1. How is 0.00069 written in scientific notation? (1 point).
O 69x10--
06.9x104
O 0.69x107
0692104​

Answer:

mass number of 38

Explanation:

Charge is 0 - No. of protons is equal to nom.of electrons, so no charge

Atomic number is 18 - Atomic number is number of protons

Mass number is 38- mass number is number of protons AND neutrons

Answer:

a mass number of 38

Explanation:

X This atom has no a negative charge .

because, number of  protons (18) & electrons (18) are same. so,This atom is neutral.

X This atom has an atomic number of 20.

Because, it has 18 protons. so, This atom has an atomic number of 18.

X  This atom has a positive charge

because, number of  protons (18) & electrons (18) are same.so,This atom is neutral.

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.

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, 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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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!

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.                                                      

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.  

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.

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]

I believe your answer is Ionic solids.

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

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.

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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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]

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.

Answer:A.

only when a nonzero net force is applied to the object.

Explanation:

Answer:

he is right its A

Explanation:

Answer:

2

Explanation:

Answer:

A. An attraction between two objects that have mass

Explanation:

i looked it up lol

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.

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.

Answer:

Explanation:

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

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.

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:

Therefore, the correct answer is C) Stress may cause people to decrease their craving for carbohydrates.

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

We can confirm that the statement made in the question is in fact true, a healthy body weight is associated with a low BMI.

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.

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.

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.

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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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 :)

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.

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]

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.

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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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