Answer:
Answer in Observational evidence (b)
The evidence needed to formulate a hypothesis is observational evidence. From keen observations, we are formulating a scientific hypothesis.
What is hypothesis ?Hypothesis is a plausible scientific statement which predicts a process or result of an experiment based on observations. Hypothesis can be made from well established scientific records also.
Some are formulating hypothesis based on some intuitions, while some others are formulated based on inductions or deductions. An experiment starts from a clear cut hypothesis.
A hypothesis must be testable, falsifiable. A scientific hypothesis must be based on a strict observation and for a considerable time and the observations must support for the statement derived for the solution.
Hence, the evidence is needed for a or a hypothesis to be supported or not supported is observational evidence.
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in the Newton's Third Law of Motion state three characteristics
Answer:
Newton's third law: If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A. This law represents a certain symmetry in nature: forces always occur in pairs, and one body cannot exert a force on another without experiencing a force itself.
Who exerts more pressure? a) A girl of 50 kg, wearing heels with an area of 1 cm2. b) An elephant of 4000 kg with foot area of 250 cm2.
Answer:
The girl exerts more pressure.
Explanation:
Pressure can be defined as the force exerted normally or perpendicularly per unit area.
i.e P = F/A
Girls
Area of the heel = 1cm² = 10^(-4) m²
Force = mg = 50 × 10 = 500N
Pressure =
[tex] \frac{500}{10 ^{ - 4} } [/tex]
[tex] = 5 \times {10}^{6}[/tex]
Elephant
Area = 250cm² = 2.5 x 10^(-2)b m²
Force = mg = 40000N
Pressure =
[tex] \frac{40000}{2.5 \times {10}^{ - 2} } [/tex]
[tex] = 1.6 \times {10}^{6} [/tex]
ОООО
A dog runs from his home & goes 400 m around the block before reaching back home. What is the dog's total distance & displacement?
Distance: 0 m & displacement: 400m
Distance: 400 m & displacement:0m
Distance: Om & displacement:4 m
Distance: 4 m & displacement: Om
Answer:
A dog runs from his home & goes 400 m around the block before reaching back home. What is the dog's total distance & displacement?
Distance: 400 m & displacement:0m
Explanation:
Option B is the answer.
Hope it helps.
Between which types of elements do ionic bonds occur, and how do electrons act within the bond
o nonmetals and nonmetals, electrons shared
o metals and metals, electrons freely moving
O metals and nonmetals, electrons transferred
nonmetals and metals, electrons shared
Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.
the real answer is
O metals and nonmetals, electrons transferrednonmetals and metals, electrons shared
How are the oscillating magnetic and electric fields of an electromagnetic wave positioned relative to each other?
A) They are parallel to each other.
B) The magnetic field is rotated 45° from the electric field
C) the electric field is rotated 45° from the magnetic field.
D) They are perpendicular to each other
Answer:
D.
for the scalar product between two vectors to be 0 either one of thm is zero vector or they are perpendicular to each other
After the experiment, scientists organize and (blank) the data.
Does anyone know what goes in the blank? Im doing a crossword puzzle and I need help, please. (/w\)
Answer:
analyze
Explanation:
A car travels a distance of 65 km. For the first 30 minutes, it is driven at a constant speed of 70 km/hr. The motor begins to vibrate and the driver reduces the speed to 20 km/hr for the rest of the trip. The average speed for the entire trip is?
Answer : 53.3 km/hr.
explanation
If the density of a liquid is 20gcm - 3 height is 4cm and gravitational field strength is 10 N kg, the pressure of the liquid is
Answer:
Pressure is 1.96 × 10^12 Pa
Explanation:
[tex]{ \bf{pressure = \frac{force}{area} }}[/tex]
height = 4 cm = 0.04 m
density = 20 g/cm³ = 20,000 kg/m³
But for force:
[tex]{ \sf{force = mass \times acceleration}} \\ { \sf{force = ( \frac{density}{volume} ) \times acceleration}} \\ \\ { \sf{force = ( \frac{20000 }{0.04 {}^{3} }) \times 10 }} \\ \\ { \sf{force = 3.13 \times {10}^{9} \: newtons}}[/tex]
For area:
[tex]{ \sf{area = 0.04 \times 0.04 = 0.0016 \: m {}^{2} }}[/tex]
[tex] { \tt{pressure = \frac{3.13 \times {10}^{9} }{0.0016} }} \\ \\ = { \tt{1.96 \times {10}^{12} \: pascals}}[/tex]
Metallic bonds are responsible for many properties of metals, such as conductivity. Why is this possible?
