s, revolutionized the earth sciences.
The scientist Alfred Wegener is most closely connected with the concept of continental drift. Wegener wrote a paper outlining his notion that the continents were "drifting" across the Earth, occasionally crashing through oceans and into one another, in the early 20th century.
According to tectonic theory, the Earth's surface is dynamic and can move up to 1-2 inches every year. The numerous tectonic plates constantly move and interact. The outer layer of the Earth is altered by this motion. The result is earthquakes, volcanoes, and mountains.
Therefore, option C is correct.
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How does something(the big bang) come from nothing by nothing i mean the first universe although we don't know where the first universe is but we do know that nothing can't come from something.
Answers
The Big Bang theory is the most widely accepted explanation for the origins of the universe, but it does not necessarily imply that the universe emerged from nothing.
It is possible that new discoveries or insights may shed light on this fundamental question in the future. The universe may have arisen from a pre-existing state or through some other natural process that we do not yet understand.
Instead, the theory describes how the universe underwent a rapid expansion from a very dense and hot state. The conditions and laws of physics that applied during the earliest moments of the universe may not necessarily be the same as those we observe today, and there are many unknowns and uncertainties in our understanding of these early stages.
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PLEASE FAST 50 POINTS SPACE QUESTION
Explain how Earth's tilt affects the amount of incoming solar radiation and when Earth is tilted toward and away from the Sun
Answers
The more slanted the sun's rays are, the longer they travel through the atmosphere, becoming more scattered and diffuse. In the winter, Earth tilts away from the Sun.
Calculate the net force on the particle q1.
Answers
Answer:
-12.1
Explanation:
i’m almost sure this is it, i’m checking my old answers
if not let me know and i’ll give you some more answers
8. What is the mass and charge of a proton?
A. 1 amu, no charge
B. 1 amu, charge of +1
C. Mass of O, charge of -1
D. None of the above
Answers
B.
Step By Step Explanation:
find the decrease in kinetic energy from the collision for the system containing both hockey players .
a 90.0 -kg hockey player moves at 5.0 m/s and collides head-on with a 110-kg player moving at 3.0 m/s in the opposite direction. after the collision, they move off together at 1.0 m/s.
Answers
Answer:
c h i c k e n n u g g e t s . . . . . .
jk its 2.6
Energy of a wave is measured in terms of the wave's Choose... .
Answers
The energy of a wave is measured in terms of the wave's amplitude.
What is the energy of a wave?The energy of a wave depends on the amplitude and the frequency of of the wave.
The energy of a wave is directly proportional to the square of the wave's amplitude.
Mathematically, the formula for energy of a wave is given as;
E = ¹/₂μω²A²
where;
μ is the mass per unit length of the stringω is the angular velocity of the waveA is the amplitude of the waveE is the energy of the waveSo based on the formula given above, energy of a wave is proportional to the square of wave's amplitude and square of angular frequency of the wave.
Thus, we can conclude that the energy of a wave is measured in terms of the wave's amplitude because the energy of the wave is function of maximum displacement of the wave (wave amplitude).
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It is now 9:11 a.m. but when the bell rings at 9:12 a.m. Susie will be late for Mrs. Garner's U.S. History class for the 3rd time this week. She must get from one side of the school to the other by hurrying down three different hallways. She runs down the first hallway (D-Hall), a distance of 47.0 meters. The second hallway (C-Hall) is filled with students, and she covers its 63.0 m length quickly. The final hallway (B- Hall) is empty, and Susie sprints its 76.0 m length. How fast does Susie need to go to make it to class on time (Hint: Calculate the total distance. Then calculate her total average speed rounded to the nearest tenths in meters/seconds.)?
Answers
Answer:
3.1 m/s
Explanation:
The total distance she has to run is the addition of the three lengths:
47 + 63 + 76 = 186 meters.
She needs to cover it one minute (60 seconds). Therefore her speed must be:
186 m / 60 s = 3.1 m/s
what happen to kinetic energy of a body if it speed is doubled
Answers
Answer:
The energy possessed by a body because of its motion, equal to one half the mass of the body times the square of its speed is called its kinetic energy. Hence, when velocity is doubled, kinetic energy becomes 4 times.
Explanation:
if net force acting on object is 0 then the force is considered to be balanced; unbalanced forces; how does gravity affect balanced/unbalanced forces; what is a balanced force; unbalanced force examples; if the forces in an object are unbalanced the net force is; 5 examples of balanced and unbalanced forces; if the forces in an object are balanced the net force is
Answers
Only when a single force is acting on an object without being counterbalanced by another force of equal strength can it be said to be acting on it in an imbalanced manner.
Do the forces balance or are they out of balance when the net force is zero?The forces acting on an item are known as balanced forces when the net force exerted on the object is zero. An object's state of rest or uniform motion remains constant when the forces operating on it are in balance.
When the forces acting on an object are balanced, the net force is 0 and the object's motion is unaffected.If and only if the object is subject to a net force of zero, an object's velocity (a vector) remains constant. In other words, if an object experiences no net force, neither its speed nor its direction of motion will change (including if it is at rest).
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Item 2
An object is transported to three different planets in the solar system.
