Một chất điểm chuyển động có phương trình chuyển là : x=10+25t (km;h)
a) Hãy xác định vị trí vật ở thời điểm ban đầu, vận tốc của vật
b) Hãy xác định vị trí của chất điểm đi được sau 3 giờ

Those under probation following a DUI conviction may not be able to enter a business that C. serves alcohol.

Driving while intoxicated (DUI) is the crime of operating a vehicle while under the influence of alcohol or other substances (including prescription medications and recreational drugs) to the point where it is unsafe for the driver to do so.  The offence goes under many different names in different jurisdictions.

Even if the person accused is not actually driving the car, the criminal violation may generally include being physically "in control" of a car while under the influence of alcohol.

For instance, DUI charges may be brought against those who are discovered holding the car keys while intoxicated in the driver's seat of a parked vehicle.

DUI probationary criteria can vary based on the situation, but frequently include things like:

Avoiding alcohol and drugs, and abiding by the law, completion of a substance abuse assessment and suggestions for treatment.

Regular drug and alcohol testing, attendance at AA meetings, and using an ignition interlock device (IID) in your car are all required.

The judge may also order ongoing drug and alcohol monitoring utilising tools like SCRAM (secure continuous remote alcohol monitoring) bracelets or drug patches to make sure the offender doesn't use drugs or alcohol while on DUI probation.

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Answer:

14.4m

Explanation:

u = 0 i.e it started from rest

acceleration (a) = 3.2m/s2

time taken (t) = 3.0s

Using the second equation of motion:

s = ut + 1/2at2

s = 0(3.0) + 1/2(3.2)(3.0)2

s = 1.6(9.0)

s = 14.4m

hence the distance covered within that time is 14.4m.

The radioactive half-life is given by:

Where:

Answer:

A

Explanation:

Trust me the math checks out I just did it

It IS NOT C

The change in velocity of the center of mass of the three-block system

is Fext/6mΔt. Option A is correct.

The change of displacement with respect to time is defined as the velocity.

velocity is a vector quantity. it is a time-based component. Velocity

at any angle is resolved to get its component of x and y-

direction.

The given data in the problem is;

The sum of all the masses is 6m.

\(\rm F_{ext}\) is the force exerted to the left on the rightmost block

Δt is the time interval

is the change in the velocity

From Newton's second law, The change in the velocity is

\(\rm I = \triangle P \\\\ F \triangle t =m \triangle v \\\\ F_{ext} \triangle t =6m \triangle v \\\\ \triangle v = \frac{ F_{ext} }{6m} \triangle t\)

The change in velocity of the center of mass of the three-block system

is Fext/6mΔt.

Hence option A is correct.

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Based on the given informations, the orbital period of the outer edges of the primordial disk was calculated to be approximately 1515 years.

Assuming that the mass of Neptune is 17 times that of the Earth and that the distance of Neptune from the Sun is about 30 astronomical units (AU), we can use Kepler's third law of planetary motion to solve for the period of the outer edges of the primordial disk.

Using the equation P² = (4π²/GM) x a³, where P is the period, G is the gravitational constant, M is the mass of the Sun, and a is the semi-major axis of the orbit, we can rearrange the equation to solve for P:

P = sqrt((4π²/GM) x a³)

Since the matter that made up the planetesimals was spread out evenly on the edges of the primordial disk, we can assume that the semi-major axis of their orbit was about 35.5 AU (the radius of the disk).

Plugging in the values, we get:

P = sqrt((4π²/6.6743 x 10⁻¹¹ x 1.9885 x 10³⁰) x (35.5 x 1.496 x 10¹¹)³)

P = 1515 years (approx.)

Therefore, the orbital period of the outer edges of the primordial disk was approximately 1515 years.

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The average velocity of the object over the given intervals can be calculated using the position function s(t) = \(-18t^{2}\) + 54t. The average velocities are as follows: (a) -144, (b) -126, (c) -108, and (d) -18h + 36.

The average velocity of an object can be found by calculating the change in position divided by the change in time. In this case, we are given the position function s(t) = \(-18t^{2}\) + 54t.

(a) For the interval [1,10], the change in time is 10 - 1 = 9. To find the change in position, we evaluate s(10) - s(1):

s(10) = \(-18(10)^{2}\) + 54(10) = -1800 + 540 = -1260

s(1) = \(-18(1)^{2}\) + 54(1) = -18 + 54 = 36

Change in position = -1260 - 36 = -1296

Average velocity = Change in position / Change in time = -1296 / 9 = -144.

