Answer:
Periods indicate that a new period at a new principal energy level which is filled with electrons. Groups indicate that the elements share similar properties because their shells are filled with the same number of valence electons.
Explanation:
We see that starting at period 2 Li has a +1 charge , He has +2 charge, B has +3 charge, C has the potential to have a +4 charge or -4 charge (because it can gain or loose electrons) and N has a -3 charge, etc. Groups however, have similar properties and every element in a 1A - 8A has the same number of valence electrons. All except the noble gases in which He only needs 2 electrons to be in a perfect state. This is its octet as it would be a completely different element if it had more than 2 electrons in its shell. An example of the groups sharing similar properties is if we were to look at group 1A. In group 1A we find H, Na, K, etc. These are all highly unstable elements when alone (not in a compound) and they are very reactive. If you were to put Na for instance in water, it would light up and you'd see a flame sitting on top of the water. A scientist could do that with the rest of the elements in the group and they would see this increasing in reactivity as you go down the periods. Francium isn't visible long enough to be able to see this happen though. It's more of that kind of element that scientists prove that it exists, but not a very common element to get to learn much about.
Singly charged uranium-238 ions are accelerated through a potential difference of 2.20 kV and enter a uniform magnetic field of 1.90 T directed perpendicular to their velocities. Determine the radius of their circular path.
Answer:
r = 0.0548 m
Explanation:
Given that,
Singly charged uranium-238 ions are accelerated through a potential difference of 2.20 kV and enter a uniform magnetic field of 1.90 T directed perpendicular to their velocities.
We need to find the radius of their circular path. The formula for the radius of path is given by :
[tex]r=\dfrac{1}{B}\sqrt{\dfrac{2mV}{q}}[/tex]
m is mass of Singly charged uranium-238 ion, [tex]m=3.95\times 10^{-25}\ kg[/tex]
q is charge
So,
[tex]r=\dfrac{1}{1.9}\times \sqrt{\dfrac{2\times 3.95\times 10^{-25}\times 2.2\times 10^3}{1.6\times 10^{-19}}}\\\\r=0.0548\ m[/tex]
So, the radius of their circular path is equal to 0.0548 m.
What 2 materials are the planets in our solar system made of?
Please answer this quickly please please please please please please please
they are made up of rock and gas
Answer:
Hydrogen and Helium. 75% Hydrogen and 25% Helium.
Explanation:
4. Someone took the last cookie in the cookie jar last night. The LAST
person to leave this scene is the culprit. Who was it? (see below)
O
A. The cook with the motor cycle
B. The maid with the car
O
C. The handyman with the bike
D. The nephew and the dog
What’s the answer
Answer:
I think B is the answer
Explanation:
I think this cause a maid always cleans the house and might be awake at night
The vertical columns on the periodic table of elements are called groups.
A True
B. False
Answer:
True
Explanation:
The codons ___, ___ and ___ are the stop codons that signal the termination of translation.
ACA
UGG
UAA
UGA
UCC
UAG
Answer:
uaa,uag,uga
Explanation:
In a chemical reaction, an iron atom becomes the ion Fr2+ . What happened to the ion atom
Answer:
In a chemical reaction, an iron atom became the ion which means that iron atom by loosing two electrons from its valence shell has oxidized into positively charged ion
Explanation:
Electric field shows the strength and what of an electric field
Answer:
a region in which particles with an electric charge will experience a force
Explanation:
let me know if its wrong . sorry if it is
A 2 kg ball of clay moving at 35 m/s strikes a 10 kg box initially at rest. What is the velocity of the box after the collision?
Answer:
V = 5.83 m/s
Explanation:
Given that,
Mass of a ball of a clay, m = 2 kg
Initial speed of the clay, u = 35 m/s
Mass of a box, m' = 10 kg
Initially, the box was at rest, u' = 0
We need to find the velocity of the box after the collision. Let V be the common speed. Using the conservation of momentum to find it.
[tex]mu+m'u'=(m+m')V\\\\V=\dfrac{mu+m'u'}{(m+m')}\\\\V=\dfrac{2\times 35+10\times 0}{2+10}\\\\V=5.83\ m/s[/tex]
So, the velocity of the box after the collision is equal to 5.83 m/s.
describe what happens when light strikes a translucent material, transparent material , opaque material . give one specific example of an object that has each type of surface.
Answer: according to https://www.doe.virginia.gov When light strikes translucent materials, only some of the light passes through them. The light does not pass directly through the materials. ... Opaque objects block light from traveling through them. Most of the light is either reflected by the object or absorbed and converted to thermal energy.
Explanation:
A line graph is constructed to display the data from Data Table 2. Add a correct title and labels for the axes
Answer:
mass kg velocity m/s kinetic energy j
List 3 main types weathering
Answer:
3 types of weathering are, physical, chemical and biological weathering.
