Radium has a half-life of 1,660 years.The number of years until only 1/16th of a sample remains is 6641 years.
Answer: 6641 years
Explanation:
Given that the half-life of Radium is 1660 years. The number of years to be calculated when the sample of radium could just be remained of 1/16th of its part, which can be calculated by the following means,
Half life, [tex]T_{1 / 2}=1660 \text { years }[/tex]
[tex]\frac{N}{N_{0}}=\frac{1}{16}[/tex]
t is the taken time, then,
[tex]\frac{N}{N_{0}}=e^{-\lambda t}[/tex]
[tex]\frac{N}{N_{0}}=e^{\lambda t}[/tex]
Taking ln on both sides, we get,
[tex]\lambda t=\ln \left(\frac{N}{N_{0}}\right)[/tex]
[tex]t=\frac{1}{\lambda} \ln \left(\frac{N_{0}}{N}\right)[/tex]
[tex]=\frac{T_{1 / 2}}{0.693}\left(\ln \left(\frac{N_{0}}{N}\right)\right)[/tex]
By substituting the given values,
[tex]t = \frac{1660}{0.693}(\ln 16)[/tex]
Therefore, t = 6641 years
Liam and Melinda have completed one trial testing the freezing point of several solutions, but they cannot agree on what to do next in their experiment. What should be the next step in their investigation? A. repetition, completing more trials for each solution B. analysis, determining whether their data and precise and accurate C. further investigation, testing new solutions and comparing them to their original data D. replication, asking about their classmates’ findings to compare data
Answer:
A. repetition, completing more trials for each solution
Explanation:
In this experiment, the two differ in results that is why they ca not agree on the next step.This happens when experimental results do not confirm the hypothesis of the experiment.In such cases, you are required to assess the stages in the experiment which are- the hypothesis, the experimental stages,the analysis stage and the result stage.The key here is to go through the write up of the experiment to see the problems that cause the variations in results.
In this case where they were testing the freezing points of several solutions, there are four cognitive properties of a solution that affects the solvent. They are lowering of vapor pressure, lowering of freezing point, rise in boiling point or initiation of an osmotic pressure in the process.When they perform more trials for each solution, they will see if they carried out the experiment correctly.
Answer:
A. Repetition, completing more trials for each solution
Explanation:
Just got it right on Edg :)
which compound is composed of oppositely charged ions
I believe your answer is Ionic solids.
Which factors are used to calculate the kinetic energy of an object? Check all that apply. gravity velocity volume mass height
Quantities that determine the kinetic energy of a body are its mass and velocity
Answer: mass and velocity
Explanation:
The kinetic energy of a body is the energy possessed by an object by virtue of its motion. It is given by the equation
[tex]k= \frac{1}{2}mv^2[/tex]
Where m represents mass of the body and v represents its velocity.
Two bodies of equal velocity but different mass the heavier body will have greater kinetic energy. When an object is at rest its velocity is equal to zero. Thus its kinetic energy will be zero. Hence it can be concluded that only moving bodies have kinetic energy.
Stationary objects placed at a height possess potential energy which is the energy by virtue of their position or configuration. The total mechanical energy of a system is the sum of potential and kinetic energy.
scientific notation for 7890
L
2.1.2 Quiz: Physical Fitness
Question 2 of 10
3 Points
A healthy body weight is associated with a low BMI.
O A. True
OB. False
We can confirm that the statement made in the question is in fact true, a healthy body weight is associated with a low BMI.
Why is a low BMI healthy?BMI is the acronym for "Body Mass Index". This is a measurement that indicates the fat contents of the body of the individual being measured. A low BMI is associated with healthy body weight as it indicated low levels of fat. Anything below 25% is considered to be acceptable, while anything below 15% is considered to be fit/athletic.
Therefore, we can confirm that this statement is in fact true, as a low BMI indicates low fat levels and therefore is associated with healthy body weight.
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The statement associating a low BMI with a healthy body weight is false. A healthy body weight, as indicated by BMI, falls within the 18-24.9 range. However, BMI is an imperfect measure and can be misleading due to its disregard for muscle mass, fat distribution, and bone density.
