Thomas Alva Edison was a North American scientist and inventor who is credited with the design of the electric bulb and many other patented inventions.
However, the bulb did not come out on the first attempt, and was sometimes questioned by his repeated "failures". But his patience and perseverance paid off, after approximately 10,000 attempts, he managed to obtain an incandescent bulb that would last for a long time.
It should be noted that Edison was once asked if he considered that he had had many failures before making the bulb work, hence his famous phrase:
“I have not failed 10,000 times—I’ve successfully found 10,000 ways that will not work.”
That is why Edison is considered an example of perseverance.
Answer:
10,000
Explanation:
Which statement is true? A. Kepler's laws apply only to the motion of Earth. B. Kepler's laws can be used to predict eclipses. C. Kepler's laws are true for a central force that is directly proportional to distance. D. Kepler's laws can be deduced from Newton's laws of motion and gravity.
Answer:
D. Kepler's law can be deduced from Newton's laws of motion and gravity.
Explanation:
Answer:
D. Kepler's laws can be deduced from Newton's laws of motion and gravity.
Explanation:
What event do you think caused the universe to start expanding?
Answer: Astronomers theorize that the faster expansion rate is due to a mysterious, dark force that is pulling galaxies apart.
Explanation:
Astronomers theorize that the faster expansion rate is due to a mysterious, dark force that is pulling galaxies apart.
The event that the faster expansion rate is due to a dark force that is pulling galaxies apart.
What is universe?Universe is the whole cosmic system of matter and energy. The Earth, the Sun, the Moon, the planets, the stars along with the ,dust , gases, rocks forms the universe.
The big bang is the theory which explains that how the universe began. It says that the universe began with just a single point. It went on expanding and stretched to grow as large as possible. It is still now expanding.
The universe consist of fully dark matter, interstellar gases or dust. The big bang is increasing just because in universe there is abundant of hydrogen and helium.
The radiations come from the big bang. These rays are also called as cosmic wave. This universe is still on it way of expanding more.
Thus, the faster expansion rate is due to a dark force pulling the galaxies apart.
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What instrument is used to measure liquid volume?
Answer:
Graduated Cylinder
Explanation:
looked it up ⊕↔⊕
Liquid volume can be measured using a graduated cylinder or a burette, and the specific density of liquids can be assessed with a hydrometer. Accurate readings are taken at the bottom of the meniscus.
Explanation:The instrument used to measure liquid volume is a graduated cylinder, which comes in various sizes and is commonly used in laboratory settings. It allows for precise measurements of volumes by sub-dividing the space between milliliter marks. Another instrument used in chemistry for measuring liquid volume is the burette, especially when conducting titrations. Furthermore, a hydrometer can be employed to measure the specific density of liquids, which indirectly helps infer volume based on known densities.
To obtain accurate volume measurements with a graduated cylinder, one should read the volume at the bottom of the meniscus, which is the lowest point of the curved surface of the liquid. It's also essential to ensure that the graduated cylinder is level and that the observer's eye is at the level of the meniscus while making the reading.
It's time for Santa to deliver his presents. Assuming he delivers presents all over the world, he has to travel about 75,000,000 miles. If he travels East to West, he can use the time zones to make Christmas day last 31 hours. What speed, in miles per hour, must Santa fly to get all of his presents delivered?
The overall function of the calvin cycle is __________.
Answer:
the primary function of the Calvin cycle is to make organic products plants need, using the products from the light reactions of photosynthesis (ATP and NADPH).
Explanation:
hope this helped
Which statement below concerning the photoelectric effect is true? View Available Hint(s) Which statement below concerning the photoelectric effect is true? There is a threshold frequency for each metal, and only light of a frequency higher than this threshold causes electrons to be emitted from the metal surface. Light with a frequency below the threshold frequency can still cause electrons to be emitted from the metal surface, but there will be a lag time while sufficient energy to dislodge the electrons builds up. There is a threshold wavelength for each metal, and only light of a longer wavelength than this threshold causes electrons to be emitted from the metal surface. Increasing the intensity (amplitude) of the light shined on a metal surface is sufficient to cause the emission of electrons from a metal surface.
