At high speeds, gas vibrates and moves freely. The liquid vibrates, moves about, and slides past one another. Solids vibrate (jiggle) but do not move from one location to another.
Select all the correct answers. a silver coin rubs vigorously against a wool cloth. the cloth becomes positively charged. which statements are true? the silver coin lost electrons. the silver coin gained electrons. the wool cloth lost electrons. the wool cloth gained protons. the wool cloth lost protons.
The true statements are, the silver coin lost electrons and the wool cloth lost protons.
What is a positive charge?A positive charge is an ion with excess proton. In this process the atom deficient number of electron as compared to protons.
When a silver coin is rubbed vigorously against a wool cloth, the silver coin which is a metal will loss electron, having excess number of protons and becomes positively charged in the process.
Thus, the true statements are;
the silver coin lost electrons and the wool cloth lost protons.
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What is the speed of an electromagnetic wave traveling through the air?
use c = 299,792,458 m/s in your calculation.
The speed of an electromagnetic wave traveling through the air will be 2.9 ×10⁸ m/sec.
What is a refractive index?The refractive index of a substance also known as the refraction index or index of refraction is a dimensionless quantity that specifies how quickly light passes through it in optics.
The refractive index is found as;
[tex]\rm n= \frac{c}{v} \\\\ 1.000293=\frac{3 \times 10^8}{v} \\\\ v=2.9 \times 10^8 \ m/sec[/tex]
Hence, the speed of an electromagnetic wave traveling through the air will be 2.9 ×10⁸ m/sec.
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Which statements describe some of the original ideas proposed about the universe during the big bang? check all that apply. the universe exploded. the universe was opaque. the universe was one second old. the universe was very hot and dense. the universe expanded from a single point.
The statements which describe some of the original ideas proposed about the universe during the big bang include:
The universe was opaque.The universe was very hot and dense.The universe expanded from a single point.What is Big bang theory?This is the theory about the formation of the universe which states that a single point began to expand which resulted in its formation.
This was as a result of observations and ideas which can be seen mentioned above.
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Answer:
B. The universe was opaque.
D. The universe was very hot and dense.
E. The universe expanded from a single point.
Explanation:
Water’s property of surface tension is due to _____.
A. capillary action
B. solubility
C. cohesion
D. adhesion
E. All of the above
Explanation:
It is due to cohesion (option C)
Find the force of a 240 kg vehicle accelerating at a rate of 4.5 m/s/s when it hits the wall.
Answer:
1080 Newtons
Explanation:
F = m * a
F = 240kg * 4.5 m/s
F = 1080
Which best explains horatio’s error? magnetism is not produced by electric currents unless the wire is coiled. the magnetic field does not continually spread outward from the wire. the magnetic field is produced inside the wire, not outside of it. magnetism is only produced when a metal bar is placed near the wire.
What best explains Horatio’s error is the magnetic field does not continually spread outward from the wire. Option B. This is further explained below.
What is a Magnetic field?Generally, a Magnetic field is simply defined as an area of magnetism that exists around a magnetic substance or a moving electric charge.
In conclusion, The magnetic field does not continuously expand outward from the wire, which best explains Horatio's miscalculation.
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Answer:
B
Explanation:
How many basic states of matter exist?
three
two
five
four
Answer:
There are four basic states of matter
Prove that force canbe defined as rate of change in momentum
The force can be defined as rate of change in momentum because consists of the action of rotating or twisting a body around its axis of rotation (pole) through the application of a force.
What is the difference between moment and force?The magnitude of the moment (M) is defined as the product of the magnitude of the force (F) and the distance (d) between the line of action of the force and the axis. The unit of moment of a force in the international system of units is N.m.
Torque, or moment of a force, is the tendency of a force to rotate a body on which it is applied. Torque is a vector perpendicular to the plane formed by the force and radius of rotation vectors.
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In reality, the kinetic energy at the bottom of the ramp will always be less than the gravitational potential energy at the top of the ramp. Does this disprove the law of conservation of energy? Where did the "lost" energy go?
Answer:
Conservation of energy still holds - so somewhere in traversing some of the potential energy was converted into something other than kinetic energy.
