Answer:
In space noone can hear you scream.....
Explanation:
There is no sound in space. Sound, like light or heat, is a wave. However, one major distinction is that, unlike light or heat (radiation), sound needs a medium to travel. Sounds require the presence of molecules or particles to travel from one region to another.
I NEED HELP!!!! THIS IS DUE TODAY OCT. 14, 2020 AT 11:59 PM!!!
Keisha has two large dogs and a small dog. The dogs like to play tug-the-rope together. Each of these three diagrams shows one way that the dogs play together with the rope. Look at each arrow and the number that goes with it. They show the direction and amount of force each dog exerts on the rope. There are three illustrations of two dogs pulling at a toy rope.
The left art should show two big dogs pulling on a rope toy each pulling with a force of 20N in the opposite direction. The middle art shows a big dog on left pulling to the left on the rope toy with a force of 20N and a little dog pulling to the right with a force of 12N. The right art shows the rope toy tied to a post, with both dogs pulling on different parts of the toy and in the same direction. One large dog pulls with a force of 20 N and the small dog pulls with a force of 12 N.
Explain whether the forces shown in each diagram are balanced or unbalanced. Use math-based evidence to support your claim for each diagram.
Answer:
The answer is unbalanced
Explanation:
Though cases like these are not really how the science will be used, they illustrate the principle.
If the left art shows two big dogs pulling on a rope toy each pulling with a force of 20N in the opposite direction. The middle art shows a big dog on left pulling to the left on the rope toy with a force of 20N and a little dog pulling to the right with a force of 12N. The right art shows the rope toy tied to a post, with both dogs pulling on different parts of the toy and in the same direction. One large dog pulls with a force of 20 N and the small dog pulls with a force of 12 N. The atomic theory has been of priceless value to chemists, but it has more than once happened in the history of science that a hypothesis, after having been useful in the discovery Present and the co-ordination of knowledge, has been aban- position doned and replaced by one more in harmony with later of the discoveries
The amount of force exerted in each direction in the rope determines if the force in play is balanced or unbalanced ;
Left art : 20N = 20N (Balanced) Middle : 20N > 12N (Unbalanced) Right art : 20N > 12N (Unbalanced)To determine if the force acting in two direction is balanced or unbalanced, we calculate the net force acting on the object.
The net force = Force 1 - Force 2If the netforce = 0 ; then the force is balanced, if otherwise , then it is unbalanced.
Left art :
Net force = 20N - 20N = 0 NRight art :
20N - 12N = 8N (direction of the 20N force)Middle :
20N - 12N = 8N (direction of the 20N force)Therefore, the value of the net force determines if the force is balanced or not.
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A lithium atom has 3 protons, 4 neutrons and 3 electrons. How would the atom change to become a cation? How would the atom change to become an anion?
Answer:
- For the lithium ion to change to become an anion, it will have to gain one or more electrons which can be pulled away from possibly other atoms with a weaker affinity for them.
- For the lithium ion to change to become a cation, it will have to loose one or more electrons which can be drawn by other atoms with a stronger affinity for them.
Explanation:
Generally, an anion has a net negative charge arising from the fact that it has more electrons than protons while a cation has a net positive charge arising from the fact that it has more protons than electrons.
Now, for the lithium ion to change to an anion, it means it has to have more electrons than it's protons. Thus, since it has 3 number each of protons and electrons, it will have to gain one or more electrons which can be pulled away from possibly other atoms with a weaker affinity for them.
Now, for the lithium ion to change to a cation, it means it has to have more protons than it's electrons. Thus, since it has 3 number each of protons and electrons, it will have to loose one or more electrons which can be drawn out by possibly other atoms with a stronger affinity for them.
A biker starts moving from rest with a constant acceleration of 2.0 m/s^2. What is his velocity after 5.0 s?
a = v-u/t
2 = v - 0 / 5
2 = v/5
v = 10 m /s
an antonym of lithium (Li) forms and an iconic bond with atom of chlorine CI to form lithium chloride. how are the valence electrons of these atoms rearranged to form this Bond ?
Li , which is located in group 1 of the periodic table, has one valence electron.
Chlorine, which is in group 17 of the periodic table, has seven valence electrons.
When the two atoms bond, lithium will lose one electron and form the lithium cation, Li + .
Since it loses one electron 7-1 = 6, there will be 6 valence electrons.
Why do you think history is often referred to as social science
Answer:
History is considered to be a hybrid of the humanities and social sciences. This is because it uses the tools and methods of both.
Please, can any one help
Answer:
a = 1.458 [m/s²]
Explanation:
To be able to solve this type of problems it is always advisable to make a free body diagram with the forces acting on the body.
Attached is an image with the free body diagram and the proposed equations, the explanation of obtaining the equations will be described below.
Let's take the movement to the left as positive, i.e. all forces going to the left have a positive sign.
Let's use Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration.
To the left we have the two forces of tension by the cosine of the angle. And to the right the frictional force. The resultant of these forces is equal to the product of the mass (mass of the child plus the mass of the sled), by acceleration.
If a car travels 10 km north and then 10 km west, what is the MAGNITUDE of
displacement?
Answer:
The magnitude of the displacement is [tex]H = 14.14 \ km[/tex]
Explanation:
From the question we are told that
The distance of the car to north is d = 10 km
The distance of car to the west is w = - 10 \ km
The negative sign is because the direction is west
Generally applying Pythagoras theorem , the displacement is
[tex]H = \sqrt{d^2 + w^2}[/tex]
=> [tex]H = \sqrt{(10)^2 + (-10)^2}[/tex]
=> [tex]H = 14.14 \ km[/tex]
A planned high-speed train between Houston and Dallas will travel a distance of 386 kilometers in 5.40 × 10^3 seconds. What is the average speed of this train?
¡Hellow!
For this problem, first, lets convert the seconds in hours:
5,4x10³[tex]\rightarrow[/tex] 5400
h = sec / 3600
h = 5400 s / 3600
h = 1,5
Let's recabe information:
d (Distance) = 386 km
t (Time) = 1,5 h
v (Velocity) = ?
For calculate velocity, let's applicate formula:
[tex]\boxed{\boxed{\textbf{d = v * t} } }[/tex]
Reeplace according we information:
386 km = v * 1,5 h
v = 386 km / 1,5 h
v = 257,33 km/h
The velocity of the train is of 257,33 kilometers for hour.
Extra:
For convert km/h to m/s, we divide the velocity of km/h for 3,6:
m/s = km/h / 3,6
Let's reeplace:
m/s = 257,33 km/h / 3,6
m/s = 71,48
¿Good Luck?
Calculate the kinetic energy of a truck that has a mass of 2900 kg and is moving at 55 m/s.
Answer:
2900 divided by 55 is 52.727272727272727
Which statement best describes how waves carry energy?
O Energy moves from one place to another through the wave.
O Energy increases as it moves through the wave.
Energy is completely consumed by the beginning of the wave.
Energy builds through the wave and is released at the end.
Ο Ο
Answer:
Energy moves from one place to another through the wave. answer A
A wave is a disturbance that transmit energy. Thus, the correct statement is energy moves from one place to another through the wave.
What is a wave?A wave is a disturbance that transfers energy as it moves from one point to another.
Different terminologies are used to characterise a wave as it travels. Some of these include
Wave speed Wave crest Wave Frequency Wave Period Wavelength Wave troughAmplitude etcConsidering the question given above, we see clearly from the definition of wave that the energy is transferred as the wave is moving.
Thus, we can conclude that the correct answer to the question is energy moves from one place to another through the wave
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A book with a mass of 1.5 kg rests on the edge of a desk 0.75 m above the
floor. Given that the acceleration due to gravity is 9.8 m/s2, what is the book's
potential energy?
apex
Answer:
11.03 J
Explanation:
did it on a p e x
define the term specific heat capacity of a substance and state its unit
Answer:
Hope this help
Explanation:
Specific heat capacity,c of a substance is the quantity of heat needed to raise the temperature of 1 kg mass of the substance by 1°C
Unit for c is J/kg/°C or J/kg/K
Who is the founder of microscope?
Answer:
Zacharias Janssen
Explanation:
Answer:
Zacharias Janssen;
Explanation:
Zacharias Janssen; also Zacharias Jansen or Sacharias Jansen; 1585 – pre-1632 was a Dutch spectacle-maker who lived most of his life in Middelburg. He is associated with the invention of the first optical telescope and/or the first truly compound microscope, but these claims may be fabrications put forward by his son
hope this helps
The boundary between areas of high and low pressure:
A Front
B Barometer
C Weather
D Air pressure
Pls help
Tarnish is produced by a redox reaction that occurs when a metal reacts with a nonmetallic compound. The black tarnish on a silver dish might be produced by a reaction between silver and hydrogen sulfide. What occurs during this reaction?
A. Silver atoms lose electrons to sulfur atoms.
B. Silver atoms gain electrons from sulfur atoms.
C. A double-replacement reaction takes place
D. An acid-base reaction takes place.
Answer:
A. Silver atoms lose electrons to sulfur atoms
Explanation:
:p
Answer:
AA
Explanation:
A boat sends a sound to the bottom of the ocean and it takes 3 seconds to return to the boat. How deep in the ocean? The speed of sound on water is 1500m/s.
Answer:
2,250 meters deep
Explanation:
If the time taken for the the signal to return to the boat means that it took 3 seconds for the signal to travel to and from the floor the same distance. That means it took 1.5 seconds to travel to the floor at a speed of 1500m/s means that it is 1500 multiplied by 1.5 to a distance of 2,250m. (Derived from the speed = distance divided by time formula to distance = speed multipled by time)
what is Newton's second law?
F=mXa
a=F/m
m=F/a
All of the above
It should be the first one, F= mXa (F = m times a).
What is hybridization plsssss help,i will give brainliest to de person who explains well
Answer: the process of an animal or plant breeding with an individual of another species or variety
Explanation:
there you go
Answer:
In chemistry, orbital hybridization (or hybridization) is the concept of mixing atomic orbitals into new hybrid orbitals (with different energies, shapes, etc., then the component atomic orbitals) suitable for the pairing of electrons to form chemical bonds in valence bond theory.
Explanation:
just copied it :|
PLEASE HELP IT IS URGENT! NET FORCE
Using our knowledge of physics... If we know that the moving man travels 10 meters, has an initial velocity of 0 m/s and an acceleration of 1 m/s, use the equation d = vi t + 1/2 a t^2 to solve for time.
Answer:
t= 4.5s
Explanation:
vi=0m/s
a= 1m/s
d=10m
10m= 0(t) + 1/2(1m/s)(t^2). 0xt cancels out, 1/2 of 1= .5
10m= .5m/s(t^2) Divide both sides by .5
20m= t^2. Take square root of each side
Square root of 20 is 4.472135954999579
sig figs, t= 4.5 s
A car traveling at 7 m/s accelerates at 2.5 m/s^2 to reach a speed of 12 m/s. How long does it take for this acceleration?
Answer:
1s
Explanation:
v=u+at
12=7+2.5t
t=12-7/5
t=1s
If a force of 20 N is applied to a mass of 5 kg, what is the acceleration?
Answer:
4 m/s^2
Explanation:
To get the acceleration you are going to use the acceleration formula which is
Acceleration= Force/Mass.
You then do the math which is 20/5, which equals 4
Therefore you get a value of 4. You may be asking what the units are. The units of acceleration are m/s^2 (meters per second squared)
So your final answer is 4 m/s^2
When are island-arc volcanoes formed?
Answer:
Its the result from subduction of an oceanic tectonic plate when its under another tectonic plate. Sometimes parallel the oceanic trench. Also if a volcano is offshore, it forms islands, which will result in a volcanic type of island arc.
Explanation:
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What are the two parts of an atom? the nucleus and the proton coud the neutron and the electron the neutron and the proton cloud the nucleus and the second 00
Answer: The Nucleus and the Electrons are the 2 Parts of the atom.
Explanation:
Pete is driving down 7th street. He drives 550 meters in 8 seconds. Assuming he does not
speed up or slow down, what is his speed in meters per second
Answer:
Speed = 68.75m/s
Explanation:
Speed can be defined as distance covered per unit time. Speed is a scalar quantity and as such it has magnitude but no direction.
Mathematically, speed is given by the equation;
[tex]Speed = \frac{distance}{time}[/tex]
[tex]S = \frac{d}{t}[/tex]
Given the following data;
Distance = 550m
Time = 8secs
Substituting into the above equation;
[tex]S = \frac{550}{8}[/tex]
Speed, S = 68.75m/s
Newton's second law of motion is also known as
a) quantitative law of motion
b) quantitative law of force
c) qualitative law of motion
d) qualitative law of force
Answer:
Newton's second law of motion is quantitative law of force . Newton's first law of motion is qualitative law of force.
A recipe for a casserole calls for 1 cup of milk. If a chef currently has 0.5 gallons of milk, how many casseroles can the chef make?
Answer:
The chef can make 8 casseroles
Explanation:
Units Conversion
We need to recall 1 gallon = 16 US cups.
A casserole needs 1 cup of milk, and the chef has 0.5 gallons of milk. Those 0.5 gallons are equivalent to 0.5*16 = 8 cups, thus the chef can make 8 casseroles.
You toss an apple across the room to a friend. Which of the following
statements is true about the apple at the top of its trajectory?
I believe the answer is C, but im not sure.
Explanation:
Answer:
its vertical component of its velocity is zero
Explanation:
Knowing that 1 inch is equal to 2.54 centimeters, convert 287 cm to inches.
Answer: 112.992
Explanation: If you divide 287 by 2.54, you will get 112.992125984. I just got rid of the five numbers after 992.
1 inch = 2.54 cm
?= 287 cm let, ? be (a)
cross multiply
2.54a= 1×287
a= 287/2.54
a= 112.992126
therefore 287 cm = 112.992126 inches.
Help please and explain elaborately thanks in advanced
Answer:
So overall, motion and interference of matter are needed equally for friction, which is held together by the force of gravity. Without gravity, everything would have fly away in the universe, and the friction would not have exist. Hence, friction is dependent on gravity.
Elaborately means in a detailed and carefully arranged manner.
Explanation:
hope this helps!!!!