Explanation:
Hope this helps and have a wonderful day!!!
"On a good day, it takes Mr. Hess 23 minutes (1380 seconds) to drive the 12 miles (19,300 meters). What is his average velocity on the way to school?"
I uh, don't understand this at all. If someone could help me solve this, I'd greatly appreciate it!
Answer:
his average velocity is
[tex]v = \frac{19300}{1380} = 13.9855(m \div s)[/tex]
Magnetic field lines are more concentrated at the poles of the magnet
True
False
Answer:
True! UwU
Explanation:
the magnetic field is strongest near to the poles of the magnet were the lines of flux are more closely spaced.
A ball of mass 0.5 kg is swinging at a small angle from a light string of length 0.25 m. What is the period of this pendulum? Round answer to two significant digits.
Answer: 1.0
Explanation:
not sure why but that is the correct answer
Answer:
1.0
Explanation:
Correct answer on Khan Academy
How would radiation occur in space?
Answer:
Space radiation is made up of three kinds of radiation: particles trapped in the Earth's magnetic field; particles shot into space during solar flares (solar particle events); and galactic cosmic rays, which are high-energy protons and heavy ions from outside our solar system.
Explanation:
What is the genotypes for HH or hh called?
What happens when waves slow down and change direction?
Answer:
Refraction
Explanation:
Refraction is the change in direction of a wave as it slows down. ... Tsunamis also refract around land masses
How does the Coriolis effect influence the direction of the Trade Winds in the Northern Hemisphere? Does it have the same effect in the Southern Hemisphere?
Answer:
Part A
Coriolis effect is used to describe how objects which are not fixed to the ground are deflected as they travel over long distances due to the rotation of the Earth relative to the 'linear' motion of the objects
Due to the Coriolis effect the wind flowing towards the Equator from high pressure belts in the subtropical regions in both the Northern and Southern Hemispheres are deflected towards the western direction because the Earth rotates on its axis towards the east
Part B
In the Northern Hemispheres, the winds are known as northeasterly trade winds and in the Southern Hemisphere, they are known as the southeasterly trade wind. Therefore, Coriolis effect has the same effect on the direction of the Trade Winds in the Southern Hemisphere as it does in the Northern Hemisphere
Explanation:
how does lightning occur
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Answer:
Lightning is an electrical discharge caused by imbalances between storm clouds and the ground, or within the clouds themselves. Most lightning occurs within the clouds. ... This heat causes surrounding air to rapidly expand and vibrate, which creates the pealing thunder we hear a short time after seeing a lightning flash.
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Brainliest?
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Answer:
Lightning can be explained in terms of charges produced due to rubbing. During a thunderstorm, the air currents move upwards and the water droplets move downwards. And this caused due to the separation of charge due to this vigorous motion.
Explanation:
help me
please
lol
?????
Answer:
150 N= 15 or 150 N= 1.1
Explanation:
What I did was subtract 165kg and 150 N and I divided it too but I got 1.1 so yuhh
How do volcanos effect ecosystems? in ur own words please!!
Answer:
well i guess i can try...
Explanation:
Volcanoes are a dangerous natural occurance that can greatly effect any ecosystems. There are various effects of volcanoes such as, lava flows, volcanic landslides, mud-flows, and ash flows, which generally result in total obliteration of any ecosystem in their path, they can also have long term beneficial effects to the environment. One of these long term effects are, the creation of some of the most nutrisous, and fertile soil on earth, causing healthy plants to grow.
If a rocket is launched with a velocity of 8,000 m/s, how high does it rise?
If a rocket of mass 117 kg is launched with a velocity of 800 m/s, so, the height is 32000m.
What is Kinetic energy?Kinetic energy is defined as the energy possessed by an object due to its motion that can be transferred between objects and converted into other forms of energy. It can be expressed as:
[tex]K.E.= 1/2 mv^2[/tex]
For above given information,
m is the mass which is 117kg
v is the velocity which is 8000m/s
So,
K.E.= [tex]1/2 (117)* (8000)^2[/tex]= [tex]3.744*10^7[/tex] Joules
So, we assume kinetic energy is equal to gravitational potential energy
G.P.E.= mgh
where, g is the gravitational strength which is 10N/kg for Earth
So,
[tex]3.744*10^7= (117).(10). h\\h= 3.744*10^7/1170\\h= 32000m[/tex]
So, the rocket of mass 117 kg is launched with a velocity of 800 m/s, so, the height is 32000m.
Learn more about Kinetic energy, here:
https://brainly.com/question/26472013
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Your question is incomplete, most probably the complete question is :
If a rocket of mass 117 kg is launched with a velocity of 800 m/s, how high does it rise?
in which of the following does enstein's famous equation apply?