(b) For the interval [1,9], the change in time is 9 - 1 = 8. To find the change in position, we evaluate s(9) - s(1):

s(9) = -18(9)^2 + 54(9) = -1458 + 486 = -972

Change in position = -972 - 36 = -1008

Average velocity = Change in position / Change in time = -1008 / 8 = -126.

(c) For the interval [1,8], the change in time is 8 - 1 = 7. To find the change in position, we evaluate s(8) - s(1):

s(8) = \(-18(8)^{2}\) + 54(8) = -1152 + 432 = -720

Change in position = -720 - 36 = -756

Average velocity = Change in position / Change in time = -756 / 7 = -108.

(d) For the interval [1,1+h], the change in time is (1+h) - 1 = h. To find the change in position, we evaluate s(1+h) - s(1):

s(1+h) = \(-18(1+h)^{2}\) + 54(1+h) = -18(1 + 2h + h^2) + 54(1 + h) = -18 - 36h - \(18h^{2}\) + 54 + 54h = 36h - \(18h^{2}\) + 36

s(1) = \(-18(1)^{2}\) + 54(1) = -18 + 54 = 36

Change in position = (36h - \(18h^{2}\) + 36) - 36 = 36h - \(18h^{2}\)

Average velocity = Change in position / Change in time = (36h - \(18h^{2}\)) / h = 36 - 18h.

Therefore, the average velocities for the given intervals are (a) -144, (b) -126, (c) -108, and (d) 36 - 18h.

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1) when we light a matchstick,the energy which got consumed in while rubbing the matchstick against the surface,turns into heat and hence ,it lights , therefore,the energy gets transferred from one type to another which proves the law of conservation of energy.

2) The coal gets burn and generate into electricity which further used by us for various purposes like lighting lamp and since the energy gets transferred from one source to another instead of ceasing, it proves the statement of conservation of energy.

3) As the pendulum swings in air , it continues to move from one point to another, changing potential energy to kinetic energy due to the motion that's taking place and unless an external force interferes, it's speed won't increase as at some point due to the friction by air will resist the movement resulting in decresement of kinetic energy and increased potential energy, thus ,at some point it will come to rest .

4) No ,it doesn't , because due to the force of friction,the disturbance in the movement of it ,takes place, making it stop at a specific point after some time.

5) As the pendulum swings in air , it continues to move from one point to another, changing potential energy to kinetic energy due to the motion that's taking place and unless an external force interferes, it's speed won't increase as at some point due to the friction by air will resist the movement resulting in decresement of kinetic energy and increased potential energy, thus ,at some point it will eventually come to rest .

6)

7)

8) In the previous problem ,the kinetic energy increases as continues rolling and the potential energy decreases in this process of prolongation of the movement ,while ,when an object comes to rest after the process of moving or falling, it's potential energy is at the highest while the kinetic energy is just the opposite .

9)

10)

11)

In perfectly elastic collision, there's no loss of energy, hence ,the energy that got used up in the starting to bounce the ball ,will remain the same throughout the whole collision and the height would be the same 6 meters and kinteic energy would be 117.6J

Answer:

Explanation:

The work done by an object can be found by using the formula

From the question

force = 1,000 N

distance = 20 m

We have

workdone = 1000 × 20

We have the final answer as

Hope this helps you

Answer:

