The Renaissance astronomer who wrote the pioneering book that suggested the Earth probably orbits the Sun was Copernicus.
Who is an astronaut?An astronaut observes and performs the experiments based on the universe.
The astronomer observes the universe and its components closely using telescope being on the Earth. While the astronaut goes into space to look in closely.
The astronomer who gave the observation that Earth is orbiting around the Sun was Nicolaus Copernicus.
Thus, the correct option is Copernicus.
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Suppose we observe a cepheid variable in a distant galaxy. The cepheid brightens and dims with a regular period of about 10 days. What can we learn from this observation?.
Answer:
something is passing infront of it
Explanation:
something is orbiting it and blocking its light
A positive test charge of 3. 0 μc experiences a force of 0. 75 n in an electric field. What is the magnitude of the electric field at this location?
The magnitude of the electric field at the location, where a positive test charge of 3. 0 μc experiences a force of 0. 75 n in an electric field is 0.25×10⁶ N/C.
What is electric field?The electric field is the field, which is surrounded by the electric charged. The electric field is the electric force per unit charge.
It can be given as,
[tex]E=Fq[/tex]
Here, F is the electric force and q is the charge.
A positive test charge of 3. 0 μc experiences a force of 0. 75 n in an electric field. Put the values in the fomula,
[tex]E=\dfrac{F}{q}\\E=\dfrac{0.75}{3\times10^{-6}}\\[/tex]
[tex]E=0.25\times10^{6}\rm\; N/C[/tex]
Thus, the magnitude of the electric field at the location, where a positive test charge of 3. 0 μc experiences a force of 0. 75 n in an electric field is 0.25×10⁶ N/C.
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Part C
Set the opaque bowl on a table. Place a penny in the center of the bowl. Back away slowly from the table, and stop immediately when you can’t see the penny. Mark the spot on the floor where you are standing with a piece of tape. Look at the drawing below. It shows how light reflects off the bowl and the penny. (Note that the opaque container is transparent in the drawing so that we can see the path of light.) In which position, A or B, do you see the penny? In which position, A or B, do you not see the penny?
The reason why you can't see the penny in the opaque bowl is because the light is absorbed and does not pass through the bowl.
What is a transparent object?A transparent object is one that can allow light to pass through it while an opaque object does not allow light to pass through it.
The reason why you can't see the penny in the opaque bowl is because the light is absorbed and does not pass through the bowl.
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The reason why you can't see the penny in the opaque bowl is because the light is absorbed and does not pass through the bowl.
Write the chemical symbols for three different atoms or atomic anions with 9 electrons
The chemical symbols for three different atoms or atomic anions with 9 electrons are Neon (Ne), Florine (F⁻¹) and Oxide (O⁻²).
What is atom?An atom is the smallest unit of matter, consisting of the positively charged nucleus and the electrons which move around it. The atom can not be divided further.
The atom of a matter is made by three elements-
1) Neutron-Neutron is the element of an atom, which has zero charge.2) Proton-Proton is the element of an atom, which has a positive charge.3) Electron-Electron is the element of an atom, which has a negative charge.The chemical symbols for three different atoms or atomic anions with 9 electrons has to be write down. Anion is the element which has more number of electron compare to its protons.
This makes the element negatively charged. Neon (Ne), Florine (F⁻¹) and Oxide (O⁻²) are the element which have atomic anions with 9 electrons.
Thus, the chemical symbols for three different atoms or atomic anions with 9 electrons are Neon (Ne), Florine (F⁻¹) and Oxide (O⁻²).
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Carla draws two circuit diagrams that connect the same components in different ways, as shown. which statement about the circuits is correct? the total resistance in circuit a is greater than that in circuit b. when a bulb in circuit a goes out, the other bulbs keep shining. the bulbs in circuit a shine brighter than those in circuit b. when a bulb in circuit b goes out, the other bulbs go out.
Carla draws two circuit diagrams that connect the same components in different ways, as shown. The correct statement is "the total resistance in circuit a is greater than that in-circuit b.". Option A. This is further explained below.
What is a circuit?Generally, a circuit is simply defined as a fixed schedule of activities, but In terms of physical structure of a connection circuit is a visual description of a body of electrical connection and it help the practitioner ro better understand its subject and easily make connections.
In conclusion, Carla creates two circuit schematics, as illustrated, that link the same components in various ways. "The overall resistance in circuit an is larger than that in b," is the correct statement.
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Answer:
A
Explanation:
Edge 2022
A parallel beam of light of wavelength 450nm is incident normally on a diffraction grating which has 300lines/mm what is the total number of intensity maxima observed?
The total number of intensity maxima observed is determined as 15.
Number of intensity maxima observedThe number of intensity maxima observed is calculated as follows;
[tex]n = \frac{1}{\lambda N}[/tex]
n = (1) / (450 x 10⁻⁹ x 300 x 10³)
n = 7.4
The total number of intensity maxima observed;
nt = 2n + 1
nt = 2(7) + 1
nt = 15
Thus, the total number of intensity maxima observed is determined as 15.
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Which is a characteristic of atoms?
1 They come in ten major types.
2 They are the smallest units of matter.
3 They can be found in nonliving things only.
4 They cannot combine together.
Answer: 2
Explanation: bro this is literally basic knowledge
A resistor with r = 340 ω and an inductor are connected in series across an ac source that has voltage amplitude 490 v. The rate at which electrical energy is dissipated in the resistor is 316 w
The value of impedance Z of the circuit, when the rate at which electrical energy is dissipated in the resistor is 316 w, is 508 ohms.
What is impedance Z of the circuit?The impedance Z of the circuit is the ratio of voltage amplitude to the maximum current.
[tex]Z=\dfrac{V}{I}[/tex]
Here, V is voltage amplitude and I maximum current.
A resistor with R = 300 Ω and an inductor are connected in series across an ac source that has voltage amplitude 490V. The rate at which electrical energy is dissipated in the resistor is 316 W.
The rate at which electrical energy is dissipated in the resistor is the product of the resistance and the square of current. Thus,
[tex]316=340\times I^2\\I=\sqrt{\dfrac{316}{340}}\\I=0.964\rm\; A[/tex]
The impedance Z of the circuit is,
[tex]Z=\dfrac{V}{I}\\Z=\dfrac{490}{0.964}\\Z=508\rm\; ohm[/tex]
Thus, the value of impedance Z of the circuit, when the rate at which electrical energy is dissipated in the resistor is 316 w, is 508 ohms.
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how long does it take to do 278J of work with 17 W of power
Answer:
t= 278/17 =16.35s
Explanation:
p=w/t
t=w/p
∴t=278/17
Answer:
t=16.4
Explanation:
power = energy/time
p=e/t
17=278/t
t=278/17
t=16.352941
t=16.35
t=16.4
Because sound waves vibrate longitudinally, what can result?
A. Disruptions of fixed waves
B. Changes in the density of air
C. Pressure differences where compressions are rarefied
D. Regions of high pressure and low pressure
Answer:
D
Explanation:
toke the test Regions of high pressure and low pressure
Which substance in the air of U.S. cities has decreased least since the Clean Air Act began?
A. carbon monoxide
B. ground-level ozone
C. particulate matter
D. sulfur dioxide
Answer: the answer is carbon monoxide
Explanation:
hope this helps :)
Explain how the water in the puddle forms part of the water cycle?
Answer:
The water makes a cloud when the warm moist air meets the colder air. This demonstrates the formation of what we know as "clouds". Then precipitation happens when the clouds gets to full of water droplets. Finally, accumulation happens when the water forms puddles and goes back to the lakes and streams.
What is the total kinetic energy of a 5-kg hoop with a radius of 0. 5 m when it rolls without slipping at 4. 0 m/s?
The total kinetic energy of a 5-kg hoop with a radius of 0. 5 m when it rolls without slipping at 4. 0 m/s is 80 Joules.
What is kinetic energy?The kinetic energy is the ability to do work by virtue of its motion.
The mass of the hoop is 5 kg, the radius of the hoop is 0.5 m and the speed with which it is rolling is 4.0 m/s.
The angular speed of the hoop is
ω = v / r
ω = 4 / 0.5 = 8 rad/s
The moment of inertia of the hoop is I = m r² / 2
The kinetic energy of the rolling object is the addition of translation and rotational kinetic energy.
K.E = 1 / 2(mv²) + = 1 / 2(Iω²)
Substituting the values into the above equation and solving, we get the total kinetic energy.
K.E = 40 + 40 = 80 Joules
Thus, the total kinetic energy is a rolling hoop is 80 Joules.
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The volume of empty space between gas particles is.
Answer:
either atoms or molecules
What positive impact can animals have on the environment?
(A They eat fruit
(B They eat insects
(C They pollinate flowers
(D They spread disease
Answer:
maybe C they pollinate flowers
Explanation:
because when you search you will see pollination
Temperature measures the average kinetic energy per molecule. true or false
Answer:
true
Explanation:
An 80-g arrow is fired from a bow whose string exerts an average force of 95 N on the arrow aver a distance of 80 cm.
What was the work done on the arrow?
The chemical reaction in Plants happens when... *
O Roots absorb water
O Roots absorb soil nutrients
O Sunlight is turned to food
O Carbon Dioxide is turned to Oxygen
Answer:
carbon dioxide is turned to oxygen
Explanation:
because carbon and oxygen are bonded together to form a molecule therefore in order to separate them a chemical reaction would be required
Electric current can be produced in a wire by simply moving a ________________ into or out of a wire coil.
magnet
stick
battery
uranium
Electric current can be produced in a wire by simply moving a magnet into or out of a wire coil. Option A is correct.
What is the Faraday law of electromagnetic induction?According to Faraday's law of electromagnetic induction, the rate of change of magnetic flux link with the coil is responsible for generating emf in the coil to result in the flow of amount of current .
The phenomenon of inducing voltage by changing the magnetic field around a conductor will be Electromagnetic Induction.
So in order to increase the current, we need to increase the EMF;
so we can increase it by;
1) Increasing the number of turns
2) Increase the area of the loop
3) By moving the magnet faster
Hence, option A is correct.
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Scientists in the laboratory create a uniform electric field e⃗ = 6. 0×105 k^v/m in a region of space where b⃗ =0⃗
Scientist in the laboratory create uniform electric field.
PART A: The electric field in rocket frame is (0,0, 6.0 × 10 ⁵).
PART B: The magnetic field in the rocket frame is 7.3 × 10⁻⁶ j∧ .
What is uniform electric field?The electric field whose strength is not changing with respect to time is called uniform magnetic field.
The electric field is 6.0 × 10 ⁵ k^v/m and the magnetic field is zero.
E' = E + (V×B)
= 6.0 × 10 ⁵ + (1.1 × 10⁶ × 0)
E' = 6.0 × 10 ⁵ k∧
(Ex , Ey, Ez) = (0,0, 6.0 × 10 ⁵)
The new magnetic field is represented as
B' = B - 1 /c²(v × E)
=0 - 1 / (3× 10⁸)²(1.1 × 10⁶ i∧ × 6.0 × 10 ⁵k∧ )
B' = 7.3 × 10⁻⁶ j∧
PART A: The electric field in rocket frame is (0,0, 6.0 × 10 ⁵).
PART B: The magnetic field in the rocket frame is 7.3 × 10⁻⁶ j∧ .
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A stationary charge is located between the poles of a horseshoe magnet. Is a magnetic force excerted of the charge? why?
A stationary charge is located between the poles of a horseshoe magnet. The magnetic force exerted by the charge is zero.
What is charge?Charge is the physical property of matter which cause a particle to attract or repel when placed in its field.
A stationary charged particle does not interact with a static magnetic field. A charge placed in a magnetic field experiences a magnetic force. There will be no magnetic force acting on a stationary charge. The charge must be moving in order to have magnetic force on it.
Thus, the magnetic force exerted by the charge is zero.
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The half-life of I-137 is 8.07 days. If 25 grams are left after 40.35 days, how many grams were in the original sample?
Answer:
40.35 da / 8.7 da/half-life = 5 half lives
The sample has gone thru 5 half lives
2^5 = 32 only 1/32 of the original amount is left
25 g * 32 = 800 g present in the original sample
2) Which of the following images correctly depicts the direction of the
Earth's velocity if Sun was suddenly eliminated?
NEED TODAY
Two projectiles are thrown in the air with the same initial speed. one was launched at 20° while the other was launched at 70°. Both projectiles landed at the same point. Did they stay in the air for the same amount of time ?
Answer:
No, projectile launched at 20° landed first.
Explanation:
70° projectile had a vertical velocity of v*sin(70), which is significantly bigger than v*sin(20). Since v=vx+at, we can see that [tex]Vyi*sin(20)-gt < Vyi*sin(70)-gt[/tex]
solve for t, you can check that by substituting velocity for any number.
Answer:
well,they may or they may not. It all depends on the vertical components of the speed with which the projectile is thrown.
Explanation:
to derive the time of flight :
Considering the vertical motion (along y axis) , the journey from the ground to highest point
v=u+at ,where v=final velocity , u=initial velocity , acceleration due to gravity i.e g and t is the time taken by the particle to reach the highest point
o=u(sin theta) + (- g)t
t=u(sin theta) - g
Hence total time of flight is twice of that i.e
T=2(vertical components of speed) / g
So, if two projectile have some vertical components of velocity , they will have equal time of flight.
Use the energy equation from this week’s notes, your answer from
An energy equation is a chemical equation which involves the energy that is evolved or absorbed in the reaction.
What is energy?The term energy refers to the ability to do work. An energy equation is a chemical equation which involves the energy that is evolved or absorbed in the reaction.
This question is incomplete as the former energy equation is not shown. However, such equations can be used to know an endothermic or exothermic reaction.
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Find the mass of a child who runs at a speed of 4 m/s to get a pizza with extra cheese. His momentum is 120 kg•m/s.
The ISS can, at times, be seen from Earth.
True or false
Answer:
True but mostly false.
Explanation:
If you squint enough at night, you'd be able to see it. Otherwise it's not really possible.
Write any three advantages of classification of living beings ?
Answer:
Answer: The advantages of classifying organisms are as follows: (i) Classification facilitates the identification of organisms. (ii) helps to establish the relationship among various groups of organisms. (iii) helps to study the phylogeny and evolutionary history of organisms.
Explanation:
hope it will help you
HELPPP PLEASE NOBODY EVER HELPS ME
1. Events involving a disk-shaped nebula occurred before the nuclear fusion that led to the birth of the solar system. Which two statements about the disk-shaped nebula are true?
Gravity caused the disk-shaped nebula to shrink.
Gravity caused the nebula to flatten out in its disk-like shape.
Rotational motion caused the disk-shaped nebula to shrink.
Rotational motion caused the nebula to flatten out in its disk-like shape.
The flattening of the disk caused the speed of rotation to decrease.
2. Match each orbiting body to its attribute.
varies greatly in size from one to the next
has a characteristic glow
usually burns up if it enters Earth's atmosphere
primarily made of hydrogen and helium
Comet
Meteoroid
Gas giant
Asteroid
3. What are two reasons why the terrestrial planets formed closer to the Sun after the supernova event that initiated the formation of the solar system?
They are made of denser objects, which can condense at relatively high temperatures.
They contain lightweight materials that condense in areas of relatively low radiation.
They are made of heavier elements, which have a stronger gravitational attraction to the Sun.
They are relatively small in size, so the Sun’s gravity has a strong influence on them.
They have gaseous surfaces, which is ideal in those areas of high radiation near the Sun.
Answer:
1. Gravity caused the disk-shaped nebula to shrink.
Rotational motion caused the nebula to flatten out in its disk-like shape
2. Comet - has a characteristic glow
Meteoroid - usually burns up if it enters Earth's atmosphere
Gas giant - primarily made of hydrogen and helium
Asteroid - varies greatly in size from one to the next
3. They are made of denser objects, which can condense at relatively high temperatures
They are made of heavier elements, which have a stronger gravitational attraction to the Sun
Explanation:
These should be the correct answers. Hope this helped!
Recall that Hubble's law is written v = H0d, where v is the recession velocity of a galaxy located a distance d away from us, and H0 is Hubble's constant. Suppose H0 = 20 km/s/Mly. How fast would a galaxy 1000 Mly distant be receding from us?
Hubbles' law is applicated on galaxies. The galaxy which is 1000 Mly distant from us has the speed 20000 km/s.
What is Hubble's law?Hubble's law is defined as the galaxies are moving away from Earth at speeds proportional to their distance.
Hubble's law is written as
v = H₀d
Here v is the recession velocity of a galaxy located a distance d away from us, and H₀ is Hubble's constant.
Suppose H₀ = 20 km/s/Mly.
1 parsec = 3.08 ₓ 10¹⁶ m
1 M parsec = 3.08 ₓ 10²² m
The speed v of the galaxy is
v = 20 ₓ 1000
v = 20000 km/s
Thus, the galaxy which is 1000 Mly distant from us has the speed 20000 km/s.
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