_____ alloy panels have replaced ceramic tiles on the space shuttle's
heat shield because they are less prone to cracking.

please help, will mark brainliest if answer turns out to be correct

Answer:

E = 0.965eV

Explanation:

In order to calculate the minimum energy needed to eject the electrons you use the following formula:

\(E=h \nu\)        (1)

h: Planck' constant = 6.626*10^{-34}J.s

v: threshold frequency = 2.47*10^14 s^-1

You replace the values of v and h in the equation (1):

\(E=(6.262*10^{-34}J.s)(2.47*10^{14}s^{-1})=1.54*10^{-19}J\)

In electron volts you obtain:

\(1.54*10^{-19}J*\frac{6.242*10^{18}eV}{1J}=0.965eV\)

The minimum energy needed is 0.965eV

According to research, development is always towards complexity.

The term research has to do with the process that we have to go through to obtain new knowledge or to confirm a piece of information. Let us say that we have some disconnected pieces of evidence that tend to point towards a particular fact, we would need to use the process of research to establish the truth in the research.

Now we can see that there is a movement towards the complexity of organisms at each particular level in the developmental process. We can then conclude that according to research, development is always towards complexity.

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The lead ball will float with about 17% of its volume above the surface of the mercury.

We know that density is defined as mass per unit volume of a substance. The density of a substance is an intrinsic property which can be used to identify a substance.

Given that Lead is less dense that mercury, we know that lead will float on mercury. Since the density of mercury is 13.6 g/cm3 and that of lead is 11.3 g/cm3, lead ball will float with about 17% of its volume above the surface of the mercury.

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Missing parts;

A spherical ball of lead (density 11.3 g/cm3) is placed in a tub of mercury (density 13.6 g/cm3). Which answer best describes the result?

A.The lead ball will float with about 83% of its volume above the surface of the mercury.

B.The lead ball will float with about 17% of its volume above the surface of the mercury.

C.The lead ball will float with its top exactly even with the surface of the mercury.

D.The lead will sink to the bottom of the mercury.

E.none of the above

The man’s resultant velocity is 4m/s in the north-westerly direction.

According to mathematics, the relative velocity is the vector difference between the velocities of two objects. The difference between the velocities of body A and body B determines the relative velocities between them.

The total of an object's component vector velocities is the resulting vector velocity. The sum of the vector forces acting on an object is equal to the scalar product of its mass and acceleration vector.

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A. The acceleration reflected in the data is 38 m/s²

B. The distance traveled by the blood during the period is 0.02 m

Acceleration is defined as the rate of change of velocity with time.

From the question given, we were told the the blood undergoes constant acceleration for 38 m/s².

Thus, we can say that the acceleration reflected in this data is 38 m/s²

The distance traveled by the blood can be obtain as follow:

v² = u² + 2as

1.29² = 0.1² + (2 × 38 × s)

1.6641 = 0.01 + 76s

Collect like terms

76s = 1.6641 - 0.01

76s = 1.6541

Divide both sides by 76

s = 1.6541 / 76

s = 0.02 m

Thus, we can conclude that the distance traveled by the blood during the period is 0.02 m

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The option that best describes light from the sun is it travels in waves with different wavelengths.

The light from the sun travels to Earth and other parts of the solar system as waves. These waves have different wavelengths with all frequencies of Electromagnetic waves. The light is transmitted as Electromagnetic waves such as radio waves, microwaves, infrared waves, visible light, ultraviolet waves, and X-rays.

Option 1 is incorrect because the sun produces waves other than visible light. Option 3 is incorrect because the sun produces all the wavelengths of visible light from purple to red. Option 4 is incorrect because different Electromagnetic waves have different wavelengths.

Therefore, the option that best describes light from the sun is it travels in waves with different wavelengths.

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We can use Coulomb's law to solve the proble:

Now, we can calculate the net force for the y-axis:

Answer:

+ 1.533

Answer:

0.77 m/s^2

Explanation:

Notice that the weight of the 7 kg mass is calculated via:

weight = m * g = 7 * 9.8 N = 68.6 N

Since the tension in the string is larger (74 N), then the elevator is moving upward and the net force on the object is equal to:

74 N - 68.6 N =  5.4 N

Which tells us that the acceleration of the object is:

F = m * a

5.4 N = 7 kg * a

a = 5.4 /7  m/s^2

a = 0.77 m/s^2

and this must be the same as the acceleration of the elevator since object and elevator are moving together.

Answer: false

Explanation: They are measured by cubic ______. ______ is feet, meters, inches, any way to measure

(a)  The work done by the force of gravity from A to B is 4.41 Joules.

(b)  The work done by the force of gravity from B to C is zero.

(c) The work done by the force of gravity from A to C is 4.41 Joules.

a) To calculate the work done by the force of gravity from A to B, we need to consider the change in potential energy. The potential energy at point A is maximum due to the maximum angle of 35.0∘ to the left of vertical, while at point B, the string is vertical, and the potential energy is zero.

The change in potential energy (ΔPE) is given by:

ΔPE = m * g * h

where m is the mass of the sphere (0.500 kg), g is the acceleration due to gravity (9.8 m/s^2), and h is the change in height.

Since the potential energy at point A is maximum, the change in height is equal to the length of the string (0.900 m).

ΔPE = 0.500 kg * 9.8 m/s^2 * 0.900 m = 4.41 J

Therefore, the work done by the force of gravity from A to B is 4.41 Joules.

b) From B to C, the change in height is zero since the string is already vertical. Hence, the work done by the force of gravity from B to C is zero.

c) The total work done by the force of gravity from A to C is the sum of the work done from A to B and from B to C.

Total work = Work from A to B + Work from B to C = 4.41 J + 0 J = 4.41 J

Therefore, the work done by the force of gravity from A to C is 4.41 Joules.

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I think it is the question:

A Pendulum Is Made Up Of A Small Sphere Of Mass 0.500 Kg Attached To A String Of Length 0.900 M. The Sphere Is Swinging Back And Forth Between Point A, Where The String Is At The Maximum Angle Of 35.0∘ To The Left Of Vertical, And Point C, Where The String Is At The Maximum Angle Of 35.0∘ To The Right Of Vertical. The String Is Vertical When The Sphere Is At

A pendulum is made up of a small sphere of mass 0.500 kg attached to a string of length 0.900 m. The sphere is swinging back and forth between point A, where the string is at the maximum angle of 35.0∘ to the left of vertical, and point C, where the string is at the maximum angle of 35.0∘ to the right of vertical. The string is vertical when the sphere is at point B.

a) Calculate how much work the force of gravity does on the sphere from A to B.

b) Calculate how much work the force of gravity does on the sphere from B to C.

c) Calculate how much work the force of gravity does on the sphere from A to C.

Explanation:

First find current inorder to get guantity of

charge, current =volts /resistance

After getting current ( I) we take the formula which say current =quantity of charge / unit of time

Because the weight of the helium gas is less than the weight of the air it has displaced from the volume of the balloon, the helium-filled balloon rises in the atmosphere.

Chemical element helium has the atomic number 2 and the symbol He. It is the first member of the noble gas group in the periodic table and is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas. Its melting point at ordinary pressure is zero, and its boiling point is the lowest of all the elements.

Helium is most commonly used to fill balloons for celebrations and parades since it is a secure, non-flammable gas. Helium, however, is an essential component in numerous industries, including as national security, high-tech manufacturing, medical technology, and scientific research.

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Diving seabirds need to account for the bending of light because water has a higher refractive index than air.

When light passes through the air-water interface, it slows down and changes direction, causing the image of an object to appear distorted. This phenomenon is known as refraction. For diving seabirds, the refraction of light can make it challenging to accurately locate their prey when diving, which is essential for their survival.

To account for the bending of light, diving seabirds have evolved specialized eyes that allow them to adjust their focus and perceive images differently than humans. These adaptations enable the birds to see through the distorted image caused by refraction and accurately locate their prey while diving. One adaptation that diving seabirds have is a flattened cornea, which allows them to maintain a sharp focus while diving.

Overall, the ability of diving seabirds to account for the bending of light is essential for their survival, as it enables them to accurately locate and catch their prey while diving in the often murky and challenging conditions of the ocean.

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Answer:

football

Explanation:

it is played on zig-zay way/form

Answer:

2.couple’s figure skating

Explanation:

couple’s figure skating

Answer:

Mechanical Energy.

Explanation:

This can occur as either kinetic or potential energy.

Answer:

\(Impulse = 8.0Ns\)

Explanation:

Given

\(Force = 80.0N\)

\(Mass = 0.25kg\)

\(Time = 0.10s\)

Required

Determine the impulse

The impulse is calculated as follows:

\(Impulse = Force * Time\)

Substitute values for Force and Time

\(Impulse = 80.0N * 0.10s\)

\(Impulse = 8.0Ns\)

Hence, the impulse experienced is 8.0Ns

Mia is conducting an experiment to investigate the relationship between the height of a ramp and the distance the toy car rolls. By rolling the car down two ramps, one higher than the other, she can compare the results and determine if the height of the ramp affects the distance the car rolls.

The quantity or size of displacement between two places is defined as distance. It is important to note that the distance between two points is not the same as the distance traveled between them. The total length of the path traveled between two points is referred to as the distance traveled. Travel distance is not a vector.

Here,

This experiment is an example of a controlled experiment, as Mia is manipulating one variable (the height of the ramp) while keeping all other variables constant. By comparing the results of the two trials, she can draw conclusions about the effect of the height of the ramp on the distance the car rolls. It is important for Mia to record her observations and measurements accurately, as well as to repeat the experiment several times to ensure the validity of her results.

This will help her to make a reliable conclusion about the relationship between the height of the ramp and the distance the car rolls.

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Complete question:

Mia makes a ramp out of some books and a plank of wood. He can change the height of the ramp by adding books under the plank. He rolls a toy car down each ramp. At the bottom of which ramp would the car be traveling the fastest?

The velocity of an object is indicated by the slope of an acceleration vs. time graph

Acceleration is how much velocity changes,from the definition here, the  slope of the graph tells us  how quickly the object's velocity is changing over time.

To dtermine object's velocity from an acceleration vs. time graph, you would have  to carry out the  integration of  the acceleration to get the object's velocity as a function of time.

Hence the last option is the corrcet answer here

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Answer:The velocity of an object

The speed of the wind is 20 miles per hour.

To solve this problem, we can use the formula:

Speed = Distance/Time

Let's assume that the speed of the wind is x miles per hour.

With the wind, the plane travels at a speed of 460 miles per hour. This means that its speed relative to the ground is the sum of its airspeed and the speed of the wind:

460 = Airspeed + x

Against the wind, the plane travels at a speed of 420 miles per hour. This means that its speed relative to the ground is the difference between its airspeed and the speed of the wind:

420 = Airspeed - x

We can solve this system of equations to find the airspeed of the plane:

460 = Airspeed + x

420 = Airspeed - x

Adding the two equations gives:

880 = 2Airspeed

Dividing both sides by 2 gives:

Airspeed = 440 miles per hour

Now that we know the airspeed of the plane, we can find the speed of the wind by substituting this value into one of the equations we obtained earlier:

460 = Airspeed + x

460 = 440 + x

x = 20

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According to the theory of special relativity, time and space are relative to the observer. This means that time can slow down and distances can shorten for an observer traveling at a speed close to the speed of light.

Therefore, if we could build a spaceship capable of traveling at a speed near the speed of light, we could send a ship to a star that is 500 light-years away and it would return just a few years after we launched it from the perspective of the passengers on the ship. However, for an observer on Earth, the journey would still take 500 years each way.

Similarly, passengers on the ship could make a journey to a star that is 500 light-years away within their lifetimes, even though the journey would still take 500 years from the perspective of an observer on Earth. This is because time slows down for the passengers on the ship as they approach the speed of light.

While special relativity does tell us that we cannot reach or exceed the speed of light, it also tells us that we can get close to the speed of light with much less fuel than we would have guessed from Newton's laws of motion. This is because the mass of an object increases as it approaches the speed of light, which means that it requires less fuel to accelerate it to a high speed.

In conclusion, the effects of special relativity would allow us to build a spaceship that could travel close to the speed of light and make journeys to distant stars within the lifetimes of the passengers on the ship. However, the journey would still take a long time from the perspective of an observer on Earth.

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1) The force acting on the object during the time interval 0-3 seconds is 1/3 N.

2) The force acting on the object during the time interval 6-10 seconds is -0.5 N.

3) There is no time interval in which no force acts on the object.

(i) Force acting on the object in time interval 0-3 seconds. Force acting on the object is equal to the product of its mass and acceleration, i.e.,F = ma.

In the given velocity-time graph, the acceleration of the object can be determined by determining the slope of the velocity-time graph from 0 to 3 seconds.

Slope = (change in velocity) / (change in time)= (20-0) / (3-0) = 20/3 m/s^2

Acceleration, a = slope= 20/3 m/s^2

Mass of the object, m = 50 g = 0.05 kg

∴ Force acting on the object, F = ma= 0.05 × 20/3= 1/3 N.

Therefore, the force acting on the object during the time interval 0-3 seconds is 1/3 N.

(ii) Force acting on the object in time interval 6-10 seconds. Similar to the first question, the force acting on the object in time interval 6-10 seconds can be determined by determining the acceleration of the object during this time interval.

The slope of the velocity-time graph from 6 seconds to 10 seconds can be determined as follows:

Slope = (change in velocity) / (change in time)= (-20-20) / (10-6) = -40/4= -10 m/s^2 (negative sign indicates that the object is decelerating)

Mass of the object, m = 50 g = 0.05 kg

∴ Force acting on the object, F = ma= 0.05 × (-10)= -0.5 N.