Quantum mechanics is the science of the very-small things. It explains the behavior of matter and its interactions with energy on the scale of atomic and subatomic particles. By contrast, classical physics explains matter and energy only on a scale familiar to human experience, including the behavior of astronomical bodies such as the Moon. Classical physics is still used in much of modern science and technology. However, towards the end of the 19th century, scientists discovered phenomena in both the large (macro) and the small (micro) worlds that classical physics could not explain. The desire to resolve inconsistencies between observed phenomena and classical theory led to two major revolutions in physics that created a shift in the original scientific paradigm: the theory of relativity and the development of quantum mechanics. This article describes how physicists discovered the limitations of classical physics and developed the main concepts of the quantum theory that replaced it in the early decades of the 20th century. It describes these concepts in roughly the order in which they were first discovered. For a more complete history of the subject, see History of quantum mechanics. Light behaves in some aspects like particles and in other aspects like waves. Matter—the "stuff" of the universe consisting of particles such as electrons and atoms—exhibits wavelike behavior too. Some light sources, such as neon lights, give off only certain specific frequencies of light, a small set of distinct pure colors determined by neon's atomic structure. Quantum mechanics shows that light, along with all other forms of electromagnetic radiation, comes in discrete units, called photons, and predicts its spectral energies (corresponding to pure colors), and the intensities of its light beams. A single photon is a quantum, or smallest observable particle, of the electromagnetic field. A partial photon is never experimentally observed. More broadly, quantum mechanics shows that many properties of objects, such as position, speed, and angular momentum, that appeared continuous in the zoomed-out view of classical mechanics, turn out to be (in the very tiny, zoomed-in scale of quantum mechanics) quantized. Such properties of elementary particles are required to take on one of a set of small, discrete allowable values, and since the gap between these values is also small, the discontinuities are only apparent at very tiny (atomic) scales. Many aspects of quantum mechanics are counterintuitive and can seem paradoxical because they describe behavior quite different from that seen at larger scales. In the words of quantum physicist Richard Feynman, quantum mechanics deals with "nature as She is—absurd".  For example, the uncertainty principle of quantum mechanics means that the more closely one pins down one measurement (such as the position of a particle), the less accurate another complementary measurement pertaining to the same particle (such as its speed) must become.  Another example is entanglement, in which a measurement of any two-valued state of a particle (such as light polarized up or down) made on either of two "entangled" particles that are very far apart causes a subsequent measurement on the other particle to always be the other of the two values (such as polarized in the opposite direction).  A final example is superfluidity, in which a container of liquid helium, cooled down to near absolute zero in temperature spontaneously flows (slowly) up and over the opening of its container, against the force of gravity.

Explanation:

hope this makes sense and helps :)

Answer:

Quantum mechanics is the science of the very-small things. It explains the behavior of matter and its interactions with energy on the scale of atomic and subatomic particles. By contrast, classical physics explains matter and energy only on a scale familiar to human experience, including the behavior of astronomical bodies such as the Moon. Classical physics is still used in much of modern science and technology. However, towards the end of the 19th century, scientists discovered phenomena in both the large (macro) and the small (micro) worlds that classical physics could not explain. The desire to resolve inconsistencies between observed phenomena and classical theory led to two major revolutions in physics that created a shift in the original scientific paradigm: the theory of relativity and the development of quantum mechanics. This article describes how physicists discovered the limitations of classical physics and developed the main concepts of the quantum theory that replaced it in the early decades of the 20th century. It describes these concepts in roughly the order in which they were first discovered. For a more complete history of the subject, see History of quantum mechanics. Light behaves in some aspects like particles and in other aspects like waves. Matter—the "stuff" of the universe consisting of particles such as electrons and atoms—exhibits wavelike behavior too. Some light sources, such as neon lights, give off only certain specific frequencies of light, a small set of distinct pure colors determined by neon's atomic structure. Quantum mechanics shows that light, along with all other forms of electromagnetic radiation, comes in discrete units, called photons, and predicts its spectral energies (corresponding to pure colors), and the intensities of its light beams. A single photon is a quantum, or smallest observable particle, of the electromagnetic field. A partial photon is never experimentally observed. More broadly, quantum mechanics shows that many properties of objects, such as position, speed, and angular momentum, that appeared continuous in the zoomed-out view of classical mechanics, turn out to be (in the very tiny, zoomed-in scale of quantum mechanics) quantized. Such properties of elementary particles are required to take on one of a set of small, discrete allowable values, and since the gap between these values is also small, the discontinuities are only apparent at very tiny (atomic) scales. Many aspects of quantum mechanics are counterintuitive and can seem paradoxical because they describe behavior quite different from that seen at larger scales. In the words of quantum physicist Richard Feynman, quantum mechanics deals with "nature as She is—absurd".  For example, the uncertainty principle of quantum mechanics means that the more closely one pins down one measurement (such as the position of a particle), the less accurate another complementary measurement pertaining to the same particle (such as its speed) must become.  Another example is entanglement, in which a measurement of any two-valued state of a particle (such as light polarized up or down) made on either of two "entangled" particles that are very far apart causes a subsequent measurement on the other particle to always be the other of the two values (such as polarized in the opposite direction).  A final example is superfluidity, in which a container of liquid helium, cooled down to near absolute zero in temperature spontaneously flows (slowly) up and over the opening of its container, against the force of gravity.

