Answer:
A cube of wood is 3 cm on each side. It has a mass of 27 g. What is its density?The volume of a cube is given by s^3. So the volume of this block is 3cm x 3cm x3 cm = 27 cm^3. density = mass/volume =27 g / 27 cm^3 = 1 g/cm^3. the answer is 1 g/cm^3.
What is the mass of a billiard ball that has a volume of 100 cm³ and a density of 2.5 g/cm³?what is the density of a billiard ball that has a volume of 100cm cubed and a mass of 250g? Density = 250g / 100cm^3 = 2.5 g/cm^3.
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an organ pipe open at both ends has a length of 0.8 m. if the velocity of sound in air is 340m/s, what is the frequency of the second harmonic wave (in hz)?
The frequency of the second harmonic wave is 425 Hz
The length of the pipe = 0.8 m
The velocity of the sound = 340 m/s
The frequency of the second harmonic wave can be found using the formula,
v₂ = 2 v₁
where v₂ is the frequency of the second harmonic wave
v₁ is the fundamental frequency
So, the fundamental frequency can be found using the formula
v₁ = v / 2L
where v is the velocity of the sound
L is the length of the pipe
Let us substitute the known values in the above equation, we get
v₁ = 340 / 2 x 0.8
= 340 / 1.6
= 212.5 Hz
Then, the frequency of the second harmonic wave is
v₂ = 2 x 212.5
= 425 Hz
Therefore, the frequency is 425 Hz
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List some endurance training exercises.
Answer:
•Walking briskly
• Running /jogging
•Dancing
•biking
while a rock thrown upward at 50 degrees to the horizontal rises, neglecting air drag, its horizontal component of velocity remains unchanged. decreases. increases.
While a rock thrown upward at 50 degrees to the horizontal rises, neglecting air drag, its horizontal component of velocity remains unchanged.
The horizontal component of velocity refers to the velocity in the horizontal direction, which is perpendicular to the vertical direction of the rock's motion. Neglecting air drag means that no external force acts on the horizontal component of velocity. According to Newton's first law of motion, an object in motion will continue to move at a constant velocity in the absence of external forces.
In this case, as the rock rises vertically, its horizontal component of velocity remains unaffected by the vertical motion. The force of gravity acts vertically downward and does not affect the horizontal motion of the rock. Therefore, the horizontal component of velocity remains unchanged throughout the rock's upward trajectory.
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An air-track glider attached to a spring oscillates between the
10 cm mark and the 60 cm mark on the track. The glider completes 10 oscillations in 33 s. What are the (a) period. (b) frequency,
(c) angular frequency.(d) amplitude. and (c) maximum speed of
the glider
(a) The period of the glider's oscillation is 3.3 seconds. ,(b) The frequency of the glider's oscillation is 0.303 Hz. ,(c) The angular frequency of the glider's oscillation is 1.905 rad/s. ,(d) The amplitude of the glider's oscillation is 25 cm. ,(e) The maximum speed of the glider is 0.477 m/s.
(a) To find the period, we divide the total time by the number of oscillations: Period = Total time / Number of oscillations = 33 s / 10 = 3.3 s.
(b) The frequency is the reciprocal of the period: Frequency = 1 / Period
= 1 / 3.3 s
≈ 0.303 Hz.
(c) The angular frequency is the product of 2π and the frequency: Angular frequency = 2π × Frequency
= 2π × 0.303 Hz
≈ 1.905 rad/s.
(d) The amplitude is half the difference between the maximum and minimum positions: Amplitude = (60 cm - 10 cm) / 2
= 25 cm.
(e) The maximum speed occurs when the glider passes through the equilibrium position. The maximum speed can be calculated by multiplying the amplitude by the angular frequency:
Maximum speed = Amplitude × Angular frequency
= 0.25 m × 1.905 rad/s
≈ 0.477 m/s.
The glider's oscillation has a period of 3.3 seconds, a frequency of 0.303 Hz, an angular frequency of 1.905 rad/s, an amplitude of 25 cm, and a maximum speed of 0.477 m/s. These values describe the motion of the glider as it oscillates between the 10 cm and 60 cm marks on the air-track.