Explanation:The statement that a healthy body weight is associated with a low body mass index (BMI) is False. A healthy body weight, as indicated by BMI, falls within a range. A BMI ranging from 18-24.9 is considered normal weight, 25-29.9 is considered overweight, and a BMI greater than 30 is considered obese. However, BMI has its limitations. It does not account for muscle mass, fat distribution, or bone density, which can lead to inaccuracies in determining actual health status. A muscular person may have a high BMI but low body fat, while an individual with less muscle mass might have a lower BMI but higher body fat percentage.
The tallest sequoia sempervirens tree in California’s redwood national parks is 111 m tall. Suppose an object is thrown downward from the top of that tree with a certain initial velocity. If the object reaches the ground in 3.80 s, what is the objects initial velocity?
The object's initial velocity is equal to [tex]-10.59\frac{m}{s}[/tex]
Why?
From the statement we know the height of the tree and the time it takes to reach the ground, so, if we need to calculate its initial velocity, we can use the following formula:
[tex]y=y_o-v_{o}*t-\frac{1}{2}g*t^{2}[/tex]
Where,
y, is the final height (0 meters in this case)
yo, is the initial height (111 meters in this case)
t, is the time elapsed (3.8 seconds in this case)
vo, is the initial speed.
g, is the acceleration due to gravity (-9.81 m/s2)
Now, let's set the origin at the top of the tree, so, rewriting the formula, we have:
[tex]y=y_o+v_{o}*t+\frac{1}{2}g*t^{2}[/tex]
So, isolating the initial velocity, we have:
[tex]y=y_o+v_{o}*t+\frac{1}{2}g*t^{2}[/tex]
[tex]y=y_o+v_{o}*t+\frac{1}{2}g*t^{2}\\\\v_{o}*t=y-y_o-\frac{1}{2}g*t^{2}\\\\v_{o}=\frac{y-y_o-\frac{1}{2}g*t^{2}}{t}[/tex]
Finally, substituting and calculating, we have:
[tex]v_{o}=\frac{-111m-0-\frac{1}{2}(-9.8\frac{m}{s^{2}}) *(3.8s)^{2})}{3.8s}\\\\v_{o}=\frac{-111m-\frac{1}{2}(-9.8\frac{m}{s^{2}})*(14.44s^{2})}{3.8s}\\\\v_{o}=\frac{-111m-\frac{1}{2}(-141.51m)}{3.8s}=\frac{-111m+70.75m}{3.8s}\\\\v_{o}=\frac{-40.25m}{3.8s}=-10.59\frac{m}{s}[/tex]
Hence, we have that the initial velocity of the object is [tex]-10.59\frac{m}{s}[/tex]
Have a nice day!
Two 6.0 kg masses are separated by a distance of 4.0 m. What is the magnitude of the gravitational force between the two masses?
Answer: [tex]1.50075*10^{-10}\ N[/tex]
Explanation:
For this exercise we need to use the Gravitational Force Formula. This is:
[tex]F_g=G(\frac{m_1*m_2}{r^2})[/tex]
Where [tex]F_g[/tex] is the gravitational force between two objects, [tex]G[/tex] is the gravitational constant ([tex]G=6.67*10^{-11}\ \frac{Nm^2}{kg^2}[/tex]) and [tex]r[/tex] is the distance between the objects.
We know that:
[tex]m_1=6.0\ kg\\\\m_2=6.0\ kg\\\\r=4.0\ m[/tex]
Therefore, in order to calculate the magnitude of the gravitational force between the two masses, we must substitute these values into the formula.
Then we get:
[tex]F_g=(G=6.67*10^{-11}\ \frac{Nm^2}{kg^2})(\frac{(6.0\ kg)(6.0\ kg)}{(4.0\ m)^2})\\\\F_g=1.50075*10^{-10}\ N[/tex]
what would happen when an inflated balloon is place in an ice bath and the atmosphere pressure has not changed?
The inflated balloon shrinks when it is placed in an ice bath with no change in atmospheric pressure.