Explanation:

if you need anything gust let me know :)

Answer:

they are membrane proteins

a)

i. The force exerted on the piston by the air in the freezer is 240 N.

ii. The work done on the piston by the air as it pushes the piston 0.021 m into the cylinder is 5.04 J.

b) The change in the internal energy of the cylinder is 3486 J.

a)  

i. To calculate the force exerted on the piston by the air in the freezer, we can use the formula:

Force = Pressure * Area

Given:

Pressure (P) = 1.0 × \(10^5\) Pa

Area (A) = 2.4 ×\(10^(^-^3^) m^2\)

Substituting these values into the formula, we have:

Force = (1.0 × 10^5 Pa) * (2.4 ×\(10^(^-^3^) m^2)\)

      = 240 N

ii. To calculate the work done on the piston by the air in the freezer as the air pushes the piston, we can use the formula:

Work = Force * Distance

Given:

Force = 240 N

Distance (d) = 0.021 m

Substituting these values into the formula, we have:

Work = (240 N) * (0.021 m)

     = 5.04 J

b) To calculate the change in the internal energy of the cylinder, we can use the formula:

ΔU = mcΔT

Given:

Initial temperature (T1) = 21°C = 21 + 273 = 294 K

Final temperature (T2) = -18°C = -18 + 273 = 255 K

Thermal capacity (c) = 89 J/°C

Substituting these values into the formula, we have:

ΔU = (89 J/°C) * (294 K - 255 K)

   = 3486 J

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Answer:

Explanation:

The location of the target can be determined by calculating the horizontal distance according to the projectile formula

R = U*√2H/g

U is the initial speed = 20m/s

H is the maximum height = 14m

g is the acceleration due to gravity = 9.81m/s²

Substitute

R = 20*√2(14)/9.81

R = 20√28/9.81

R = 20√2.85

R = 20(1.689)

R = 33.79m

Hence the location of the target is at 33.79m

Answer:

False.

Explanation:

Mass is the amount of matter in a given object. Weight is the force acting on an object due to gravity.

Answer:

False

Explanation:

Weight is the act of pulling an object towards the earth surface so weight is a force to amount

Answer:

we need more info

Explanation:

In conclusion, when two identical springs are joined and a force is applied to their ends, the total distance the joined springs will stretch is twice the distance that one spring would stretch on its own.

When a single spring is pulled on both ends by a force, it stretches a certain distance. If we attach a second identical spring to the end of the first spring and apply the same force to the ends of the joined springs, we can determine the total distance the joined springs will stretch.

Let's assume that the original spring stretches a distance of "x" when the force is applied. Since the second spring is identical, it will also stretch a distance of "x" when the same force is applied.

When the springs are joined, the force applied to one end of the first spring will be transferred to the second spring, causing it to stretch as well. Therefore, the total distance the joined springs will stretch is the sum of the individual stretches of each spring.

So, the total distance the joined springs will stretch is 2x. This means that the joined springs will stretch twice as much as the individual spring would stretch on its own.

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Our atmosphere is transparent to solar radiation, but it traps the energy that causes the greenhouse effect because the solar energy absorbed by Earth is reradiated as longer-wavelength radiation.

The atmosphere is transparent to incoming solar radiation, which is mostly visible light and short-wavelength radiation. However, the Earth absorbs some of this solar radiation and heats up.

The Earth then radiates this heat energy back out to space as longer-wavelength radiation, mostly in the form of infrared radiation. The greenhouse gases in the atmosphere, such as carbon dioxide and water vapor, are able to absorb this longer-wavelength radiation and trap some of the heat energy in the atmosphere, causing the greenhouse effect.

Hence, this is why the atmosphere is transparent to solar radiation but traps the energy that causes the greenhouse effect.

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The focal length of a lens needed by a woman whose near point is 50cm from her eyes is 50cm.

To find the answer, we have to know about the focal length of correcting lens.

                           \(f=\frac{XD}{X-D}\)

                       \(f=\frac{50*25}{50-25} =50cm.\)

Thus, we can conclude that, the focal length of a lens needed by a woman whose near point is 50cm from her eyes is 50cm.

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Answer:

The velocity at impact is 222.2 m/s

Explanation:

The given information are;

The time at which the woman heard the sound of the coin after dropping it into the wishing well = 30 seconds

The average speed of sound in air = 344 m/s

The time in which the dime travel = t₁

The time in which the sound travel = t₂

1/2 × 9.8 × t₁² = 344 × t₂

t₁ + t₂ = 30

4.9·t₁² = 344 × (30 - t₁)

4.9·t₁² + 344·t₁ - 10320 = 0

Which gives -344±

\(t_1 = \dfrac{-344\pm \sqrt{344^{2}-4\times 4.9 \times 10320}}{2\times 4.9}\)

t₁  = 22.676 seconds or -92.9 seconds

Therefore the correct natural time is t₁  = 22.676 seconds

The velocity at impact, v = g×t₁ = 9.8 × 22.676  = 222.2 m/s

The velocity at impact= 222.2 m/s.