Sound is a disturbance that travels through a medium as a
Answer:
Sound waves. Anything that vibrates is producing sound; soundis simply a longitudinal wave passing through a medium via the vibration of particles in themedium. Consider a sound wavetraveling in air
In which item is energy stored in the form of gravitational potential energy? A. A slice of bread B. A compressed spring C. An apple on a tree D. A stretched bow string
The things that determine the amount of an object's gravitational potential energy are ...
-- mass of the object
-- gravitational acceleration in the place where the object is
-- height of the object above the ground or the floor
A). a slice of bread; No. It's still a slice of bread even if it's on the ground.
B. A compressed spring; No. It's still a compressed spring even if it's on the ground.
C. An apple on a tree; Yes ! It can't be an apple on a tree if it's on the ground.
D. A stretched bow string; No. It's still a stretched bowstring even if it's on the ground.
Gravitational potential energy is the energy stored in an object due to its height above the ground. An apple on a tree possesses gravitational potential energy because it has the potential to fall due to gravity.
Explanation:The item in which energy is stored in the form of gravitational potential energy is an apple on a tree (option C). Gravitational potential energy is the energy stored in an object due to its position above the ground. The higher the position of the object, the higher its gravitational potential energy. In this case, an apple hanging on a tree has a potential of falling to the ground due to gravity, hence it has gravitational potential energy.
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A circular orbit would have an eccentricity of
Explanation:
The orbit of a body around another in space, is described by six orbital elements that determine its orientation, position, size and shape.
In the specific case of the shape of the orbit, this is determined by its eccentricity, which varies between 0 and 1 in the case of closed orbits (circle and ellipse). When the eccentricity is 0, the shape of the orbit is circular, when this value begins to vary until approaching 1 (without reaching 1), the shape of the orbit becomes more elliptical.
In this sense, a circular orbit will have an eccentriciy of zero.
An orbit's eccentricity measures its deviation from being a perfect circle. A circular orbit, where every point on the edge is an equal distance from the center, has an eccentricity of zero. This is true in celestial physics, where all orbits, including those of planets like Mars, demonstrate this principle.
Explanation:In physics, the measure of how much an orbit deviates from being perfectly circular is referred to as its eccentricity (e). This concept is particularly relevant in the study of celestial bodies and their movement. In an elliptical or bound orbit, the eccentricity can range from 0 to less than 1. However, for a circular orbit, the eccentricity is always 0. This is because in a circle, the distance from the center to the edge is consistent all around, meaning the two foci coincide at the center, and thus, the eccentricity is zero.
An ellipse could be described as a circle of zero eccentricity, where the semimajor axis would equal the radius. We can use planets as an example. All planets have orbits with low eccentricities and for instance, Mars' eccentricity is greater than that of many other planets but still less than 0.1. This central attribute has allowed scientists to conclude that Mars's orbit is more of an ellipse than a circle, adding to the understanding of celestial movement.
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PLEAAAAAASE HELPPPP ON THIS ONE SOMEONE!!
Answer:
A
Explanation:
v = 3*10^8
f = 4*10^18
wavelength = v/f
=3*10^8 / 4*10 ^18
=7.5*10^-11
What would decrease the resistance of wires carrying an electric current?
Answer:
A decrease in length, or the use of a material with lower resistivity, or an increase in the cross-sectional area of the wire
Explanation:
The resistance of a wire is given by
[tex]R=\frac{\rho L}{A}[/tex]
where
[tex]\rho[/tex] is the resistivity of the material of the wire
L is the length of the wire
A is the cross-sectional area
We see that:
R is directly proportional to [tex]\rho[/tex] and L - therefore if we decrease one of these two, the resistance of the wire will decrease too
R is inversely proportional to A - therefore if the increase the cross-sectional area, the resistance of the wire will decrease
Answer:
A. shorter wires.
Explanation:
If the real gi tract is 9 meters long, the model you created is what fraction of the real one
The fraction of the real tract that was created is A. 1/4.
How to calculate the fraction?From the complete question, the model that was created is 2.25m long.
Therefore, since the real gi tract is 9 meters long, the fraction of the model created will be:
= 2.25/9
= 1/4
In conclusion, the fraction is 1/4.
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The fraction representing the model GI tract at 5 meters long to the real one at 9 meters is 5/9.
