Physics question
two concrete spans of a 180 m long bridge are placed end to end so that no room is allowed for expansion. if the temperature increases by 20◦c, what is the height to which the spans rise when they buckle? assume the thermal coefficient of expansion is 1.2 × 10^−5(◦c)^−1. answer in units of m.

1 meter per second squared is equivalent to 0.001 kilometer per second squared.

To convert 1 meter per second squared (m/s²) into kilometer per second squared (km/s²), we need to consider the conversion factor between meters and kilometers.

1 kilometer is equal to 1000 meters, so we can use this conversion factor to convert the units.

First, let's convert the acceleration from meters per second squared to kilometers per second squared:

1 m/s² = (1/1000) km/s²

Therefore, 1 meter per second squared is equal to 0.001 kilometer per second squared.

So, 1 m/s² = 0.001 km/s².

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The image of a distant tree is virtual and very small when viewed in a curved mirror. the image appears to be 18.0 cm behind the mirror. kind of mirror is a concave mirror.

Based on the information provided, we can determine that the mirror in question is a concave mirror. This is because a concave mirror is curved inward and has a reflective surface that bulges inward, like the inside of a sphere.

Concave mirrors are known for their ability to converge light, meaning that they can bring parallel light rays together at a single point, known as the focal point.
In this case, we know that the image of the distant tree is virtual, meaning that it appears to be behind the mirror, rather than in front of it.

This is a characteristic of concave mirrors, as they can create virtual images when the object being reflected is located within the focal length of the mirror.

Additionally, we know that the image is very small, which is another indication that the mirror is concave.
Finally, we know that the image appears to be 18.0 cm behind the mirror.

This means that the image is located at the focal point of the mirror, which is a common location for virtual images to appear when using a concave mirror.

Overall, based on the information provided, we can confidently conclude that the mirror in question is a concave mirror.

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To maximize the objective function p with the given constraints, we use linear programming by identifying the feasible region.

Finding corner points, evaluating p at each point, and selecting the point with the maximum value of p.In this case, the given constraints are x = 0, y = 0, 2x + 2y = 4, and x + y = 8. To maximize the objective function p, we follow these steps:Identify the feasible region by graphing the constraints on a coordinate plane.

The corner points, which represent the vertices of the feasible region.Evaluate the objective function p at each corner point.Select the point with the maximum value of p as the optimal solution that maximizes p while satisfying the given constraints.

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One of Galileo's famous experiments involved dropping objects of different weights from the Leaning Tower of Pisa to demonstrate that they fell at the same rate in the absence of air resistance, contrary to Aristotle's belief that heavier objects fell faster.

Galileo Galilei was an Italian physicist and astronomer who made significant contributions to the study of motion. At the time, the dominant theory of motion was proposed by Aristotle, who believed that heavier objects fell faster than lighter objects. Galileo performed experiments, including dropping objects of different masses from the Leaning Tower of Pisa, and found that objects of different masses fall at the same rate in the absence of air resistance.

This insight led Galileo to the conclusion that objects fall due to gravity, which acts equally on all objects regardless of their mass. He also discovered the concept of inertia, which states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. Galileo's work was crucial in the development of modern physics and set the stage for the later work of scientists such as Isaac Newton, who developed the laws of motion and universal gravitation based on Galileo's observations and insights.

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Answer:

The kinetic energy is 16 joules.                        

Explanation:

Kinetic energy (E) is given by:

\( E = \frac{1}{2}mv^{2} \)

Where:

m: is the mass

v: is the speed

When the kinetic energy is 4 joules, the speed of the object is:

\( v_{1}^{2} = \frac{2E_{1}}{m} = \frac{8}{m} \)                         

Now, if the speed is increased twice then we have:

\( E_{2} = \frac{1}{2}mv_{2}^{2} = \frac{1}{2}m(2v_{1})^{2} = \frac{1}{2}m[4(\frac{8}{m})] = 16 J \)

Therefore, the kinetic energy is 4 times the initial value.  

I hope it helps you!                                

To determine the minimum speed of an incident electron that could produce a specific emission line, we need to use the expression for relativistic kinetic energy.

The expression for relativistic kinetic energy is given by:

KE = (γ - 1) * mc^2

Where:
KE is the kinetic energy of the electron
γ is the Lorentz factor, which is given by γ = 1 / sqrt(1 - v^2/c^2)
m is the rest mass of the electron
c is the speed of light in a vacuum
v is the velocity of the electron

Since we are looking for the minimum speed, we need to find the velocity (v) that corresponds to a specific energy level.