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A colege language class was chosen for a leaming experiment. Using a list of 50 woeds, the experiment measured the rate of vocabulary memorizatcon at different times during a continuous 6-hour study session. The average rate of leaning for the entie cless was inversoly proporional to the time spent studying, and was given approximately by V ( t)= t
13
for 1 sis 6 . Find the area betiven the greph of V l
and the f-axis ovor the interval {3,5], and interpret the retuts. The area botween the arsh of V ′
and the faxis over the interval (3,5) is appeorimathy (Round to the nearns whole number as necded)
A well designed experimen tests multiple variables at once supports your hypothesis does not need multiple trials is controlled to only test one variable Given that a college language class was chosen for a learning experiment. Using a list of 50 words,
the experiment measured the rate of vocabulary memorization at different times during a continuous 6-hour study session. The average rate of learning for the entire class was inversely proportional to the time spent studying, and was given approximately by V(t) = t^(−13) for 1 ≤ t ≤ 6.
We need to find the area between the graph of V(t) and the f-axis over the interval [3, 5], and interpret the results. The area between the graph of V(t) and the f-axis over the interval [3, 5] can be found as follows:∫[3,5]V(t)dt = ∫[3,5]t^(−13)dt = [−12t^(−12)]3 5= −12(5^(−12)−3^(−12))≈ 0.54The area between the graph of V′(t) and the f-axis over the interval (3, 5) can be found as follows: V′(t) = −t^(−14) ∴ ∫(3,5)V′(t)dt = −(5^(−14)−3^(−14))≈ 0.104Thus
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An Olympic high diver has gravitational potential energy because of her height. As she dives, what becomes of her energy just before she hits the water
Just before an Olympic diver hits the water all her potential energy converts into kinetic energy.
Law of conservation of energy states that the total energy of a system remains conserved.
Total mechanical energy = Kinetic energy + Potential energy = Constant.
Thus, the sum of potential energy and kinetic energy for the diver must be constant. So just before she hits the water all her potential energy converts into kinetic energy.
Therefore, just before an Olympic diver hits the water all her potential energy converts into kinetic energy.
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What would be the effect of an increase in greenhouse gas concentration in the atmosphere on Earth's average temperatures?
Answer:
See Explanation
Explanation:
Greenhouse gases are those gases that are believed to trap infrared rays close to the earth surface. Infrared radiation is otherwise known as heat rays due its heating effect.
Increase in the concentration of these greenhouse gases will ultimately lead to a gradual increase in the earth's average temperature. This phenomenon is referred to as global warming.
An object is rolled horizontally off a table. It lands on the floor 1 meter away from the base of the table. The height of the table is 2.5m. What is the initial vertical velocity of the object?
The initial vertical velocity of the object is 2.5 m/s .
How to calculate intial velocity?Initial Velocity, denoted as u, is the velocity at time period t = 0. It is the speed at which motion first occurs. There are four equations for starting velocity: (1) The starting velocity is expressed as u = v - at if time, acceleration, and final velocity are given.
Keep in mind that the INITIAL VERTICAL VELOCITY of the projectile is equal to ZERO because it is launched horizontally.
Given,
base =1m
height = 2.5
vertical velocity =2.5/1
The initial vertical velocity of the object is 2.5 m/s .
A projectile's initial velocity has both a horizontal component and a vertical component if it is thrown at an angle to the horizontal. The projectile's displacement horizontally as a result of velocity is shown by the horizontal velocity component (vx).
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Part A Two 1.5 V batteries in series power a flashlight. A current of 1.0 A flows through the batteries and the bulb. A 1.0 A current (1.0 amp) is defined as the flow of 1.0 C per second. How much work do the batteries do in 1.0 min? Express your answer with the appropriate units.
the total time taken is 60 seconds (1 minute).
Substituting the values in the formula, we get the work done by the batteries as 180 J (Joules).
Given:
Two 1.5 V batteries in series power a flashlight.
A current of 1.0 A flows through the batteries and the bulb.A 1.0 A current (1.0 amp) is defined as the flow of 1.0 C per second.
To find out the work done by the batteries, we will use the formula:
Work = Current x Voltage x Time
(W = I * V * t)
W = 1.0 A x (1.5 V + 1.5 V) x (60 s)W = 1.0 A x 3.0 V x 60 sW = 180 J
The work done by the batteries in 1.0 min is 180 Joules (J).
The formula for calculating work done is:W = I * V * t
WhereW is work done in Joules (J),I is current in amperes (A),V is voltage in volts (V), andt is time in seconds (s).From the given data, we know that the batteries are connected in series, which means that the voltage of each battery adds up.
Hence, the total voltage supplied by the batteries is
1.5 V + 1.5 V = 3.0 V.
The current flowing through the batteries and the bulb is given as 1.0 A for 1 second.
Therefore, the total time taken is 60 seconds (1 minute).
Substituting the values in the formula, we get the work done by the batteries as 180 J (Joules).
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Two 10-cm-diameter charged rings face each other, 20 cm apart. The left ring is charged to -18 nC and the right ring is charged to +18 nC.
Part A What is the magnitude of the electric field at the mi
The magnitude of the electric field at the midpoint between the two charged rings is zero.
What is the magnitude of the electric field at the midpoint between two 10-cm-diameter charged rings, 20 cm apart, with charges of -18 nC and +18 nC respectively?The magnitude of the electric field at the midpoint between two charged rings can be calculated using the principle of superposition.
The electric field at the midpoint will be the sum of the electric fields produced by each ring individually. Since the charges on the rings are equal in magnitude and opposite in sign, the electric fields produced by each ring will have the same magnitude but point in opposite directions.
The electric field produced by a uniformly charged ring at a point on its axis can be calculated using the formula:
\(E = (k * Q * x) / (2 * π * ε * R^2 * (R^2 + x^2)^(3/2))\)
Where:
E is the electric field
k is Coulomb's constant\((8.99 x 10^9 N m^2/C^2)\)
Q is the charge on the ring
x is the distance from the center of the ring to the point on its axis
ε is the permittivity of free space \((8.85 x 10^-12 C^2/N m^2)\)
R is the radius of the ring
Since the rings have the same charge and are equidistant from the midpoint, the electric fields produced by each ring will cancel each other out, resulting in a net electric field of zero at the midpoint. Therefore, the magnitude of the electric field at the midpoint between the two charged rings is zero.
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Based on the information in the table, choose whether the magnetic field is weak or strong
Current Number of Coils Magnetic Field Strength 0. 2 A Many _______________
5. 0 A Many _______________
5. 0 A Few _______________
put weak or strong in the blanks
Answer:
Explanation:
Field characteristics
The strength of the field at the Earth's surface ranges from less than 30 microteslas (0.3 gauss) in an area including most of South America and South Africa to over 60 microteslas (0.6 gauss) around the magnetic poles in northern Canada and south of Australia, and in part of Siberia.
infants typically begin to make vowel-like sounds at around the age of
Infants typically begin to make vowel-like sounds at around 2 to 3 months of age. These sounds are often referred to as cooing or gooing, and are an important part of early language development.
As they continue to grow and develop, infants will begin to experiment with different sounds, including consonants, and will eventually begin to form words and sentences. It is important for caregivers to interact and respond to these sounds, as it helps to build a foundation for language acquisition and communication.
These initial sounds are the building blocks for more advanced language skills, and they help infants to practice their vocalizations while also engaging in social interactions with their caregivers. As infants grow and develop, these sounds will gradually evolve into more complex speech patterns and, eventually, words and sentences.
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What are examples of malicious codes?.
Malicious code examples include computer viruses, worms, Trojan horses, logic bombs, spyware, adware, and backdoor programmes that take advantage of common system flaws. Malicious programmes can enter a system through visiting infected websites or by clicking on a dubious email link or attachment.
What are some cyber awareness instances of harmful code?Viruses, Trojan horses, worms, macros, and scripts are examples of malicious programming. Email attachments, downloading files, and accessing compromised websites may all transmit malicious malware.
Phishing emails are by far the most popular way for hackers and state-sponsored hacking groups to disseminate malware. Hackers have gotten quite good at creating emails that fool recipients into clicking links or downloading files with harmful software.
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28. A wooden flute, open at both ends, is 80 cm long. What is its
fundamental frequency?
Answer:
214.4 hz
Explanation:
fundamental frequency
A girl takes her dog for a walk on a sunny beach. Find the force of gravity between the 45-kg girl and her 11-kg dog when they are separated by a distance of 2.00m
The gravitational force acting between them is \(8.25*10^-^9N\)
Data given;
M1 = 45kgM2 = 11kgr = 2.0mG = \(6.67*10^-^1^1m^3kg^-^1s^-^1\)To solve this question, we need to apply gravitational force or energy formula.
Gravitational ForceThis states that the force of attraction between two bodies is equal to the product of their bodies and inversely proportional to the square of their distance apart.
Mathematically;
\(F = \frac{GM_1M_2}{r^2} \\\)
let's substitute the values and solve
\(F = \frac{Gm_1m_2}{r^2}\\F = \frac{6.67*10^-^1^1 * 45 * 11}{2^2}\\F = 8.25*10^-^9N\)
The force of gravity acting between them is \(8.25*10^-^9N\)
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Calculate 13cm× 15m
1m = 100cm
Multiply.
15 * 100 = 1,500cm
Multiply.
13 * 1500 = 19,500cm
Best of Luck!
Can you show me how to do this
Answer: C. 12
Weight= mass* gravity. Were going to have to do the inverse operation
Mass= weight/gravity^2. So were going to divide.
120/9.81 = 12.2324159021 or 12.
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how can we take advantage of waste materials
Answer:
we can incinerate waste materials and use the product as fuel rather than dumping them. It may produce carbon dioxide but we can create a machine that can convert carbon into energy.
A squirrel standing on a branch shoots an acorn toward a hole in the tree. To determine how the potential energy of the acorn changes in relation to the earth, the position of what two objects must be considered?
a
The position of the acorn and the earth
b
The height of the branch and the position of the acorn
c
The position of the acorn and the width of the hole in the tree
d
The position of the squirrel on the branch and the earth
The positions to be considered are the position of the acorn and the earth.
What is potential energy?The potential energy is the energy that is possessed by a body by virtue of its position. Hence, the potential energy of a body changes as its position changes.
Hence, to determine how the potential energy of the acorn changes in relation to the earth, the positions to be considered are the position of the acorn and the earth.
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equation for progressive wave
Answer:
y(x, t) = A Sin(ωt ± kx)
Explanation:
Waves can be classifies as either stationary (standing), or progressive (travelling). A progressive wave is one the is a traveling wave, transferring energy along its path. While a stationary wave seems not to be moving.
The general equation for a progressive wave is;
y(x, t) = A Sin(ωt ± kx)
Where: A is its amplitude, t is the time, k is the wave number.
When the wave travels in the positive x-axis direction, the equation changes to;
y(x, t) = A Sin(ωt - kx)
When it travels in the negative x- axis direction, the equation becomes;
y(x, t) = A Sin(ωt + kx)
NB: ω = 2\(\pi\)f and k = 2\(\pi\)/λ.
Assuming the height of the hill is 50m calculate
(i) The velocity of the car at the bottom of the hill
(ii) The height at which it will have half this speed. Assume the car starts from west from the top of the hill
(i)The time can be calculated using the equation:
\(d=v0t+1/2\)\(gt^{2}\)
\(v = 0 + 9.8 * 3.19 = 31.3 m/s\)\(t = sqrt(2d/g) = sqrt(2 * 50 / 9.8) = sqrt(10.2) = 3.19s\)
So the velocity of the car at the bottom of the hill is 31.3 m/s.
(ii)To find the height at which the car will have half this speed,
\(v = v0 + gt\)
\(t = (v - v0) / g = (15.65 - 0) / 9.8 = 1.59 s\)
\(d = v0t + (1/2)gt^2\)
where d is the distance traveled, v0 is the initial velocity
\(d = 0 * 1.59 + (1/2) * 9.8 * 1.59^2 = 12.1 m\)
So the car will have half the velocity at the bottom of the hill when it is 12.1 m below the top of the hill.
When an object moves under the influence of gravity, it experiences a constant acceleration due to gravity, which is approximately 9.8 m/\(s^{2}\) on the surface of the Earth.
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what is the smallest separation (in nm) between two slits that will produce a ninth-order maximum for any visible light?
the smallest separation between two slits that will produce a ninth-order maximum for any visible light is approximately **15.75 μm** (micrometers).
To determine the smallest separation between two slits that will produce a ninth-order maximum for any visible light, we can use the formula for the position of the nth-order maximum in a double-slit interference pattern:
y = (nλL) / d
where y is the position of the nth-order maximum, λ is the wavelength of light, L is the distance from the slits to the screen, and d is the separation between the slits.
In this case, we want to find the smallest separation (d) that will produce a ninth-order maximum for any visible light. Visible light has a wavelength range of approximately 400 nm to 700 nm.
Let's assume the worst-case scenario where the wavelength is at the shortest end of the visible light spectrum, which is 400 nm.
For the ninth-order maximum (n = 9), substituting the values into the formula, we get:
400 nm = (9 * λ * L) / d
To find the smallest separation (d), we rearrange the formula:
d = (9 * λ * L) / 400 nm
Since we want the smallest separation, we consider the maximum value for λ (700 nm) and the minimum value for L (the order of magnitude of the size of the interference pattern).
Considering L to be around 1 meter (approximately 1e9 nm), we can substitute the values:
d = (9 * 700 nm * 1e9 nm) / 400 nm
Simplifying the expression, we get:
d ≈ 15.75 μm
Therefore, the smallest separation between two slits that will produce a ninth-order maximum for any visible light is approximately 15.75 μm (micrometers).
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a body mass index of 25.0 to 29.9 in an adult indicates: a. normal weight b. overweight c. underweight d. obesity e. morbid obesity
Answer: Option B: Overweight. A Body Mass Index (BMI) of 25.0 to 29.9 in an adult is considered to be overweight, meaning that the person's weight is higher than what is recommended for their height.
What is Body Mass Index (BMI) ?The body mass index (BMI) is a measurement based on a person's mass (weight) and height. The BMI is calculated by dividing the body weight by the square of the height, and it is expressed in kilograms per square meter (kg/m²) since weight is measured in kilograms and height is measured in meters.
A table or chart that plots BMI as a function of mass and height using contour lines or colors for different BMI categories can be used to calculate BMI. The table or chart may also utilize other units of measurement that are translated to metric units for the computation.
What are the ranges of BMI?Based on tissue mass (muscle, fat, and bone) and height, the BMI is a practical guideline used to roughly classify a person as underweight, normal weight, overweight, or obese. Underweight (under 18.5 ), normal weight (18.5 to 24.9), overweight (25 to 29.9), and obese (30 or more) are the four main adult BMI categories. The BMI has limitations that can make it less useful than some of the alternatives when used to predict an individual's health rather than as a statistical assessment for groups, particularly when applied to people with abdominal obesity, low stature, or very high muscle mass.
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an aluminum flagpole is 39.4 m high. by how much does its length increase as the temperature increases by 15
The length of the aluminum flagpole will increase by 0.00881 m as the temperature increases by 15.
The length of an aluminum flagpole may not change with temperature. While thermal expansion can cause materials to change in size when heated or cooled, aluminium, as a metal, is not significantly affected by temperature changes. As such, the length of an aluminium flagpole is unlikely to be significantly affected by changes in temperature.
Calculate the Coefficient of Linear Expansion for Aluminum
The coefficient of Linear Expansion for aluminum is about 0.000023 per degree Celsius
Calculate the change in length
Change in length = (Coefficient of Linear Expansion x Original Length x Change in Temperature)
Change in length = (0.000023 x 39.4 m x 15) = 0.00881 m
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According to Copernicus, retrograde motion for Venus must occur around: A. Quadrature, when the planet is 90 degrees away from the sun B. Opposition, when the planet lies opposite the sun in the sky C. Greatest elongation, when the planet is farthest from the sun D. Superior conjunction, when the planet is on the far side of the sun E. Inferior conjunction, when it passes between us and the sun
Venus must go backwards around the inferior conjunction. Therefore, option E is correct.
Copernicus' explanation, Retrograde motion is when a planet appears to be moving backward as compared to the background stars. When Venus passes between the Earth and the Sun at the inferior conjunction, Venus begins its retrograde motion.
Venus appears to slow down, stop, and then move backward for a brief time before resuming its usual speed at this time when it is closest to the Earth. This phenomena explains the heliocentric model of solar system.
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Complete question - According to Copernicus, retrograde motion for Venus must occur around:
A. Quadrature, when the planet is 90 degrees away from the sun
B. Opposition, when the planet lies opposite the sun in the sky
C. Greatest elongation, when the planet is farthest from the sun
D. Superior conjunction, when the planet is on the far side of the sun
E. Inferior conjunction, when it passes between us and the sun
Consider the product mix lp. product a product b capacity resource x 8 3 9 resource y 4 9 9 resource z 6 7 9 profit $2 $3 for the product mix a=0 and b=1, which resource is binding?
In the given product mix, with a=0 and b=1, resource Y is the binding resource.
To determine the binding resource, we need to compare the resource utilization for each product in the product mix. The resource utilization is calculated by multiplying the quantity of each product by the amount of the corresponding resource required.
For product A, the resource utilization for resource X is 8 * 0 = 0, for resource Y is 4 * 0 = 0, and for resource Z is 6 * 0 = 0.
For product B, the resource utilization for resource X is 3 * 1 = 3, for resource Y is 9 * 1 = 9, and for resource Z is 7 * 1 = 7.
As we can see, the resource utilization for resource Y is 9 for product B, which is the highest among all resources and products. Therefore, resource Y is the binding resource in this product mix when a=0 and b=1.
This means that the availability of resource Y limits the production and profitability of product B, and any increase in the quantity of product B beyond 9 units would require more of resource Y than is available.
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what is the action force of a bug hitting a windshield?
Answer:
In the interaction between the bus and the bug, we can call the force "bus pushes bug" the action force. Then the force "bug pushes bus" is the reaction force. Since these forces are a Newton's Third Law action/reaction force pair, they are exactly the same size.
Explanation:
Newtons 3rd law
in science, whereas a hypothesis is a tentative explanation of an observation, a is a broader, well-tested explanation for a natural phenomenon backed by many lines of evidence.
In science, a hypothesis is a tentative explanation of an observation, while a scientific theory is a broader, well-tested explanation for a natural phenomenon backed by multiple lines of evidence.
In the scientific method, a hypothesis is an initial explanation or proposed solution to a specific observation or problem. It is often based on limited evidence or previous knowledge and serves as a starting point for further investigation. A hypothesis is testable and can be supported or refuted through experimentation or further observations. It represents a possible explanation that requires empirical evidence to validate or invalidate its validity.
On the other hand, a scientific theory is a well-established and comprehensive explanation for a natural phenomenon that has been extensively tested and supported by multiple lines of evidence. Unlike a hypothesis, a scientific theory goes beyond a single observation or experiment. It encompasses a broad range of observations, experimental results, and logical reasoning. A scientific theory provides a framework that can explain and predict various related phenomena. It is subject to ongoing scrutiny and refinement, but its validity and acceptance are based on its consistency with empirical evidence and its ability to make accurate predictions.
In summary, while a hypothesis is a tentative explanation of an observation, a scientific theory is a broader and well-tested explanation that is supported by multiple lines of evidence and can account for a range of related phenomena.
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Why does the emission of an alpha particle always result in transmutation?
The alpha particles are capable of alternating the mass and atomic numbers in the atoms which is responsible for transmutation. This occurs in nuclear reacting.
Transmutation occurs in any process where the no. of protons or neutrons in the atom are changed. Transmutation occurs when conversion of one element occurs into others. There are three kinds of radiations gamma, beta, and alpha. Both beta and alpha are capable of transmutation as they are capable of changes in the atomic and mass numbers.Learn more about radiation:
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Bill drives west at 20\, \dfrac{\text m}{\text s}20 s m 20, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction, then slows to a stop at the red light. A graph of his velocity over time is shown below, where eastward is the positive velocity direction.
Answer:
This
Explanation:
Khan academy answer