Explanation:If the real gastrointestinal (GI) tract is 9 meters long and the model created is 5 meters in length, then to find the fraction that represents the model's length relative to the real GI tract, you would divide the length of the model by the length of the real GI tract. The calculation would be 5 meters (model) divided by 9 meters (real GI tract).
The fraction that represents the model's length to the real one is 5/9.
In his gold foil experiment, Rutherford shot alpha particles at very thin gold foil. What were the results of this experiment? Most of the alpha particles bounced back from the gold foil to the observers. All of the alpha particles passed right through the gold foil. Most of the alpha particles passed through the gold foil without deflection, except for a small percentage. The alpha particles became attracted to the electrons and got stuck in the gold foil.
Answer:
Most of the alpha particles passed through the gold foil without deflection, except for a small percentage.
Explanation:
Answer:
Most of the alpha particles passed through the gold foil without deflection, except for a small percentage.
Explanation:
The Rutherford experiment throw some interesting results where the most particles passed the gold foil like they where in vacuum, but others particles dispersed with large angle even thought some of them bounce back.
Rutherfor explain tis behavior assuming that the positive charge in an atom its concentrate in a region called nucleus, where this nucleus its very small compared with the size of the atom.
The alpha particles used in the experiment where identified as a helium nucleus particles.
Which radioisotope is used in dating geological formations?
Explanation:
Let's begin by explaining that for radioactive geological dating (also called radioisotope dating) in which radioactive impurities were selectively incorporated when the fossil materials were formed, it is very useful to compare it with a naturally occurring radioisotope having a known half-life.
Now, taking into account that the fossils are millions and millions of years old, radioisotopes are needed that exceed this measure.
To understand it better:
The longer the half-life of a radioisotope, the greater its utility for estimating fossil ages or geological formations.
In this sense, uranium-238 (U238) has a half-life of 4,470 million years, therefore, it is among the most commonly used radioisotopes for fossil and geological dating.
Consider a golf club hitting a golf ball. To a good approximation, we can model this as a collision between the rapidly moving head of the golf club and the stationary golf ball, ignoring the shaft of the club and the golfer. A golf ball has a mass of 46 g. Suppose a 200 g club head is moving at a speed of 40 m/s just before striking the golf ball. After the collision, the golf ball's speed is 60 m/sa) what is the momentum of the club and ball system right before the collision?b) immediately after the collision, the momentum of the club and ball system will be? (less than, the same as, or greater than before the collision)c)a manufacturer makes a golf ball that compresses more than a traditional golf ball when struck by a club. how will this affect the average force during the collison?d) by approximately how much does the club head slow down as a result of hitting the ball?Please show all work!
Answer:
1. 8.0kg * m/s
2. The same as before the collision
3. The force will decrease
4. 14 m/s
The momentum before the collision and after the collision will be the same hat is 8 Kgm/s, and the club head slows down by 13.8 m/s after hitting the ball.
According to the law of conservation of momentum, the total momentum of a system before and after the collision must be the same.
Total Momentum = vector sum of (mass × velocity) of all the bodies
Mass of club head = 200g = 0.2kg
initial velocity of club head = 40 m/s
final velocity of the club head = v
mass of the ball = 46g = 0.046 kg
initial velocity of the ball = 0 m/s
final velocity of the ball = 60 m/s
Momentum before collision = 0.2 x 40 = 8 kgm/s
Now, by conservation of momnetum:
Momentum before collision = Momentum after the collision = 8 kgm/s
Momentum after the collision = momentum of the ball + momentum of the club head after the collision
8 = 0.046 x 60 + momentum of the club head after the collision
momentum of the club head after the collision = (8 - 2.76) kgm/s
momentum of the club head after the collision = 5.24 kgm/s
0.2 x v = 5.24
v = 5.24/0.2
v = 26.2 m/s is the final velocity of the club head.
the club head slows down by 40 - v = 40 - 26.2 = 13.8 m/s after hitting the ball.
if a manufacturer makes a golf ball that compresses more than a traditional golf ball when struck by a club the average force on the ball will decrease. Since force is defined as the rate of change of momentum. If the ball can be compressed more, it will take more time to transfer momentum to the ball, which will reduce the rate of change of momentum of the ball. Hence, the average force will decrease.
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when one end of iron poker is put into the edge of a fire the other end of the poker gets hot due to what the heat transfers?
