Answer: [tex]5 \frac{g}{cm^{3}}[/tex]
Explanation:
The density [tex]\rho[/tex] of a material is given by:
[tex]\rho=\frac{m}{V}[/tex] (1)
Where:
[tex]m=3645 g[/tex] is the mass of the cube
[tex]V[/tex] is the volume of the cube
Now, the volume of a cube is equal to the length [tex]L[/tex] of its edge to the power of 3:
[tex]V=L^{3}[/tex] (2)
If we know [tex]L=9 cm[/tex], the volume of this cube is:
[tex]V=(9 cm)^{3}=729 cm^{3}[/tex] (3)
Substituting (3) in (1):
[tex]\rho=\frac{3645 g}{729 cm^{3}}[/tex] (4)
[tex]\rho=5 \frac{g}{cm^{3}}[/tex] This is the density of the cube
(HELP ME PLEASE ;-;) The National Academy of Sciences reported that the Earth's surface temperature has risen by about 1 degree Fahrenheit in the past century. This is an example of a change in Earth's
Climate or Weather?
Answer:
Climate
Explanation:
I am pretty sure this is climate because climate is what the temperature over time while weather is what the temperature is today. For example, it may we windy today. That is an example of weather. It is hot in Arizona and Cold in Idaho. This is an example of climate.
Final answer:
The increase of the Earth's surface temperature by about 1 degree Fahrenheit over the past century is an example of a change in Earth's climate, which is a long-term trend, as opposed to weather which is short-term. This change is indicative of global warming and has profound effects on the environment and living organisms.
Explanation:
The National Academy of Sciences report stating that the Earth's surface temperature has risen by about 1 degree Fahrenheit in the past century is an example of a change in Earth's climate. This rise in temperature represents a long-term trend that affects ecosystems, weather patterns, and geological processes on a global scale. In contrast, weather refers to short-term atmospheric conditions. The concept of global warming is closely related to this change, as it describes the increase in Earth's average surface temperature due to activities such as burning fossil fuels which release gases that warm the planet. Notably, the increase in global temperatures has implications for habitats, species survival, and agricultural practices. Regional variations in climate change are expected, with some areas, like the Arctic, experiencing more rapid warming.
Questions
1.1 A rectangular block of wood has dimensions
240 mm x 20.5 cm x 0.040 m. Calculate its
volume in cm
Answer:
1968
Explanation:
2400*20.5*0.004
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.
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.
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.
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.
at what tempreature farenhite scale and celcius scale show the same reading
Answer:
-40°F = -40°C
Explanation:
To convert Celsius to Fahrenheit, the following equation is used:
F = 1.8C + 32
When the temperature on the Fahrenheit scale is the same on the Celsius scale, that means F = C. Substituting:
C = 1.8C + 32
0 = 0.8C + 32
-0.8C = 32
C = -40
Therefore -40°F = -40°C.
Answer:-40°F = -40°C
Explanation:
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.
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]
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.
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.
2. Calculate the average magnitude of the force of gravity on the planet Neptune (mass of 1.02*10^ 26 kg) due to the Sun (mass of 1.99*10^ 30 kg) , assuming an average orbital distance of 4.50*10^ 12 m.
Answer:
The answer to your question is: F = 6.69 x 10²⁰ N
Explanation:
To solve this problem we need to use the Newton's law of universal gravitation.
F = G(m1m2)/r²
where
F = ?
G = 6.674×10−11 N · (m/kg)2 is the gravitational constant
m1 = Neptune mass = 1.02 x 10²⁶ kg
m2 = Sun mass = 1.99 x 10³⁰ kg
r orbital distance among the planets = 4.50 x 10¹² m
Substitution
F = 6.674×10−11 N · (m/kg) x 1.02 x 10²⁶ kg x 1.99 x 10³⁰ kg / (4.50 x 10¹² m)²
F = 1.355 x 10⁴⁶ / 2.025 x 10²⁵
F = 6.69 x 10²⁰ N
The average magnitude of the force of gravity on Neptune due to the Sun is approximately [tex]\( 6.714 \times 10^{20} \, \text{Newtons} \).[/tex]
The average magnitude of the force of gravity F on the planet Neptune due to the Sun can be calculated using Newton's law of universal gravitation, which states that the force between two masses is proportional to the product of their masses and inversely proportional to the square of the distance between their centers. The formula is given by:
[tex]\[ F = G \frac{m_1 m_2}{r^2} \][/tex]
Plugging in the values, we get:
[tex]\[ F = (6.674 \times 10^{-11} \, \text{Nm}^2/\text{kg}^2) \frac{(1.99 \times 10^{30} \, \text{kg}) (1.02 \times 10^{26} \, \text{kg})}{(4.50 \times 10^{12} \, \text{m})^2} \] \[ F = (6.674 \times 10^{-11} \, \text{Nm}^2/\text{kg}^2) \frac{2.03 \times 10^{56} \, \text{kg}^2}{2.025 \times 10^{25} \, \text{m}^2} \] \[ F = 6.697 \times 10^{-11} \times 1.003 \times 10^{31} \, \text{N} \]\\ \[ F \approx 6.714 \times 10^{20} \, \text{N} \][/tex]
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
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 cup of hot water cannot melt a large block of ice. However, the same block melts when dropped into a lake. This is because
6. What is the acceleration of an object that accelerated steadily from rest, traveling 10 m in 10 s?
Answer:
0.2 m/s²
Explanation:
Given:
x₀ = 0 m
x = 10 m
v₀ = 0 m/s
t = 10 s
Find: a
x = x₀ + v₀ t + ½ at²
10 m = 0 m + (0 m/s) (10 s) + ½ a (10 s)²
a = 0.2 m/s²
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!
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.
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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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 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
scientific notation for 7890
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:
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
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:
Ann is driving down a street at 64 km/h.
Suddenly a child runs into the street.
If it takes Ann 0.761 s to react and apply
the brakes, how far will she have moved before
she begins to slow down?
Answer in units of m.
Answer:
13.5 m
Explanation:
First, convert km/h to m/s:
64 km/h × (1000 m / km) × (1 h / 3600 s) = 17.8 m/s
Distance = rate × time
d = 17.8 m/s × 0.761 s
d = 13.5 m
Answer:
13.5 m
Explanation:
64 km * 1000 m/km
-----------------------
1 hr * 3600 s/hr
= 17.8 m/s
d = vt
= (17.8 m/s)(0.761 s)
= 13.5 m
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
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]
Which type of force will an object move towards?
A) weakest
B) strongest
C) net
D) balanced
Answer:
i think it's weakest
EDIT: It's net. I answered weakest but it was wrong and the correct answer was net. oops
Explanation:
if a strong force is acting on something it will push it away, meaning the object would go towards the weaker force
An object will move towards the strongest force acting on it. Option B is correct.
In physics, the net force on an object determines its motion. The net force is the vector sum of all the individual forces acting on the object. When there is a stronger force in a particular direction compared to the other forces, the object will accelerate in that direction.
Newton's second law of motion states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. Mathematically, this can be expressed as
F=ma, where
F is the net force,
m is the mass of the object, and
a is the acceleration.
When multiple forces act on an object, they can either be in the same direction, adding up to create a stronger net force and causing acceleration, or they can be in opposite directions, balancing each other out and resulting in no net force and no acceleration (balanced forces).
In summary, an object will move towards the direction of the strongest force acting on it because that force will result in the greatest acceleration, according to Newton's second law of motion.
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Give one advantage and one disadvantage of physical models
Answer:
Advantage of physical model :
Easily understandable. Finding circumstances and end results utilizing model discernibly. Improving framework understanding through a visual examination. Finding mistakes prior and lessening framework surrenders.Disadvantage of physical model :
Time consuming to make. It takes more time to make any physical model. We should be revamped whenever decimated.