Answer:B the light refracts.
Explanation: a good example is an straw in a cup. When the light goes through the glass the straw looks broken an bigger
What was the Law of Triads? A. Elements were arranged into three rows. B. Elements were arranged in groups of three. C. Elements were arranged into three periods. D. Elements were arranged into three periods and three groups.
Answer:
its B
Explanation: i searched it up...
The Law of Triads, proposed by Johann Dobereiner, grouped elements into triads based on similar properties, with an example being the triad of lithium, sodium, and potassium. The correct answer is B: Elements were arranged in groups of three.
The Law of Triads was an early attempt to categorize elements based on their properties by grouping them in sets of three with similar characteristics. Answer to the student's question is B: Elements were arranged in groups of three. This concept was proposed by the German chemist Johann Dobereiner in 1829. Dobereiner noticed patterns among certain groups of three elements (triads) such as lithium, sodium, and potassium as well as chlorine, bromine, and iodine. He found that the atomic masses of the lightest and heaviest elements in a triad, when averaged, were close to the atomic mass of the middle element, and these triads also had similar chemical reactions. However, this system had limitations as it could not categorize all known elements. Today, we recognize that portions of the periodic table, particularly the d-block, have triads of elements with substantial similarities. The periodic table has since evolved to arrange elements in increasing order of atomic numbers, forming periods and groups that reflect periodic functions of their atomic numbers.
The image shows a working flashlight.
Which force produces the type of energy shown by the X in the diagram?
O gravitational
O electromagnetic
O strong
O weak
The force which produces the type of energy shown by the X in the diagram is electromagnetic. The second option is correct.
What is electromagnetic wave?The electromagnetic wave is the white light or Sunlight coming directly from the Sun. This light ray is the form of wave. This light when falls on any object segregates into the range of all types of EM radiation.
Radiation is packet of energy that travels and spreads out. It has radio waves, infrared waves and visible light waves, ultraviolet rays and microwaves.
The image shows a working flashlight.
The force which produces the type of energy shown by the X in the diagram is electromagnetic
Thus, the second option is correct.
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Directions Part 2: Using what you learned about the formation of the Grand Canyon and which layer is oldest, try to answer the following mystery using the same principles.
Help
Background: Ms. Smith was expecting to get her new iPad in the mail when she got home from work. She had been telling everyone how excited she was to get the newest version. Shockingly, someone broke into her mailbox and stole it. She talked to all the people who had been at her house that day and each said they had not seen anything and that the mailbox was in good condition when they left. She determined that the last person to leave her house was likely the culprit. The diagram below shows the “footprints” left in front of the mailbox. Who was it?
Clues:
The Neighbor walks to work
The Handyman rides a bike
The Cook rides a motorcycle
The Maid drives a car
The Nephew has a dog
Answer: Neighbour
Explanation: Taken perspective from the given clues:
The Neighbor walks to work
The Handyman rides a bike
The Cook rides a motorcycle
The Maid drives a car
The Nephew has a dog
If we assume that the handyman delivered the iPad in the mailbox, then
The direction of the cook, Nephew and his dog are perpendicular to the direction of the bike of the handyman. So, it can't be the cook, Nephew and the maid.
The two suspects are the handyman and the neighbour.
If the handyman actually dropped the iPad and left, then, the neighbour should be the culprit.
During a baseball game l. A hitter strikes the ball with a bat. When this happens, the ball and the bat exert a firce on each othe. Why does the ball accelerate away from the vat more than accelerates away from the ball?
During a baseball game, the ball accelerates more than the bat when hit because the bat has more mass, resulting in a smaller acceleration. A more massive bat can make the ball fly off faster due to greater energy transfer, explained by the center of mass concept. The physics behind this phenomenon involves Newton's third law and the relationship between force and acceleration.
Understanding the Physics of a Bat Hitting a Ball
When a batter hits a baseball, both the bat and ball exert forces on each other due to Newton's third law, which states every action has an equal and opposite reaction. However, the ball accelerates away from the bat more than the bat accelerates away from the ball because of their different masses. According to the formula acceleration (a) = force (F) / mass (m), since the bat has a larger mass, it will have a smaller acceleration compared to the ball, which has a smaller mass. This relationship is also reflected in the concept that more massive bats and rackets impart more speed on the ball. The center of mass frame explains this by considering that a heavier racket or bat has more inertia, allowing a greater transfer of energy to the ball during impact, especially when the racket or bat is initially at rest.
