A boxcar of mass 125 tons at rest becomes uncoupled on a 2.0° grade. If the track is considered to be frictionless, what speed does the boxcar have after 9.0 seconds?A. 4.0 m/sB. 0.038 m/sC. 31 m/sD. 3.1 m/sE. 0.31 m/s

Answer:

x = 5[km]

Explanation:

We must convert the time from minutes to hours.

\(t=30[min]*\frac{1h}{60min}= 0.5[h]\\\)

We know that speed is defined as the relationship between space and time.

\(v=x/t\)

where:

x = space [m]

t = time = 0.5 [h]

v = velocity [m/s]

Now replacing:

\(x = 10[\frac{km}{h} ]*0.5[h]\\x=5[km]\)

The minimum uncertainty in an electron's velocity is δmin,e ≈ 2.24×10⁶ m/s.

The Heisenberg uncertainty principle states that there is a fundamental limit to the precision with which certain pairs of physical properties, such as position and velocity, can be known simultaneously.

The uncertainty in an electron's velocity can be calculated using the formula Δv ≥ h/(4πmΔx), where Δv is the minimum uncertainty in velocity, h is the Planck's constant, m is the mass of the electron, and Δx is the uncertainty in position.

Given that Δx is known within 1.4 nm (or 1.4×10⁻⁹ m) for the electron, we can substitute these values into the formula:

Δv ≥ (6.63 × 10⁻³⁴ J·s) / (4π × 9.11 × 10⁻³¹ kg × 1.4 × 10⁻⁹ m)

Δv ≥ 2.24 × 10⁶ m/s

Therefore, the minimum uncertainty in an electron's velocity is approximately 2.24×10⁶ m/s.

The Heisenberg uncertainty principle is a fundamental concept in quantum mechanics that describes the limitations in simultaneously measuring certain pairs of physical properties with precision. In this context, the uncertainty in an electron's velocity is determined by the uncertainty in its position.

The uncertainty principle quantifies this relationship and provides a lower bound on the minimum uncertainty in velocity. The uncertainty in position and velocity arises due to the wave-particle duality of matter, where particles such as electrons can exhibit both wave-like and particle-like behaviors.

Understanding the uncertainty principle is crucial in quantum mechanics, as it underlies the probabilistic nature of quantum phenomena and has implications for the behavior and properties of subatomic particles.

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The deceleration experienced by the 1075 N sky diver as he opened his parachute is 13.39 m/s²

Force = mass × acceleration

We know that deceleration is the acceleration of stopping objects. Thus,

Force (F) = mass (m) × deceleration (a)

Thus, we can obtain the deceleration of the sky diver as follow:

Force = mass (m) × deceleration (a)

1469 = 109.69 × a

Divide both sides by 109.69

a = 1469 / 109.69

a = 13.39 m/s²

Thus, the deceleration is 13.39 m/s²

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collisions of particles with the inside walls of the tire cause the pressure that is exerted by the enclosed gas. because of the increasing the number of air particles increases the number of collisions, which then increased the pressure of the tire.

Answer:B

Explanation: Just did it

Answer:

I think top. of a mountain

Answer: You would weigh very slightly more at sea level than at the top of a mountain, not enough for you to notice, but a measurable amount. Weight, which really means gravitational force, is proportional to the product of the masses of two objects acting on each other, in this case the giant earth and the minuscule you.

Explanation:

The magnitude of the electric field can be found using the formula E = F/q Where E is the electric field, F is the force exerted on the charge, and q is the magnitude of the charge. Plugging in the given values, we get Therefore, the magnitude of the electric field is 22.86 x 10^3 N/C.

The find the direction of the electric field, we need to use the concept of the direction of the force experienced by the charge. Since the force is directed upwards, we know that the electric field must be directed downwards to cause an upward force on the negative charge. Therefore, the direction of the electric field is downwards. In summary, the magnitude of the electric field is 22.86 x 10^3 N/C and the direction is downward to find the magnitude and direction of the electric field that exerts a force on a charge, we can use the following formula Electric field (E) = Force (F) / Charge (q) Force (F) = 4.00 × 10^ (-5) N (upward) Charge (q) = -1.75 µC = -1.75 × 10^(-6) C  Calculate the electric field magnitude E = F / q E = (4.00 × 10^ (-5) N) / (-1.75 × 10^ (-6) C) E ≈ 22,857 N/C Determine the direction Since the charge is negative, the electric field's direction is opposite to the force's direction. The force is acting upward, so the electric field's direction is downward. In conclusion, the magnitude of the electric field is approximately 22,857 N/C, and its direction is downward.

