Answer:
Valence electrons are electrons that tend to stay in the highest energy levels of an atom and are involved in chemical bonding.
Answer:Valence electrons are outer shell electrons with an atom and can participate in the formation of chemical bonds. In single covalent bonds, typically both atoms in the bond contribute one valence electron in order to form a shared pair. ... Most atoms do not have eight electrons in their valence electron shell.
Explanation:
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If a radioactive material has a 10 year half-life, how much of a 100 g sample will be left after 30 years?
Answer:
12.6 g
Explanation:
Since it has a half life of 10 years and the question asks for 30 years all you need to do is divide 100 in half 3 times
If the net force on an object is zero, what would be its acceleration
submarines use ______ of air to control their depths in water
Answer:
A supply of compressed air is maintained aboard the submarine in air flasks for life support and for use with the ballast tanks. In addition, the submarine has movable sets of short "wings" called hydroplanes on the stern (back) that help to control the angle of the dive.
Explanation:
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A skateboarder skates down a ramp for 3 seconds. If his initial velocity was 0.8 m/s and · his final velocity was 7 m/s, what was his acceleration?
Answer:
The acceleration of the skateboarder is 2.067 m/s²
Explanation:
Given;
initial velocity of the skateboarder, u = 0.8 m/s
final velocity of the skateboarder, v = 7 m/s
time of motion, t = 3 s
The acceleration of the skateboarder is given as;
[tex]a = \frac{v-u}{t}\\\\a = \frac{7-0.8}{3}\\\\a = 2.067 \ m/s^2[/tex]
Therefore, the acceleration of the skateboarder is 2.067 m/s²
What is Biomass?
What is Biofuel?
Please help me science students
Answer:
Biomass-Total of mass of organisms in a given area/volume
Biofuel-A fuel directly from living matter.
which of the following is a pure substance?
a. solution
b. compound
c. homogeneous mixture
Answer:
B.
Explanation:
In a scientific context, “pure” denotes a single type of material. Ostensibly, compounds contain more than one type of material. Yet both compounds and elements are considered pure substances. Pure compounds are created when elements combine permanently, forming one substance.
Taylor Swift weighing 794 N gets on an elevator. The elevator uses 313 W of power to lift the person 22.0 m. How much time did the elevator take to lift the Taylor?
Answer:
55.80s
Explanation:
Power is calculated using the expression
Power = Work done/Time
Workdone= Force ×distance
Workdone = 794×22
Work done = 17468Joules
From the power formula
Time = Workdone/Power
Time = 17468/313
Time = 55.80seconds
The elevator takes 55.80seconds to life the Taylor
How many seconds does a player have to shoot a free throw? Group of answer choices 5 seconds 30 seconds 10 seconds 1 minute
Answer:
10 seconds
Explanation:
In an unusual move by the New York State Department of Transportation, all of the "speed limit" signs were replaced with "velocity limit" signs.Why are the devices in cars called speedometers and not velocitometers? a. What would such a sign look like? b. How could one travel faster than the old speed limit, without violating
Answer:
In an unusual move by the New York State Department of Transportation, all of the "speed limit" signs were replaced with "velocity limit" signs
The devices are called as 'Speedometer' and not 'Velocity meters' because speedometer only gives the magnitude of the speed but not direction while velocity is vector quantity which will show speed as well as direction of the vehicle. Such signs could possibly look like ' Maximum legally permissible strength of velocity for forward progress is 30'
Once can definitely travel faster using velocity meter than the old speed limit, it is because c=velocity includes displacement as it is vector. Hence it will allow the passengers to move in straight path without moving here and there on the road and it will help them reach their destination much faster than the old method without violating the rules.
how do magnetic trains work and what advantages do they have compared to regular trains
Answer:
magnetic trains works at the principle of repel on of the advantage is that they are fast and dont really need diesel
A ball is thrown horizontally from the top of a building and strikes the sidewalk after 2.8 s. How tall is the building? Neglect air resistance.
Answer:
h = 38.41 m
Explanation:
Given that,
A ball is thrown horizontally from the top of a building and strikes the sidewalk after 2.8 s.
We need to find the height of the building. Let it is h.
Initial speed of the ball, u = 0
Using second equation of motion to find h as follows :
[tex]h=ut+\dfrac{1}{2}at^2\\\\\text{Put u = 0 and a = g}\\\\h=\dfrac{1}{2}gt^2\\\\=\dfrac{1}{2}\times 9.8\times 2.8^2\\\\=38.41\ m[/tex]
So, the building is 38.41 m tall.
