Explain why the atomic mass of an element is weighted average mass

Explanation:

The mass written on the periodic table is an average atomic mass taken from all known isotopes of an element. This average is a weighted average, meaning the isotope's relative abundance changes its impact on the final average. The reason this is done is because there is no set mass for an element.

A force of 77 N is used to move a desk 1.5 m. How much work was done?
A. 75.2 J
B. 121.0 J
C. 115.5 J
D. 51.3 J​

Explain how the intensity of the UV light varies across the Earth

Einstein published three major scientific papers. One of these put forward a new way of calculating the size of molecules. Another explained Brownian motion — the random dance performed by specks of dust trapped in a fluid. Einstein suggested that the tiny particles making up the fluid — its atoms or molecules — were bouncing against the specks of dust and causing the motion. These papers helped to establish the reality of atoms and molecules. Another of Einstein’s 1905 papers explained the photoelectric effect — the way that metals could emit electrons (tiny charged particles) from their surface when light was shone on them. Most scientists believed that light travelled in waves — like sound or water waves. But Einstein suggested that the photoelectric effect could be explained if light could also behave as a stream of tiny packets of energy.
(2) Einstein’s paper on the photoelectric effect helped give birth to quantum theory, and it was for this paper that Einstein received the Nobel Prize in 1922. Quantum theory led, in the 1920s and 1930s, to another revolution in physics. Physicists showed that, as well as light waves behaving like particles, particles could sometimes act as waves. This theory established “objective probability” in physics. This was the idea that completely unpredictable chance events can take place at the subatomic level. Einstein never fully accepted the prevalent interpretation of quantum theory. But, while many of these interpretations involve wild metaphysical flights of fancy, the physical results are, like those of relativity, very well established.
(3) Marrying together the two pillars of 20th century physics — relativity and quantum theory — is a central problem for physics even today. Successfully doing this may require a revolution in science similar to those begun by Newton and Einstein. There are three main interconnected driving forces for such changes in science. The first is the development of technology. Changes in technology can make new experiments possible and they also influence the problems that scientists develop an interest in. Newton was fascinated by the new machines of the 17th century. Similarly, Einstein was fascinated by electricity and magnetism. This influence also works in a negative way. The governments and multinationals that control technology are often able to dictate what is researched.
(4) The second factor driving scientific progress is the way that the dominant ideas in society change. Ideas from the broader culture can impinge upon science. Newton’s ideas were part of a revolutionary new attempt at a rational explanation of both nature and society. On the other hand, the dominant ideas in society can also limit the development of science. This is most obvious in the social sciences, where delving too deeply into how society is organized might raise difficult questions for our rulers. Less is at stake in the natural sciences. Indeed, improvements in natural sciences are vital to our rulers if they want to compete effectively with each other. But the distorted worldview of capitalism still impacts on science. Extremely narrow and specialized bodies of knowledge develop—creating problems for scientists trying to bring about the kind of sweeping revolution heralded by Einstein.
(5) Finally, science moves forward because scientists seek to develop logically consistent theories. This can push them beyond the dominant or common sense ideas of their time. Einstein’s breakthrough cannot be reduced simply to changes in technology or wider cultural and ideological shifts. Science is not simply the gathering and ordering of data about the outside world. It also requires abstraction—developing theories about the underlying laws of nature that are usually not immediately apparent. This crucial role of theory is not just a feature of the natural sciences.
(6) Einstein argued that “common sense is the prejudices acquired by age 18”. Marxist theory, which is a social science topic, challenges “common sense” political ideas. If we, according to this theory, want to change the world, we need to combine our actions with theory that digs below the surface appearance of society to understand how the system works.What is the writer’s point of view?

Describe the mechanisms by which out-of-plane deformation in the laser forming
process can occur. As part of your answer, identify the mechanism of laser forming
which is active for the experimental results provided.

Which statement accurately describes how voltage and electrical power are related?

By lessening the effects of friction there would be?

You observe your friend standing in line at the cafeteria. You conclude they are buying lunch today. This is an example of: A. A scientific theory. B. An independent variable. C. An inference. D. A hypothesis

Mechanical energy is the sum of
energy and potential energy.

how many components can be realized of a vector?​

Ethanol has a specific latent heat of evaporation of 855kJ/kg. Calculate
the energy required to boil 0.60kg of ethanol.

why does light reflecting off of a piece of paper get scattered in all directions even though it appears to be flat and smooth? (be sure to include the idea of the normal line in your explanation)

If you apply an effort of 240N to a simple machine with a mechanical advantage of 3, what resistance force will the machine produce?

Does dispersive power of the material of a prism depends upon the shape, size and angle of prism? Explain.
​

help which is the balanced equation

calculate the momentum, A bald eagle with a mass of 26.4 kg and velocity of 15.6 m/s​

3. When are ionic compounds able to conduct electricity?

The speed of the cart after 3 seconds of Low fan speed is

A 5OKG mass is taken to the moon and the mass determined there, comment on the likely result of the measurement

A jogger has an average stride length of 140 cm and takes an average of 200 steps per minute. The jogger's average speed would be

Why we need to remove seeds from cotton balls?

Which of the following would cause the greatest increase in gravitational
force between two objects?
OA. Reducing the mass of one object by half
OB. Doubling the mass of one object
OC. Doubling the distance between the objects
D. Halving the distance between the two objects

This country and the chairs they experience after their independence was , in part due to lack of experience in democratic self -government

I WILL MARK BRAINLIEST IF ANSWER CORRECTLY
NO LINKS

Calculate the force on a unit positive charge at p on x axis whose co-ordinates are (x=2m,y=0) due to the following two charges 1. A positive charge of 10−9C situated in air at the origin (X=0,y=0). 2. A negative charge of -2*10−9C situated on X axis(x=1m, y=0

A boy spins a top on a table. How can he INCREASE the total energy of this system?

A. Decrease the height of the table

B. Spin the top more slowly

C. Spin the top faster

D. Increase the friction of the table.

If two balls have the same volume, but ball A has twice as much mass as ball B, which one will have the greater density?

During radioactive beta-decay, a neutron (1.6749x10-27 kg) at rest decays into a very slow moving proton (1.6726x10-27 kg) and a fast electron (9.109x10-31 kg). What is the speed of the electron? (Hint: find the total energy of the electron)

3. Specify the wrong sentences.
a) young stars at this stage are called red giant. True/False
b) The stars go to the end of their lives by turning most of their hydrogen into helium. True/False
c) Helium sink inside the star, causing its temperature to rise and swelling on the outside, thus extending it. These stars "swollen (puffy)" are known as Supernova. True/False​

describe fluid friction and static friction in your own words

Which statement best describes the relationship between atoms and nuclear forces? (2 points)
Group of answer choices

Strong nuclear forces hold the nucleus of an atom together. Weak nuclear forces hold neutrons and electrons together.

Weak nuclear forces hold the nucleus of an atom together. Strong nuclear forces are responsible for breaking down atoms.

Weak nuclear forces hold small atoms together. Strong nuclear forces hold large atoms together.

Strong nuclear forces hold the nucleus of an atom together. Weak nuclear forces are involved when certain types of atoms break down.

What is ima of the
doorknob