Which statement is true about that object?
The object’s mass and weight stay the same.
The object’s mass changes, but its weight stays the same.
The object’s mass and weight both change.
The object’s weight changes, but its mass stays the same.
Answers
Answer:
the object's weight changes but its mass stays the same
Answer:
the object's weight changes but its mass stays the same
Explanation:
100% correct
Approximately how many times louder is a 150-dB sound than a 80-dB sound?
Answers
a 150-dB sound is approximately 10 million times louder than an 80-dB sound.
What is the range of sound?Provide instances of the differences between the audible, ultrasonic, and infrasonic frequency ranges. Three sorts of sound waves, each covering a distinct frequency range, are used. These are what they are:
Waves that fall inside the ear's sensitivity range are referred to be audible waves.Infrasonic waves are those whose frequencies fall below the range of human hearing. Ultrasonic waves are those with frequencies higher than those of sound.The difference in decibels between two sounds is related to the ratio of their intensities (or power) by the following formula:
dB₂ - dB₁ = 10 log10(I₂ / I₁)
where dB₁ and dB₂ are the decibel levels of the two sounds, and I₁ and I₂ are their intensities (or power).
Using this formula, we can find the ratio of the intensity of a 150-dB sound to that of an 80-dB sound:
150 dB - 80 dB = 10 log10(I₁₅₀ / I₈₀)
70 = 10 log10(I₁₅₀ / I₈₀)
7 = log10(I₁₅₀ / I₈₀)
10^7 = I₁₅₀ / I₈₀
I₁₅₀ = 10^7 * I₈₀
This shows that the intensity of a 150-dB sound is 10 million times greater than that of an 80-dB sound.
Therefore, a 150-dB sound is approximately 10 million times louder than an 80-dB sound.
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Alex wants to be able to do 10 push-ups on his next PE assessment next week. This
would be an example of a
goal.
Answers
I feel like it is short term, also it isnt simple
What is density????????????
Answers
Density is a measure of mass per volume.
The average density of an object equals its total mass divided by its total volume.
An object made from a comparatively dense material (such as iron) will have less volume than an object of equal mass made from some less dense substance (such as water).
Perhaps the highest density known is reached in neutron star matter.
The singularity at the centre of a black hole, according to general relativity, does not have any volume, so its density is undefined.
6. The rate at which velocity changes is called
O speed
O direction
O acceleration
O displacement
Answers
1. The kinetic energy of a car is 8 106 J as it travels along a horizontal road. How much work is required to stop the car in 10 s? (A) zero joules (B) 8 105 J (C) 8 107 J (D)8 104 J (E) 8 106 J
Answers
The power to stop the car with kinetic energy of a car is \(8*10^{6} J\) as it travels along a horizontal road is \(8*10^{5} watt\), option B
What is Kinetic energy ?Kinetic energy can be seen as one that is been recorded when an object is able to move from a place , in a broad term we can say this is the energy that can be attributed to that of someone leaving a place and go to another place hence we can see it as the one in the motion.
The definition of energy as the "power to accomplish work" refers to the capacity to apply a force that moves an object. Even if the word is vague, it is clear what energy actually means: it is the force that causes objects to move. The two types can be attributed to the one we know which are kinetic and potential energy.
\(Power \frac{Energy}{time}\)
\(Energy = 8*10^{6} J\)
\(time = 10 s\)
\(Power = \frac{8*10^{6} J}{10}\)
\(power = 8*10^{5} watt\)
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proper question;
The kinetic energy of a car is 8 × 106 J as it travels along a horizontal road. How much power is required to stop the car in 10 s? (A) zero joules (B) 8 105 J (C) 8 107 J (D)8 104 J (E) 8 106 J
The earth has a vertical electric field at the surface,pointing down, that averages 102 N/C. This field is maintained by various atmosphericprocesses, including lightning.
What is the excess charge on the surface of the earth? inC
Answers
Answer:
\(q = -461532.5 \ C\)
Explanation:
From the question we are told that
The electric filed is \(E = 102 \ N/C\)
Generally according to Gauss law
=> \(E A = \frac{q}{\epsilon_o }\)
Given that the electric field is pointing downward , the equation become
\(- E A = \frac{q}{\epsilon_o }\)
Here \(q\) is the excess charge on the surface of the earth
\(A\) is the surface area of the of the earth which is mathematically represented as
\(A = 4\pi r^2\)
Where r is the radius of the earth which has a value \(r = 6.3781*10^6 m\)
substituting values
\(A = 4 * 3.142 * (6.3781*10^6 \ m)^2\)
\(A =5.1128 *10^{14} \ m^2\)
So
\(q = -E * A * \epsilon _o\)
Here \(\epsilon_o\) s the permitivity of free space with value
\(\epsilon_o = 8.85*10^{-12} \ m^{-3} \cdot kg^{-1}\cdot s^4 \cdot A^2\)
substituting values
\(q = -102 * 5.1128 *10^{14} * 8.85 *10^{-12}\)
\(q = -461532.5 \ C\)
Highschool Physics
1. The driver of a car traveling at 9.0m/s is honking their horn. The horn has a frequency of 625 Hz. If the car is moving toward a person waiting at the crosswalk, what frequency of the horn does the person hear?
2. As the same car from question#1 passes the person, what frequency of the horn does the person hear as the car moves away from them?
Answers
Using the formula for the Doppler effect:
f' = (v + vr) / (v + vs) * f
Given:
Source frequency (horn): f = 625 Hz
Speed of sound: v = 343 m/s (approximate value at room temperature)
The velocity of the receiver, vr, is zero because the person waiting at the crosswalk is stationary.
The velocity of the source, vs, is the speed of the car, which is given as 9.0 m/s.
Thus:
f' = (v + vr) / (v + vs) * f
= (343 m/s + 0) / (343 m/s + 9.0 m/s) * 625 Hz
= (343 m/s) / (352 m/s) * 625 Hz
≈ 609 Hz
Therefore, the person waiting at the crosswalk hears a frequency of approximately 609 Hz.
(2)Using the same Doppler effect formula:
f' = (v - vr) / (v - vs) * f
In this case, the velocity of the receiver, vr, is still zero because the person remains stationary.
The velocity of the source, vs, is now negative, indicating that the car is moving away from the person.
Thus:
f' = (v - vr) / (v - vs) * f
= (343 m/s + 0) / (343 m/s - (-9.0 m/s)) * 625 Hz
= (343 m/s) / (352 m/s) * 625 Hz
≈ 609 Hz
In other words, as the car moves away from the person, they would still hear a frequency of approximately 609 Hz.
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Which is one piece of information that "9” gives about an atom of fluorine?
the atomic number
the atomic mass
the mass of neutrons
the number of neutrons
Answers
The piece of information that "9” gives about an atom of fluorine is that it is the atomic number (option A).
What is atomic number?Atomic number is the number of protons in an atom with the symbol Z. The atomic number is the basis of arrangement of atoms on the periodic table.
Fluorine is a chemical element that has an atomic number of 9. It is the lightest of the halogens, a pale yellow-green, highly reactive gas that attacks all metals.
The atomic number is the number of protons in the nucleus of an atom, which is always equal to the number of electrons in a neutral atom.
Therefore, it can be said that "9" symbolises the atomic number of the element, fluorine.
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We can model the human back as a pivoted rod?
Answers
Answer:
So the answer is yes, we can the back be shaped like a spinning rod
spinal column that is approximated by a long and narrow rod,
Explanation:
The bone system of the body is very well modeled in physics, the back has a spinal column that is approximated by a long and narrow rod, this rod is fixed in the lower part to the coccyx and has a weight in the upper part (head), this rod has longitudinal vertical movement and twisting movement around the lower part of the bar.
So the answer is yes, we can the back be shaped like a spinning rod
At what speed will a box be falling at a time t = 0.75 s after being dropped?
Answers
Explanation:
Initial speed(u)= 0 m/s (Ball is dropped)
time(t)= 0.75 s
acceleration(a)= 10 m/s² (gravity)
Final speed(v)= u+at
v=0+(10)× 0.75
v=7.5 m/s
Speed is 7.5 m/s
please help! help! help!.. Two metal spheres of the material and of equal radius R are touching each other .show the force of attraction between them is proportional to
\(r {4}\)
Answers
Answer:
F ∞ r^4
Explanation:
I can't really write the equation here because its complex
Hope this helps:)
a fan is rotating clockwise and its acceleration has a positive sign. is the angular velocity of the fan speeding up, slowing down, or constant?
Answers
Answer:
The angular velocity is slowing down.
Explanation:
By convention, if a rigid body is rotating clockwise, the angular velocity is negative.If the angular acceleration has a positive sign, since the angular acceleration and the angular velocity have opposite signs, this means that the angular velocity is slowing down.A rate law for which the units of rate are equal to the units of the rate constant is the zero order kinetics?
A. True
B. False
Answers
Answer: b
Explanation:
What causes wind? A. differences in land elevation on a continent B. the angle at which the rays from the sun hit the atmosphere C. air flowing from a high pressure area to a low pressure area D. gravity pull caused by the moon moving farther away from the earth
Answers
Answer:
C
Explanation:
I think it C because I learnt about it in geography and my teacher approves. Maybe
ighth grade F.1 Identify reactants and products MGX
This passage describes a chemical reaction. Read the passage. Then, answer the question
below.
The cheesemaking process sometimes includes a step called lactic acid fermentation.
This step occurs when a certain type of bacteria is added to milk. The bacteria form
lactic acid (C3H603) by combining water (H₂O) and lactose (C12H22011) in the milk.
When lactic acid forms, the milk's proteins clump into curds that can later be used to
make many types of cheese.
In the chemical reaction described in the passage, which of the following are reactants?
Select all that apply.
water (H₂O)
lactose (C12H22011)
Submit
lactic acid (C3H603)
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Get 5
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Answers
What’s the acceleration of a car that goes from 32 m/a to 96 m/s in 8.0 s
Answers
Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt. This is:
a = Δv / Δt
a = (96 m/s - 32 m/s) / (8.0 s)
a = 64 m/s / 8 s
a = 8 m/s²