4.58 m/s
Speed = displacement / time
Cosmologists are scientists who study stars, galaxies, black holes, and other objects in the universe. In order to study the billions and billions of stars, cosmologists use highly advanced telescopes and create computer models to trace the stars’ motion.
What is one type of limitation that requires cosmologists to use these telescopes?
A.money
B.time
C.the size of the system
D.ethical concerns
Answer:
a
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The answer is D, ethical concerns.
Good luck on the Unit Test, fellow edge.nuity user.
A truck covers 40.0 m in 7.10 s while uniformly slowing down to a final velocity of 2.05 m/s.
(a) Find the truck's original speed. _______ m/s
(b) Find its acceleration. __________ m/s^2
Answer:
(A) Original speed= 9.22 m/s
(B) Acceleration= -1.0099 m\s^2
Explanation:
A truck covers 40m in 7.10 secs
The truck slows down at a uniform velocity of 2.05 m/s
(A) The original speed can be calculated as follows
Vo= 2(40)/7.10 - 2.05
= 80/7.10 - 2.05
= 11.2676 - 2.05
= 9.22m/s
(B) The acceleration can be calculated as follows
a= Vf-Vo/t
= 2.05-9.22/7.10
= -7.17/7.10
= -1.0099m/s^2
A ball thrown vertically upward is caught by the thrower after 4.00 sec. Find the initial velocity of the ball and the maximum height it reaches.
Answer:
Initial velocity = 39.2m/s
Maximum height is 78.4m
Explanation:
Given
[tex]Time, t = 4s[/tex]
Solving (a): Initial Velocity
Using first law of motion:
[tex]v = u + at[/tex]
Where
[tex]v = final\ velocity = 0[/tex]
[tex]u = iniital\ velocity = ??[/tex]
[tex]a = acceleration = -g[/tex] [g represents acceleration due to gravity]
[tex]t = 4[/tex]
Substitute these value in the above formula:
[tex]v = u + at[/tex]
[tex]0 = u - g * 4[/tex]
[tex]0 = u - 9.8 * 4[/tex]
Take g as 9.8m/s²
[tex]0 = u - 39.2[/tex]
[tex]u = 39.2m/s\\[/tex]
Hence, initial velocity = 39.2m/s
Solving (b): Maximum Height
This will be solved using second equation of motion
[tex]s = ut + \frac{1}{2}at^2[/tex]
This becomes
[tex]s = ut - \frac{1}{2}gt^2[/tex]
Substitute values for u, t and g
[tex]s = 39.2 * 4 - \frac{1}{2} * 9.8 * 4^2[/tex]
[tex]s = 156.8 - 78.4[/tex]
[tex]s = 78.4[/tex]
Hence, the maximum height is 78.4m
PLEASE ANSWER FAST!!What was significant about the clay samples from the Western Hemisphere? How was the Alvarez hypothesis modified in response?
Answer:
The Western Hemisphere contained significantly higher amounts of shock-fractured quartz. This led Walter and Luis Alvarez to hypothesize that the asteroid impact site was in the Western Hemisphere.
Explanation:
Please Answer: Which lists the waves in order of frequency, from highest to lowest? A.X-rays, gamma rays, ultraviolet B.radio waves, visible light, X-rays C.ultraviolet, microwaves, gamma rays D.visible light, infrared, microwaves
Answer:
D.visible light, infrared, microwaves
Explanation:
Answer:
visible light, infrared, microwaves
Explanation:
from highest to lowest
How many ways (directions) can an object move in 1 Dimension? Can it be still? Can it speed up or slow down?
Explanation:
Let's assume the 1D is along x - axis.
Then, the object can move in two directions, along +x axis or - x axis, depending upon reference point .
Yes, it can be still, speed up and slow down.
During an experiment, a student moved a cell from pure water to salted water. What will most likely happen to the cell?
Answer:
During an experiment, a student moves a cell from pure water to salted water. ... It will release water and shrivel. It will release water and burst.
What do the planets have in common and how are they different?
Answer:
They vary quite a lot, yet there are some similarities
Explanation:
With Mercury, you have a hot and barren expanse of rock
With Venus, you also have a fairly hot and barren expanse of rock, with a molten core
With Earth, you have a warm/cool variant with water and a full atmosphere
With Mars, you have a colder and barren expanse of valleys and rock, with a rather paste-like ground
With Jupiter, we have our first gas giant, covered in clouds with a thick atmosphere
With Saturn, it is yet another gas giant, with rings of gas and rock and a dense core of metals, such as iron and nickel
With Uranus, it is also rather gas-full with a fair amount of water and methane, which results in its bluish color (an ice giant)
And finally with Neptune, it is the other ice giant, consisting of water, methane, and ammonia
So there are some similarities (gases, water, land formations, etc.) and some differences (rings, temperature, structure, etc.). Our planets are very unique to one another and continue to engage and surprise us.
convert 288cm to Meters
Give explanation + formula
Answer:
288 cm is 2.88 meters. This is because each centimeter is 1/100th of a meter, or in other words, each meter is 100 cm. To find out cm-m, divide the amount of cm by 100 and change the unit to m.