Answer:

try the formula v=s/t

v= velocity

s= speed

t=time

Explanation:

Answer:

D.1.4 hours

Explanation:

\(d\ =\ vt\)

\(t\ =\ \frac{d}{v}\)

\(t\ =\ \frac{100}{70}\)

\(t\ =\ 1.42857142857\)

Therefore, the answer is D 1.4 hours

They were discovered by the voyager 2 spacecraft when it flew by Uranus, this were the rings of Uranus discovered. Hence option C is correct.  

When the Voyager 2 spacecraft passed by Uranus in January 1986, it made the discovery of the planet's rings. The response that is right is option C, which states that the Voyager 2 spacecraft found them while passing by Uranus.

Astronomers had assumed that Uranus had no ring system prior to Voyager 2's arrival. However, many thin, black rings around Uranus were discovered by the imaging equipment on board during the spacecraft's near approach to the planet. These rings were called 1986U2R, 6, 5, 4, Alpha, Beta, Eta, Gamma, Delta, Lambda, and Epsilon in order of their discovery.

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A CP air mass remaining stationary over central Canada would not result in the modification of the air mass.

An air mass is a large body of air with the same temperature and moisture content as the surface over which it was created. The characteristics of an air mass are determined by the properties of the area over which it was created. Air masses are designated based on their region of origin.

The air masses are modified as they move away from their source areas by passing over different regions of the earth's surface with contrasting characteristics.

When an air mass moves over an area with a different climate than the air mass's origin, the air mass is modified. The new surface over which it passes alters the air mass's temperature and moisture content. When an air mass is created over an area with contrasting climate characteristics, it is said to be unmodified.

Thus, a CP air mass remaining stationary over central Canada would not result in the modification of the air mass, and therefore it would be unmodified.

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Gravitational potential energy is an energy acquired by an object due to a change in its height when it is present in a gravitational field. It is denoted by P or U. and it its expressed in joule. Gravitational potential energy is given by U = mgh where m is the mass of the object, g is acceleration due to gravity and h is the height.

when we take an object of mass m to a certain height in the field of gravitation, we can say that body has potential energy and we release that body from that height, it falls.

Electric potential energy is the energy that is needed to move a charge against the electric field.

Electric Potential Energy is given by,

\(U_E = k \frac{q_1q_2}{r}\) where k is dielectric constant, q is charge r is the distance.

Electric Potential Energy is the potential energy stored against electric field. it exist around the charged particle.

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Answer:

I'm pretty sure the answer is broken

Explanation:

At the top of the hill, the cars have a great deal of gravitational potential energy, equal to the cars' weight multiplied by the height of the hill. When the cars are released from the chain and begin coasting down the hill, potential energy transforms into kinetic energy until they reach the bottom of the hill.

Answer:

93km/h

Explanation:

because 31multiplied by 2 Is equal to 2

Suppose a parachutist is falling toward the ground, and the downward force of gravity is exactly equal to the upward force of air resistance. In this scenario, the true statement is that the parachutist has reached terminal velocity.

Terminal velocity is the constant speed attained by a freely falling object when the opposing forces of gravity and air resistance become equal. At this point, there is no net force acting on the parachutist, and the acceleration becomes zero. As a result, the parachutist maintains a constant speed during the descent.

When a parachutist initially jumps out of the aircraft, the downward force of gravity exceeds air resistance, and they accelerate towards the ground. As their speed increases, so does the air resistance acting against them. Eventually, these two forces balance each other out, and the parachutist reaches terminal velocity, allowing them to fall at a constant speed until they deploy their parachute to slow down and land safely. The true statement is that the parachutist has reached terminal velocity.

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A sound wave employed in pta has a relatively low pitch when it generates resonance near the basilar membrane's apex.

The correct statement is C.

The pattern of disruption brought about by the movement or energy through a material (such as air, water, or any other solid or liquid matter) as it spreads away from the origin of sound is known as a sound wave. Pressure waves are generated by item vibrations that cause sound waves, such as those from a ringing phone.

Because air compressions and rarefactions create sound waves, they are known as longitudinal waves. Parallel to the propagation direction, the air molecules vibrate.

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