A) Convection
B) Conduction
C) Insulation
D) Radiation
Answer:
The answer is B) Conduction
: Conduction is the AWNSER
Explanation: just trust me
How do you know how many valence electrons an atom has?
Which subatomic particle has a negative charge
Answer:
The electron
Explanation:
The atom consists of three subatomic particles:
- The proton: protons are inside the nucleus of the atoms, they have positive charge of +e ([tex]+1.6\cdot 10^{-19} C[/tex]), and a mass of approximately [tex]1.67\cdot 10^{-27} kg[/tex]
- The neutron: neutrons are also located inside the nucleus of the atoms, they have no electrical charge and mass similar to the mass of the proton
- The electron: electrons orbit around the nucleus in a cloud, they have negative charge of -e ([tex]-1.6\cdot 10^{-19} C[/tex]), and their mass is about 1800 time smaller than the mass of the proton ([tex]9.11\cdot 10^{-31} kg[/tex])
Answer: The structure of an Atom Quick Check
1. Which subatomic particle has a negative charge? Electron
2. The number of protons in one atom of an element is that element's... Atomic Number
3. Which statement about subatomic particles is NOT true? Protons and neutrons have the same charge.
4. How many neutrons are in the isotope carbon-14? 8
Explanation:
Aristotle's ideas about falling bodies were accepted for more than a thousand
years. Why did a new idea replace Aristotle's ideas?
O
A. The new idea was supported by experimental evidence.
B. The new idea was supported by the leaders of the time.
O
O
C. The new idea was more modern.
O
D. The new idea was more popular.
Answer: A. The new idea was supported by experimental evidence
A P E X
Explanation:
What is the current in the 30 Ω Resistor?
There is 3 resistors all in a series.
The total resistance is 10 + 20 + 30 = 60 Ω
The current is the voltage divided by the resistance:
Current = 120 V / 60 Ω = 2 Amps.
A block of steel has a density of 0.29lbs per cubic inch. If the block has dimensions of 1 inch by 1 inch by 3 inches, what is its weight?
A. 0.29lbs
B. 0.58lbs
C. 0.87lbs
D. 1lbs
Answer: i believe the correct answer is c. 0.87lbs
The ozone hole appears in antarctica during
Answer:
The ozone appears in Antarctica during the Arctic spring.
Explanation:
From September to early December, strong winds start to circulate around the Arctic and creates an atmospheric container.
A stone is dropped from a tower 100 meters above the ground. The stone falls past ground level and into a well. It hits the water at the bottom of the well 5.00 seconds after being dropped from the tower. Calculate the depth of the well. Given: g = -9.81 meters/second2
Take the stone's position at ground level to be the origin, and the downward direction to be negative. Then its position in the air [tex]y[/tex] at time [tex]t[/tex] is given by
[tex]y=100\,\mathrm m-\dfrac g2t^2[/tex]
Let [tex]d[/tex] be the depth of the well. The stone hits the bottom of the well after 5.00 s, so that
[tex]-d=100\,\mathrm m-\dfrac g2(5.00\,\mathrm s)^2\implies d=\boxed{22.6\,\mathrm m}[/tex]
A stone is dropped from rest from the top of a cliff into a pond below. If its initial height is 10 m, what is its speed when it hits the water?
Answer:
14 m/s
Explanation:
The motion of the stone is a free fall motion, so an accelerated motion with constant acceleration g = 9.8 m/s^2 towards the ground. So, we can use the following SUVAT equation:
[tex]v^2 -u^2 = 2gh[/tex]
where
v is the final speed of the stone as it reaches the water
u = 0 is the initial speed
g = 9.8 m/s^2 is the acceleration
h = 10 m is the distance covered by the stone
Solving for v, we find
[tex]v=\sqrt{u^2+2gh}=\sqrt{0+2(9.8 m/s^2)(10 m)}=14 m/s[/tex]
President franklin roosevelt’s domestic program
Compare and contrast scientific theory and scientific law
Answer:
Similarities:
Both are based on observation.Both are supported by empirical dataBoth are tested repeatedlyBoth are accepted by scienceBoth are based on natural phenomenaDifferences:
Scientific law just describes a phenomenon. It does not give an explanation as to why the phenomenon occurs. It predicts an outcome of an event based on its initial condition.Scientific theory gives an explanation as to why an event had occurred.Laws are more resistant to change.Theories can be refuted and accepted, and develop other theories as wellTake note:
A scientific theory cannot be "upgraded" into a law, and a scientific law cannot be changed into a theory.
Scientific laws describe generalized patterns in nature, often with mathematical equations like Newton's second law of motion (F = ma), while scientific theories, such as the Theory of Evolution, offer complex explanations for a group of related phenomena. Laws illustrate what happens and theories explain why it happens. Scientific theories do not turn into scientific laws with new evidence.
Comparing Scientific Theory and Scientific Law
Scientific laws and scientific theories are foundational to understanding the natural world but serve different purposes within scientific inquiry. Scientific laws are concise descriptions of a generalized pattern in nature, often expressed through a mathematical equation. For instance, the law of conservation of energy that states energy is conserved in any process is a prime example of a scientific law. Another example is Newton's second law of motion (F = ma), describing the relation between force, mass, and acceleration.
On the other hand, a scientific theory provides an explanation for a broad range of phenomena, such as the Theory of Evolution or the Theory of Relativity. Theories are more complex, interpreting a group of related phenomena and are the result of a scientific method. While laws describe what happens, theories explain why it happens.
Laws vs. Theories: It's a misconception that theories transform into laws with more evidence. Instead, laws describe patterns we observe in data and are usually written as equations. Theories, which remain theories irrespective of new evidence, offer explanations for the patterns described by laws.
The world is divided into how many time zones
Answer:
24 time zones
Explanation:
Which of the following means that a lens can focus light?
A.-di
B.+di
C.-f
D.+f
Answer:
D. +f
Explanation:
A lens works by refraction: it bends light rays as they pass through it so they change direction. A lens that can focus light is called a convex lens or converging lens, Light rays passes through the lens, refracts and are focused on a single point.
There's a simple measurement that tells you how powerful a lens is and it's known as the focal length. The focal length of a lens is the distance from the center of the lens to the point at which it focuses light rays. The shorter the focal length, the more powerful the lens.
+f means that the light rays coming from one side of a lens are focused on the other side of the lens at point F. In this case light can be focused.
-f means that the light rays coming from one side of a lens after being refracted through the lens appear to be diverging from a single point F' on the same side of the lens.
Answer: +f
Explanation:
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Two children playing on a frictionless garden gate invent a new game called "gate". The idea is that they will get on opposite sides of the gate and each push such that the gate does not move. If they both push horizontally and perpendicular to the gate and one child pushes with a force of 170 N at a distance of 0.590 m from the hinges, determine the force the second child must exert in order to keep the gate from moving if she pushes at a distance of 0.430 m from the hinges.
Answer:
233 NExplanation:
The balance condition, to keep the gate from moving, requires that the net torque be zero, this is, the torques on both sides of the gate must be equal.
Torque equation: τ = F × da) Torque applied by one of the children:
F = 170 N d = 0.590 m τ₁ = 170 N × 0.590 mb) Torque applied by the second child:
F = ?d = 0.430 m τ₂ = F × 0.590 mc) Equilibrium condition:
τ₁ = τ₂170 N × 0.590m = F × 0.430mF = 170 N × 0.590 m / 0.430 m = 233 N ← answerIn this Physics question involving torque, the second child needs to exert a force of about 233 N to ensure the gate remains stationary.
Explanation:This is a problem involving the concept of torque in Physics. Torque, denoted by 'τ', is a measure of how much force acting on an object causes it to rotate. The torque produced by a force can be calculated using the formula τ = rFsinθ, where 'r' is the force applied, 'F' is the force, and the distance between the pivot point and the force application
'F' is the force applied, and 'θ' is the angle between the force vector and the line connecting the point of application and the pivot.
In this context, though, since the forces are applied perpendicularly, you can use a simplified version: τ = rF. For the gate to remain stationary, the torques exerted by the children must be equal, i.e., τ₁ = τ₂.
This means that (0.59 m * 170 N) = (0.43 m * F₂).
Solving the equation for F₂ (the force the second child has to exert) gives you F₂ = (0.59 m * 170 N) / 0.43 m, which computes to approximately 233 N.
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