Explanation:
formula is cm/100=m
288/100= 2.88m
.
In Thomson's plum pudding model of the atom where is the positive
charge, in the plums or in the dough which surrounds them?
Enter the answer
What’s the answer
Answer:
Positive charge is in the dough in which the negatively charged plums are embedded.
Three balls are used to model the Sun-Earth-Moon system. Which statement describes a benefit of this model?
Options are not given in the question, so the complete question is as follows:
Three balls are used to model the Sun-Earth-Moon system. Which statement
describes the benefit of this model?
A. The model shows only how eclipses happen.
B. It shows information about a system too large to be studied easily.
C. It shows information about a system too fast to be studied directly
D. The model can be used for the entire solar system.
Answer:
B. It shows information about a system too large to be studied easily.
Explanation:
The use of balls in the model makes it easy to understand the large solar system.
The solar system is comprised of the sun, moon, planets, and other celestial bodies. The model using three balls makes it easy to understand a large system. Using these balls many things about the solar system can be learned such as the position of the Sun-Earth-Moon, the phenomenon of rotation and revolution, and eclipses.
So, the given models show that a large solar system can be studied easily.
Hence, the correct option is "B".
Answer:
B. It shows information about a system too large to be studied easily.
Explanation:
Joe walked 1200m East and then turned and walked 600m West. Which statement is true about Joe’s walk
Answer:
which statement is true about his walk? he walked 1200m then went back 600m
Explanation:
because he walked 1200m east the 600m west so it adds up to 600
what is noncontact force
Answer:
A non-contact force is a force which acts on an object without coming physically in contact with it.
Explanation:
For example:
Gravitational force.
Magnetic force.
Electrostatics.
Nuclear force.
Answer:
Non-contact force are forces that exist(arise) without any form of contact between two objects.
Examples are ;
: Magnetic Force ;is a force that attracts certain metal objects (like iron and iron filings) towards a magnet. Electrostatic Force ;s the force exerted by a charged body on another charged or uncharged bodyGravitational force ; is a force exerted by the earth on all objects on itExplanation:
what are groups of periodic table
Explanation:
there are 8 groups of the periodic table
group number one is of the alkali metals
group number two use of the alkaline Earth metals
group number three is known as group (III)
group number for is known as group IV
group number V is known as group V group number six is known as group VI
group number seven is known as halogens
and group number eight is of the noble gases
the periodic table does not have 18 groups as the elements between group III and group IV all known as the transition metals.
Which part of an amino acid's basic structure gives it its unique functional characteristics? Choose 1 answer: А R-group B Central alpha (a) carbon Carboxyl group (-COOH) Amino group (-NH2)
Answer:
A. R- group
Explanation:
The part of an amino acid's basic structure gives it its unique functional characteristics is R-group.
What is amino acids?Amino acids are smaller molecules that join or combine together through peptide bond to form protein. They are refer to the building block of protein.
Therefore, The part of an amino acid's basic structure gives it its unique functional characteristics is R-group.
Learn more about amino acids below.
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What is the smallest part of a chemical compound that has all the properties
of that compound
A. A nucleus
B. A mineral
C. An atom
D. A molecule
Answer:
D. A Molecule
Explanation:
The smallest particle of a compound that still has the properties of the compound is a molecule. It is composed of two or more bonded atoms.
The smallest part of a chemical compound that has all the properties of that compound is a molecule (option d)
In the world of chemistry, substances are composed of tiny units called atoms, and these atoms bond together to form chemical compounds.
Option A, a nucleus, refers to the central core of an atom and consists of protons and neutrons. While essential for an atom, a nucleus alone does not represent a complete chemical compound.
Option B, a mineral, is a naturally occurring inorganic substance with a specific chemical composition and a definite atomic structure. However, minerals are not the smallest parts of a chemical compound.
Option C, an atom, is the fundamental building block of matter. It consists of a nucleus (containing protons and neutrons) surrounded by electrons. While atoms are crucial for forming compounds, they are not the smallest unit that retains all the properties of a compound.
Therefore, the correct answer is Option D, a molecule. A molecule is a group of two or more atoms bonded together, representing the smallest part of a chemical compound that possesses all the characteristics and properties of that compound.
Hence the correct option is (d).
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an ice cube is placed in the sun later there is a puddle of water later still the.puddle is gone what kind of change has occured
Clear question is;
An ice cube is placed in the sun. Later there is a puddle of water. Later still the puddle is gone. What kind of change has occurred?
Answer:
Physical change.
Explanation:
There are two type of changes called physical change and chemical change.
In Physical changes, there is only change in the appearance of the substance and not its chemical composition. Whereas, in Chemical changes the substance changes entirely into another substance with a new chemical formula.
Now, for the ice cube, it has melted from a solid state to a liquid state. Thus, there is only a change in appearance and not its chemical composition. Thus, it's a physical change that has occurred.