First, we need to know the rest mass of the electron, which is approximately 9.10938356 x 10^-31 kilograms.

Next, we need to know the emission line that we are considering. Once we have this information, we can determine the energy level associated with that emission line.

Finally, we can substitute the values into the equation and solve for v.

It is important to note that the value of the speed of light in a vacuum is approximately 3 x 10^8 meters per second.

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False. In igneous rocks like granite, S-waves (secondary waves) travel slower than P-waves (primary waves), not faster.

P-waves are compressional waves that can propagate through both solids and liquids, including granite. On the other hand, S-waves are shear waves that can only travel through solids.

Due to the difference in the way they propagate, P-waves have a higher velocity than S-waves in most materials, including igneous rocks.

Therefore, the statement that S-waves travel about 1.7 times faster than P-waves in granite is incorrect. It is the P-waves that typically exhibit higher speeds compared to S-waves in such geological formations.

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The statement "every red dwarf star that ever joined the main sequence is still there today" is false.

Every red dwarf star that joined the main sequence is not still there today. Red dwarf stars are the most common type of star in the universe, and they have relatively long lifespans compared to other types of stars. However, they are not immortal.

Over time, red dwarf stars undergo various stages of stellar evolution. Eventually, they exhaust their hydrogen fuel and transition to different phases, such as expanding into a red giant or shedding their outer layers to become a white dwarf. The exact fate of a red dwarf star depends on its initial mass and other factors.

While red dwarf stars have long lifespans measured in billions or even trillions of years, they do eventually evolve and change. Therefore, it is incorrect to say that every red dwarf star that joined the main sequence is still there today.

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The height of the building is 40.4 m.

The height of the building can be determined using the equation for vertical motion with constant acceleration.

The acceleration due to gravity is -9.8 m/s^2.

The equation for vertical motion with constant acceleration is:

y = v0t + 1/2at^2

where y is the height of the building,

v0 is the initial velocity,

t is the time, and

a is the acceleration.

We are looking for the height of the building, so y is the unknown variable. We know the initial velocity (v0 = 30 m/s), the time (t = 2.0 s), and the acceleration (a = -9.8 m/s^2).

Plugging in the values, we get:

y = 30 m/s * 2.0 s + 1/2 * -9.8 m/s^2 * (2.0 s)^2

= 60.0 m - 19.6 m

= 40.4 m

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In order to accommodate the increased wave speed, guitars have linear strings with variable linear mass densities, a linear density string and a higher density string under the same tension.

There is a formula for speed velocity. is determined by multiplying the mass of the strength by the square of the attention attention force. As a result, this demonstrates that the investment's velocity accelerated toward the square of the linear identity.

What then is becoming increasingly identity? No. They never fell short to cut. In order to answer the issue, the lesser density string will have a higher velocity if it is under the same strain as the advertising industry.

Lower your pace for the higher density strength and the wave speed.

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Answer:

Conduction: Some metalloids, such as silicon and germanium, can act as electrical conductors under the right conditions, thus they are called semi-conductors. Luster: Silicon for example appears lustrous, but is not malleable or ductile (it is brittle - a characteristic of some nonmetals).

Explanation:

The force being exerted is an applied force. When Debbie pushes the first shopping cart, she exerts a friction force on it. This causes the first cart to exert an applied force on the second cart, transferring the force and causing the second cart to move.

The force being exerted in this situation is the applied force of the first shopping cart on the second shopping cart. This is because when Debbie pushes the first cart, it exerts a force on the second cart causing it to move as well.
Debbie applies a friction force on the first cart, which in turn applies an applied force on the second cart. This force is transferred from one cart to the other, causing both to move in the same direction. Therefore, the force being exerted in this situation is the applied force of the first cart on the second cart.

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The dog slowed down and stop because of the high magnitude of friction opposing the motion due to the nature of the grass and dirt.

Friction is a force that opposes motion. It depends on the nature of the surface in contact with the moving object.

Given that a dog sleigh driver prepared for her race. Her sleigh was loaded with equipment, but on snow and ice, the dogs moved the heavy sled with a force of 600 N each. On the snow and ice, the opposing force known as friction is small.