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Cocaine is considered a stimulant drug because it tends to increase overall levels of neural activity. This drug stimulates the central nervous system, leading to increased energy, alertness, and elevated mood. It is a potent and addictive drug that is derived from the leaves of the coca plant.

Cocaine works by blocking the reuptake of dopamine, norepinephrine, and serotonin, which are neurotransmitters that are responsible for regulating mood and behavior. When these neurotransmitters are released, they produce feelings of pleasure and reward. Cocaine use can lead to tolerance, dependence, and addiction, as well as a range of negative health effects such as heart attack, stroke, and respiratory failure.

In conclusion, Cocaine is considered a stimulant drug because it tends to increase overall levels of neural activity.

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The image of the truck formed by the rear-view mirror is smaller and virtual, located in front of the mirror.

To calculate the size of the image relative to the size of the truck formed by the rear-view mirror, we can use the mirror equation:1/f = 1/u + 1/v,

where f is the focal length (radius of curvature) of the mirror, u is the object distance, and v is the image distance.

Given that the radius of curvature of the mirror is 4m and the truck is located 5m from the mirror, we can determine the object distance:

u = -5m (since the object is behind the mirror and its distance is negative)

Substituting these values into the mirror equation, we get:

1/4 = 1/(-5) + 1/v

Simplifying the equation:

1/v = 1/4 + 1/5

1/v = (5 + 4) / (4 * 5)

1/v = 9/20

v = 20/9

Now, we can calculate the size of the image relative to the size of the truck using the magnification formula:

magnification = -v/u

Substituting the values:

magnification = -(20/9) / (-5)

magnification = 4/9

Therefore, the size of the image relative to the size of the truck is 4/9. This means the image formed by the rear-view mirror is smaller than the actual truck.

As for the position and nature of the image, since the image distance (v) is positive, the image is formed on the same side of the mirror as the object. In this case, it means the image is formed in front of the rear-view mirror. The positive image distance also indicates that the image is virtual.

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The interference pattern that you you see on the interior surface of the cylinder is (a) bright and dark fringes so closely spaced as to be indistinguishable

Young's double slit experiment is the experiment performed in 1801 by Thomas Young to prove that light is a wave.

Since you are performing Young's double-slit experiment with the slit separation slightly smaller than the wavelength of the light and as a screen, you use a large half-cylinder with its axis along the midline between the slits.

Now, we know that the interference pattern of a Young's double slit experiment is as a result of diffraction.

Interference pattern is the pattern observed due to the vectorial combination of waves

Diffraction is the property of a wave in which a wave spreads out as it passes through an opening.

Now, we know that diffraction occurs when a wave goes through an aperture or opening smaller than its wavelength.

Now, the smaller the opening compared to the wavelength of the wave, the more the diffraction you would observe bright and dark fringes so closely spaced as to be indistinguishable.

So, the interference pattern that you you see on the interior surface of the cylinder is (a) bright and dark fringes so closely spaced as to be indistinguishable

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• The only force acting on the ball, and thus the net force, is due to its own weight, with magnitude

w = m g = (0.4 kg) (9.8 m/s²) ≈ 3.9 N

pointing downward.

• The ball is in free fall, so its acceleration is g = 9.8 m/s² (also pointing downward).

• The ball is dropped from a height of 49 m, so its height y at time t is

y = 49 m - 1/2 g t ²

Set y = 0 and solve for t :

0 = 49 m - 1/2 g t ²

t ² = (98 m) / g

t = √((98 m) / g) = √(10) s ≈ 3.2 s

• The ball's velocity v at time t is

v = - g t

so that at the time found previously, the ball will have attained a velocity of

v = - g (3.2 s) ≈ -31 m/s

and thus a speed of about 31 m/s.

According to recent readings, the time-honored wedding tradition of shabka has been deemed overrated. Shabka is a traditional wedding practice that originated in certain regions and cultures.

However, in recent times, there has been a growing sentiment that shabka has become overrated. Shabka typically involves the groom presenting a significant amount of money or valuable gifts to the bride's family as a demonstration of his commitment and ability to provide for her. While the practice was historically rooted in cultural and social norms, evolving attitudes and societal changes have led to a reevaluation of its significance.