Explanation:
When the inflated balloon is subjected to an ice bath, it shrinks. This is due to the fact that smaller volume gets occupied by the air/gas inside the balloon as the temperature decreases. Hence, causes the balloon walls to collapse.
An ice bath also lowers the overall air temperature of the balloon inside. As the temperature decreases, the air molecules move more slowly and with lower energy. Because of the particle's lower energy, their collisions with the walls are not enough to keep the inflated balloon.
A scientific hypothesis starts with the lowest level of acceptance but can become stronger as they are used and survive repeated testing.
1)True
2)False
Answer:
True.
Explanation:
Hypotheses are supposed to be tested, to be proven correct. They usually start from a small thought without 100% correct, but as you do further testing, they become stronger.
Answer: 1)True
Explanation:
A scientific hypothesis is a statement which is based on the the direct observation of a scientific event, process or phenomena. It can be based on the assumptions. It is testified using appropriate scientific methodology.
The scientific hypothesis can be proved to be negative or false but repeated experimental trials can prove a hypothesis true and acceptable.
one car moving in a straight line covers one third distance in 20km/h and rest in 60km/h . find the average speed
Answer:
36 km/h
Explanation:
If d is the total distance, then the time spent driving at 20 km/h is:
t₁ = (d/3) / 20
t₁ = d / 60
And the time spent driving at 60 km/h is:
t₂ = (2d/3) / 60
t₂ = d / 90
So the total time is:
t = t₁ + t₂
t = d/60 + d/90
t = d/36
The average speed is the total distance divided by total time:
s = d / t
s = d / (d/36)
s = 36
The average speed is 36 km/h.
which would be an example of biopsychology
Answer:
It is just how your body works, like how your nervous system works. In other words, it is your structure and fuctions of cells in your body of the nervous system.
Hope this helps!
Answer:
a psychiatrist prescribes medication for depression
Explanation:
i just had this question and it was correct
How long does it take a car to go 1000 m if it is going at 50 m/sec?
The car would take 20 seconds to go 1000 meters. This can be found by dividing 1000 by 50.
If you need more help, comment below and I will be happy to assist.
1. Answer true or false to the following:
A ball rolling on a flat table has a horizontal but no vertical
component of motion.
A rock falling straight downward with no wind blowing has no
horizontal component of motion.
A baseball hit into the air toward right field has vertical but no
horizontal component of motion.
A basketball bounced straight up and down has vertical but no
horizontal component of motion.
Ball -- true
Rock -- true
Baseball -- False
Basketball -- true
All the statements are true except the third statement related to baseball hit into the air toward right field has vertical but no horizontal component of motion.
True- A ball rolling on a flat table has a horizontal but no vertical component of motion.
True- A rock falling straight downward with no wind blowing has no horizontal component of motion.
False- A baseball hit into the air toward right field has vertical but no horizontal component of motion.
True- A basketball bounced straight up and down has vertical but no horizontal component of motion.
Answer: Option true 1, 2, 4, and false 3
Explanation:
For the first statement of ball rolling on a flat table, as the table was flat, the acceleration due to gravity may not be acting on the ball kept on the table. When external push is given on the ball kept on the flat table, the ball will be moving along the direction of the push and not perpendicular to the direction of push.
So, the statement 1 is true. Similarly, the motion of rock as well as basketball in a straight up and down direction exhibit only the vertical component as both of them will be moving due to acceleration due to gravity.
So, the second and last statement is also true. But in case of baseball hitting the air toward right field means the ball is made to hit at a particular angle. So as the baseball will follow a path of parabola it will have only horizontal component of motion and not vertical component of motion. So the third statement is false.
Which of the following statements has NOT been indicated by research on food and hunger behaviors?
A) Forcing children to eat specific foods often has a negative effect on food preference.
B) People usually consume larger amounts of food in social settings.
C) Stress may cause people to decrease their craving for carbohydrates.
D) Children are more likely to eat certain foods after seeing a parent eat them
The statements have not been indicated by research on food and hunger behaviors is stress may cause people to decrease their craving for carbohydrates. Therefore, option C is correct.