If the same force is exerted on objects with different mass, then the object with less mass have a (smaller or bigger -pick one) change in velocity.
Please answer soon!!! is it smaller or bigger and if you can please explain as well !!!!
A piece of rocky debris in space has a semi major axis of 45.0 AU. What is its orbital period?
Complete Question
Planet D has a semi-major axis = 60 AU and an orbital period of 18.164 days. A piece of rocky debris in space has a semi major axis of 45.0 AU. What is its orbital period?
Answer:
The value is [tex]T_R = 11.8 \ days[/tex]
Explanation:
From the question we are told that
The semi - major axis of the rocky debris [tex]a_R = 45.0\ AU[/tex]
The semi - major axis of Planet D is [tex]a_D = 60 \ AU[/tex]
The orbital period of planet D is [tex]T_D = 18.164 \ days[/tex]
Generally from Kepler third law
[tex]T \ \ \alpha \ \ a^{\frac{3}{2} }[/tex]
Here T is the orbital period while a is the semi major axis
So
[tex]\frac{T_D}{T_R} = \frac{a^{\frac{3}{2} }}{a_R^{\frac{3}{2} }}[/tex]
=> [tex]T_R = T_D * [\frac{a_R}{a_D} ]^{\frac{3}{2} }[/tex]
=> [tex]T_R = 18.164 * [\frac{ 45}{60} ]^{\frac{3}{2} }[/tex]
=> [tex]T_R = 11.8 \ days[/tex]
The orbital period of the rocky debris in space is 12 days.
From Kepler's law, we know that the square of the period of a planet in years is equal to the cube of its mean distance from the sun in astronomical units (AU).
Mathematically;
[tex]T^2 = r^3[/tex]
Now, we have the mean distance as 45.0 AU, we need to obtain its period.
semi major axis of debris rR= 45.0 AU
semi major axis of planet D rD = 60 AU
Period of planet D TD = 18.164 days
Period of debris TR = ?
[tex]\frac{TR^2}{TD^2} = \frac{rR^3}{rD^3}[/tex]
[tex]\frac{rR^3}{rD^3} * TD^2[/tex]
[tex]TR^2 = 45^3/60^3 * 18.164^2[/tex]
TR = 12 days
Missing parts:
Planet D has a semi-major axis = 60 AU and an orbital period of 18.164 days. A piece of rocky debris in space has a semi major axis of 45.0 AU. What is its orbital period?
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What is the power of an electric with a current of 0.5 A and a voltage of 120 V ? The formula for power is P =IV
Answer:
60Watts
Explanation:
Given parameters:
Current = 0.5A
Voltage = 120V
Unknown
Power = ?
Solution:
The power in the electric circuit is the product of current and voltage;
P = IV
Insert the given parameters and solve;
P = 0.5 x 120
P = 60Watts
Which of the following is an example of convection?
A
heating an iron pipe by placing it into a fire
B
warming one's hands by rubbing them together
C
melting an ice cube in a microwave
D
heating water to a rolling boil
Answer:
D. Heating water to a rolling boil
A graph titled Position versus time for with horizontal axis time (seconds) and vertical axis position (meters). The line runs in 3 straight segments from 0 seconds 0 meters to 4 seconds 12 meters to 6 seconds 12 meters to 12 seconds 0 meters.
Use the graph to determine the velocity between 6 and 12 seconds.
m/s
A -2
B -1
C 0
D 1
E 2
What was the velocity over the entire trip?
A -2
B -1
C 0
D 1
E 2
m/s
Answer:
The first one is 3 m/s
The second one is 2 m/s
Explanation:
Answer:
first one is
-2
Second one
0
Explanation:
trust me
The longer the wavelength, the lower the frequency, and the lower the energy. Lesson 4.07 True False
Question 25
1 pts
A bowling ball rolls off the edge of a giants table at 15 m/s horizontally. If it takes 2 s
for the ball to hit the ground, what is the height of the table?
O 80 m
40 m
50 m
O 10 m
20 m
kk
A 5000kg freight car moving at 2 m/s East collides with a 10,000kg freight car at rest. Upon collision, they got stuck and moved with same velocity. Find their final velocity after collision
Answer:
A
Explanation:
How does air flow in a high-pressure system?