Distance v. Time
What is the velocity at 1 meters?
4.5
4
3.5
3
2.5
Distance (m)
2.
1.5
1
0.5
0
0
2
6
8
10
Time (s)
Answer:
4
(m)
2 ( s )
Explanation:
ok...........
Bacteria prefer a dry environment to a damp or moist environment. False True
Answer:
false
Explanation:
cause bacteria prefers moist and damp environment
Answer:
False
Explanation: bacteria thrive on moister and grow due to it. if the enviroment they were in were to be dry, the bacteria itself would die. Hope this helps! :)
Which of the following is NOT a reason why
mathematics is valuable in science?
Two magnets are placed near each other on a space station orbiting Earth.
Their north poles are facing each other. Which statement explains what will
happen to the magnets?
O A. They will be repelled because they are in each other's magnetic
field.
B. They will not move because they have only half of a magnetic
field.
C. They will not move because they have very small gravitational
fields.
D. They will be attracted because their electric fields will add
together
Answer: A. They will be repelled because they are in each other's magnetic
field.
Explanation: Apex and gravity and electrical don't have effect on magnets magnetic field.
The statement that described the happening to the magnets should be that they will be attracted because they are in each other's magnetic.
What is a magnet?Magnet refers to the piece of iron or other material that comprise of the atoms also it inbuilt the magnetism properties like attraction of other type of iron objects. In the case when the two magnets shoud be placed near to each other also their north poles should be faced each other so it should be attracted since it is considered as the each other magnetic.
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w many significant figures does the following number have: 100.00210
Answer:
Number of Significant Figures: 8
The Significant Figures are 1 0 0 0 0 2 1 0
Explanation:
We have that 100.00210 has a 8 significant figure from the rules of Significant figures
8 significant figure
From the question we are told
How many significant figures does the following number have: 100.00210
Generally
Non zeros Number are significant
Zeros that are before a none zero a not significant
Therefore
100.00210 has a 8 significant figure from the rules of Significant figures
8 significant figure
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1. How many energy levels do the electrons in an atom of iron occupy?
Electrons in atoms occupy energy levels, also called electron shells, outside the nucleus. Different shells can hold different maximum numbers of electrons. The electrons in an atom occupy the lowest available energy level first.on:
Answer:
26. Brainliest?
Explanation:
Iron atoms have 26 electrons and the shell structure is 2.8.
In addition to the idea that Jupiter has moons orbiting it, what other evidence did Galileo use to support Copernicus’s model and disprove Aristotle and Ptolemy?
Answer:
Venus has phases similar to the moon’s phases.
Explanation:
i hope this helped you :)
a car is driving at 57 mi/hr, how long will it take for the car to go 80 mile
Answer:
1 hour 6 minutes and about 6 seconds
2. A ball is dropped from a height of 52 m. The ball falls freely and reaches the ground in 75 s. What was the average speed of the ball?
Answer:
v = 0.69 m/s
Explanation:
Given that,
A ball is dropped from a height of 52 m.
The ball reaches the ground in 75 seconds
We need to find the average speed of the ball. The ball will travel a distance of 52 m in 75 s. The average speed of the ball is distance divided by time taken. So,
[tex]v=\dfrac{52\ m}{75\ s}\\\\v=0.69\ m/s[/tex]
Hence, the average speed of the ball is 0.69 m/s.
A competitive go-cart driver is traveling 32 m/s. He sees a caution flag go up, so he slows at a rate of -1.5 m/s^2 in 10.8 s. What is his final velocity?
Answer:
15.8 m/s
Explanation:
The following data were obtained from the question:
Initial velocity (u) = 32 m/s.
Acceleration (a) = – 1.5 m/s²
Time (t) = 10.8 s.
Final velocity (v) =?
Acceleration is simply defined as the rate of change of velocity with time. Mathematically, it is expressed as:
Acceleration (a) = [final velocity (v) – initial velocity (u)] / time (t)
a = (v – u) /t
With the above formula, we can obtain the final velocity of go-cart driver as follow:
Initial velocity (u) = 32 m/s.
Acceleration (a) = – 1.5 m/s²
Time (t) = 10.8 s.
Final velocity (v) =?
a = (v – u) /t
– 1.5 = (v – 32) / 10.8
Cross multiply
(v – 32) = –1.5 × 10.8
v – 32 = – 16.2
Collect like terms
v = – 16.2 + 32
v = 15.8 m/s
Therefore, the final velocity of go-cart driver is 15.8 m/s.
Help ASAP plsssss:///
Answer:
c
Explanation:
A scientist has two containers. Inside each container, there is a blue liquid. The liquids are substances. What can the scientist do to help find out whether these two liquids are both the SAME substance? *
An airplane flying due north at 90 km/h is being blown due
west at 50 km/h. What is the resultant velocity of the plane?
a
74 km/hr
b 82 km/hr
С
103 km/hr
d 95 km/hr
Answer:
74km/h
Explanation:
Answer:
103 km/hr
Explanation: