Answer:
A
Explanation:
Density is mass/ volume
if the numerator is greater ( A) then the density is greater than B
Why we need to remove seeds from cotton balls?
Answer:
Hope this helps!
Explanation:
The seeds are removed for two reasons:
- You cannot spin cotton into a yarn if there are seeds still in the cotton.
- The seeds are a very valuable component of cotton and have a variety of uses.
Describe the mechanisms by which out-of-plane deformation in the laser forming
process can occur. As part of your answer, identify the mechanism of laser forming
which is active for the experimental results provided.
The mechanisms by which out-of-plane deformation in the laser forming process can occur include:
Temperature gradient mechanismBuckling mechanismUpsetting mechanism.What is Temperature gradient mechanism?This is the mechanism which involves bending the sheet to a laser light source.
The experiment shown in this scenario depicts it as one plane of the sheet can be seen raised.
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Calculate the force on a unit positive charge at p on x axis whose co-ordinates are (x=2m,y=0) due to the following two charges 1. A positive charge of 10−9C situated in air at the origin (X=0,y=0). 2. A negative charge of -2*10−9C situated on X axis(x=1m, y=0
The force on a unit positive charge at the given position is determined as 1.8 x 10⁻⁸ N.
Force on the chargeThe force on the charge is calculated as follows;
F = k(q1q2)/r²
where;
r is the distance between the charges = 2 m - 1m = 1mF = (9 x 10⁹ x 10⁻⁹ x 2 x 10⁻⁹)/(1)²
F = 1.8 x 10⁻⁸ N
Thus, the force on a unit positive charge at the given position is determined as 1.8 x 10⁻⁸ N.
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why does light reflecting off of a piece of paper get scattered in all directions even though it appears to be flat and smooth? (be sure to include the idea of the normal line in your explanation)
Answer:
If light meets a rough surface, each ray obeys the law of reflection. However, the different parts of the rough surface point in different directions, so the light is not all reflected in one direction. Instead, the light is reflected in all directions. This is called diffuse scattering
Explanation:
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By lessening the effects of friction there would be?
Einstein published three major scientific papers. One of these put forward a new way of calculating the size of molecules. Another explained Brownian motion — the random dance performed by specks of dust trapped in a fluid. Einstein suggested that the tiny particles making up the fluid — its atoms or molecules — were bouncing against the specks of dust and causing the motion. These papers helped to establish the reality of atoms and molecules. Another of Einstein’s 1905 papers explained the photoelectric effect — the way that metals could emit electrons (tiny charged particles) from their surface when light was shone on them. Most scientists believed that light travelled in waves — like sound or water waves. But Einstein suggested that the photoelectric effect could be explained if light could also behave as a stream of tiny packets of energy.
(2) Einstein’s paper on the photoelectric effect helped give birth to quantum theory, and it was for this paper that Einstein received the Nobel Prize in 1922. Quantum theory led, in the 1920s and 1930s, to another revolution in physics. Physicists showed that, as well as light waves behaving like particles, particles could sometimes act as waves. This theory established “objective probability” in physics. This was the idea that completely unpredictable chance events can take place at the subatomic level. Einstein never fully accepted the prevalent interpretation of quantum theory. But, while many of these interpretations involve wild metaphysical flights of fancy, the physical results are, like those of relativity, very well established.
(3) Marrying together the two pillars of 20th century physics — relativity and quantum theory — is a central problem for physics even today. Successfully doing this may require a revolution in science similar to those begun by Newton and Einstein. There are three main interconnected driving forces for such changes in science. The first is the development of technology. Changes in technology can make new experiments possible and they also influence the problems that scientists develop an interest in. Newton was fascinated by the new machines of the 17th century. Similarly, Einstein was fascinated by electricity and magnetism. This influence also works in a negative way. The governments and multinationals that control technology are often able to dictate what is researched.
(4) The second factor driving scientific progress is the way that the dominant ideas in society change. Ideas from the broader culture can impinge upon science. Newton’s ideas were part of a revolutionary new attempt at a rational explanation of both nature and society. On the other hand, the dominant ideas in society can also limit the development of science. This is most obvious in the social sciences, where delving too deeply into how society is organized might raise difficult questions for our rulers. Less is at stake in the natural sciences. Indeed, improvements in natural sciences are vital to our rulers if they want to compete effectively with each other. But the distorted worldview of capitalism still impacts on science. Extremely narrow and specialized bodies of knowledge develop—creating problems for scientists trying to bring about the kind of sweeping revolution heralded by Einstein.
(5) Finally, science moves forward because scientists seek to develop logically consistent theories. This can push them beyond the dominant or common sense ideas of their time. Einstein’s breakthrough cannot be reduced simply to changes in technology or wider cultural and ideological shifts. Science is not simply the gathering and ordering of data about the outside world. It also requires abstraction—developing theories about the underlying laws of nature that are usually not immediately apparent. This crucial role of theory is not just a feature of the natural sciences.
(6) Einstein argued that “common sense is the prejudices acquired by age 18”. Marxist theory, which is a social science topic, challenges “common sense” political ideas. If we, according to this theory, want to change the world, we need to combine our actions with theory that digs below the surface appearance of society to understand how the system works.What is the writer’s point of view?
For the author, science is a field that does not just require the collection and ordering of data about the outside world.
According to the text, science must also be the development of theories about the invisible and non-apparent laws of nature.
What factors drive scientific progress?For the author, progress is related to the development of technology, the cultural ideas of society, which change over time, and the logical theories that are developed by scientists.
Therefore, the author proposes a reflection on the challenges of the development of science in today's society, according to the two pillars of physics, which are relativity and quantum theory.
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What is ima of the
doorknob
Answer:
ima of the doornob is a show. they have a movie secires too
Explanation:
If you apply an effort of 240N to a simple machine with a mechanical advantage of 3, what resistance force will the machine produce?
Answer:
720
Explanation:
240x3=720
calculate the momentum, A bald eagle with a mass of 26.4 kg and velocity of 15.6 m/s
Answer:
411.84 kg m/s
Explanation:
Formula :
Momentum = mass × velocity
=========================================================
Given :
⇒ mass = 26.4 kg
⇒ velocity = 15.6 m/s
=========================================================
Solving :
⇒ Momentum = 26.4 × 15.6
⇒ Momentum = 411.84 kg m/s
an object is dropped from a height of 25 meters.at what velocity will it hit the ground?
a.)7.0 m/s
b.)11 m/s
c.)22m/s
d.) 49 m/s
e.) 70 m/s
Answer:
C. 22 m/s
Explanation:
Ignoring air friction....all of the Potential energy will be converted to Kinetic Energy
mgh = 1/2 m ^v^2
gh = 1/2 v^2
sqrt (2 gh) = v = ~ 22.1 m/s
Explain how the intensity of the UV light varies across the Earth
Answer:
Much more UV radiation is absorbed and less reaches the Earth. UV levels are higher closer to the equator. Closer to the equator the sun's rays have a shorter distance to travel through the atmosphere and therefore less of the harmful UV radiation can be absorbed.
Explanation: Hope it helps you :)))))
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help which is the balanced equation
Answer:
b
Explanation:
During radioactive beta-decay, a neutron (1.6749x10-27 kg) at rest decays into a very slow moving proton (1.6726x10-27 kg) and a fast electron (9.109x10-31 kg). What is the speed of the electron? (Hint: find the total energy of the electron)
The speed of the electron emitted in the radioactive beta-decay is determined as 2.186 x 10⁶ m/s.
Speed of electronThe speed of the electron is determined from the total energy of the electron.
Assuming the emitted electrons are in first energy level, E = 13.6 eV
K.E = ¹/₂mv²
v² = 2K.E/m
v² = (2 x 13.6 x 1.6 x 10⁻¹⁹)/(9.11 x 10⁻³¹)
v² = 4.777 x 10⁻¹²
v = 2.186 x 10⁶ m/s
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A boy spins a top on a table. How can he INCREASE the total energy of this system?
A. Decrease the height of the table
B. Spin the top more slowly
C. Spin the top faster
D. Increase the friction of the table.
He can increase the total energy of the system by spinning the top faster.
What is energy?The term energy refers to the ability to do work. The total energy of the system refers to the gravitational potential energy and the rotational energy of the top.
Hence, he can increase the total energy of the system by spinning the top faster.
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3. When are ionic compounds able to conduct electricity?
Ionic compounds conduct electricity when molten (liquid) or in aqueous solution (dissolved in water), because their ions are free to move from place to place. Ionic compounds cannot conduct electricity when solid, as their ions are held in fixed positions and cannot move.
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This country and the chairs they experience after their independence was , in part due to lack of experience in democratic self -government
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Congo/Zaire region is the country which experienced chaos after their independence due to lack of experience in democratic self-government.
What is Democracy?
This type of government involves the people making legislative decisions and choosing those who will rule and represent them.
Congo/Zaire region was not self sufficient and were inexperienced in democratic self-government after independence which led to political crisis.
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You observe your friend standing in line at the cafeteria. You conclude they are buying lunch today. This is an example of: A. A scientific theory. B. An independent variable. C. An inference. D. A hypothesis
Answer:
5875yuguggjgefutfhyds
Explanation:
hfgjffiig
The speed of the cart after 3 seconds of Low fan speed is
The speed of the cart after 3 seconds of Low fan speed is (2) cm/s. This is further explained below.
What is speed?Generally, speed is simply defined as the rapidity of movement or efficiency of operation.
In conclusion, After 8 seconds with the fan set at Low, the cart will have traveled 1 cm/s. After three seconds at medium fan speed, the cart travels at a velocity of two centimeters per second.
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how many components can be realized of a vector?
Answer:
two different components
Explanation:
Any two-dimensional vector can be conceived of as having two distinct components. The component of a single vector describes the vector's effect in a specific direction.
A jogger has an average stride length of 140 cm and takes an average of 200 steps per minute. The jogger's average speed would be
From the calculations, the speed of the jogger is calculated as 4.7 m/s.
What is speed?The term speed refers to the ratio of distance covered to time taken. In this case we know that;
steps per minute = 200 steps per minute.
1 stride length = 140 cm
Distance covered in 200 strides = 200 * 140 = 28000 cm or 280 m
time taken = 1 minute or 60 seconds
Speed of the jogger = 280 m/60 seconds = 4.7 m/s
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Mechanical energy is the sum of
energy and potential energy.
Answer:
True, the total amount of mechanical energy is merely the sum of the potential energy and the kinetic energy. This sum is simply referred to as the total mechanical energy.
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Which statement best describes the relationship between atoms and nuclear forces? (2 points)
Group of answer choices
Strong nuclear forces hold the nucleus of an atom together. Weak nuclear forces hold neutrons and electrons together.
Weak nuclear forces hold the nucleus of an atom together. Strong nuclear forces are responsible for breaking down atoms.
Weak nuclear forces hold small atoms together. Strong nuclear forces hold large atoms together.
Strong nuclear forces hold the nucleus of an atom together. Weak nuclear forces are involved when certain types of atoms break down.
Answer:
D. Strong nuclear forces hold the nucleus of an atom together. Weak nuclear forces are involved when certain types of atoms break down.
Explanation:
A force of 77 N is used to move a desk 1.5 m. How much work was done?
A. 75.2 J
B. 121.0 J
C. 115.5 J
D. 51.3 J
Answer:
As we know,
work = 77 N × 1.5m
therefore 115.5 J work was done
Indicate the North Pole and the direction of the current in each of the wires below.
Answer:
Explanation Draw a diagram showing the direction of the magnetic field lines due to a straight wire carrying current. Also show the direction of current in the wire.When electric current flows through a conductor, an induced EMF is created which in turn creates a magnetic field around it. The magnetic field lines form concentric circles around the conductor. The direction of the magnetic field is perpendicular to the wire and is in the direction of wrapped fingers of the right hand holding the conductor and the thumb pointing upwards indicates the direction of the current.
A magnetic field implies the existence of poles and the polarity of a current carrying conductor is north-south when the current flows in the anti-clockwise direction. When magnetic compass with the north end is brought closer to the 1st end of the conductor, the needle deflects towards the west, that is away from the conductor because the magnetic compass that is pointing in the direction of the earth's magnetic field, i.e. north- south direction repels with the north pole of current carrying conductor. Like poles repel each other. This is the fundamental principle of magnetism.
The North Pole of a magnet is the end that points towards the Earth's magnetic North Pole.
In terms of current flow, the direction of the current in a wire is determined by the flow of positive charge. To indicate the North Pole and the direction of the current in each of the wires below, we can use the right-hand rule. Here's how it works:
1. Hold the wire in your right hand with your thumb pointing in the direction of the current flow (from positive to negative).
2. Curl your fingers around the wire. The direction in which your fingers curl represents the direction of the magnetic field created by the current. 3. The direction in which your thumb points represents the North Pole of the magnet. Let's apply this rule to the wires below: Wire 1: - If the current flows from left to right in wire 1, then your thumb points to the right, indicating the North Pole of the magnet.
Wire 2: - If the current flows from top to bottom in wire 2, then your thumb points downwards, indicating the North Pole of the magnet. Wire 3: - If the current flows from right to left in wire 3, then your thumb points to the left, indicating the North Pole of the magnet. Remember, the direction of the current flow can be reversed, which would also reverse the direction of the magnetic field and the indication of the North Pole. By using the right-hand rule, you can determine the direction of the current and identify the North Pole of a magnet in a wire.
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describe fluid friction and static friction in your own words
Answer:
friction
Explanation: The resistance that one surface or object encounters when moving over another.
Which of the following would cause the greatest increase in gravitational
force between two objects?
OA. Reducing the mass of one object by half
OB. Doubling the mass of one object
OC. Doubling the distance between the objects
D. Halving the distance between the two objects
Explanation:
To be honest, it depends how far away the object is. half of 2 is 1, half of 1000000 is 500000 soo, but I would say doubling the mass.
Does dispersive power of the material of a prism depends upon the shape, size and angle of prism? Explain.
The dispersive power of the material of the prism is independent of the shape, angle of prism or size of the prism. It depends only on the refractive index [tex]{(\mu)}[/tex] of the material of the prism.
Answer:
We can see that the angular dispersion of a prism is dependent on the angle of the prism but dispersive power does not depend on the geometry of the prism.
3. Specify the wrong sentences.
a) young stars at this stage are called red giant. True/False
b) The stars go to the end of their lives by turning most of their hydrogen into helium. True/False
c) Helium sink inside the star, causing its temperature to rise and swelling on the outside, thus extending it. These stars "swollen (puffy)" are known as Supernova. True/False
Answer:
a: false
b: True
c: i dont know
Explanation:
A 5OKG mass is taken to the moon and the mass determined there, comment on the likely result of the measurement
Answer:
Mass will be the same
Explanation:
Mass does not change with gravity .... WEIGHT will be different, but not mass.
Ethanol has a specific latent heat of evaporation of 855kJ/kg. Calculate
the energy required to boil 0.60kg of ethanol.
From the calculation , we can see that the specific heat capacity is 513 kJ
What is the specific heat capacity?The specific heat capacity is the heat that can be able to raise the temperature of 1 Kg of a material by 1K.
Now;
We know that;
Latent heat of evaporation = 855kJ/kg
Mass of the liquid = 0.60kg
H = mL
H = 0.60kg * 855kJ/kg
H = 513 kJ
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