A 132 g piece of nickel is heated to 100.0 °c in a boiling water bath and then dropped into a beaker containing 877 g of water (density = 1.00 g/cm3) at 5.0 °c. what was the final temperature of the nickel and water after thermal equilibrium was reached

The answer is D I took the test

This question is just so simple. All we have to do to get the wavelength is to divide the length by the number of waves.

Wavelength = 20 cm / 80 waves

Wavelength = 0.25 cm / wave = 0.25 cm

Or if in meters, Wavelength = 2.5 x 10^-3 m

Answer:

The two are still synchronized but run slow

Explanation:

Time flows at a different rate for an object that is moving. The time of the object which is moving is running slower than an object which is stationary. Here, Albert is stationary so time will flow faster for him and for Henry who is moving time will flow slower. This phenomenon is called time dilation

[tex]\Delta t'=\frac{\Delta t}{\sqrt{1-\frac{v^2}{c^2}}}[/tex]

Where,

Δt is the time elapsed for the person who is moving

Δt' is the time elapsed for the person who is stationary

c = Speed of light = 3×10⁸ m/s

v = Velocity of the object which is moving

Answer: D

Explanation:  

The two are still synchronized but run slow.

Answer : (B) it decreased by 1/4

Explanation :

It is given that :

The distance between twin satellites that were originally 150 meters apart are now 300 meters apart.

When the satellites are 150 m apart then the gravitational force is :

[tex]F=G\dfrac{m_1m_2}{(150\ m) ^2}[/tex]..........(1)

Similarly, when the satellites are 300 m apart then the gravitational force is :

[tex]F'=G\dfrac{m_1m_2}{(300\ m) ^2}[/tex]...........(2)

From eq (1) and (2)

[tex]\dfrac{F_c}{F_c'}=4[/tex]

[tex]F_c'=\dfrac{F_c}{4}[/tex]

So, the gravitational force between the twin satellites is decreased by 1/4.

Hence, the correct option is (b).

Answer:

B: it decreased by 1/4

Explanation:

Riding in a vehicle with a lap belt and a separate shoulder belt provides significant protection in car accidents. The lap belt secures the lower body while the shoulder belt secures the upper body.

If you are riding in a vehicle equipped with a lap belt and also a separate shoulder belt, you are using one of the most effective safety measures for passenger vehicles. These belts, when used together, greatly reduce the chance of serious injury or death in a car accident. The lap belt secures your lower body, preventing you from sliding forward or sideways, while the shoulder belt protects your upper body, preventing you from being ejected from the vehicle or hitting the interior elements during a collision.

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ACC is an Autonomous cruise control or adaptive cruise control is a system for road vehicles that automatically adjusts the vehicle speed (can increase or decrease the speed) to maintain a safe distance from vehicles ahead. 

There are also many other names of Autonomous cruise control such as active cruise control, intelligent cruise control, or radar cruise control. 

Answer:

Option C integrity.

Step-By-Step Explanation:

The best attribute for an office professional to have is Integrity

Because if you are following integrity you will be in ethical manner whoever say anything to you.Your mind will not make you to lose your values which is the most important thing in anybody's life.

If you do not have integrity you may lose and you lose your temper you will get quite or pretty much aggressive and you may get fired.

In lead acid battery, chemical reactions are induced to do work on charge and produce a voltage difference between the two output terminals.

In a lead storage battery, the negative terminal is composed of lead electrode (Pb2+) while in the positive terminal it is composed of lead dioxide electrode (PbO2).

The chemical half reactions in each electrode are:

Negative Terminal: Pb2+  +  SO4(2-) ---> PbSO4 + 2e

            Lead electrode is oxidized to supply electrons.

Positive Terminal: PbO2 + H2SO4 + e ---> PbSO4

            Lead dioxide electrode is reduced by the addition of electrons.

Answer: Lead dioxide is reduced.

Final answer:

The weight of the landing craft on the surface of Callisto is 3264 N, derived by analyzing the force provided by the craft's engine in two different scenarios according to Newton's second law of motion.

Explanation:

The question involves understanding Newton's second law of motion, which is F = ma, where F is the net force applied to the object, m is the mass of the object, and a is the acceleration.

When the engine provides an upward force (thrust) of 3264 N, the craft descends at a constant speed, implying that the thrust balances out the weight of the craft (weight = gravitational force). Therefore, the net force, F, is zero, and the acceleration is 0 m/[tex]s^{2}[/tex]. When the thrust is only 2203 N, the craft accelerates downward at 0.39 m/[tex]s^{2}[/tex]. To find the weight of the landing craft on Callisto's surface, we can use the given data from the two scenarios.

To solve, let's denote the mass of the landing craft as m, and the acceleration due to gravity on Callisto as g. Thus, the weight of the landing craft, which is the gravitational force, can be expressed as W = mg.

From the second scenario, we have:
F - W = ma
2203 N - mg = m(0.39 m/[tex]s^{2}[/tex])
Since the first scenario tells us that F = W when F is 3264 N, substituting back, we get mg = 3264 N. We therefore find the weight of the landing craft to be 3264 N on the surface of Callisto.

The law of conservation of momentum tells us that momentum is conserved, therefore total initial momentum should be equal to total final momentum. In this case, we can expressed this mathematically as:

mA vA + mB vB = m v

where, m is the mass in kg, v is the velocity in m/s

since m is the total mass, m = mA + mB, we can write the equation as:

mA vA + mB vB = (mA + mB) v

furthermore, car B was at a stop signal therefore vB = 0, hence

mA vA + 0 = (mA + mB) v

1800 (vA) = (1800 + 1500) (7.1 m/s)

vA = 13.02 m/s

Answer:

A, B and C

Explanation:

An object thrown with a speed at some angle near the Earth undergoes a projectile motion. It moves in a curved path under the action of gravity only. The object is known as projectile.  options A, B and C are examples of projectile motion. These objects move under the action of gravity only.

An airplane landing is in control of its motion and does not move just under the action of gravity. So, it cannot be considered as projectile motion.

Answer: The gravitational potential energy of the system increases.

Explanation:

To calculate how far a 68 kg person could walk at 5 km/h based on the energy from an energy bar, you need to know the energy content of the bar. Then, you would estimate the energy expenditure during walking and use that to estimate the distance that person could cover.

Your question refers to energy and distance covered by a person walking at a certain speed, making it a topic of Physics. However, the computation of how far a 68 kg person can walk at 5 km/h, given a certain amount of energy (derived from an energy bar), requires more information.

We would specifically need to know the amount of energy provided by the energy bar. Once we have that, we can dive into understanding that energy consumption during physical activity, like walking, is determined by body mass and speed among other factors.

A common estimation of energy expenditure due to walking is made using the formula 0.1×weight(kg)×distance(km). After obtaining the energy content of the bar, we can rearrange that formula to find the distance: distance = energy/(0.1×weight). With that calculation, you could answer how far the person can walk based on the energy released by the bar.

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To solve this problem, we should remember that the formula for index of refraction is defined as:

n = c / v

or

n v = c

Where,

n = index of refraction

c = speed of light

v = speed of light in the medium

Since speed of light is constant, then we can simply equate the materials 1 and 2:

n1 v1 = n2 v2

Where the speed of light in the medium (v) can be expressed as:

v = w * f

Where,

w = wavelength of light

f = frequency of light

Therefore substituting this back into the relating equation:

n1  w1 f1 = n1  w2 f1

Since it is given that the light is monochromatic, w1 = w2, this further simplifies the equation to:

n1 f1 = n2 f2

f1 / f2 = n2 / n1                  (ANSWER)

The ratio of the frequency of light in two different materials can be found using their refractive indices and the equation n1*f1 = n2*f2.

The ratio of the frequency of light in two different materials is determined by their refractive indices.

In physics, the frequency of light can be related to the speed of light in different media using the index of refraction.

The equation n1*f1 = n2*f2 expresses the relationship between the frequencies of light in material 1 and material 2.

The ratio of frequencies f1/f2 of monochromatic light when moving from one material to another is 1, because the frequency of light remains constant across different media.

The student asks about the ratio of the frequencies f1 and f2 of monochromatic light going from one material with index of refraction n1 to another with index of refraction n2. This question pertains to the physics concept of refraction and properties of light as it travels through different media. The frequency of light does not change when it passes from one medium to another, as frequency is an intrinsic property of the wave that is independent of the medium. Therefore, the ratio of the frequencies f1/f2 is equal to 1, or f1=f2.

The dark-colored rock pocket mice on dark lava flows have white bellies, as there is no selection for dark bellies by visual predators.

Natural selection is the process of choosing an animal with specific traits for the next generation.

A genetic mutation that alters their hue caused this to happen. This is a consequence of natural selection in turn. Those with advantageous qualities are decided by nature to survive and procreate.

The procedure that improves an organism's chances of surviving is called a mutation. A dark belly can be advantageous for reproduction. White bellies are crucial for camouflaging.

Therefore, due to the lack of selection for dark bellies by visual predators, the dark-colored rock pocket mice on black lava flows have white bellies.

To learn more about natural selection, refer to the below link:

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The solar eclipse is compared to the 1969 moon landing due to their significance in space and discovery, despite the time gap. Both events captivated the public and demonstrated advancements in technology and our understanding of the universe.

NASA scientist Madhulika Guhathakurta compared the solar eclipse to the 1969 moon landing because both events were significant in terms of space and discovery, despite occurring nearly 50 years apart. The moon landing was a historic achievement in human space exploration, and the solar eclipse, while not a human accomplishment, is a rare celestial event that offers valuable scientific insights. Both events captivated the public and showcased the advancements in technology and our understanding of the universe.

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Answer:

I believe I know your answer choices, the answer would be finding ways to use energy

Explanation:

In chemistry we have a way to store the power, we use batteries to store this energy, so it can’t be this. We also have a way to produce it consistently, using wind power and solar panels. We currently are making strides to conserve energy, by sharing consumptions graphs with others. Chemistry is all about finding the use for it! There possibilities never end, which makes this goal, and more importantly, the answer.

About one-third of the toxic metal, mercury (Hg), is released into the air from natural sources, such as rocks, soil, volcanoes, and the ocean. the remaining two-thirds comes from human activities.

Mercury is the 80th element in periodic table. It is a heavy metal but exists as liquid in room temperature. Mercury is a transition metal having wide applications in various industries.

Mercury is toxic in nature and reported to be dangerous to human health, even causes death by concentric exposure. Global mercury contamination is a result of human activities including mining and the burning of fossil fuels.

Mercury that is released into the air eventually sinks into the ground or is washed into the water. Once deposited, specific microbes can transform it into methylmercury, a very poisonous form that accumulates in fish, shellfish, and animals that consume fish.

To find more on mercury contamination, refer here:

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