A. a driver brings a car to a halt
B. collisions between objects
C. water falling in a waterfall
D. nuclear fission and fusion reaction
Answer:
D
Explanation:
The gravitational force between two objects will be greatest in which of the following situations?
Both objects have small masses are close together.
One object has a large mass, and the objects are close together.
Both objects have large masses and are close together.
Both object have large masses, and they are far apart.
Answer:
One object has a large mass, and the objects are close together.
Need an actual answer, no links.
Answer:
8.70 s
Explanation:
Given (in the y direction):
v₀ = 2.38 m/s
v = 0 m/s
a = 0.310 sin (-62.0°) m/s²
Find: t
v = at + v₀
0 m/s = (0.310 sin (-62.0°) m/s²) t + (2.38 m/s)
t = 8.70 s
Can an object have both kinetic energy and gravitational potential energy? Explain.
Answer:
Yes
Explanation:
An object can be moving (have kinetic energy) and be elevated above the ground at the same time (and also have potential energy).
Yes an object can be moving have kinetic energy and be elevated above the ground at the same time and also have potential energy.
What is energy?Energy is the ability or capability to do tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.
The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it. We must put in effort in order to apply a force. Following work, energy is transmitted to the item, which causes it to move at a new, constant speed. An object can store energy as the result of its position is potential energy.
An object can be moving have kinetic energy and be elevated above the ground at the same time and also have potential energy.
To learn more about energy refer to the link:
brainly.com/question/1932868
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Which statement describes a digital signal used to store information?
A. It includes sound waves you make.
B. It moves gradually among an infinite number of values.
C. It includes visible light waves.
D. It is easy to copy.
SUBMIT
Help
Answer:
D. It is easy to copy.
Explanation:
It is not B, or A, nor C.
Answer:D
Explanation:
Thermal conductivity of a material is given as 129Btuft–¹ h–¹°F–¹.Calculate this thermal conductivity in Jm–¹s–¹°C–¹(Given: 1Btu=1055J;0.3048m=1ft; and 1 °F= (5/9)°C)
Answer:
223.25 [tex]$\text{Jm}^{-1}\text{s}^{-1}^\circ\text{C}^{-1}$[/tex]
Explanation:
The thermal conductivity of an object is defined as the measure or the ability of the object to transfer heat or conduct heat through its body.
In the context, the thermal conductivity of the material is given as
[tex]$=129 \text{ Btu ft}^{-1}\text{h}^{-1}^\circ\text{F}^{-1}$[/tex]
And it is given that :
1 Btu = 1055 J
1 ft = 0.3048 m
[tex]$1^\circ F = \frac{5}{9}^\circ C$[/tex]
We know that 1 h = 3600 s
So the thermal conductivity of the material in [tex]$\text{Jm}^{-1}\text{s}^{-1}^\circ\text{C}^{-1}$[/tex] is :
Thermal conductivity :
[tex]$=\frac{129 \text{ Btu}}{1 \text{ ft }\times \text{1 h}\times 1^\circ\text{F}}$[/tex]
[tex]$=\frac{129 \times 1055 \text{ J}}{0.3048 \text{ m} \ \times 3600 \text{ s}\ \times \frac{5}{9}^\circ \text{C}}$[/tex]
= 223.25 [tex]$\text{Jm}^{-1}\text{s}^{-1}^\circ\text{C}^{-1}$[/tex]
Car #1 has a mass of 1000 kg and moves with a velocity of 10 m/s north.
Car #2 has a mass of 500 kg and moves with a velocity of 10 m/s north.
Compare and contrast Car #1 and Car #2.
A.
Car #1 has 2-times the momentum as Car #2
В.
Car #1 has 4-times the momentum as Car #2
Car #2 has 2-times the momentum as Car #1
D.
Car #2 has 4-times the momentum as Car #1
Answer:
A. Car #1 has 2-times the momentum as Car #2
Explanation:
Momentum is defined as the product of mass and velocity:
[tex]P = mv[/tex]
where,
P = Momentum
m = mass
v = velocity
FOR CAR # 1:
m = 1000 kg
v = 10 m/s
Threfore,
[tex]P_1 = (1000\ kg)(10\ m/s)\\P_1 = 10000\ N.s[/tex]
FOR CAR # 2:
m = 500 kg
v = 10 m/s
Threfore,
[tex]P_2 = (500\ kg)(10\ m/s)\\P_2 = 5000\ N.s[/tex]
Dividing both momentums:
[tex]\frac{P_1}{P_2} = \frac{10000\ N.s}{5000\ N.s}\\\\P_1 = 2P_2[/tex]
Therefore, the correct option is:
A. Car #1 has 2-times the momentum as Car #2
A 12 V battery is connected to a circuit with a 4 resistor. What is the current through the resistor?
О ЗА
8A
16 A
O 48 A