Answer:
Winds blow away from high pressure. Swirling in the opposite direction from a low pressure system, the winds of a high pressure system rotate clockwise north of the equator and counterclockwise south of the equator. This is called anticyclonic flow.
Explanation:
hope it helps
Temperature is a measure of how much the atoms in a substance are moving. Why is a substance hotter in the gas
state than in the liquid state?
Atoms can move to change a liquid's shape.
O Atoms can be compressed when in the gas state.
Atoms move more freely in the gas state.
Atoms move in the gas state but not the liquid state.
Answer:
Atoms move more freely in the gas state.
Explanation:
e2020
A substance is hotter in the gas state than in the liquid state because atoms move more freely in the gas state.
What is temperature?The term "temperature" describes how hot or cold a body is. It is, specifically, a method of calculating the kinetic energy of the particles that make up an item. When particles move more quickly, the temperature rises, and vice versa.
Nearly every aspect of our daily lives and all scientific fields, from physics to geology, are significantly influenced by temperature.
The average kinetic energy of the particles in an object is measured by its temperature. The velocity of these particles likewise increases as the temperature rises.
As atoms move more freely in the gas state, a substance is hotter in the gas state than in the liquid state.
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2. A mover is pushing on a very large box with a force of 850 N, but he can't get it to move.
What force is the box exerting on the mover?
How is thermal energy transferred during conduction?
Answer:
Conduction occurs when a substance is heated, particles will gain more energy, and vibrate more. These molecules then bump into nearby particles and transfer some of their energy to them. This then continues and passes the energy from the hot end down to the colder end of the substance.
Explanation:
May I have brainliest please? :)
pls do question 1 part d). tysm
Answer:
c
Explanation:
cuz its informing the length of 5 and weight on 20N
A sprinter starts from rest and reaches a speed of 15 m/s in 4.25 s. Find his acceleration
Answer:
a=3.53 m/s^2
Explanation:
Vo=0 m/s (because he is not moving at the start)
V1=15 m/s
t= 4.25 s
a = (V1-Vo) / t = 15/4.25 = 3.53 m/s^2
if i roll pieces of allium foil in a ball what property of aluminium foil changes as a result of my action
Answer:
Malleability
Explanation:
The ability to roll aluminum foil in a ball is the property of metal called malleability.
Metallic bonds in metals makes it possible for them to take different shape without losing internal cohesion. Metals are malleable and they posses a wide range of physical properties. A malleable metal can be beaten into sheets and molded into many shapes.The length of a rectangle was measured to be (6 + 0.01) cm and its width was measured
to be (4 0.01) cm, then the percentage of error in measuring the perimeter of
the rectangle is
(a) 0.2%
(b) 0.4 %
(c) 0.1 %
(d) 2 %
Answer:
m hundred percent sure c
A block of cheese is sliding up an inclined surface that is not smooth.
What is the correct free body diagram for the block of cheese? (help!!!)
Answer:
Explanation:
KHAN ACADEMY
Free body diagram of a block of cheese is sliding up an inclined surface that is not smooth is shown in the diagram.
What is free body diagram?A graphic, dematerialized, symbolic representation of the body (a structure, element, or fragment of an element) in which all connecting "parts" have been eliminated is known as a free-body diagram.
Force acting on the block is F in upward direction and frictional force acting on the body in opposite to the motion is f. and weight of the body is mg. and normal reaction of the body is R = mgsinθ. where, θ is angle of inclination of the surface.
Then, free body diagram is according to the figure.
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A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as officials boat pulls up next to the spy’s boat, both boats reach the edge of a 5.4 m waterfall. The spy’s speed is 14 m/s and the officials speed is 26 m/s.
How far apart will the two weeks vessels be when they land below the waterfall? The acceleration of gravity is 9.81 m/s^2. Answer in units if m.
Answer:
They are 7.4m apart.
Explanation:
I got the Feds 12.6 m ahead of the crooks when both boats hit the water under the falls.
Why is Florida more vulnerable to the effects of climate change?
Answer:
Along the Atlantic and Gulf Coasts of Florida, the land surface is also sinking. If the oceans and atmosphere continue to warm, sea level along the Florida coast is likely to rise one to four feet in the next century. Rising sea level submerges wetlands and dry land, erodes beaches, and exacerbates coastal flooding.
Explanation: