If a light wave moves from water into seawater in which direction will the bend?

Many astronomers were skeptical about Percival Lowell's claims of Martian canals for several reasons.

First and foremost, the technological limitations of the time made it difficult to obtain clear and detailed observations of Mars. The telescopes available in Lowell's era were not powerful enough to discern fine surface details on the planet, leading to potential misinterpretations.

Furthermore, other astronomers failed to reproduce Lowell's observations and saw no evidence of the linear features he described as canals. They argued that the perceived canals could be optical illusions or artifacts resulting from poor atmospheric conditions or the limitations of the telescopes used.Additionally, advances in understanding Mars and its geology, particularly through space missions and improved telescopes, have provided a wealth of evidence contrary to Lowell's claims. Modern investigations have revealed that Mars does not possess an extensive network of artificial canals but instead exhibits natural features such as valleys, craters, and ancient riverbeds, which can be misinterpreted if not carefully analyzed.Consequently, due to these factors, skepticism prevailed among many astronomers regarding Percival Lowell's claims of Martian canals, and subsequent scientific advancements have provided a more accurate understanding of the Red Planet's surface features.

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When a conductor has a sharp edge or point, the electric field surrounding it becomes extremely concentrated, which can cause corona discharge.

Corona discharge happens when the electric field surrounding a conductor surpasses a particular threshold, ionising the air molecules and producing a conductive route for the electric current. This can cause energy to be released in the form of light, heat, and noise, as well as the formation of ozone.

Corona discharge may cause a variety of issues with high-voltage devices. It can result in energy loss, conductor surface degradation, and the generation of undesired electromagnetic interference. It can also raise the likelihood of electrical failure, which can lead to equipment failure and safety issues.

To avoid these concerns, conductors used in high-voltage equipment are engineered to have smooth, rounded edges that lower the concentration of the electric field and prevent corona discharge from happening.

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The body's acceleration when the velocity is zero can be found by evaluating the derivative of the velocity-time graph at those points. The acceleration at each instance when the velocity is zero will give the body's instantaneous acceleration at that particular moment.

When the velocity of a body is zero, it means that the body is momentarily at rest. In such cases, we can analyze the body's motion by examining its velocity-time graph.

The points on the graph where the velocity is zero correspond to the instances when the body changes its direction of motion or comes to a temporary halt.

To find the body's acceleration at those instances, we need to calculate the derivative of the velocity-time function. The derivative gives us the rate of change of velocity with respect to time, which represents acceleration.

By evaluating the derivative at the points where the velocity is zero, we can determine the body's acceleration at those specific moments.

It's important to note that the body's acceleration when the velocity is zero can vary depending on the shape of the velocity-time graph and the specific behavior of the body's motion.

The acceleration may be positive if the body is decelerating, negative if it's accelerating in the opposite direction, or zero if the body maintains a constant velocity.

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Answer:

When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.

Explanation:

An atom has an equal quantity of positive and negative electric charges (the protons and electrons) when its electron and proton counts are equal (the protons). Since the atom has a total electric charge of zero, it is referred regarded as being neutral.

The atom is the smallest unit of matter that may be divided without resulting in electrically charged particles. Additionally, it is the tiniest substance with features like chemical elements. The atom is therefore the basic building block of chemistry.

Examine different electron arrangements in the electron shells that surround an atom's nucleus.

Examine different electron arrangements in the electron shells that surround an atom's nucleus. The rest is made up of a cloud of negatively charged electrons surrounding a positively charged nucleus made up of protons and neutrons. Compared to electrons, which are the lightest charged particles in nature, the nucleus is small and dense.

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Answer:

The liquid turns to a gas.

Explanation:

If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid. Particles in the middle of the liquid form bubbles of gas in the liquid.

First, find the weight of the object.

W = m g = 900 x 9.8 = 8,820 N

T2x = -t2 cos 20

t1 x = t1cos 40

mgx= 0

T2y= t2 sin 20

t1y= t1 sin 40

mgy= - mg

X and y components of resultant (R)

Rx = t1x -t2x + mgx

Rx= -t2 cos 20 + t1cos 40 (3)

Ry = t2 sin 20 + t1 sin 40 - mg(2)

Rx, and Ry = 0

0 = -t2 cos 20 + t1cos 40 (3)

0= t2 sin 20 + t1 sin 40 - mg (4)

Solve (3)

0 = -t2 cos 20 + t1cos 40

t2 cos 20 = t1 cos 40

t2 = t1 cos40/cos20

t2 = 0.815 t1

Substitute t2 in 4

0 = t2 sin 20 + t1 sin 40 - mg

0 = (0.815 t1) sin 20 + t1 sin 40 - 8,820

0= t1 ( 0.815 sin 20 + sin 40 ) -8820

0 = 0.921 t1 -8820

8820 = .921 t1

t1 = 8820/0.921

t1= 9570.261N (option D)

Answer:

Explanation:  v = v₀ + gt = 0 + 9.80665 * 8 = 78.45 m/s

The final velocity of the airplane is 75.1 m/s.

Velocity can be defined as the measurement of rate and direction of motion.

The velocity of a moving object changes with time. Thus, a moving object will have an initial velocity as well as a final velocity.

The formula for final velocity, V is given by the formula below:

v = √(u² + 2as)

where

The values are as follows:

u = 25.88 m/s

a = 4.21 m/s²

s = 590.39 m

Substituting the values

v = √{(25.88)² + 2 * 4.21 * 590.39)}

v = 75.1 m/s

Therefore, the final velocity, v is 75.1 m/s

In conclusion, the final velocity of the airplane is derived from the initial velocity, acceleration, and distance of travel.

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Answer:

Explanation:

\(m =800kg\\v = 15\\\\K.E = \frac{1}{2}mv^2\\ K.E= \frac{1}{2} \times 800\times 15^2\\= 400 \times 225\\= 90000 joules\\= 90 kilojoules\)

The conservation laws are very important to understand about the physical world. Because they describe which processes can or cannot occur in nature.

In physics, a conservation law states that a particular measurable property of an isolated system does not change as the system evolves over time. The four important conservation laws are conservation of mass and energy, conservation of linear momentum, conservation of angular momentum and conservation of electric charge.

The energy and mass can neither be created nor be destroyed, but can be transformed from one form to another form. This is called Law of conservation of mass and energy. The total momentum of a system remains constant according to law of conservation of linear momentum.

When no external torque acts on an object, no change of angular momentum occur according to law of conservation of  angular momentum. The total amount of electric charge in a closed system remain constant according to law of conservation of electric charge.

Your question is incomplete most probably your full question was:

What are the four conservation laws in physics?

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Answer:

is a force that attracts any two objects with a mass

Answer:

Explanation:

The mass of the object can be found by using the formula

\(m = \frac{2KE}{ {v}^{2} } \\ \)

v is the velocity

KE is the kinetic energy

From the question we have

\(m = \frac{2 \times 100000}{ {20}^{2} } = \frac{200000 }{400} = \frac{2000}{4} \\ \)

We have the final answer as

Hope this helps you

Answer:

Rate of Reaction of B is more.

Explanation:

Rate of reaction  refer to the speed at which product are formed.

A is completed in 57 seconds and reaction B is completed in 48 seconds

therefore reaction b speed is more. Therefore rate of Reaction of B is more.

The correct answer is A. The crowded merry-go-round. The crowded merry-go-round will take longer to stop because it has more mass due to the children riding on it.

This means that there is more inertia to overcome, which requires more time and distance to slow down. While both merry-go-rounds experience the same amount of friction, the heavier one will take longer to come to a complete stop. The additional mass will require more energy to bring it to a stop, taking more time than the empty merry-go-round with less mass. The same amount of friction will be acting on both merry-go-rounds, but the crowded one will require more energy to come to a stop, thus taking more time.