Therefore, the force acting on the object during the time interval 6-10 seconds is -0.5 N.

(iii) Time interval in which no force acts on the object. There is no time interval in which no force acts on the object. This is because, as per Newton's first law of motion, an object will continue to remain in a state of rest or uniform motion along a straight line unless acted upon by an external unbalanced force.In other words, if the object is moving with a constant velocity, there must be a force acting on the object to maintain its motion.

Therefore, there is no time interval in which no force acts on the object.

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The statement that is true about the theory of plate tectonics and the theory of continental drift C. The theory of plate tectonics gives the method by which continents can move as part of plates .

According to the scientific hypothesis of plate tectonics, the underground movements of the Earth create the primary landforms. By explaining a wide range of phenomena, including as mountain-building events, volcanoes, and earthquakes, the theory, which became firmly established in the 1960s, revolutionized the earth sciences.

The scientist Alfred Wegener is most closely connected with the concept of continental drift. Wegener wrote a paper outlining his notion that the continents were "drifting" across the Earth, occasionally crashing through oceans and into one another, in the early 20th century.

According to tectonic theory, the Earth's surface is dynamic and can move up to 1-2 inches every year. The numerous tectonic plates constantly move and interact. The outer layer of the Earth is altered by this motion. The result is earthquakes, volcanoes, and mountains.

Therefore, option C is correct.

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Answer:

Explanation:

I dont  have an explenation    

The word 'scientist' was first coined by William Whewell in the early 19th century. He proposed the term as a replacement for the previous term 'natural philosopher.

The four men who met at Cambridge in 1812 were Charles Babbage, John Herschel, George Peacock, and Richard Jones. They were all highly accomplished scientists and mathematicians, and they formed a close friendship and intellectual partnership. They discussed a wide range of scientific and philosophical topics, including the nature of knowledge, the role of mathematics in science, and the principles of inductive reasoning. Their meetings laid the foundation for the development of the modern scientific method and helped to establish the field of mathematics as a central component of scientific inquiry.

The inductive scientific method involves making observations and collecting data in order to draw general conclusions or make predictions about a particular phenomenon. It is based on the idea that knowledge can be built up gradually through the accumulation of empirical evidence. The debate surrounding this scientific method focused on the question of whether it was truly objective and reliable, or whether it was inherently biased by the particular observations and assumptions of the scientist conducting the research.

Women first began to make significant contributions to science in the 19th century, largely through the efforts of pioneers such as Mary Somerville and Caroline Herschel. These women often had to overcome significant social and institutional barriers in order to pursue scientific research, but their accomplishments helped to pave the way for future generations of female scientists.

The heroic part of the Philosophical Breakfast Clubs story is the way in which these four men collaborated and supported each other in pursuit of scientific knowledge. They were willing to challenge established ideas and take risks in order to advance their field. However, the flip side of this story is that their exclusive, male-dominated intellectual circle reinforced existing power structures and excluded women and other marginalized groups from participating in the scientific enterprise.

Darwin's statement that "science is not only for scientists" emphasizes the idea that scientific knowledge should be accessible and understandable to everyone, not just those who have specialized training or expertise. In order to fully participate in a democratic society, it is important for individuals to have at least a basic understanding of scientific concepts and methods. Whether or not one considers oneself to have a basic scientific literacy depends on individual experiences and education.

Therefore, It is important that forensics is categorized as a science because it involves the application of scientific principles and methods to the investigation of crimes and other legal matters. By using evidence-based techniques, forensic scientists can provide accurate and reliable information that can be used to make informed decisions in legal proceedings.

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Answer:

yea

Explanation:

The coefficient of friction between the road and the car's tire is determined as 0.78.

The acceleration of the car is calculated as follows;

v² = u² - 2as

0 = u² - 2as

a = u²/2s

where;

a = (26.94)²/(2 x 47)

a = 7.72 m/s²

μ = a/g

μ = (7.72)/9.8

μ = 0.78

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Answer:

The effects that certain frequencies of EMR have when absorbed by matter is explained below in complete detail.

Explanation:

Electromagnetic radiation of distinct frequencies associates with material adversely. ... Gamma rays, though commonly of somewhat greater frequency than X rays have the equivalent creation. When the power of gamma rays is consumed in material, its influence is practically indistinguishable from the outcome generated by X rays.

Answer:

speed = distance over time; 1 mile = 1609 meters. 8.9 miles per hour.

Explanation:

:)