Answer:
Cl- and Ar is the right answer:-)
HELLLPPP
why didnt people in marie curies time realize radioactivity could be harmfull?
Answer:Health
Throughout her work with radium, Marie was unaware of the effects of radioactivity exposure on the body. In her lab, she would keep tubes of radium in her pocket. [3] She began to suspect that radium negatively impacted health when one of her fellow researchers died of a blood disease, and then a few years later her personal assistant died of a blood disease. Even though she suspected that radium exposure was bad for her health, she did very little to monitor her own blood. In 1932, she broke her wrist and the break took much longer to heal than it should have. She then began to notice that her vision was deteriorating and radiation burns on her fingers were becoming more and more painful. Some days she felt too ill to even go to the lab, and finally on July 4, 1934, Marie died from aplastic anemia. [1]
Radium Exposure Treatments
Marie suspected that her health was being negatively impacted by radium exposure, but did nothing about it, most likely because there weren't any effective treatments for radium poisoning yet. At the time, scientists knew that radium was metabolized like calcium. In an attempt to remove it from the system, they manipulated calcium intake. [4] This caused little to no improvements, so parathyroid hormone was added to the treatment. Again, there was some reduction of radium, but not a significant amount. It wasn't until after Marie's death that they realized once radium is in the bones, it is extremely difficult to extract. The lack of therapies for radium exposure may explain why Marie just ignored her symptoms, because she was fully aware of her fate. [4]
© Jenna Gray. The author warrants that the work is the author's own and that Stanford University provided no input other than typesetting and referencing guidelines. The author grants permission to copy, distribute and display this work in unaltered form, with attribution to the author, for noncommercial purposes only. All other rights, including commercial rights, are reserved to the author.
Explanation:
Answer:
cause they were dumb
Explanation:
A rock is thrown horizontally from a building at 15 m/s. It hits the ground 45 m from the base of the building. How high was the building?
Answer:
Explanation:
hope this helps!
Your best friend has very low energy levels and complains of not being able to sleep at night. Determine the BMI score that would most likely contribute to this problem.
14
20
22
23
Answer: 14
Explanation: 20-23 is normal.
Answer:14
Explanation:hope this helps
What is the formula of Kinetic Energy
K.E = ½ mv²
Explanation:
The formula of Kinetic Energy
K.E = ½ mv²
Where,
m = mass of object
v = velocity of object
The Standard Unit of kinetic energy is Joule, while the Imperial Unit of kinetic energy is foot-pound
-TheUnknownScientist
Answer:
[tex]\boxed{\bold { \large { \boxed {KE=\frac{1}{2} mv^2}}}}[/tex]
Explanation:
Kinetic energy formula
[tex]\displaystyle KE=\frac{1}{2} mv^2[/tex]
[tex]\displaystyle KE \Rightarrow \sf kinetic \ energy \ (J)[/tex]
[tex]\displaystyle m \Rightarrow \sf mass \ (kg)[/tex]
[tex]\displaystyle v \Rightarrow \sf velocity \ (m/s)[/tex]
You are piloting a helicopter which is rising vertically at a uniform velocity of 14.70 m/s. When you reach 196.00 m, you see Barney (Uh-oh). A large object is projected with a horizontal velocity of 8.50 m/s from the rising helicopter. When does the ball reach Barney's head if he is standing in a hole with his head at ground level?
Answer:
The ball reaches Barney head in [tex]t = 8 \ s[/tex]
Explanation:
From the question we are told that
The rise velocity is [tex]v = 14.70 \ m/s[/tex]
The height considered is [tex]h = 196 \ m[/tex]
The horizontal velocity of the large object is [tex]v_h = 8.50 \ m/s[/tex]
Generally from kinematic equation
[tex]s = ut + \frac{1}{2} gt^2[/tex]
Here s is the distance of the object from Barney head ,
u is the velocity of the object along the vertical axis which is equal but opposite to the velocity of the helicopter
So
[tex]u = -14.7 m/s[/tex]
So
[tex]196 = -14.7 t + \frac{1}{2} * 9.8 * t^2[/tex]
= [tex]4.9 t^2 - 14.7t - 196 = 0[/tex]
Solving the above equation using quadratic formula
The value of t obtained is [tex]t = 8 \ s[/tex]
Please Help!!
Thankss
Answer:
The roller coaster gains potential energy as they reach the top of the hill. And then the energy changes to kinetic energy.
Explanation:
Calculate the mechanical advantage if a machine allows you to move a 60 newton rock by only exerting 15 newtons of force.
Answer:
4 Newtons
Explanation:
I think it's 4 because mechanical advantage = output force/input forceSo, it would be 60/15, which is 4 newtonsAnswer:
4
Explanation:
According to the Big Bang Theory, the known universe started 13.7 billion years ago in a hot dense state and expanded explosively. As it expanded, it cooled down to the point where atoms could form. By the force of gravity, these atoms coalesced into gas clouds that eventually became stars. These stars eventually formed young galaxies. Which of the following is true about the current position of the galaxies in the universe?
