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.
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.
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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:
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
Which of the following is NOT a reason why
mathematics is valuable in science?
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.
.
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.
An advertising balloon shaped like a giant soda can is 15 feet tall and 7 feet wide. How many cubic feet of helium will be needed to fully inflate the balloon?
Answer:
576.975 cubic feet of helium will be needed to fully inflate the balloon
Explanation:
To determine how many cubic feet of helium will be needed to fully inflate the balloon, we will determine the volume of the balloon.
From the question,
The balloon is shaped like a giant soda can.
A giant soda can is cylindrical.
Hence, we can determine the volume of the balloon shaped like a giant soda can by using the formula for finding the volume of a cylinder.
The formula for finding the volume of a cylinder is
V = πr²h
Where V is the volume of the cylinder
π is a constant (Take π = 3.14)
r is the radius of the cylinder
and h is the height of the cylinder
From the question, the balloon is 15 feet tall and 7 feet wide
Hence,
Height, h = 15 feet
Width = 7 feet
(NOTE: The width of a cylinder is the same as the diameter)
Then, diameter = 7 feet
Radius, r is given by
Radius = Diameter / 2
Then, Radius = 7 feet / 2 = 3.5 feet
∴ Radius, r = 3.5 feet
Now, for the volume of the balloon,
V = πr²h
V = 3.14 × (3.5)² × 15
V = 3.14 × 12.25 × 15
V = 576.975 cubic feet
This is the volume of the balloon.
Hence, 576.975 cubic feet of helium will be needed to fully inflate the balloon.
Which accident will be more damaging, collision between two trucks
moving with a speed 50 km/hr or collision between two cars moving with a speed of 50 km/hr? Explain.
Answer:
collision between truck
Explanation:
Answer. Collision between trucks, because more is the mass, more is the inertia and therefore more is the momentum. Mass of the trucks is more than that of cars so collision of trucks will cause more damage.
An object is released from rest near a planet's surface. A graph of the acceleration as a
function of time for the object is shown for the 4s after the object is released. The
positive direction is considered to be upward. What is the displacement of the object after 2s?
Answer:
The displacement and direction of the body after 2 seconds is 10 meters downwards
Explanation:
The given information are;
From the graph, the acceleration, is seen as the horizontal line that starts from the y-coordinate, y = -5 m/s²
Therefore;
The acceleration of the body after it was released from rest = -5 m/s² with an upward direction;
Which gives, the acceleration of the body downwards = Opposite sign to the acceleration of the body upwards = 5 m/s²
The displacement, s, of the body after 2 seconds is given by the following equation of motion;
s = u·t + 1/2·a·t²
Where;
u = The initial velocity of the body = 0 m/s
t = The time duration of the displacement = 2 s
a = The acceleration of the body = 5 m/s², downwards
Therefore, by substituting the values, we have;
s = 0 × 2 + 1/2 × 5 × 2² = 10 meters
s = 10 meters
The displacement of the body after 2 seconds = 10 meters
Given that the direction of the displacement and the direction of the acceleration are the same, we have;
The displacement and direction of the body after 2 seconds = 10 meters downwards.
The displacement of the object moving downwards is 10 m.
The given parameters;
time of motion of the object, t = 2 sacceleration of the object constant = -5 m/s²The displacement of the object moving downwards (negative direction) is calculated using the second kinematic equation as shown below;
s = ut - ¹/₂at²
s = 0 - 0.5 x (-5) x (2)²
s = 10 m
Thus, the displacement of the object moving downwards is 10 m.
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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.
it takes 1.4 minutes for Jonny to get to class which is a distance of 82 meters away s. what is Johnny’s average speed in seconds?
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:
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
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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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.
Help ASAP plsssss:///
Answer:
c
Explanation:
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! :)
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 :)
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...........
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
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.
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
Physical Science is the study of
Answer:
Physical science is the study of the inorganic world. That is, it does not study living things. (Those are studied in biological, or life, science.) The four main branches of physical science are astronomy, physics, chemistry, and the Earth sciences, which include meteorology and geology.
Explanation:
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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What is the IMA of the following pulley system?
Answer:
5
Explanation:
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 of the following is a common ground water contaminant
A.ozone
B.nuclear waste
C.carbon monoxide
D.fertilizers
A square sheet of rubber has sides that are 20 cm long. If you stretch it so that the area of the rubber is four times larger, how
long is each of the sides now?
Each side = ____cm
Answer:
40
Explanation:
The area is 400cm^2 but the area on each side is 40cm.
A 1-kg mass is dropped from a third floor window. The acceleration of the mass is found to be 8 m/s2. What is the average force of air resistance? A) 1.8 N B) 7 N C) 8 N D) 9.8 N