Answer:
That the Sun was the center of the universe.
Explanation:
Ptolemy believed in geocentrism, which means that the Earth is the center of the Universe. This was also supported by Aristotle. Copernicus on the other hand believed in a heliocentric system, which proposes that the sun is the center of the universe.
Answer:
Earth rotates on its axis and orbits the sun.
Explanation:
Ptolemy believed earth is stationary and is located at the center of the universe. Every celestial object moves around the earth.
It was easier to assume that the earth is not moving since it appears to be stationary to people dwelling on it and to assume that the celestial objects are actually rotating the earth since they appear to be moving.
This is the perfect example that looks can be deceiving. In the ancient times the circle is believed to be a divine shape since it is perfect and the two major celestial objects, the sun and the moon, moves in a circular path. But it turns out, not everything rotates the earth in circular orbit. So Ptolemy proposed nested circular orbits. Which was so complex and farfetched.
Copernicus, a student of Tycho Brahe, (remember Tycho Brahe is an advocate of geocentric theory) inherited Tycho brahe's records of the movements of mars. He could not explain the retrograde motion of mars within the limits of geocentric theory.
He then suggested to remove the concept of divinity, associated with the earth being the center of all universe and to treat earth like every other celestial object. He was the first ever radical who steered us on the right path. In his heliocentric theory, earth rotates on its axis and orbits the sun. This can explain the retrograde motion of mars very easily
I will mark brainiest!
If your body is wet what is the lowest electrical voltage can be fatal?
A. 100 volts
B. 15 volts
C. 5 volts
D. 10 volts
Applied to the right place in the right way, a 5-volt source can kill a person.
When the human body is wet, its resistance decreases significantly, making it possible for a voltage as low as 10 volts to be fatal. This occurs because the low resistance allows enough current to interfere with heart rhythms. Therefore, the correct answer is 10 volts.
When the human body is wet, its resistance can significantly decrease to approximately 100 ohms. According to Ohm's law, the amount of current (I) that flows through a person depends on the voltage (V) and the resistance (R). For a fatal current, even a small voltage can become dangerous. Generally, it is considered that as little as 10 volts can be fatal as it may drive a current that interferes with heart rhythms. Therefore, the correct answer is 10 volts.
A person walks 2 miles every day to work, leaving her front porch at 7:00 A.M. and arriving at work at 7:30 A.M. ON the way home she walks the same route and ends at her front porch. What is her displacement?
Answer:
The displacement is zero miles
Explanation:
The displacement of an object that moves from point A to point B is defined as
[tex]d =B-A[/tex]
Where d is the displacement of the object. The displacement does not depend on the trajectory of the object. It only depends on the linear distance between the end point and the starting point.
In this case we know that the person walks from home to work and then walks from work to home. Therefore, the total displacement is the linear distance between the point where its journey begins and the point where the route ends.
The tour begins on the front porch of your house and ends on the front porch of your house (when you return from work). If we call A to the front porch of the house then the displacement is:
[tex]d = A-A = 0[/tex]
The displacement is zero miles, since the person finishes the journey just where it started (front porch)
Which best describes accuracy?
A.) the smallness of the graduations on a measuring tool
B.) the reproducibility of a measured value
C.) the dependence of a measured value on a controlled value
D.) the agreement between a measured value and an accepted value
Answer: A.) the smallness of the graduations on a measuring tool
Explanation:
Accuracy is defined as the closeness of the measured value to the actual value. Therefore, out of the options, this is best described by A. the smallness of the graduations on a measuring tool. This is because smaller graduations mean that the value can be measured to a smaller level, making it more accurate. PLEASE GIVE ME BRAINIEST
Identify one organism in the chart that is a decomposer
Answer: Most decomposers are microscopic organisms, including protozoa and bacteria. Other decomposers are big enough to see without a microscope. They include fungi along with invertebrate organisms sometimes called detritivores, which include earthworms, termites, and millipedes.