What are carbohydrates ?Carbohydrates are organic compounds that provide energy to living cells. They are carbon, hydrogen, and oxygen compounds with a hydrogen-to-oxygen ratio of two. Carbohydrates, which we consume, are derived from plant photosynthesis.
They are composed of carbon, hydrogen, and oxygen and are primarily used for energy by living things. Sugars are simple carbohydrates, such as glucose, that living situations' cells use for energy.
The statements have not been indicated by research on food and hunger behaviors is stress may cause people to decrease their craving for carbohydrates.
Thus, option C is correct.
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The correct answer is C) Stress may cause people to decrease their craving for carbohydrates, as research shows stress often increases cravings for comfort foods high in sugar and fat.
Research on food and hunger behaviors has indicated several facts about how we eat and what influences our eating habits. Let's examine each statement one by one:
A) Forcing children to eat specific foods often has a negative effect on food preference: This is supported by research showing that pressuring children to eat specific foods can lead to aversions rather than preferences.B) People usually consume larger amounts of food in social settings: Studies indicate that social settings encourage increased food consumption due to various social cues and norms.C) Stress may cause people to decrease their craving for carbohydrates: This statement is NOT supported by research. In fact, research indicates that stress often leads to increased cravings for carbohydrates, as people tend to seek comfort foods that are high in sugar and fat to alleviate stress.D) Children are more likely to eat certain foods after seeing a parent eat them: Observational learning plays a significant role in children's eating behaviors, so this statement is consistent with research findings.Therefore, the correct answer is C) Stress may cause people to decrease their craving for carbohydrates.
A car in motion has kinetic energy. What happens to the kinetic energy when the car brakes to a stop? The kinetic energy is transformed into potential energy ready to be released when the car starts back up. The kinetic energy is lost since energy is not conserved. The kinetic energy is transformed into heat energy evident by the warmth of the tires and is dissipated. The kinetic energy is still there, it is just not observable.
When a car brakes to a stop, its kinetic energy is transformed primarily into thermal energy due to friction. The brakes and tires may become warm as a result of this energy conversion. Energy is neither lost nor does it become unobservable potential energy; it simply changes form in accordance with the law of conservation of energy.
Explanation:When a car brakes to a stop, its kinetic energy is transformed into other forms of energy. This is a fundamental concept in physics related to the conservation of energy, which tells us that energy cannot be created or destroyed, only transformed from one form to another. In the case of a car stopping, the kinetic energy is mostly converted into thermal energy due to the friction between the car's brakes and wheels. This energy transfer can cause the brakes and tires to warm up, and it is why they may feel hot after use. Additionally, some of the energy may be transferred to the surroundings as the car interacts with the air, causing air movement and sound.
The explanation that kinetic energy is transformed into potential energy to be used later is incorrect. Potential energy is related to an object's position in a gravitational field, not its motion. Thus, when the car stops, its kinetic energy does not become potential energy. Similarly, saying that the kinetic energy is still there but not observable is also incorrect, as the kinetic energy has been converted into other forms. The idea that kinetic energy is lost and not conserved is also a misconception because energy conservation is a fundamental law of physics.
Final answer:
When a car brakes to a stop, the kinetic energy is transformed into heat energy through friction.
Explanation:
When a car brakes to a stop, the kinetic energy of the car is transformed into heat energy. The brakes use friction to reduce the car's speed, and as a result, the kinetic energy is converted into heat energy. This can be observed by the warmth of the tires and the fact that the brakes can become very hot after coming to a stop.
A baseball is popped straight up into the air and has a hang-time of 6.25 S.
Determine the height to which the ball rises before it reaches its peak. (Hint: the
time to rise to the peak is one-half the total hang-time.)
Answer:
47.9 m
Explanation:
Given:
y₀ = 0 m
t = 6.25/2 = 3.125 s
v = 0 m/s
a = -9.8 m/s²
Find: y
y = y₀ + vt − ½ at²
y = 0 + (0)(3.125) − ½ (-9.8)(3.125)²
y = 47.9 m
We have that for the Question "A baseball is popped straight up into the air and has a hang-time of 6.25 S.