The follow-through in sports like tennis or baseball increases the time of impact, which increases the velocity change of the ball. Also, the force exerted by a bat on a ball in a collision can be measured by the change in the ball's velocity and the duration of the impact. For example, if a 150-g baseball reverses direction after colliding with a bat, the average force exerted can be calculated using the change in velocity and the collision time.
In conclusion, the reason the ball accelerates more than the bat upon impact, and why a heavier bat makes the ball leave faster, is due to the principles of physics involving mass, force, and acceleration, as well as energy transfer during the collision.
a minibus is travelling along a flat road. predict what would happen if the tyres on the minibus were not properly inflated. use friction to justify your answer.
Answer:
If said tires were not properly inflated more of the tire would be touching the ground due to the "sag" greatly increasing the friction of the road and the tires also maybe slightly less relevant the axle has to "lift" the tire around each rotation of the wheel which together would make it much harder for the bus to move forward.
Explanation:
Mirrors reflect light and lenses absorb light.
True
False
2. A conducting sphere with neutral charge is connected to the ground. A negatively charged rod is
moved near the sphere. While the rod is near the sphere, the ground is disconnected. The rod is
then moved away. What is the charge on the sphere?
(10 Points)
A)Positive
B)Neutral
C)Negative
Newton's "quantity of motion" is conservation.
True
False
1. When a mass of 0.5 kg is attached to a certain spring, the spring stretches a
distance of 0.1 meters,
a. What is the k-constant of this spring?
Answer:
Spring constant, k = 49 N/m
Explanation:
It is given that,
Mass that is attached to the spring is 0.5 kg
Due to this mass, the spring stretches a distance of 0.1 meter.
We need to find the spring constant of this spring. When the spring is attached to the spring, the force on spring is balanced by its weight such that,
[tex]mg=kx[/tex]
k is spring constant
[tex]k=\dfrac{mg}{x}\\\\k=\dfrac{0.5\times 9.8}{0.1}\\\\k=49\ N/m[/tex]
So, the spring constant of the spring is 49 N/m.
What does a protoplanetary disk most likely have in common with Earth's Solar System?
A.
They both decrease in gravity as they accumulate more mass.
B.
They both are in motion and are held together by gravity.
C.
They both have well-defined planets that orbit due to gravity.
D.
They both have planets that have formed without gravity.
Answer:
B
Explanation:
A protoplanetary disk is most likely associated with Earth's solar system because they are both in motion and held together by gravity. So, the correct option is (B).
What is Gravity?
Gravity is also called gravitation. It is a force that exists between all material objects in the universe. When the mass of any two objects or particles is non-zero, the gravitational force that attracts them to each other.
This occurs on objects of all sizes, from subatomic particles to clusters of galaxies.
Newton's law of universal gravitation can be explained by this formula:-
[tex]F=G{\frac{m_1m_2}{r^2}}[/tex]
where, F = force
G = gravitational constant
[tex]m_1[/tex] = mass of object 1
[tex]m_2[/tex] = mass of object 2
r = distance between centers of the masses
Earth's solar system exist in motion which is held by gravity like protoplanetary disk.
Thus, a protoplanetary disk is most likely associated with Earth's solar system because they are both in motion and held together by gravity. So, the correct option is (B).
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What do you think swarming locusts affect planted crops?
Answer:
they say yum yum as they eat planets and make humans starve
Explanation:
but they still eat them
Answer:
Large swarms of locusts can completely strip the foliage and stems of plants such as forbs and grasses. ... They often eat dry plant matter on the ground and will forage for weak or dead grasshoppers when plant food is scarce. As nymphs have a large appetite, they cause more damage than adults.
Explanation:
Paleobotany is the study of fossil insects. True False
Answer:
False
Explanation:
Paleobotany is the study of fossil plants.
Answer:
false
Explanation:
You are asked to design a retroreflector using two mirrors that will reflect a laser beam by 180 degrees independent of the incident direction of the beam. What should be the angle between the two mirrors?
To create a retroreflector with two mirrors that reflects a laser beam by 180 degrees, the mirrors should be arranged at a 90-degree angle to form a corner reflector. The light reflects off each mirror at the same angle it arrived, resulting in the beam retracing its path back.
Explanation:To design a retroreflector with two mirrors that reflects a laser beam by 180 degrees independent of the incident direction, the angle between the two mirrors should be precisely 90 degrees. This configuration creates a corner reflector. When a beam of light strikes one mirror, it reflects off at the same angle it arrived but on the opposite side of the normal (per the Law of Reflection). The beam then strikes the second mirror, which is perpendicular to the first, and it once again reflects off at an angle equal to its incident angle relative to the normal of the second mirror. Because the mirrors are at a 90-degree angle to each other, the two reflections combined result in the light retracing its path back, creating a 180-degree reflection.
Retroreflectors are commonly used for this purpose because they ensure the reflected light beam is always parallel to the incoming light, regardless of where it strikes the reflector. This characteristic is critical in applications like road signs and bicycle reflectors, where visibility from various angles is essential.
What is the frequency of a sound wave when the speed of sound is
345 m/s and it has a wavelength of 1.31 m?
To calculate the frequency of a sound wave with a speed of 345 m/s and a wavelength of 1.31 m, use the formula f = v / λ, which yields a frequency of approximately 263.36 Hz.
To find the frequency of a sound wave, you can use the formula for the speed of sound, where speed (v) is equal to the product of the frequency (f) and the wavelength (λ). This relationship is expressed as v = f × λ. Given the speed of sound is 345 m/s and the wavelength is 1.31 m, you can rearrange the formula to solve for frequency: f = v / λ.
By substituting the given values, the calculation for frequency is: f = 345 m/s / 1.31 m. This gives us a frequency of approximately 263.35877862595 Hz, which we can round to 263.36 Hz.
Examine the properties of the three magnets in the chart below. Which of these
magnets is most likely a temporary magnet?
Answer:
C
Explanation:
(multiple choice) A student is building a model roller coaster. The car rolls down from a standing start at the top of the first hill, which is 2 m high. The car fails to make it up to the top of the second hill, which is 2.1 m high. Ignoring friction and air resistance, which is MOST LIKELY the source of the problem?
A. The car has too much mass.
B. The second hill is higher than the first.
C. The car is going too fast at the bottom of the first hill.
D. The first hill is too high.
Answer:
B. The second hill is higher than the first
Explanation:
The model roller coaster car fails to reach the top of the second hill because it is higher than the first hill, and without additional energy, it can climb only as high as the starting point due to energy conservation.
The student is building a model roller coaster and the car rolls down from a 2 m high first hill and fails to make it up a 2.1 m second hill. Ignoring friction and air resistance, the most likely source of the problem is B. The second hill is higher than the first. According to the principles of conservation of energy, when the car rolls down the first hill, it converts potential energy into kinetic energy. This kinetic energy is then converted back into potential energy as the car climbs the second hill. If no energy is lost to friction or air resistance, the car should reach the same height from which it started. However, since the second hill is 2.1 m high, which is higher than the original 2 m, the car does not have enough energy to reach the top of the second hill.
A student fires a cannonball diagonally at an angle of 71° with an initial speed of 31m/s. Neglect drag and the initial height of the cannonball.
What was the cannonball's initial horizontal speed?
What was the cannonball's initial vertical speed?
How long did the cannonball rise?
What was the cannonball's total flight time?
What was the cannonball's maximum height?
How far from the cannon did the cannonball land (measured along the ground)?
Answer:
vx = 10.09 m/s
vy = 29.31 m/s
t = 5.98 s
ymax = 43.83 m
xmax = 60.37 m
Explanation:
A) The horizontal speed is constant in the complete trajectory. It is given by:
[tex]v_x=v_ocos\theta\\\\v_x=(31m/s)(cos71\°)=10.09\frac{m}{s}[/tex]
B) The vertical initial speed is:
[tex]v_y=v_osin\theta\\\\v_y=(31m/s)(sin71\°)=29.31\frac{m}{s}[/tex]
C) The flight time is given by:
[tex]t=\frac{2v_osin\theta}{g}\\\\t=\frac{2(31m/s)(sin71\°)}{9.8m/s^2}=5.98s[/tex]
D) The maximum height is:
[tex]y_{max}=\frac{v_o^2sin^2\theta}{2g}\\\\y_{max}=\frac{(31m/s)^2(sin71\°)^2}{2(9.8m/s)}=43.83m[/tex]
E) The maximum horizontal distance is:
[tex]x_{max}=\frac{v_o^2sin2\theta}{g}\\\\x_{max}=\frac{(31m/s)^2sin(2*71\°)}{9.8m/s^2}=60.37m[/tex]
Provides detailed calculations for the initial horizontal and vertical speed of a cannonball fired at an angle, its rise time, flight time, maximum height, and horizontal distance traveled.
The initial horizontal speed of the cannonball: 31m/s × cos(71°) = 10.089m/s
The initial vertical speed of the cannonball: 31m/s × sin(71°) = 29.387m/s
The time the cannonball rises: vy = uy + at, so t = (29.387m/s) / g ≈ 3 seconds
The total flight time of the cannonball: Twice the time it takes to rise ≈ 6 seconds
The maximum height of the cannonball: Using the kinematic equation h = uy² / (2g), h ≈ 44.877m
The distance from the cannon to where the cannonball lands: Horizontal distance = vx × total flight time = (10.089m/s) × 6s ≈ 60.534m
A. The boat uses a heat engine to move. This is a simple schematic of how a heat engine operates. Describe what this schematic is showing in terms of the laws of thermodynamics. (6 points)
Answer: The internal heat energy of the boat heat engine, metamorphoses into mechanical workdone that causes the boat to move.
Explanation: First law of thermodynamics tells us that energy cannot be created nor destroyed, it can only be transformed from one form to another.
The internal heat energy of the boat heat engine, metamorphoses into mechanical workdone that causes the boat to move.
According to the second law of thermodynamics which state that when energy changes from one form to another form, or matter moves freely, entropy (disorder) in a closed system increases. Differences in temperature, pressure, and density tend to even out horizontally after a while
what is the maximum speed of a 34-g object bouncing on a spring (k=78.1 N/m) with an amplitude of 3.5-cm?
Answer:
The maximum speed of the mass is 1.67 m/s.
Explanation:
We have,
Mass of object is 34 g or 0.034 kg
Spring constant of the spring is 78.1 N/m
Amplitude attained by the object is 3.5 cm or 0.035 m
It is required to find the maximum speed of the object in this spring mass system. The maximum speed is given by :
[tex]v=A\omega[/tex]
[tex]\omega=\sqrt{\dfrac{k}{m}}[/tex]
[tex]v=A\sqrt{\dfrac{k}{m}}[/tex]
Plugging all the values in above formula,
[tex]v=0.035\times \sqrt{\dfrac{78.1}{0.034}}\\\\v=1.67\ m/s[/tex]
So, the maximum speed of the mass is 1.67 m/s.
Final answer:
The maximum speed of a 34-g object bouncing on a spring with an amplitude of 3.5-cm is 0.335 m/s.
Explanation:
To find the maximum speed of the object, we need to first calculate the maximum potential energy stored in the spring, and then convert it to kinetic energy. The formula for the potential energy stored in a spring is given by:
PE = (1/2)kx²
Where PE is the potential energy, k is the force constant of the spring, and x is the amplitude. In this case, the amplitude is 3.00 cm, or 0.03 m, and the force constant of the spring is 1.25 N/m. Substituting these values, we get:
PE = (1/2)(1.25 N/m)(0.03 m)²PE = 0.0005625 JThe maximum kinetic energy is equal to the maximum potential energy:
KE = 0.0005625 JThe maximum speed of the object can be calculated using the formula:
v = √(2KE/m)
Where v is the maximum speed, KE is the maximum kinetic energy, and m is the mass of the object. In this case, the mass of the object is 0.0100 kg. Substituting these values, we get:
v = √(2(0.0005625 J)/(0.0100 kg))v = √(0.1125 m^2/s²)v = 0.335 m/sTherefore, the maximum speed of the object bouncing on the spring is 0.335 m/s.
A car's acceleration is negative. This means the car is __
traveling in a circle
speeding up
slowing down
changing direction
please help i am cunfuseled! Students examined the smaller structures of living things and non-living things. Which of the following observations provides evidence that the smaller parts of living things, and not the non-living things, are cells? Smaller parts of living things– A are tightly packed together with almost no space between them. B carry out functions that sustain life such as respiration. C are uniform in size and structure. D cannot be seen with the unaided eye but require a microscope.
Answer:
B they carry out functions that sustain life such as respiration
The observations that provides evidence that the smaller parts of living things, and not the non-living things, are cells is D. cannot be seen with the unaided eye but require a microscope.
What are the makeup of living things?Cells are the smallest units of life and they are too small to be seen with the eye. They can only be seen with a microscope. So, the observation that the smaller parts of living things cannot be seen with the unaided eye but require a microscope is evidence that they are cells.
The other options are not correct. Option A, tightly packed together with almost no space between them, is not specific to cells. Many non-living things, such as sand, are also tightly packed together. Option B, carry out functions that sustain life such as respiration, is also not specific to cells. Option C, are uniform in size and structure, is not always true for cells. Cells can vary in size and structure depending on their function.
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What is the mechanical advantage of the frictionless plane shown below?
Inclined plane
A. 0.64
B. 1.31
C. 1.4
D. 1.56
Answer:
D: 1.56
Explanation:
On a frictionless plane, W||=Wsin(θ). To push the brick up the plane, the car has to push with a force just greater than W||. To lift the brick directly, a force just greater than W must be used. The mechanical advantage is the ratio of the force needed to lift the brick directly to the force needed to lift the brick with the plane:
MA=Force needed to lift object without inclined plane/Force needed to lift object with inclined plane
MA=W/W||
MA=W/Wsin(θ)
MA=1/sin(40∘)
MA=1.56
Which two statements about composite materials are true?
Answer:
Here down below is 3 things true about composite materials
Explanation:
-They’re made up of more than one substance.
-They have the same or similar properties as the materials used to make them.
-They’re always made of metal.
-They’re readily available in nature.
Kaya collects the data shown in the table. What is the resistance in the circuit? 0.05 1.8 5.7 20
Answer:
1.8
Explanation:
Kaya collects the data where the voltage is 6 V also the current is 0.3 A then the resistance in the circuit will be 20 ohms. Hence, option D is correct.
What is Electrical energy?When put in an electromagnetic field, charged matter experiences a force due to the fundamental property of electric charge. Positive or negative electrical ions are possible. When two charges are in opposition to one another, they repel one another.
The term "neutral" refers to an object that has no net charge. The early understanding of the way charged particles interact is now referred to as classical electrodynamics, and it is still true for issues that do not demand taking into account quant phenomena.
As per the given information in the question,
Voltage, V = 6 V
Current, I = 0.3 A
Use the equation of ohm's law,
V = RI
6 V = R(0.3)
R = 6/0.3
R = 20 Ω.
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Which of the following are unchanged by a chemical reaction?
O
A. Products
B. Reactants
O
c. Catalysts
O
D. Energy
In a chemical reaction, c. catalysts are the substances that remain unchanged after the reaction completes as they only facilitate the reaction without being consumed.
The substances that are unchanged by a chemical reaction are the catalysts. Catalysts are substances that increase the rate of a chemical reaction without being consumed or altered in the process. They do this by lowering the activation energy needed for the reaction to proceed, which is the minimum amount of energy required to initiate the reaction.
Unlike reactants, which are the chemicals before the reaction starts and are found on the left of the arrow, and products, which are the chemicals after the reaction ends and are found on the right of the arrow, catalysts remain unchanged after the reaction is complete. Therefore, c. catalysts fit the description of being unchanged in a chemical reaction.
What is radioactivity?
A. The movement of electrons around an atomic nucleus
B.The emission of high-energy particles or waves from atoms
C.A term that describes the forces that hold atomic nuclei
together
D.The application of heat energy to an atomic nucleus
Answer:
B. The emission of high-energy particles or waves from atoms
Explanation:
What do you want to learn about simple machines? (could someone come up with a question about simple machines for me)
Answer:
what are simple machines lol
Explanation:
10.Which of the following is true about atomic and ionic radii? A. In each period, the element with the lowest atomic number has the smallest ionic radius. B. Ionic radius is greater than atomic radius in an anion. C. The number of protons does not change so there is no difference between radii. D. The element with the lowest atomic number has the largest ionic radius in each group.
Answer:
Ionic radius is greater than atomic radius in an anion.
Option B is correct because ionic radii increase for anions and decrease for cations compared to the neutral parent atoms, due to changes in electron-electron repulsion.
The correct answer to the question about the properties of atomic and ionic radii is B. Ionic radius is greater than atomic radius in an anion. This is because when an atom gains electrons to become an anion, the increase in electron-electron repulsion causes the ion to expand. Conversely, when an atom loses electrons to become a cation, it becomes smaller than the neutral atom because the reduction in electron-electron repulsion allows the remaining electrons to be pulled closer to the nucleus by its unchanging positive charge. This result is consistent with the observations made in the provided information.
The chart shows the voltage of four electric currents.
Which is best supported by the data in the chart?
1
Voltage of Currents
Current
Volts (V)
9.0
1.5
3.0
4.5
O Current w flows at a higher rate than Current Z.
Current Y flows at a lower rate than Current X.
Current X has a lower potential difference than Current
Current Z has a greater potential difference than
Current W.
Answer:
C) Current X has a lower potential difference than Current Y.
Explanation:
1.What is the contour interval of this map?
Answer:
The contour interval of the map is 50