One of the main reasons behind shabka being considered overrated is the changing dynamics of relationships and marriage. In many societies, the emphasis on financial transactions and material displays as proof of love and commitment is seen as outdated and superficial. Modern relationships often prioritize emotional connection, mutual respect, and shared values rather than monetary exchanges. Additionally, the rising awareness of gender equality has challenged the notion that a woman's worth can be measured by the amount of money or gifts her future husband can offer.

Furthermore, the economic factor plays a role in considering shabka overrated. With economic uncertainties and financial constraints affecting many individuals and families, the emphasis on extravagant displays of wealth during weddings can be seen as unnecessary and burdensome. Couples and their families may prioritize practical considerations and focus on building a solid foundation for their future rather than engaging in lavish displays of wealth solely for the sake of tradition.

While shabka may still hold significance in some cultures and for certain individuals, the overall perception of this tradition as overrated suggests a shift in societal values and priorities towards more meaningful aspects of relationships and marriages.

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Answer:

pe=mgh

Explanation:

hope this helped

Answer:

Option (b).

Explanation:

A star is a heavenly body which emits a tremendous amount of energy by the reaction of nuclear fusion.

Sun is the smallest star in the universe.

The star stars from the proto star, this is the process of birth of a star. Then it collapse due to the gravitational pull and then it tarts emit light and energy and become a star.

After the long long time, it starts to decay and become a neutron star or the black hole.

So, the correct option is (b).

At an equal time interval, acceleration increases with increase in velocity and it will maintain a positive value. When this value is compared to -9.8 m/s² (acceleration due to gravity), the value obtained will be greater than the value of acceleration due to gravity.

Generally, acceleration is defined as the change in velocity per change in time of motion.

Acceleration of an object at any given time, t, can be calculated using the following equations below;

\(a = \frac{\Delta v}{\Delta t} = \frac{v-u}{t_2-t_1}\)

where;

From the formula above, we can conclude that at an equal time interval, acceleration increases with increase in velocity and it will maintain a positive value. When this value is compared to -9.8 m/s² (acceleration due to gravity), the value obtained will be greater than the value of acceleration due to gravity.

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Answer:

t an equal time interval, acceleration increases with increase in velocity and it will maintain a positive value. When this value is compared to -9.8 m/s² (acceleration due to gravity), the value obtained will be greater than the value of acceleration due to gravity.

Generally, acceleration is defined as the change in velocity per change in time of motion.

Acceleration of an object at any given time, t, can be calculated using the following equations below;

Explanation:

Answer:

The balloon moves back to the sweater.

Explanation:

Answer:

The balloon moves back to the sweater.

Explanation:

plato:)

The four gas laws are a set of equations that describe how gases behave under different conditions. These laws are based on the fundamental idea that gases are made up of atoms or molecules that are in constant motion, and that these atoms or molecules interact with each other and with the walls of the container in which they are confined. The four gas laws are:

The Ideal Gas Law: PV = nRT

The Ideal Gas Law is an equation that relates the pressure (P), volume (V), and temperature (T) of a gas to the number of moles (n) of the gas present. The constant R is the ideal gas constant, which has a different value for each unit of pressure, volume, and temperature.

Boyle's Law: P1V1 = P2V2

Boyle's Law states that the pressure and volume of a gas are inversely proportional to each other at constant temperature. This means that if the volume of a gas decreases, the pressure will increase, and vice versa.

Charles' Law: V1/T1 = V2/T2

Charles' Law states that the volume and temperature of a gas are directly proportional to each other at constant pressure. This means that if the temperature of a gas increases, the volume will also increase, and vice versa.

Gay-Lussac's Law: P1/T1 = P2/T2

Gay-Lussac's Law states that the pressure and temperature of a gas are directly proportional to each other at constant volume. This means that if the temperature of a gas increases, the pressure will also increase, and vice versa.

The Ideal Gas Law, Boyle's Law, Charles' Law, and Gay-Lussac's Law are all interrelated, and they all contribute to our understanding of how gases behave under different conditions. These laws have many practical applications, such as in the design of engines and the study of atmospheric gases.

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The work done in stretching the spring from its natural length to 7 inches beyond its natural length is 112.5 ft-lb.

We are given a spring which is stretched beyond its natural length by 2 inches, by applying a force of 10 pounds.

We have to calculate the work done in stretching it further to 7 inches beyond its natural length, in ft-lb.

In order to calculate the work done, we need to know the spring constant (k) of the spring and then use the formula for work done by a spring, which is given by

W = (1/2)k(x2² - x1²)

Where, W is the work done, k is the spring constant, x1 is the initial position of the spring, and x2 is the final position of the spring.So, we need to find the spring constant k of the spring, in order to calculate the work done.Let the spring constant be k lb/inch.