Answer:
The bonds can shift because valence electrons are held loosely and move freely.
Explanation:
Ill put the rest of the answers in the comments
Answer:
The bonds can shift because valence electrons are held loosely and more freely.
HELP!!!
Explain how magnetic potential energy can be transformed into kinetic energy.
Potential energy converts kinetic energy when the range is shifting from the S pole to the N pole.
If you like, I can put in more detail!
Plsss helppp me I have a lot of questions pls help me I will mark brainliest!!!
Answer:
kilo means 1000
2a. 0.1
b. 100
c.0.01
d. 0.001
3a.km
b.mL
d.cg
e.mm
g. g
h.kL
What is the kinetic energy of a bicycle with a mass of 16 kg traveling at a velocity of 5 m/s
Answer:
200J
Explanation:
K.E=½mv²
K.E=½×16kg×5m/s²
K.E=8kg×25
K.E=200J
what will happen to the gravitational force between two bodies if the distance between them is halved keeping their masses constant
help me
Answer:
if the distance between them is halved then gravitational force will be doubled....
Which of the following is true about scientific laws?
Answer: Scientific theories are never proven.
Explanation:
If a 2kg metal slug is heated with 1275J of energy which raises its temperature 15K, what is the metal's specific heat capacity?
Answer:
42.5J/kgk
Just use the formula
C = Q/m x change in temp
-. JC=BFF© cough medicine is marketing its' new medicine called "Devil Red". They
want to know why religious customers seem to avoid their product.
Religious customers seem to avoid their products because;
they have a negative view and understanding of the name "Devil."When selling a product to potential customers, the brand name of that product could affect sales negatively or positively.
Religious people do not view the devil in a positive manner because they believe that he is responsible for the suffering in the world.
The already existing bias they have in their minds about that name will make them reject any product bearing the name. They might even reason that this medicine will worsen their sickness. For this reason, the medicine called "Devil Red" will have a poor reception by religious people.
Summarily, religious people avid the medicine called Devil Red because they have a negative view of the devil.
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what is the difference between the two reactions that can occur during radioactive decay?
what are gamma rays and what are its uses??
"Gamma rays" is the name that we call the shortest of all electromagnetic waves. They're shorter than radio waves, microwaves, infrared waves, heat waves, visible light waves, ultraviolet waves, and X-rays. They extend all the way down to waves that are as short as the distance across an atom.
Being so short, they carry lots of energy. They can penetrate many materials, and they can damage living cells and DNA. They're dangerous.
The sun puts out a lot of gamma radiation. The atmosphere (air) filters out a lot of it, otherwise there couldn't even be any life on Earth.
As soon as astronauts fly out of the atmosphere, they need a lot of shielding from gamma rays.
You know the precautions we take when we're around X-rays. The same precautions apply around gamma rays, only a lot more so.
It's only in the past several years that we've learned how to MAKE gamma rays without blowing things up. Also, how to control them, and how to use them for medical and industrial applications.
Explanation:
Gamma rays are ionizing electromagnetic radiation, observed by the decay of an atomic nucleus.
Uses of gamma rays :
Sterilize medical requirements. Sterilize food Used as traces in medicine Gamma ray astronomy.how is light reflected from a prism
Answer:
White light entering a prism is bent, or refracted, and the light separates into its constituent wavelengths. Each wavelength of light has a different colour and bends at a different angle. The colours of white light always emerge through a prism in the same order—red, orange, yellow, green, blue, indigo, and violet.
A 10cm tall object is placed perpendicular to
the principal axis of a convex lens of focal length
30cm. The distance of the object from the line is
20cm.find the i)position ii)nature and iii) size of
the image formed.
My answer is in the picture
Swipe the pictures to see the others
Math is used in the sciences because (1 point)
A numbers are the best way to understand scientific ideas.
B it is a universal means of communicating scientific information.
C scientific data is quantitative.
D scientific data requires significant figures.
Which option is the appropriate scientific unit for distance?
A) Foot
B) meter
C) mile
D) yard
Which tools do investigations in Earth and space science use?
A) computer and field
B) internet and laboratory
C) computer, laboratory and field
D) computer, internet, laboratory, and field
Answer:
1. it is universal means of communicating scientific information
2. meter
3. computer, internet, laboratory, and field
State which type of variable is plotted on the x-axis
and which type is plotted on the y-axis.
Answer:
Often the independent variable is plotted on the x-axis - and example might be time (an experiment where time is measured by a watch or an independent mechanical device)
The dependent variable is often plotted on the y-axis - and example here might be the velocity or the acceleration,
It may be the responsibility of the experimenter to determine the value of the dependent variable by some type of measurement
d) All of the
The volume of solid is measured in
a) Litters
b) Grams
c) Cubic centimeters
d) All of the above
a) Liters ... It COULD be. The "Liter" is a perfectly good unit of volume, but it's typically used for liquids and gases, not solids.
b) Grams ... definitely NOT. The "gram" is a unit of mass, not volume.
c) Cubic centimeters ... Yes. This is a unit of volume.
d) All of the above ... No.
The volume of solid is measured in
a) Litters
b) Grams
c) Cubic centimeters
d) All of the above
Which statement is true?
A. When a gas condenses to a liquid, it absorbs energy.
B. When water boils, it releases energy.
C. When ice melts, it absorbs energy.
D. When water freezes, it absorbs energy.
Explanation:
The correct answer is option B
Answer:
C. When ice melts, it absorbs energy.
Explanation:
When ice melts, it is getting hotter by absorbing energy and changes from a solid to a liquid. This is an endothermic reaction.
Nikki has a momentum of 45 Kilogram meters per second and a mass of 30 Kilograms. What is her velocity?
Answer:
45/30
Explanation:
bbsksksbsnbksbsksbs
Nikki has a momentum of 45 Kilogram meters per second and a mass of 30 Kilograms. then her velocity would be 1.5 meters per second
What is momentum?It can be defined as the product of the mass and the speed of the particle, it represents the combined effect of mass and the speed of any particle, and the momentum of any particle is expressed in Kg m/s unit.
Mathematically the formula of the momentum is
P = mv
where P is the momentum of the particle
m is the mass of the particle
v is the velocity by which the particle is moving
As given in the problem Nikki has a momentum of 45 Kilogram meters per second and a mass of 30 Kilograms
P = 45 Kilogram meters per second
m = 30 Kilograms
By substituting the values of the momentum and the mass in the formula of the momentum
P = mv
45 = 30 ×v
v = 45/30 meters per seconds
v = 1.5 meters per seconds
Thus, Nikki weighs 30 kilograms and moves at a 45 kilogram per the second momentum. subsequently, her velocity would be 1.5 meters per second.
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pls help question are in the picture
The larger the number of charges flowing through the wire, the larger is the ____________ flowing in the wire.
Answer:
The larger the number of charges flowing through the wire,the larger is the current flowing in the wire.
Explanation:
if the wire is large then large amount of current flows through the circuit.but if the wire is small then a smaller amount of current will pass through.
I hope this helps
plzz can anyone solve this
plzzzz guys tomorrow is my exam ..
plzz
Answer:
i hope it helped U
stay safe stay happy
0.054x2.33x90............
please mark this answer as brainlist
an experiment involving the scientific method begins with a/an:
Answer:
Step 1. Make observations.
Step 2. Form a hypothesis.
Step 3. Make a prediction.
Step 4. Perform an experiment.
Step 5. Analyze the results of the experiment.
Step 6. Draw a conclusion.
Step 7. Report your results.
Explanation:
The first step in the Scientific Method is to make objective observations. These observations are based on specific events that have already happened and can be verified by others as true or false. Step 2. Form a hypothesis.
Our observations tell us about the past or the present. As scientists, we want to be able to predict future events. We must therefore use our ability to reason.
Scientists use their knowledge of past events to develop a general principle or explanation to help predict future events. The general principle is called a hypothesis. The type of reasoning involved is called inductive reasoning (deriving a generalization from specific details).
A hypothesis should have the following characteristics:
• It should be a general principle that holds across space and time
• It should be a tentative idea
• It should agree with available observations
• It should be kept as simple as possible.
• It should be testable and potentially falsifiable. In other words, there should be a
way to show the hypothesis is false; a way to disprove the hypothesis.
Some mammals have two hind limbs would be a useless hypothesis. There is no observation that would not fit this hypothesis!
All mammals have two hind limbs is a good hypothesis. We would look throughout the world at mammals. When we find whales, which have no hind limbs, we would have shown our hypothesis to be false; we have falsified the hypothesis.
When a hypothesis involves a cause-and-effect relationship, we state our hypothesis to indicate there is no effect. A hypothesis, which asserts no effect, is called a null hypothesis. For instance, the drug Celebra does not help relieve rheumatoid arthritis.