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Gravitational Potential Energy (GPE) = mass(m) * gravity(g) * height(h)Where the mass of the object is m = 1.2 kg, the height it was lifted to is h = 64 cm = 0.64

The gravitational potential energy of a 1.2 kg textbook increases by 7.39 J when lifted upwards by 64 cm.

The formula used to calculate the gravitational potential energy is given by: Gravitational Potential Energy (GPE) = mass(m) * gravity(g) * height(h)Where the mass of the object is m = 1.2 kg, the height it was lifted to is h = 64 cm = 0.64 m, and the gravity constant is g = 9.8 m/s².Substituting the given values, we have;

GPE = 1.2 kg × 9.8 m/s² × 0.64 m= 7.39 J

Therefore, the gravitational potential energy of a 1.2 kg textbook increases by 7.39 J when lifted upwards by 64 cm.

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Answer:negative slope or gradient I think

Explanation:

Answer:

15 N

Explanation:

f=ma

f=1.5*10

f=15 N

Answer:

q = 0.384 C

Explanation:

The total charge present at the head can be easily found out by multiplying the charge on a single electron with the total number of electrons present on the head:

\(q = ne\)

where,

q = total charge on head = ?

n = total no. of electrons on the head = 2.4 x 10¹⁸

e = charge on 1 electron = 1.6 x 10⁻¹⁹ C

Therefore,

\(q = (2.4\ x\ 10^{18})(1.6\ x\ 10^{-19}\ C)\)

q = 0.384 C

Answer:

a. The total momentum of the trolleys which are at rest before the separation is zero

b. The total momentum of the trolleys after separation is zero

c. The momentum of the 2 kg trolley after separation is 12 kg·m/s

d. The momentum of the 3 kg trolley is -12 kg·m/s

e. The velocity of the 3 kg trolley = -4 m/s

Explanation:

a. The total momentum of the trolleys which are at rest before the separation is zero

b. By the principle of the conservation of linear momentum, the total momentum of the trolleys after separation = The total momentum of the trolleys before separation = 0

c. The momentum of the 2 kg trolley after separation = Mass × Velocity = 2 kg × 6 m/s = 12 kg·m/s

d. Given that the total momentum of the trolleys after separation is zero, the momentum of the 3 kg trolley is equal and opposite to the momentum of the 2 kg trolley = -12 kg·m/s

e. The momentum of the 3 kg trolley = Mass of the 3 kg Trolley × Velocity of the 3 kg trolley

∴ The momentum of the 3 kg trolley = 3 kg × Velocity of the 3 kg trolley = -12 kg·m/s

The velocity of the 3 kg trolley = -12 kg·m/s/(3 kg) = -4 m/s

a-The total momentum of the trolleys before separation=0

b.The total momentum of the trolleys after  separation=0

c. The momentum of 2kg trolley after  separation=12kg-m/sec

d. The momentum of 3kg trolley after separation=-12kg-m/sec

e. The velocity of the 3kg trolley=4kg-m/sec

Given-

Trolley A with mass= 2kg

Trolly B with mass= 3kg

Velocity of trolly A =6m/sec

A- Total momentum of the trolleys before separation-

Here, in this problem both the trolleys are in the rest position hence the momentum of both trolleys = 0

B- Total momentum of the trolleys after  separation-

We know that motion never changes in an isolated collection of objects,

hence the momentum of the trolleys before and after the separation=0

C- Momentum of the Trolley A (2kg)-

It is known that momentum= Mass x Velocity

\(P=m\times v\)

\(P=2\times 6\)

\(P=12\)

Hence, the momentum of the 2kg trolley is 12 kg-m/sec

D- Momentum of the Trolley B (3kg)-

As we know that  motion never changes in an isolated collection of an object hence the total moment of after saparation = 0

hance the momentum of the trolley B will be equal and opposite to the momentum of trolley A=

\(P= -12\)

Momentum of trolley B (3kg) is -12kg-m/sec

E- The velocity of the 3kg trolley-

The momentum of trolley A= Momentum of trolley B

\(m_{b} v_{a} =m_{b} v_{a}\)

\(-2\times 6=3\times v_{a}\)

\(v_{a}=-4\)

The value of the velocity of the 3kg trolley is -4m/sec

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Answer:

A Gap is the space between

Answer: distance, a gap

Explanation:

Answer:

True

Explanation:

The earth is divided into huge slabs called tectonic plates.

Answer:

Explanation:

l etme y lo saoc apr aotarsy  r dealkten dpo

Answer:

INERTIA

Explanation:

Answer: 1*10^3 mm^3

That’s it

Answer:

Into sound and heat energy due to friction.

The correct option for maximizing contrast is 70 kV and 15 mAs. A film with maximum contrast requires a new technique that involves the reduction of kV and mAs parameters. The new technique should be 70 kV and 15 mAs.

Radiography is a technique that enables the creation of medical images of the human body, using an X-ray beam. X-rays are an example of ionizing radiation, and their interaction with the tissues in the body results in the formation of an image. Contrast is the difference in tone between adjacent areas in the image, and it is essential to obtain high contrast in radiography, to ensure the visualization of the structures of interest and to make it possible to detect abnormalities.

Maximizing contrast is a common technique used in radiography, and it involves the adjustment of parameters such as kV, mAs, and exposure time. A high-contrast image can be achieved by reducing kV and mAs and increasing exposure time. The kV and mAs settings are the most important variables to adjust to enhance contrast. A high-kV setting will result in a low-contrast image, while a low-kV setting will produce a high-contrast image.In the given scenario, the original technique is 80 kV and 20 mAs, and all other factors are equal. To enhance the contrast, the new technique should be a combination of reduced kV and mAs. The possible options for a new technique are:

70 kV and 15 mAs70 kV and 30 mAs80 kV and 15 mAs60 kV and 60 mAs

The best option for maximizing contrast is the first option, which is 70 kV and 15 mAs. This is because the kV value has been reduced by 10, and the mAs has been reduced by 5, which will result in an increase in contrast.

The new technique to enhance contrast requires a reduction in kV and m As parameters, and the best option for maximizing contrast is 70 kV and 15 mAs.

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Answer:

n physics, the kinetic energy (KE) of an object is the energy that it possesses due to its motion.[1] It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest.

In classical mechanics, the kinetic energy of a non-rotating object of mass m traveling at a speed v is {\displaystyle {\begin{smallmatrix}{\frac {1}{2}}mv^{2}\end{smallmatrix}}}{\begin{smallmatrix}{\frac {1}{2}}mv^{2}\end{smallmatrix}}. In relativistic mechanics, this is a good approximation only when v is much less than the speed of light.

The standard unit of kinetic energy is the joule, while the imperial unit of kinetic energy is the foot-pound.

Explanation:

Answer:

kinetic energy is the energy that an object posses due to their motions.

Explanation:

eg:When you let go of that ball and let it fall, the potential energy converts into kinetic energy, or the energy associated with motion. There are five types of kinetic energy: radiant, thermal, sound, electrical and mechanical.

Answer:

14:30:00

Explanation:

because the speed of propagation of seismic waves is at 500

If Two forces F1 and F2 are acting a body the angle between them is Q.

assuming the F₁ is acting along x-axis. then the resultant force is

F = √(F₁²+F₂²+2F₁F₂cosθ)

The term "resultant force" describes the total force exerted on an item after all of its separate forces have been taken into account. It represents the vector sum of all forces while accounting for their strengths and directions.

The resulting force is zero and the item remains in an equilibrium condition if the forces acting on it are equal and balanced. However, Newton's second equation of motion (F = ma) states that an imbalanced resultant force accelerates the object in the direction of the resultant force.

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