Explanation:
Maya tried to hit four golf balls into a hole marked with a flag. The diagram shows where the golf balls landed.
Answer:
Explanation: high precision, high accuracy, how did i get it well the golf balls were not accurate but the precision of the balls were all in one place.
Answer:
High precison, low accuracy
Explanation:
What change of state occurs during vaporization?
Answer:
Liquid to gas
Explanation:
When molecules are in the liquid state, they are held together by internal forces of the molecules while moving in a constant motion.Increasing the temperature through heating, will make the molecules move faster and collide at a higher rate because they gain kinetic energy after obtaining the heat.This will loosen the forces holding the molecules together leading to vaporazation.
Please help!!!! discussion Topic
An enormous amount of electricity is created at
power-generating stations and sent across the
country through wires that carry high voltages.
Appliances, power lines, airport and military
radars, substations, transformers, computers, and
other equipment that carries or uses electricity all
generate electromagnetic fields.
Many questions have been raised about how
electromagnetic fields affect our bodies. Do they
pose a public health risk? Perform an Internet
search to find information about the effects of
electromagnetic fields on public health. Then,
discuss the pros and cons of using equipment that
produces an electromagnetic field.
Answer:
Scientists studies have found that the terrestrial electromagnetic environment is actually affecting our health. It is hard to avoid these fields because there are so many things in our life that generate electro magnetic fields. Some of the bioeffects inculde changes in melatonin levels, effects on spatial memory, alteration of intracellular calcium concentration, changes in blood-brain-barrier permeability, enzyme activity, genotoxicity, nonspecific disabilities, and subjective symptoms. Scientists have also found that radiation exposure from mobile phones has been linked with tinnitus, brain tumours, and acoustic neuroma.
The electromagnetic fields have many pros and cons and the human being. Yes, they pose a public health risk.
What is magnetic field?The magnetic field is the region of space where a charged object experiences magnetic force when it is moving.
When current flows through the circuit, the coil gets magnetized. In an electrical circuit , the magnetic field of a straight wire has less magnetic field strength than that of coiled wire.
An enormous amount of electricity is created at power-generating stations and sent across the country through wires that carry high voltages. Appliances, power lines, airport and military radars, substations, transformers, computers, and other equipment that carries or uses electricity all generate electromagnetic fields.
Scientist have discovered that the earthly electromagnetic climate is really influencing our wellbeing. It is difficult to keep away from these fields since there are such countless things in our day to day existence that create electromagnetic fields.
A portion of the bioeffects include changes in melatonin levels, consequences for spatial memory, modification of intracellular calcium fixation, changes in blood-mind hindrance penetrability, chemical movement, genotoxicity, vague handicaps, and emotional side effects. Researchers have additionally found that radiation openness from cell phones has been connected with tinnitus, cerebrum cancers, and acoustic neuroma.
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What is the initial upward velocity of a projectile fired at an angle of 40 m/s at an angle of 20o? A) 2 m/s B) 13.68 m/s C) 14.55 m/s D) 38 m/s
Find the upward velocityt by multiplying the speed by the cos of the angle.
= 40 x cos(20) = 37.588 m/s
Round to 38 m/s
The answer is D.
Answer: I choose A
Explanation:
HELP!!!
Which of these would be supported by the graph?
Answer:
C
Explanation:
It is the answer
Answer:
C. KBr is about twice as soluble as NaCl at 60°C
Explanation:
From the graph of solubility of various solutes with respect to temperature we can figure-out that on y-axis we have the increasing solubility of the solvents in gram per 100 gram of water as we move upwards and on x-axis we have increasing temperature of the solvent (water) moving rightwards.
As we move vertically up through 60°C line we notice that NaCl has solubility nearly 40 grams per 100 gram of water whereas on further moving up in the same line we find that KBr has nearly 80 gram per 100 gram of solubility.
The solubility of NaCl varies negligibly with change in the temperature of water whereas the solubility of KNO3 is greatly increased by the increasing temperature.
Solid solutes have a tendency to dissolve highly in the water with increase in temperature because of increased inter molecular space of the solvent molecules on heating and loosening of the bonds of solid solute.But in case of a gaseous solute the tendency to dissolve into water decreases with increase in temperature because here if the kinetic energy of the molecules increases for the solute then its molecules will escape from the solvent.Lithium atoms give electrons to bromine atoms to form
Lithium atoms give electrons to bromine atoms to form ionic bond.
What is ionic bond?Lithium (Li) is the 3rd element in the periodic table. It can chemically combine with the Bromine (Br) element to form a chemical compound called Lithium bromide.
The Lithium Bromide compound is formed by lithium and bromine is an ionic compound. The bond formed between lithium and bromine is due to the transfer of electrons.
Thus, the Lithium atoms give electrons to bromine atoms to form ionic bond.
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Billy did an investigation to learn whether bean plants will grow if they are given salt water. Billy repeated his experiment three different times. Each time, he used the same kind of been seeds, and he made the salt water by adding exactly 20 grams of salt to 1 liter of water. What is Billy doing by using the same beans and making the salt water exactly the same way each time?
A. using consistency and precision
B. making hypotheses and inferences
C. using safety and observation
D. making predictions and conclusions
B should be your answer good luck!
Answer:
B
Explanation:
THE Answer should be b
Imagine you are digging a hole to the center of the earth. In which order would dig through them?
A. inner core, outer core, upper mantle, lower mantle, crust
B. crust, upper mantle, lower mantle, outer core, inner core
C. crust, outer core, inner core, upper mantle, lower mantle
D. inner core, outer core, lower mantle, upper mantle, crust
Answer:
Crust, Upper Mantle, Lower Mantle, Outer Core, Inner Core
Explanation:
HELP PLEASE!!! 30+ points!!
a book is 9.26 cm tall and placed 22.7 cm to the left of a plane mirror. What is the height of the image formed by the mirror?
4.63
18.5
2.45
9.26
a book is 9.26 cm tall and placed 22.7 cm to the left of a plane mirror. What is the magnitude of the image distance?
22.7
9.26
24.5
11.4
You move away from a plane mirror at a speed of 1.60 m/s. At what speed does your image move away from you?
1.60 m/s
3.20m/s
6.40m/s
0.40m/s
1) 9.26 cm
Explanation:
The focal length of a plane mirror is virtually infinite. Considering the lens equation,
[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]
where f is the focal length, p is the object distance, q the image distance. If we replace f with infinity, we get
[tex]q=-p[/tex]
The magnification equation states that
[tex]y' = -\frac{q}{p}y[/tex]
where y is the size of the object and y' the size of the image. Substituting q=-p, we get
[tex]y'=y[/tex]
this means that the image produced by a plane mirror is always:
- Upright (y' is positive)
- The same size as the object
In this case, we have a book of height 9.26 cm (y=9.26 cm). This means that the magnitude of the size of the image (y') will be 9.26 cm as well.
2) 22.7 cm
As we said before, due to the infinite focal length of a plane mirror,
[tex]q=-p[/tex]
this means that the image produced by a plane mirror is always:
- Virtual (because q is negative)
- At the same distance from the mirror as the object
In this case, we have a book placed at 22.7 cm from the mirror (p=22.7 cm). This means that the magnitude of the distance of the image from the mirror (q) will be 22.7 cm as well.
3) 1.60 m/s
We said previously that the image produced by a plane mirror is always at the same distance from the mirror as the real object. This implies that whenever we move the object toward/away from the mirror, the distance p will alway remain equal to the distance q. But this also means that the object and the distance are moving toward/away from the mirror at the same speed.
Therefore, since in this case the person is moving away from the mirror at 1.60 m/s, the image will also move away at a speed of 1.60 m/s.
Electromagnets are created by
Answer:
I think they are created by running electric currents through a coiled conductive wire.
Explanation:
Hope my answer has helped you!
Is carbon a metal, nonmetal, or semi-metal
Answer: Non metal.
Explanation: Carbon has 4 electrons in it’s valence shell which makes it a metalloid but commonly it is considered as a non metal.
Carbon is considered a nonmetal due to its brittleness, dull appearance, and inability to be reshaped into sheets or wires, despite being a good conductor of heat and electricity.
Explanation:Is Carbon a Metal, Nonmetal, or Semi-Metal?
Carbon is classified as a nonmetal. It is a black and brittle substance that is a good conductor of electricity and heat, which might seem like metallic properties. However, unlike metals, carbon cannot be made into sheets or wires because it is not malleable or ductile. In fact, carbon exhibits several nonmetallic properties such as being dull and brittle. When examining the periodic table, nonmetals are located in the upper right corner except for hydrogen, which is why carbon firmly fits within the nonmetal classification.
In contrast, metals are typically shiny, silvery, and excellent conductors of heat and electricity, plus they can be shaped into sheets (malleable) or wires (ductile). Semi-metals or metalloids exhibit properties that are intermediate between metals and nonmetals. These elements are found along a diagonal band on the periodic table. Therefore, based on its properties and location on the periodic table, carbon is considered a nonmetal.
A stone is projected from the ground with a velocity 14m/s one second later it clears a wall 2 m high. The angle of projection is?
A stone is projected from the ground with a velocity 14 m/sec one second later it clears 2 meter walls then angle of projection is 30 degree.
14sinθ×1−5×12=25
14sin=30
sin=30/14
sinθ>2 not possible
vsinθt−1/2×gt^2=2
14×sinθ−5=2
14xsinθ=7
Sinθ=7/14
Sinθ=1/2
θ=30 degree
What is projectile motion?
Projectile motion is a type of motion in which a object is thrown from the surface earth at some angle it will take projectile projection .
In above question a man thrown a object 14 m/sec an it will moves 2 meter.
Then
vsinθ×t−1/2×gt^2=25
where v = intial velocity in m/sec
t = time in sec
g = acceleration due to gravity
14sinθ×1−5×12=25
14sin=30
sin=30/14
sinθ>2 not possible
vsinθt−1/2×gt^2=2
14×sinθ−5=2
14xsinθ=7
Sinθ=7/14
Sinθ=1/2
θ=30 degree
Therefore, A stone is projected from the ground with a velocity 14 m/sec one second later it clears 2 meter walls then angle of projection is 30 degree.
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Please I need help on this one
Answer:
Your answer would be A, Ball A had more kinetic energy than Ball B.
Explanation:
This is the correct answer because kinetic energy is motion. If balls A and B have an equal mass, but ball A reaches the end of the lane quicker, this is the only answer that is possible.
Study the image. Which phase of the moon as shown? Full moon, first quarter, waning gibbous, waxing crescent
-- If you're observing the moon from a location in the northern hemisphere, like Canada, Russia, the US, or Israel, then it looks like this picture during the waxing crescent phase.
-- If you're observing the moon from a location in the southern hemisphere, like Australia, South Africa, Paraguay, or Antarctica, then it looks like this picture during the waning crescent phase.
Answer:
D. waxing crescent.
Explanation:
So first off its definetly not a full moon because its not full. Not a first quarter because a first quarter is away from the sun on the side of the earth. and not a waning gibbous because only a waxing crescent would be like the one shown on the picture so therefore, its D
If the mass of an object on earth is 100 kg what is it’s weigjt in earth
W = 980N. The weight of an object of 100Kg in the Earth is 980N.
The weight is a measure of the gravitational force acting on an object, the weight is equivalent to the force exerted by a body on a point of support, caused by the action of the local gravitational field on the mass of the body.
it can be defined as the product of mass by the acceleration of gravity, w = mg. Since weight is a force, its unit is the Newton N.
If the mass of an object on earth is 100 kg, then is weight is:
W = (100Kg)(9.8m/s²) = 980N.
Which describes an object in projectile motion? Check all that apply.
Gravity acts to pull the object down.
The object moves in a straight path.
The forward velocity of the object is 0 m/s.
The object’s inertia carries it forward.
The path of the object is curved.
Please and Thank You!
Answer:
Gravity acts to pull the object down.
The object’s inertia carries it forward.
The path of the object is curved.
Explanation:
The motion of a projectile consists of two separate motions:
- A uniform motion along the horizontal direction, where the velocity is constant; since there are no forces along this direction, the velocity does not change, and so the object continues its motion for inertia --> so, the statement "The object’s inertia carries it forward" is true.
- A uniformly accelerated motion along the vertical direction, with a constant downward acceleration (g=9.8 m/s^2, acceleration due to gravity). So, the vertical velocity changes, due to the presence of the gravity that acts to pull the object down.
- As a result of the combination of these two motions, the object follows a curved path (in particular, it is a parabolic path).
Conduction stops when all substances have
Answer:-
It stops when the temperature of all the particles/atoms is equal.
Explanation:
When two objects or substances that have different temperature are placed in contact with each other then there will be flow of heat from hotter object to colder object.
This transfer of heat will continue until the temperature of both the objects become equal.
For example, if a metal box has [tex]T_{1}[/tex] temperature that is higher than another metal box adjacent to it which has [tex]T_{2}[/tex] temperature. Then heat will flow from [tex]T_{1}[/tex] to [tex]T_{2}[/tex] until the temperature of both the boxes become equal to [tex]T_{3}[/tex].
Hence, we can conclude that conduction stops when all substances have same temperature.
The duckbill platypus and spiny anteater are the only two known
marsupials.
a. true
b. false
Answer:
I believe it is False.
Explanation:
Hope my answer has helped you!
Calculate the work done to stretch an elastic string by 40cm if a force of 10N produces an extension of 4cm in it?
Answer:
40 J
Explanation:
Work = change in energy
W = 1/2 k (Δx)²
First we need to find the value of k.
F = kΔx
10 N = k (0.04 m)
k = 250 N/m
Solving for work
W = (250 N/m) (0.40 m)²
W = 40 J
Obi Wan uses his Jedi mind tricks to compel people to do his will. The words he uses begin in his vocal cords which _____ the air molecules in his throat.
Answer:
The correct missing word is: vibrate.
Explanation:
The words he uses begin in his vocal cords which vibrate the air molecules in his throat.
The process by which the air pressure from the lungs is converted into audible vibrations is known as phonation.
When the air passes through the vocal folds, it causes them to vibrate, as phonation occurs. It is due to the vocal folds that a singer has a wide range of control over the pitch of his voice.
What would be Kelly's weight be in Newton's if her mass is 70 kilograms?
It would be the first option, A
because u use the equation: W = m*g
Answer:
A. 70xg (where g refers to gravitational acceleration)
Explanation:
Data:
mass = 70 kg
gravitational acceleration = 9.81 m/(s^2)
Weight is computed as follows:
Weight = mass * gravitational acceleration
Replacing with data:
Weight = 70 kg * 9.81 m/(s^2)
Weight = 686.7 N
A substance has a specific heat of point 870JGC it requires 2000.0 J to increase the temperature of the 10 g of the substance from its original temperature to it's final temperature by how many degrees did the substance increase
Answer:
[tex]229.9^{\circ} C[/tex]
Explanation:
The increase in temperature of a substance is given by
[tex]\Delta T = \frac{Q}{m C_s}[/tex]
where
Q is the amount of heat absorbed by the substance
m is the mass of the substance
Cs is the specific heat capacity
In this problem,
Q = 2000.0 J
m = 10 g
Cs = 0.870 J/gC
Substituting, we find the increase in temperature:
[tex]\Delta T = \frac{2000.0 J}{(10 g)(0.870 g/JC)}=229.9^{\circ} C[/tex]
7. A force of 100 N acting on a body gives it a speed of 200 m/s in 2
sec. what is the mass of the body?
a. 1kg
b. 5 kg
c. 10kg
d. 15kg
Answer:
Choice a. 1 kg, assuming that all other forces on the object (if any) are balanced.
Explanation:
By Newton's Second Law,
[tex]\displaystyle a = \frac{\Sigma F}{m}[/tex],
where
[tex]a[/tex] is the acceleration of the object in [tex]\text{m}\cdot\text{s}^{-2}[/tex],[tex]\Sigma F[/tex] is the net force on the object in Newtons, and[tex]m[/tex] is the mass of the object in kilograms.As a result,
[tex]\displaystyle m = \frac{\Sigma F}{a}[/tex].
Assume that all other forces on this object are balanced. The net force on the object will be [tex]100\;\text{N}[/tex]. The net force is constant. Acceleration should also be constant and the same as the average acceleration in the two seconds.
What is the average acceleration of this object?[tex]\displaystyle \begin{aligned}\text{Acceleration} &= \text{Average Acceleration}=\frac{\text{Change in Velocity}}{\text{Time Taken}}\end{aligned}[/tex].
[tex]\displaystyle {a} = \frac{200\;\text{m}\cdot\text{s}^{-1}}{2\;\text{s}}=100\;\text{m}\cdot\text{s}^{-2}[/tex].
Apply Newton's Second Law to find the mass of the object.[tex]\displaystyle m = \frac{\Sigma F}{a} = \frac{100\;\text{N}}{100\;\text{m}\cdot\text{s}^{-2}} = 1\;\text{kg}[/tex].
Answer:
a.1kg
Explanation:
An object is in circular motion how will the object behave if the centipetal force is removed
Answer:
Explanation:
When a body is in circular motion, the centripetal force acts towards the center of the curvature of the path. It is required to keep the object in circular motion. The velocity acts in the tangential direction to the curvature and when the centripetal force is removed it threads that path
Final answer:
When the centripetal force is removed from an object in circular motion, the object will move in a straight line tangent to the circular path it was previously following.
Explanation:
When the centripetal force is removed from an object in circular motion, the object will continue to move in a straight line tangential to the circular path it was originally following.
This is because an object in circular motion requires a centripetal force, directed towards the center of the circle, to keep it moving in a curved path. The centripetal force acts as the inward force that constantly changes the object's direction to keep it in the circular path.
If the centripetal force is suddenly removed, there is no longer a force acting towards the center of the circle, and the object will continue with its original velocity, moving in a straight line tangent to the circle.
The image shows positions of the earth and the moon in which region would an astronaut feel the lightest
Answer:
The moon region
Explanation:
This is because there is little to no gravity on the moon. That is where the astronaut would feel the lightest.
Answer:
The moon region should be right i got it right on the test
Explanation:
2. Explain the mechanism by which AC (alternating current) through the primary circuit of a transformer produces an alternating voltage and current in the secondary coil. Then explain why this would or would not work with DC (nonalternating current) in the primary coil.
Explanation:
A transformer consists of core of soft iron (a material that can be easily magnetized/demagnetized), to which two coils are attached at both ends.
An alternating current in the primary coil produces a magnetic field around the coil, magnetizing the iron core; therefore, the same magnetic field produces a magnetic flux in the secondary coil.
Since the AC current in the primary coil is variable, then the magnetic field also changes, so the magnetic flux through the secondary coil changes over time; therefore, an electromotive force (and so, a current) is induced in the secondary coil, according to Faraday-Newmann-Lenz:
[tex]\epsilon= - \frac{d\Phi}{dt}[/tex]
where
[tex]\epsilon[/tex] is the induced emf
[tex]\frac{d\Phi}{dt}[/tex] is the rate of change of magnetic flux through the secondary coil
We notice that this mechanism would not work if the current in the primary coil is a DC current: in fact, a DC current has always a constant value, so there is no change in the magnetic field, therefore no change in the magnetic flux through the secondary coil and no emf induced.