A.
The galaxies are now drifting further apart.
B.
The position of the galaxies cannot be predicted.
C.
The galaxies are now moving closer together.
D.
The position of the galaxies is not changing.
Answer:
A
Explanation:
Hubble’s law states that galaxies that are farther away have a greater red shift, so the speed at which a galaxy is moving away is proportional to its distance from the Earth. Red shift is a phenomenon due to Doppler shifting, so the shift of light from a galaxy to the red end of the spectrum indicates that the galaxy and the observer are moving farther away from one another. Doppler shifting also is found in the Energy and Waves section of this course.
I have been trying to do number 2 and I just don’t know what the answer is if you can help me thank you so mush
Answer:
Strong Positive Linear Line Correlation
Explanation:
According to the diagram, there is a strong positive linear line correlation between velocity and distance of galaxies. Hubble showed that galaxies are receding away from people with a velocity that is proportional to their distance from people more distant galaxies recede faster than nearby galaxies.
About the diagram: Velocity is the distance relation among extra-galactic nebulae. Radial velocities is corrected for solar motion, are plotted against distances estimated from involved stars and mean luminosities of nebulae in a cluster. The black discs and full line represent the solution for solar motion by using the nebulae individually; the circles and broken line represent the solution combining the nebulae into groups; the cross represents the mean velocity corresponding to the mean distance of 22 nebulae whose distances could not be estimated individually.
What is your hypothesis (or hypotheses) for this experiment?
Answer: In that case, Put something like "My hypothesis is that the car will take (x) seconds to get to checkpoint 1, (x) seconds to get to checkpoint 2, (x) seconds to get to checkpoint 3, and (x) seconds to get to checkpoint 4" Replacing x with random numbers, or number close to the actual found numbers, but honestly as long as the guesses arent outrageous you should get the question right
Explanation:
I formulate a hypothesis which is based on his observations as to what happens when both the rock and the wood are immersed in water.
What is Density?Density is described as mass per unit volume which is an important parameter for understanding fluid and its properties. Its unit is kilogram per cubic meter.
The mass and density relation is given as:
mass = density × volume
In this scientific investigation if the volume or density of objects determines whether solid objects float or sink in water, I performed a density, mass, and volume experiment using a rock and a standard-sized piece of wood. It is important that the chosen piece of wood is larger than the rock where the rock is small enough to fit inside the measuring cylinder.
Thus, I formulate a hypothesis which is based on his observations as to what happens when both the rock and the wood are immersed in water.
Learn more about the Density, here:
brainly.com/question/952755
#SPJ2
Your question is incomplete, most probably the complete question is:
Density of solids What is your hypothesis (or hypotheses) for this experiment?.
What is momentum of a 3kg bowling ball that is rolled at 4 m/s
what are the kinetic energy
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.
A small convex mirror is placed 60 cm from the pole and on the axis of a large concave mirror of radius of curvature 200 cm. The position of the convex mirror is such that a real image of distant object is formed on the plane of a hole drilled through the concave mirror at its pole. Calculate 'R' of convex mirror and height of the real image if distant object forms 0.5 degree angle at the pole of the concave mirror.
Answer:
Calculate 'R' of convex mirror and height of the real image
the radius of the convex mirror is 48cm
Explanation:
Distance between convex and concave mirror is =60cm
Radius of the concave mirror (R) = 200cm
For the concave mirror, u = ∞
V = {R}/{2}=100cm
The object for the convex mirror and the final image is on the pole of the concave mirror, and distance between convex and concave mirror is 60cm
u_1=60-100 =-40cm
Object will be behind the convex mirror
1/f=1/40+1/60
f=24cms
the radius of the convex mirror is 48cm
elastic collision is a collision in which there is absolutely no loss of kinetic energy true or false
Litmus paper strips were dipped in two different unknown liquids. The table below shows the pH of the two liquids: Litmus Test for Unknown Liquids Litmus Paper Strip pH of Liquid X 9 Y 4 What will happen to the litmus strips?
Answer:
Both will turn red
Both will turn blue
X will turn red and Y will turn blue
X will turn blue and Y will turn red
Answer:
X will turn blue and y will turn red
Explanation:
Since X has a pH of 9, it will turn blue because anything with a pH higher than 7 turns blue. Since Y has a pH of 4, it will turn red because anything with a pH lower than 7 turns red.
Imagine que su primo Morton baja en patineta por una rampa curva en un parque. Tratando a Morton y su patineta como una partícula, esta describe un cuarto de circulo de Radio= 3.00 m (ver figura) La masa total de Morton y su patineta es de 33 Kg. El parte del reposo y no hay fricción. Calcule su rapidez en la base de la rampa.
Answer:
Explanation:
We can solve this problem using the principle of conservation of energy.
Starting point. For higher up the ramp
Em₀ = U = m g h
where h is the height of the ramp h = 3.00 m
Final point. For low
Em_{f} = K = ½ m v²
as there is no friction the mechanical energy is conserved
Em₀ = [tex]Em_{f}[/tex]
m g h = ½ m v²
v = √ (2g h)
let's calculate
v = √(2 9.8 3.00)
v = 7.668 m / s
What change of state occurs during vaporization? liquid to gas gas to liquid solid to liquid liquid to solid
Answer:
A is correct!
Explanation:
e2020
Answer:
a
Explanation:
right on edge :)
Optimal cardiorespiratory fitness requires a BMI of __________.
A.
18.5 to 24.9
B.
25.0 to 29.9
C.
30.0 to 39.9
D.
40.0 to 49.9
Answer:
A
Explanation:
proof of conservation of energy
The angle between the incident ray and reflected ray is 1000. What is the value of angle of incidence?
Answer:
straight anglei think
2.05 × 108 kg of water is pumped up through a vertical height of 500 m.
Answer:
1 x 10¹²J
Explanation:
Given parameters:
Mass of the water pumped = 2.05 x 10⁸kg
Height = 500m
Unknown:
Potential energy = ?
Solution:
The potential energy amassed by water at this height is expressed as;
P.E = mgH
m is the mass
g is the acceleration due to gravity
H is the height
Insert the parameters and solve;
P.E = 2.05 x 10⁸ x 9.8 x 500 = 1 x 10¹²J
A 30 kg TV falls out of a 5 meter high window, reaching a
maximum speed of 10 m/s. What is the TV's momentum just
before it hits the ground?
Answer:
300kgm/s
Explanation:
Given parameters:
Mass of TV = 30kg
Height of building = 5m
Maximum speed = 10m/s
Unknown:
Momentum before it hits the ground = ?
Solution:
Momentum is the quantity of motion a body possess or contains. It is expressed as;
Momentum = mass x velocity
Insert the parameters and solve;
Momentum = 30 x 10
Momentum = 300kgm/s
Hi sorry for yesterday
Explanation:
Please explain the different ways offense can score and how many points each way is worth? Answer in complete sentences.
Answer:
what sport bruh
Explanation:
Answer:
in wat sport exactly
Explanation:
in eat sport
Rubidium forms the positive ion Rb+. Does this ion have more or fewer electrons than the neutral atom?
Answer:
The ion has fewer electrons
Explanation:
As Rubidium forms a positive ion Rb⁺ the number of electrons becomes fewer for the atom.
A positive charge on an ion indicates that the number of protons for the atom is greater than the number of electrons. This leaves a net positive charge on the atom.For a negatively charged ion, the number of electrons is more than the number of protons because they have gained additional electrons. In a neutral atom, the number of protons and electrons are the same.Rubidium forms the positive ion (Rb+) because it has fewer electrons than the neutral atom.
HOW DOES AN ATOM BECOME POSITIVELY CHARGED:
An atom is the smallest indivisible particle of an element. It consists of three subatomic particles namely: proton, electron and neutron. Proton is the positively charged component (+) while electron is the negatively charged component (-). The proton and electron number is equal in a neutral atom. An atom becomes positively charged when it loses electrons. The number of protons becomes more in a positively charged atom. For example, Rubidium forms the positive ion (Rb+) because it has fewer electrons than the neutral atom.Learn more at: https://brainly.com/question/12065456?referrer=searchResults
If an object is in motion, then the object will ______
because ______________________.
Answer:
If an object is in motion, then the object will stay in motion because they go the same direction unless acted upon by an unbalanced force.
Explanation:
i got it right . :)
What training does an osteologist need? (ANATOMY)
Answer:
Requirements to become an Osteologist
Explanation:
After completing the bachelor's degree, students should begin working towards a master's degree or Ph. D specializing in forensic anthropology. Forensic anthropology is closely related to osteology and it will help in the forensic work.
the Earth which is 150 million km from the Sun takes 365 days to complete one orbit assume the orbit to be in a circle find the length of the of the orbit giving your answer in standard form 2 correct to three significant figures
Answer:
Orbit/circumference = 471.24 million .
c = 2πr
150/2 = radius
radius = 75.
π = 3.14
2 x π x 75 = 471.24
Can someone help me in physics
What does the number of protons tell us about an element?
Answer:
All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms. ... Therefore, the atomic number of an atom also tells you how many electrons the atom has. This, in turn, determines many of the atom's chemical properties.
A car speeds up from 14 meters per second to 21 meters per second in 6 seconds. Whats the acceleration and the distance passed within that time?
Answer:
a = 1.666... m/s²
Explanation:
a = v2 - v1 / t2 - t1
a = 21m/s - 14m/s / 6s - 0s
a = 7m/s / 6s
a = 1.666... m/s²