The loss of energy can be attributed to several things - friction on the ramp, air resistance, friction within the item descending the ramp; in general one would say that some of the initial PE was lost during the descent of the ramp. and did not show up as KE.
The earth takes 375.25 days to orbit around the sun. Is the earth accelerating?
Answer:
Yes
Explanation:
Centripetal acceleration = a = v^2/r
Trent builds a model electric motor. when he connects a battery to the motor, the motor spins through a half rotation and stops. which is the most likely solution to the problem? replacing the battery, because it is not providing current installing new brushes, because they are not making a good connection checking the commutator, because the current is not reversing adding more wire coils in the armature, because the electromagnet is too weak
The most likely solution to the motor spinning a half rotation and stopping is checking the commutator, because the current is not reversing.
What are electric motors?Electric motors are devices that convert electrical energy into mechanical energy used in driving other devices.
Electric motors require batteries to work or A.C. currents to work.
The most likely solution to the motor spinning a half rotation and stopping is checking the commutator, because the current is not reversing.
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Answer:
c
Explanation:
edge 2022
Research indicates that high serotonin levels may increase aggression. please select the best answer from the choices provided t f
The statement 'research indicates that high serotonin levels may increase aggression' is FALSE.
What is serotonin?Serotonin is a chemical messenger (i.e., a hormone) used to transmit messages through the body.
Serotonin is generated by the nerve cells (neurons) of the central nervous system (CNS).In conclusion, the statement 'research indicates that high serotonin levels may increase aggression' is FALSE.
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which statement best describes the position of the image of an object viewed in a plane mirror?
A). the image is a different distance from the mirror but on the same side of the mirror as the original object
B). the image is the same distance from the mirror and on the same side of the mirror as the original object
C). The image is a different distance from the mirror and on the other side of the mirror as the original object.
D). the image is the same distance from the mirror but on the other side of the mirror as the original object.
The statement D best describes the position of the image of an object viewed in a plane mirror, The image is the same distance from the mirror but on the other side of the mirror as the original object.
What is the image?When light beams from an object reflect off a mirror, they intersect with the picture of that thing, called an image. Real and virtual images are the two sorts of images.
The following parameters can be used to describe an image:
1. It is possible for an image to be real or virtual.
2. Left-right reversal is possible or not.
3. The image can be inverted or upright.
4. The image can be enlarged, shrunk, or made the same size as the object.
Plane mirrors provide virtual images that are upright, inverted left-right, the same distance from the mirror as the item, and the same size as the thing.
As a result, the best description of image production by a plane mirror is “a virtual picture is produced behind the mirror.”
The statement D best describes the position of the image of an object viewed in a plane mirror, The image is the same distance from the mirror but on the other side of the mirror as the original object.
Hence, option D is correct.
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What will be an ideal location for the exhaust fan on your Kitchen wall,
10m or 12m above the floor? Justify your answer.
The ideal location for the exhaust fan on your Kitchen wall should be 12m above the floor.
What is exhaust fan?Exhaust fan is defined as the device that is used to remove excess moisture, odors, and stale air usually from the kitchen.
When being installed in the kitchen, it should be above the kitchen stove and high enough to be able to remove the steam from the cooking activities.
Therefore, the ideal location for the exhaust fan on your Kitchen wall should be 12m above the floor.
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The powertrain of many machines consists of _____
gears - answer
linkages
trusses
splines
Answer:
gears - answer
Explanation:
Hope it helps
A body which is uniformly decelerated comes to rest in 5s after travelling of 10m. What is its initial velocity a distance
Answer:
4 m/s
Explanation:
v=u+ at and v^2=u^2+2as.
It is given that v=0,t=5 s and s=10 m.
⇒0=u+5a and 0=u^2+20a.
⇒a=−u/5 and a=−u^2/20.
⇒u/5 = u^2/20⇒u=4 m/s.
⇒ The initial velocity is 4 m/s.
A 20 kg rock sits on the edge of a cliff that is 100 m high.
a. What potential energy does the rock-Earth system possess relative to the base of the cliff?
b. The rock falls without rolling from the cliff. What is its kinetic energy just before it strikes the ground?
c. What is the rock’s speed as it hits the ground?
The potential energy of the rock is 19600 J. Then, the kinetic energy when it hits the ground will be 19600 J. The velocity before it hits the ground will be 44.2 m/s.
What is potential energy ?The potential energy of an object is the energy by virtue of its position. It is related to the mass, m ,height h and acceleration due to gravity g as follows:
p = mgh.
Given m =20 kg
height = 100 m
g = 9.8 m/s²
then p = 20 kg × 100 m × 9.8 m/s² = 19600 J.
When the rock falls down as it approaches the ground, the potential energy converts to kinetic energy. Hence, the kinetic energy before it strike the ground will be 19600 J.
Ke = 1/2 mv² = 19600 J
then v = √ (2 Ke/m)
v = √(2× 19600 J/20 kg) = 44.2 m/s.
Therefore, the speed of the rock as it hits the ground is 44.2 m/s.
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Complete the paragraph to describe the characteristics of the Sun and Rigel, a blue-white supergiant.
Rigel and the Sun have similar characteristics, but they also differ in some ways. Rigel and the Sun are spheres of gas that use nuclear fusion to produce energy. Rigel is
the Sun. Rigel has
the Sun. Rigel has a surface temperature of about
.
The Rigel is more warmer and brighter as compared to the sun due to its high temperature.
Describe the characteristics of the Sun and Rigel?The Rigel is more warmer and brighter as compared to the sun due to its high temperature and its brightness is about 47,000 times more than that of the Sun. Because of its high temperature, the Rigel is white as compared to the sun.
So we can conclude that the Rigel is more warmer and brighter as compared to the sun due to its high temperature.
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A child pulls on a wagon with a force of if the wagon moves a total of in what is the average power delivered by the child?
Given the force exerted by the child to pull the Wagon through the given distance and time, the average power delivered by the child is 16.9 Watts.
This question is incomplete, the complete question is:
A child pulls on a wagon with a force of 75N. If the wagon moves a total of 42m in 3.1min, what is the average power delivered by the child?
What is Power?Power is simply the amount of energy transferred or converted per unit time.
It is expressed as;
P = W/t
Where W is work done and t is time elapsed.
But Work done is expressed as;
W = F × d
Where F is force applied and d is distance covered.
Hence;
Power = W/t = Fd / t
Given that;
Force exerted F = 75N = 75kgm/s²Distance covered d = 42mTime elapsed t = 3.1min = ( 3.1 × 60)s = 186sAverage power delivered P = ?Power = Fd / t
Power = ( 75kgm/s² × 42m ) / 186s
Power = (3150kgm²/s²) / 186s
Power = 16.9 kgm²/s³
Power = 16.9 Watts
Given the force exerted by the child to pull the Wagon through the given distance and time, the average power delivered by the child is 16.9 Watts.
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a body moves on to 120 km long track if he moves first 30 km with a speed of 30 km per hour then what is the speed for next 90 so that average speed becomes 60 km per hour
Answer:
90 km/hr
Explanation:
AVERAGE is 60 km/hr so 120 km / 60 km/hr = 2 hours total
first 30 km / 30 km / hr = 1 hour used 1 hour left
now there is 90 km to cover in the second hour
so that must be 90 km/hr
How long does it take to travel?
120 miles at 40mph
Answer:
it takes 3 hours to travel
Explanation:
120 ÷ 40 = 3
Step 1. distance = speed * time or time = distance/speed.
Step 2. time = 120 miles/(40 miles/hour) = 3 hours.
Step 3. ANSWER: It would take 3 hours to travel 120 miles at 40 mph.
State that there are positive and negative charges.
Yes there are
Explanation:
Both kind of charges exist. (e≈1.60 x 10^-19 C)
Charge is the intrinsic property of a body, that allows it to have either of two kinds of itself.
Positive elementary charge is
[tex]{x}^{1 +} [/tex]
And negative is
[tex] {x}^{1 -} [/tex]
There are two types of electric charges in nature, they are positive and negative charges.
What is meant by charge ?
Charge is defined as the intrinsic property of matter, by which it experiences a force, when placed in an electromagnetic field.
Here,
In nature, there are two type of electric charges. They are positive charge and negative charge.
The two charges exists in the nature, because, the positive charge attracts the negative charge.
The earth is actually neutral in nature. If a positive charged body is connected to the earth, the positive charge will be drained to the ground. This can be clearly described that, when the surface of earth becomes positively charged, there occurs a potential difference between the surface and the ground.
As a result, the electrons flows from the ground to the surface. The negative charge and positive charges cancels each other and thus neutralizing the surface.
The same happens when a negative charged body is connected to the surface of earth, the charge will be neutralized by the positive charge.
Hence,
There are two types of electric charges in nature, they are positive and negative charges.
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What are created when atoms join
together?
A. new elements
B. unstable conditions
C. molecules
Answer:
molecules
Explanation:
Molecules will be formed if atoms join together.
Choose the best answer among the given alternative answers. 1. Two opposite forces acting perpendicular to an axis cause a. Back and forth motion c. Sliding motion b. Rotation d. No motion (at rest)
2. The part of an electric motor that reverses current in a segment of the coil is. a. Armature c. Brushes b. Commutator d. Battery that makes the
Answer:
C
Explanation:
What is an enzyme and what is it from
Answer:
Enzymes help break down food that we consume. They are found in the stomach or small intestine.
Which statements must be true about the two congruent, shaded figures? select two options. the figures are rectangles because they are formed inside a rectangle. the figures are rhombi because they are formed by four congruent line segments. the figures are trapezoids because each has exactly one pair of parallel sides. the figures are parallelograms because their opposite sides are parallel. the figures are quadrilaterals because each has four sides.
The true statements about the two congruent, shaded figures are:
D. The figures are parallelograms because their opposite sides are parallelE. The figures are quadrilaterals because each had four sidesWhat is Congruence?This refers to the name that is given if two figures or objects have the same shape and size.
Hence, we can see from the complete text that four parallel lines are drawn in a rectangular sign and painted using two colors in an alternating pattern, then they are parallelograms because their opposites are parallel.
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A circular loop of wire is placed in a uniform magnetic field directed out of the page. Suddenly the magnetic field disappear . What is the direction of the induced current in the loop?
Hi there!
Counterclockwise.
If a loop of wire is placed in a magnetic field directed out of the page that disappears, that means that the magnetic flux out of the page through the loop has decreased.
The loop will try to oppose this change in the magnetic flux, so an induced current that produces an additional magnetic field out of the page will occur to make up for the decrease in the magnetic flux.
Using the magnetic right-hand rule, the current in the loop would need to be traveling in the counterclockwise direction in order for the produced magnetic field to be directed out of the page inside the loop.
Describe the sound produced by an instrument of length L, that is open at both ends. Be sure to include the terms pitch, frequency, timbre, nodes and antinodes
The sound produced by an instrument of length L that is open at one end posses has a high frequency.
What is Sound?Sound is kind of vibration which travels in the form of sinusoidal wave through a medium which can be solid, liquid or gas/air.
Sound produced by an instrument which has an open end has a high
frequency and pitch, nodes , timbre and a low antinode. These are all the characteristics of a sound produced by the instrument.
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The new memory-driven computer being developed by NASA and Hewlett Packard Enterprises is lightweight, hundreds of times faster than today’s most advanced computers, and is designed to hold one of the most advanced artificial intelligences.
True or False
The statement is true.
What is NASA do?
NASA stands for National Aeronautics and Space Administration. NASA is a U.S. government agency that is responsible for science and technology related to air and space. The Space Age started in 1957 with the launch of the Soviet satellite Sputnik. NASA opened for business on Oct.
What does NASA use AI for?NASA is constantly progressing in AI applications for space research, such as automated image analysis for the galaxy, planet, and star classification, developing autonomous space probes that can avoid space junk without human involvement, by using AI-based radio technology to make communication networks more.
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Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer:
Option 2
Explanation:
When something is acidifying on the pH scale, it generally means the pH is decreasing. Hence, the correct option for the question is :
The ocean pH is decreasingOcean acidification means the acidity of the ocean water is increasing
We know according to pH scale
pH<7 is acidicSo
the pH of oxygen is tending to 1 which is most acidic .
Ocean pH is decreasing (B)