Determine the height to which the ball rises before it reaches its peak. (Hint: the time to rise to the peak is one-half the total hang-time.)" it can be said that Hence, the height to which the ball rises before it reaches its peak is
S=47.85m
From the question we are told
A baseball is popped straight up into the air and has a hang-time of 6.25 S.
Determine the height to which the ball rises before it reaches its peak. (Hint: the time to rise to the peak is one-half the total hang-time.)
Generally the Newtons equation for the distance is mathematically given as
[tex]s=ut+1/2at^2\\\\\ Where \\\\T=\frac{6.25}{2}\\\\T=3.125\\\\[/tex]
Therefore
[tex]s=0+1/2(9.8)(3.125)^2[/tex]
S=47.85m
Hence, the height to which the ball rises before it reaches its peak is
S=47.85m
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What force would be needed to make a 10kg bowling ball accelerate down the alleyway with an acceleration of 3m/s2
Answer:
30 N
Explanation:
From Newton's second law:
F = ma
F = (10 kg) (3 m/s²)
F = 30 N
Answer:
F = 30 N
Explanation:
F = (10 kg) (3 m/s²)
F= ma
m= 10 kg
a= 3 m/s^2
Why did Aristotle’s theory of everything falling to its “natural place” last more than 1,000 years even though it was incorrect?
No one else pointed out the inconsistencies in the theory.
He had patented the idea and held a copyright on this theory.
The idea of the Sun as the center of the solar system was not yet established.
His framework of thought was very robust, despite the strangeness of his conclusion.
Aristotle's theory of everything falling to its 'natural place' lasted more than 1,000 years for various reasons, including limited scientific knowledge and the robustness of his framework of thought.
Aristotle's theory of everything falling to its 'natural place' lasted more than 1,000 years even though it was incorrect for several reasons. One reason is that no one else pointed out the inconsistencies in the theory, as scientific methods and knowledge were limited during that time. Additionally, the idea of the Sun as the center of the solar system was not yet established, so alternative explanations were scarce. Finally, despite the strangeness of his conclusion, Aristotle's framework of thought was very robust, which may have contributed to the longevity of his theory.
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What must you do to calculate a meaningful value of distance from the following equation?
d= (0.90km) + (12.5km)/h x (31.5s)
-Convert the kilometers to meters.
-Convert the kilometers to miles.
-Drop the symbols for the units.
-Convert all the times to either hours or seconds.
Answer:
Convert all the times to either hours or seconds
Explanation:
One time unit is in hours, and the other is in seconds. In order to do the math, the units need to be the same. So you either need to convert hours to seconds, or seconds to hours.
Answer:
-Convert all the times to either hours or seconds.
Explanation:
Given,
[tex]d= (0.90km) + (12.5km/h) \times (31.5s)[/tex]
While doing a mathematical calculation all the units should be same otherwise the result will not be correct. Here two units of time i.e. second and hour are being used. We will convert the second to hour by dividing it by 3600 as there are 3600 seconds in one hour. The distance will be,
[tex]d= (0.90km) + (12.5km/h) \times (\frac{31.5}{3600}h)[/tex]
[tex]d= 0.90 + 12.5 \times \frac{31.5}{3600}[/tex]
[tex]d= 0.90 + \frac{393.75}{3600}[/tex]
[tex]d= 0.90 + 0.109[/tex]
[tex]d= 1.009 km[/tex]
Earth’s gravity keeps the moon in orbit by pulling on it.
What does the moon’s gravity do?
A. pulls back on the Earth
B. can only pull on smaller objects such as asteroids but has no effect on the Earth
C. doesn´t affect anything
D. pushes the moon away from the Earth
Answer:
A. pulls back on the Earth, which is the main cause of the rise and fall of the ocean tides on Earth.
The moon’s gravity pulls back on the Earth. Therefore, option (A) is correct.
What is the moon's gravity?The Moon's gravity can be described as the acceleration due to gravity on the surface of the Moon. The value of g on the Moon can be calculated by considering the mass of the Moon and earth.
The mass of the Moon is equal to 7.342 x 10²² kg which is 1.2% of the mass of the earth and the radius of the Moon = 1.74 x 10⁶ m
Since the formula to calculate the value of g = GM/r2
The value of the g for the Moon is equal to 1.652 m/s² which is 16.7 % of the gravity of the earth.
The moon's gravity on the Earth is the reason for the rise and fall of ocean tides. The moon's gravitational pull arises two bulges of water on the oceans of the earth in which one where ocean waters face the moon and the pull is strongest and another where ocean waters face away from the moon and the pull is weakest.
Therefore, the gravity of the moon pulling back on the Earth is the correct option.
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Which of the following best describes gravitational force?
An attraction between two objects that have mass
An attraction between two objects due to their electrons
The force that keeps atoms and molecules bound together
The force that keeps objects from moving when they are at rest
Answer:
2
Explanation:
Answer:
A. An attraction between two objects that have mass
Explanation:
i looked it up lol
An oxidation reaction is a reaction between ______________& ___________.
A. Water and oxygen.
B. Oxygen and an oxyacid.
C. Metal and an oxyacid.
D. Metal and oxygen
Answer:
Oxygen and an oxyacid.
Explanation:
Water doesn't have much to do with oxidation, and things other than metal oxidize. Through the process of elimination and taking a chemistry class, I can say the answer is most likely B.
A basketball rolls onto the court with a speed of
4
.
0
m
s
4.0
s
m
4, point, 0, space, start fraction, m, divided by, s, end fraction to the right, and slows down with a constant acceleration of
0
.
5
0
m
s
2
0.50
s
2
m
0, point, 50, space, start fraction, m, divided by, s, start superscript, 2, end superscript, end fraction over
1
4
m
14m14, space, m.
What is the velocity of the basketball after rolling for
1
4
m
14m14, space, m?
Answer:
5.48 m/s
Explanation:
We can find the final velocity of the basketball by using the SUVAT equation:
[tex]v^2 - u^2 = 2ad[/tex]
where
v is the final velocity
u = 4.0 m/s is the initial velocity
[tex]a=0.50 m/s^2[/tex] is the acceleration
d = 14 m is the distance covered
Solving the equation for v, we find:
[tex]v=\sqrt{u^2 +2ad}=\sqrt{4.0^2+2(0.50)(14)}=5.48 m/s[/tex]
What is the importance of vectors quantities and how they help engineers, pilots, navigators and geographer
Answer:
Scalar and vector quantities are used by the mathematicians, geographers and engineers to relate and represent the physical variables in terms of magnitude and direction. The quantity which has both magnitude and direction is called as vectors. Scientists in space station also use them for navigation or when they are launching or exploding a material to define its direction which makes easier for them to navigate. There are many types pf vectors depending upon its property they are used in various applications.
A car is traveling at an average speed of 70
m/s. How many km would the car travel in
6.5 hrs?
A car is traveling at an average speed of 70 m/s, the car would travel approximately 1638 kilometers in 6.5 hours at an average speed of 70 m/s.
To calculate the distance traveled by the car, we can use the formula:
[tex]\[ \text{Distance} = \text{Speed} \times \text{Time} \][/tex]
Given:
Average speed of the car: [tex]\(70 \, \text{m/s}\)[/tex]
Time: [tex]\(6.5 \, \text{hrs}\)[/tex]
First, let's convert the time from hours to seconds, as the speed is given in meters per second:
[tex]\[ \text{Time in seconds} = \text{Time in hours} \times 3600 \, \text{s/hr} \][/tex]
[tex]\[ \text{Time in seconds} = 6.5 \times 3600 \, \text{s} \][/tex]
Now we can use the formula to calculate the distance traveled:
[tex]\[ \text{Distance} = 70 \times \text{Time in seconds} \][/tex]
Finally, let's convert the distance from meters to kilometers:
[tex]\[ \text{Distance in kilometers} = \frac{\text{Distance in meters}}{1000} \][/tex]
Substitute the calculated values:
[tex]\[ \text{Distance in kilometers} = \frac{70 \times 6.5 \times 3600}{1000} \][/tex]
[tex]\[ \text{Distance in kilometers} \approx 1638 \, \text{km} \][/tex]
Thus, the car would travel approximately 1638 kilometers in 6.5 hours at an average speed of 70 m/s.
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A 210-kg woorden raft floats on a lake. When a 75-kg man stands on the raft, it sinks 5.0 cm deeper into the water. When he steps off, the raft vibraties for a while. A. What is the frequency of vibration? B. What is the total energy of vibration? Hint: ignore damping.
Answer:
A: The frequency of the vibration is 1.3329 Hz
B: The total energy of the vibration is 18.39375 J
Explanation:
The force of the man his weight causes the raft to sink, and that causes the water to put a larger upward force on the raft. This extra force is a restoring force, because it is in the opposite direction of the force put on the raft by the man. Then when the man steps off, the restoring force pushes upward on the raft, and thus the raft – water system acts like a spring, with a spring constant found as follows:
k= F/x = ((75 kg) * (9.81 m/s²))/(5*10^-2 m) = 14715 N/m
The frequency of the vibration is determined by the spring constant (k) and the mass of the raft (210kg).
fn = 1/2π * √(k/m) = 1/2π * √(14715 / 210) = 1.3329 Hz
The frequency of the vibration is 1.3329 Hz
b)
Since the gravitational potential energy can be ignored, the total energy will be :
Etot = 1/2 k* A² = 1/2 * (14715 )*(0.05)² = 18.39375 J
The total energy of the vibration is 18.39375 J
Stephanie is riding her bicycle to the park. The chemical energy used to pedal the bicycle is transformed into __________.
Answer:
MECHANICAL ENERGYExplanation:
when you use mechanical energy you are use kinetic energy and potential energy at the same time.
When pedaling the bike is transforming chemical energy, supplied by the breakdown of the food you eat, into mechanical energy to turn the pedals. The chemical energy is potential and the mechanical energy is kinetic
Dalton’s completing an investigation in the science lab. He observes that a sample of liquid turns to gas at 135°C. What’s this temperature called? A. boiling point B. freezing point C. melting point D. room temperature E. standard temperature
The temperature at which the sample of liquid turns to gas at 135 °C is termed as boiling point.
Answer: Option A
Explanation:
The observation of conversion of liquid to gas indicates that there is occurrence of change in the state of matter. The inter-conversion from one state to another can be done by either varying the temperature or by varying the pressure.
In this case, the liquid on heating gets converted to gaseous state after attaining a particular temperature say 135 °C. So, this process of conversion from liquid to gaseous state on heating is termed as boiling.
The temperature at which a liquid converts to gas is termed as the boiling point of that liquid.
Answer:
option a
Explanation:
An object's motion changes
A.
only when a nonzero net force is applied to the object.
B.
only if the object is at rest when a force acts upon it.
C.
when the forces acting on the object remain balanced.
D.
when there are no forces acting upon it.
Answer:A.
only when a nonzero net force is applied to the object.
Explanation:
Answer:
he is right its A
Explanation:
A bike that is coasting down a steep hill increases its speed from 8.0 m/s to 14 m/s. The length of the hill is 55 meters. How much time passes during the descent?
t=5s
it was correct on my do-now
so I hope it was useful for you
Answer:
Time, t = 5 seconds
Explanation:
It is given that,
Initial speed of the bike, u = 8 m/s
Final speed of the bike, v = 14 m/s
Length of the hill, d = 55 m
Firstly, we can find the acceleration of the bike. Let it is equal to a. It can be calculated using third equation of motion as :
[tex]a=\dfrac{v^2-u^2}{2d}[/tex]
[tex]a=\dfrac{(14)^2-(8)^2}{2\times 55}[/tex]
[tex]a=1.2\ m/s^2[/tex]
Let t is the time passes during the descent. It can be calculated using the first equation of motion as :
[tex]t=\dfrac{v-u}{a}[/tex]
[tex]t=\dfrac{14-8}{1.2}[/tex]
t = 5 seconds
So, the time passes during the descent is 5 seconds. Hence, this is the required solution.