We know that F = kx

where, F is the force applied, x is the displacement, and k is the spring constant.

Substituting the values, we get10 = k(2)k = 5 lb/inch.

Now, we can use the formula for work done, which is W = (1/2)k(x2² - x1²)

Substituting the values, we get W = (1/2)(5)(7² - 2²)W = (1/2)(5)(45)W = 112.5 ft-lb.

Therefore, the work done in stretching the spring from its natural length to 7 inches beyond its natural length is 112.5 ft-lb.

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Physics is the branch of science that deals with the structure of matter and how the fundamental constituents of the universe interact. It studies objects ranging from the very small using quantum mechanics to the entire universe using general relativity.

Answer:

please ask this question separately

Explanation:

The coefficient of friction between the soap and the tub is 0.1.

The coefficient of static friction is the ratio of the maximum static friction force between the surfaces in contact before movement commences to the normal force.

Mathematically, the coefficient of static friction is given as;

μ = F/N

where;

Before an object start moving, the static friction must be overcame since it resists the motion of the object.

The normal force on the soap is the vertical downward force on the soap applied by Alan, N = 500 N

The force of friction on the soap, F = 50 N

μ = F/N

μ = 50 / 500

μ =  0.1

Thus, the coefficient of friction increases with increase in the horizontal force of friction and decrease in the normal force on the object.

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Answer: that Christians should not withdraw from the world, but should actively participate in the ... That is perhaps the reason why there is currently such an ... Investigating the root causes and consequences of corruption may contribute to a more.

Explanation:

Explanation:

The car's rate of change of position is decreasing. The car is moving but its rate of position increase is coming down. The car will eventually come to a brief stop and begin traveling backward.

Renewable energy

Advantages :-

1. Easily regenerate

2. Boost economic growth

3. Easily available

4. Support environment

5. Low maintenance cost

Disadvantages :-

1. Weather dependency

2. High installation cost

3. Noise caused by wind energy

4. Fluctuation problem (solar)

5. Intermittency issue (wind)

Non-renewable energy

Advantages :-

1. Concentrated energy source

2. Reliable energy source

3. Can be built anywhere

4. No radioactive waste

Disadvantages :-

1. Produces greenhouse gases

2. Contributes to global warming

3. Produces acid rain

4. Harmful to environment when they are burnt

I hope this helps.....

Total surface area = 3/2 * area of an old radiator.

Solution:

K = \(\frac{Qd}{A*changeinT}\)

change in T =  ΔT  

Therefore New Area  ( A ) = 3/2 * area of the old radiator.

If you need faster cooling rates, replacing the rubber hoses with silicone hoses is one option. These can withstand higher heat, are less likely to break over time, and last longer. Apart from that, you can also upgrade the radiator fan and shroud to help with cooling. The radiator is an important component of the engine's cooling system.

Its main role is to spread the antifreeze/water mixture around the fins, letting off some of the engine's heat while drawing in the cool air before it passes through the rest of the engine. Replacing your home's radiator has a variety of benefits, and many properties will benefit from this.

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Answer:

Explanation:

The new volume can be found by using the formula for Boyle's law which is

\(P_1V_1 = P_2V_2\)

Since we are finding the new volume

\(V_2 = \frac{P_1V_1}{P_2} \\\)

From the question we have

\(V_2 = \frac{35000 \times 80}{92000} = \frac{2800000}{92000} = \frac{700}{23} \\ = 30.434782...\)

We have the final answer as

Hope this helps you

24 v across a 1,000 ohm resistor the current equals to 24 mA using ohm's law.

To find the current flowing through a 1,000 ohm resistor with 24 volts across it, you can use Ohm's Law, which states:

Calculate an electric circuit's voltage, resistance, and current. In order to maintain the required voltage drop across the electric components, ohm's law is also applied.

I (the amount of current flowing through a conductor) = V (the potential difference applied to the ends) divided by R (resistance) is the formula for Ohm's law.
Current (I) = Voltage (V) / Resistance (R)
In this case, Voltage (V) = 24 volts and Resistance (R) = 1,000 ohms. Plugging in these values:
Current (I) = 24 V / 1,000 ohms = 0.024 A (Amperes)
So, the current flowing through the 1,000 ohm resistor is 0.024 A or 24 mA (milliamperes).

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