During the race, she came to an area of grass and dirt instead snow. The sled slowed to a stop because of the high magnitude of the opposing force or frictional force due to the nature of the grass and dirt.

Therefore, there is nothing wrong with one of the dogs. One of them is pulling with a net force of less than 600 N because of drastic increase in frictional force due to the nature of grass and dirt.

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The statement that is correct is that all the carbon atoms in the glucose would end up in the palmitic acid. Option C.

In science a model is used for the purpose of explanation. The model could be used to describe what is going on in the reaction system. We can see from the model that there is a combination of the molecule of glucose with the molecule of oxygen in the molecule.

Now, we can see that the bonds in the glucose that are carbon to carbon bonds are broken and then recombined in such a way that they now lead to the formation of the palmitic acid molecule.

By the law of the conservation of mass, the number of atoms of the reactant is equal to the number of atoms in the product. This would play out as we carry out an atom count of the reactants and the products.

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Answer:

Gravity overcomes the hex nut's stationary inertia and moves the nut straight down into the bottle.

Explanation:

Hope this helps.

Have a good night ma´am/sir.

Be safe!

Option A is correct. The resultant quantity is 50m/s to the right.

Vector quantities are quantities that have both magnitude and direction.

From the diagram shown,  we can see that 100m/s vector moves in the positive x-direction, this means that the  of magnitude the vector is +100m/s.

For the vector 50m/s, we can see that it is moving in the negative x-direction, this shows that the magnitude of the 50m/s vector is -50m/s.

Resultant speed = +100 - 50

Resultant speed = +50m/s

Since the resultant speed is a positive value, this mean that the resultant quantity will be moving towards the right.

Hence the correct option will be 50m/s to the right.

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Answer:

D

Explanation:

If two unequal forces act in opposite directions, one larger force must cancel out the smaller force,

leaving the net force to be some number in one direction.

Take for example a game of tug-of-war; there are two  OPPOSITE forces (groups of people) acting on the rope, one force is pulling with a force in the negative direction while the other force is pulling in the positive direction.

If the forces on the rope were unequal, then the stronger force (group) will pull everything in their direction.

The same will happen on two unequal forces of opposite directions acting on a wooden block. Therefore, since the resultant force will have a non-zero magnitude and direction, there will be a change in the block's motion and position.

The ratios for the given angles are:

(a) Ratio = cos(13°)

(b) Ratio = cos(40°)

To determine the ratio of the magnitude of the normal force to the weight of the car, we need to consider the forces acting on the car when it is traveling up a hill inclined at an angle θ above the horizontal.

The weight of the car acts vertically downward and can be represented by the equation W = mg, where m is the mass of the car and g is the acceleration due to gravity.

The normal force acts perpendicular to the surface of the hill and is responsible for supporting the weight of the car. The magnitude of the normal force can be determined using the equation N = mg cos(θ), where θ is the angle of inclination.

Now let's calculate the ratios for the given angles:

(a) θ = 13°:

In this case, the ratio of the magnitude of the normal force (N) to the weight of the car (W) is:

Ratio = N / W = (mg cos(13°)) / (mg) = cos(13°)

(b) θ = 40°:

In this case, the ratio of the magnitude of the normal force (N) to the weight of the car (W) is:

Ratio = N / W = (mg cos(40°)) / (mg) = cos(40°)

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A parallel plate capacitor, electric field, and potential difference. When a dielectric slab is inserted between the plates of the fully charged, disconnected, and isolated capacitor, the true statement about what happens is:

The potential difference between the plates of the capacitor will decrease.


1. The dielectric slab is inserted between the plates of the capacitor.
2. The dielectric material polarizes, creating an electric field opposite to the original electric field between the plates.
3. This results in a decrease in the net electric field between the plates.
4. As the electric field decreases, the potential difference between the plates (V = E * d) also decreases, where V is the potential difference, E is the electric field, and d is the distance between the plates.

Note that the capacitance of the capacitor will increase due to the presence of the dielectric material, but the stored charge and energy in the capacitor will not change since it is disconnected and isolated from the battery.

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Answer:

The force exerted by one source object on another target object always creates another force at the target object that pushes back on the source object with the same ... or His third law states that for every action (force) in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal and opposite force on object A.

Answer:

The people on the bus fall forward because Newton's Law of Inertia states that and object in motion with stay in motion or an object at rest will stay at rest unless acted in by another force. The force of the bus stopping suddenly caused the passengers to fall forward because they were at rest position.

Answer:

KE = KE (incidental) - KE of emitted photons

or KE = h * f - Wf

So   h * f = KE + Wf = 1.2 + 1.88 = 3.08    incident energy

If you double the frequency then h * f = 6.16

KE = 6.16 - 1.2 = 4.96 eV

The main advantage of the scientific method is that it is a systematic and objective way to acquire knowledge. The scientific method is a process for acquiring knowledge that has been used to great success in understanding the physical world. Astrology, on the other hand, is based on subjective interpretations of the positions of the stars and planets.

The scientific method is a process for acquiring knowledge that has been used to great success in understanding the physical world. It is based on the following steps:

1. **Observation:** The scientist observes a phenomenon and asks questions about it.

2. **Hypothesis:** The scientist proposes a hypothesis, or a possible explanation for the phenomenon.

3. **Experimentation:** The scientist designs experiments to test the hypothesis.

4. **Data analysis:** The scientist collects data from the experiments and analyzes it.

5. **Conclusion:** The scientist draws a conclusion about the hypothesis based on the data analysis.

The scientific method is an iterative process, meaning that the scientist may go back and forth between the different steps as needed.

Astrology, on the other hand, is a system of divination that attempts to predict future events by interpreting the positions of the stars and planets. Astrology is not based on the scientific method, and there is no evidence that it is a reliable way to predict the future.

The main advantage of the scientific method is that it is a systematic and objective way to acquire knowledge. The steps of the scientific method are designed to minimize bias and to ensure that the results of the experiments are repeatable. This makes the scientific method a reliable way to learn about the physical world.

Astrology, on the other hand, is based on subjective interpretations of the positions of the stars and planets. There is no scientific evidence to support the claims of astrology, and the results of astrological predictions are not repeatable.

In conclusion, the scientific method is a more reliable way to understand the physical world than astrology. The scientific method is based on a systematic and objective approach to acquiring knowledge, while astrology is based on subjective interpretations of the positions of the stars and planets.

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The carbon-14 can be used to date the hammer suspected to be used in 3400 BC.

Half life is the time taken for a radioactive element to decay to half of its original value.

Thus, we can conclude that the carbon-14 can be used to date the hammer suspected to be used in 3400 BC.

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The specific heat capacity formula is used to determine the quantity of heat required to alter the temperature of a unit mass of a substance by one degree Celsius.

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I agree with the application of such offenses where criminal responsibility is imposed on strict liability offenses because it is needed to protect public welfare, promote safety, and deter potential harm.

Strict liability offenses are those in which liability is imposed without requiring proof of intent or guilty mind. These offenses focus on the act itself rather than the mental state of the offender. The rationale behind strict liability offenses is often rooted in the need to protect public welfare, promote safety, and deter potential harm.

An argument in favor of strict liability offenses is that they ensure accountability for certain actions that pose a significant risk to society, even in the absence of intent or mens rea. By placing the burden on individuals to adhere to certain standards or regulations, strict liability offenses can help prevent accidents, protect public health, and maintain order.

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In order to increase the gain of a common emitter amplifier, we have to reduce the output impedance. This statement is false.

To increase the gain of a common emitter amplifier, it is more common to focus on increasing the input impedance and/or the transconductance of the transistor, rather than specifically reducing the output impedance.

The NMOS transistor certainly operates in the saturation region.

False. The operating region of an NMOS transistor depends on the voltages applied to its terminals. The NMOS transistor can operate in different regions, including the cutoff, triode, and saturation regions. The specific region of operation depends on the voltages applied to the gate, source, and drain terminals of the transistor.

It's important to note that the answers provided above are based on the given options, but the questions could be more accurately answered with additional context or clarification.

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\(h=v_i_yt+\frac{1}{2}gt^2\\ \\h=\frac{1}{2}(9.81m/s^2)(4s)^2\\\)

h = 78.48 m

Answer:

Explanation:

where h is the height of the cliff, g is the acceleration due to gravity, and t is the time it takes for the ball to hit the ground.

where d is the distance traveled, v is the initial horizontal velocity, and t is the time it takes to travel the distance.

Since the ball is projected horizontally, its initial horizontal velocity is constant, and we can assume it is the same as the speed at which it hits the ground. Therefore, we can write:

Substituting in the given values, we get: