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
A man pushes a lawn mower with a force of 25 newtons. The lawn mower has a mass of 17 kilograms and the handle makes an angle of 60 degrees with the horizontal. How much work is done if the lawn mower is pushed a total of 500 meters
Answer:
6250 J
Explanation:
Work is the distance times the component of the force along that distance.
The horizontal component of the force is:
25 N × cos(60°) = 12.5 N
So the work done is:
W = (500 m) (12.5 N)
W = 6250 J
To calculate the work done by the man on the lawn mower, we use the formula Work = Force imes Distance times cos( heta). The horizontal component of the force is determined and then multiplied by the distance to get a total work done of 6250 joules.
Calculating Work Done When Pushing a Lawn Mower
To calculate the work done on an object, you can use the formula Work (W) = Force (F) times Distance (d) times cos( heta), where heta is the angle between the force and the direction of movement. For the man pushing the lawn mower, the force is 25 newtons, the distance is 500 meters, and the angle is 60 degrees with the horizontal.
First, calculate the horizontal component of the force:
Fhorizontal = F times cos(heta)
Fhorizontal = 25 N times cos(60°)
Fhorizontal = 25 N times 0.5
Fhorizontal = 12.5 N
Next, calculate the work done using the horizontal component of the force:
W = Fhorizontal times d
W = 12.5 N times 500 m
W = 6250 J (joules)
Therefore, the work done by the man on the lawn mower when pushing it 500 meters is 6250 joules.
In order to decrease the friction an object experiences, you can either change
the surface it sits on or you can_______its weight.
Answer:
Reduce its weight
Explanation:
For an object on a flat surface, the maximum force of friction experienced by the object is given by:
[tex]F = \mu W[/tex]
where
[tex]\mu[/tex] is the coefficient of friction
W is the weight of the object
As we can see from the formula, there are two ways of reducing the friction:
- Decreasing [tex]\mu[/tex] --> this coefficient depends on the material and on the roughness of the surface, so this can be changed by changing the properties of the surface
- Decreasing W, the weight --> this can be done by reducing the mass of the object
The velocity of a an object in linear motion changes from +25 meters per second to +15 meters per second in 2.0 seconds.
Answer:
[tex]-5.0 m/s^2[/tex]
Explanation:
Missing question:
What is the object's acceleration?
Solution:
The acceleration of an object is given by
[tex]a=\frac{v-u}{t}[/tex]
where
v is the final velocity
u is the initial velocity
t is the time taken for the change in velocity
For the object in this problem,
u = +25 m/s
v = +15 m/s
t = 2.0 s
Substituting,
[tex]a=\frac{15-25}{2}=-5.0 m/s^2[/tex]
And the acceleration is negative because its direction is opposite to that of the velocity.
Starting at 48th Street, Dylan rides his bike due east on Meridian Road with the wind at his back. He rides for 20 min at 15 mph. He then stops for 5 min, turns around, and rides back to 48th Street; because of the headwind, his speed is only 10 mph.
Answer:
55 min
Explanation:
The missing question is: how long does the trip take?
First of all, we need to find the initial distance covered by Dylan. In the first part, he rides for
[tex]t_1 = 20 min = \frac{1}{3}h[/tex]
at a speed of
v = 15 mph
therefore, the distance he covered is
[tex]d = v t_1 = (15)(\frac{1}{3})=5 mi[/tex]
Then Dylan stopped for a time of
[tex]t_2 = 5 min = \frac{5}{60}=\frac{1}{12}h[/tex]
Finally, on the way back, Dylan covered again this distance but travelling at a new speed of
v = 10 mph
So, the time he took is
[tex]t_3 = \frac{d}{v}=\frac{5}{10}=\frac{1}{2}h = 30 min[/tex]
So, the total time of the trip was
[tex]t=t_1 + t_2 + t_3 = 20 min + 5 min + 30 min = 55 min[/tex]
Dylan's bike ride involves displacement and average velocity. He ends up back at the starting point after riding a certain distance and direction with the wind and then against the wind, resulting in a final displacement of zero miles.
Explanation:This question involves the concept of displacement and average velocity.
Dylan rides his bike east for 20 minutes at a speed of 15 mph. The distance he travels can be calculated by multiplying the speed by the time: (15 mph) x (20 min) = 300 miles. Since he rides in a straight line, his displacement is also 300 miles east.
After turning around and riding back, Dylan travels at a speed of 10 mph. In the opposite direction, his displacement will be the negative value of his initial displacement: -300 miles.
Overall, his final displacement is the sum of his initial displacement and his opposite displacement: 300 miles + (-300 miles) = 0 miles. This means that Dylan ends up back at the starting point, 48th Street.
A particle moves in a straight line. Its speed(v)
increases linearly with time. If the initial speed of
the particle is vo and its speed at t = 4 s is 2V
then integration of vdt from 0 to 4 is
(1) Zvo
(3) 6v
(2) 8vo
(4) AVO
Answer:
[tex]6v_0[/tex]
Explanation:
The speed of the particle increases linearly with time, so we can write it as
[tex]v(t) = kt+v_0[/tex]
where k is the a certain constant of proportionality and [tex]v_0[/tex] is the initial speed.
We also know that at t = 4 s, the speed is [tex]v=2v_0[/tex], so we can use this information to find k:
[tex]v(4) = 4k+v_0 = 2v_0 \rightarrow k = \frac{v_0}{4}[/tex]
So the complete expression of v(t) is
[tex]v(t) = \frac{v_0}{4}t+v_0 = v_0 (\frac{t}{4}+1)[/tex]
Now we integrate the quantity [tex]v(t)[/tex], and we find:
[tex]\int {v(t)} \, dt =\int (\frac{v_0}{4}t+v_0) \, dt =\frac{v_0}{8}t^2 + v_0 t[/tex]
Substituting the limit of integration t = 4, we find:
[tex]\frac{v_0}{8}4^2 + 4v_0 =2v_0+4v_0 = 6v_0[/tex]
And substituting t = 0, we find 0. So, the result of the integration from 0 to 4 is
[tex]6v_0[/tex]
Abi measures the volume and weight of four objects and records his data in this table. A 3-column table with 4 rows titled volume and weight. The first column is labeled object with entries W, X, Y, Z. The second column is labeled volume with entries 10 centimeters cubed, 122 centimeters cubed, 56 centimeters cubed, 18 centimeters cubed. The third column is labeled weight with entries 2 pounds, 3 pounds, 1 pound, 7 pounds. Which object has the most mass? W X Y Z
The concept of weight allows us to find the mass of each body, finding that the answer for the body with the greatest mass is:
material Z with m = 0.125 slug
Density is a connection used in many expressions of physics, it is defined by the relationship between the mass and the volume of the body.
ρ = [tex]\frac{m}{V}[/tex]
Where ρ is the density, m the plus and V the volume of the body
The specific weight is defined by the relationship between the weight of the body and its volume, it is a quantity that depends on the value of the acceleration due to the gravity of the place. Expression used in the English system of measurements
γ = [tex]\frac{W}{V}[/tex]
From the previous expressions it is observed that the density and the specific weight are related
γ = ρ g
The weight of the product of the mass of the body that is invariant by the value of the acceleration of gravity, whose value depends on the place of measurement.
W = m g
m = W / g
Where W is the weight, m the mass and g the acceleration due to gravity
This exercise describes the values in the following table
material volume (cm³) weight (lb)
W 10 2
X 122 3
Y 56 1
Z 18 7
They ask to find which body has the greatest mass.
In the English system, the measurement is the weight of the body, which is expressed in pounds, the mass measurement is not so common and its unit is the slug.
let's calculate
Material W
m = 2/32
m = 0.0625 slug
Material X
m = 3/32
m = 0.09375 slug
Material Y
m = 1/32
m = 0.0312 slug
Material Z
m = 7/32
m = 0.125 slug
In conclusion, using the concept of weight, we can find the mass of each body, finding that the answer for the body with the greatest mass is:
material Z with m = 0.125 slugLearn more about weight here:
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Answer:
D
Explanation:
Edge
describe how you can you use a graduated cylinder to measure the volume of an irregular object
Answer:Place the graduated cylinder on a flat surface and view the height of the liquid in the cylinder with your eyes directly level with the liquid. The liquid will tend to curve downward. This curve is called the meniscus. Always read the measurement at the bottom of the meniscus.
Explanation:
2. The____
is a series of steps that can help you make good decisions
and solve problems.
The 'decision-making process' is a series of steps employed to make well-informed decisions and solve problems efficiently. It encompasses understanding the problem, assembling information, producing options, examining these options, choosing the best one, and implementing and evaluating the outcome.
Explanation:The answer you're likely seeking is the decision-making process. This process is a series of steps that can aid in making informed decisions and solving problems effectively. This process often includes identifying the problem, gathering information, generating ideas or solutions, evaluating potential solutions, choosing the most suitable solution, and then implementing and assessing this chosen solution. This sequence of steps is used in many contexts, from mathematics to business to personal life.
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Marie Curie and her husband Pierre were Henri Becquerel's graduate students when Becquerel
discovered spontaneous radiation. In 1903, the Curies shared the Nobel prize for physics with Becquerel.
Based on The Discovery of Radioactivity, which statement best describes Becquerel's influence on
Marie Curie's work with radioactivity?
O
O
Becquerel proposed the concept of radiation and Marie Curie reproduced his experiments.
Becquerel's work proved that radiation was far too dangerous for anyone to experiment with.
Marie Curie's work with Becquerel made her more curious and prompted her to research and
experiment with radioactivity.
Marie Curie was such a talented scientist that Becquerel's work did not have any influence on her
discoveries.
O
Answer:
It is C on edge.
Explanation:
Because I just figured it out and got it right and because it says so in the link provided from the question.
Answer:
the answers is c
Explanation:
just did it on edge
What is a physical change in matter?
Answer:Physical changes involve states of matter and energy.
Explanation:
No new substance is created during a physical change, although the matter takes a different form. The size, shape, and color of matter may change. Physical changes occur when substances are mixed but don't chemically react.
Final answer:
A physical change is when matter changes its form or properties without changing its chemical identity, such as melting ice or evaporating water.
Explanation:
A physical change is a type of change in which the form of matter is altered but its identity remains the same. For example, when an ice cube melts, it goes from a solid to a liquid (Figure 1.2.3); this change alters its shape and allows it to flow, yet the chemical composition of water (H₂O) does not change. Another instance is when water vaporizes; the temperature and energy of water molecules increase leading to evaporation, turning liquid water into water vapor (H₂O (l) → H₂O (g)), without altering the molecular structure.
Sorting a mixture of pennies and nickels changes the arrangement of the coins without changing their properties. Similarly, tearing a piece of paper changes its shape and size, but it remains paper. These examples show that during a physical change, the arrangement of particles may change, but the mass, number of atoms, and number of molecules stay the same.
In any circuit, current is inversely proportional to:
potential
resistance
emf
voltage
Answer:
This equation, i = v/r, tells us that the current, i, flowing through a circuit is directly proportional to the voltage, v, and inversely proportional to the resistance, r. In other words, if we increase the voltage, then the current will increase.
HOPE THIS HELPED!!!!!!!!!!!!!!XDDDDDD
19. A young woman named Kathy Kool buys a superde-
luxe sports car that can accelerate at the rate of
16 ft/s2. She decides to test the car by dragging with
another speedster, Stan Speedy. Both start from rest,
but experienced Stan leaves 1 s before Kathy. If Stan
moves with a constant acceleration of 12 ft/s2 and
Kathy maintains an acceleration of 16 ft/s2, find
(a) the time it takes Kathy to overtake Stan, (b) the
distance she travels before she catches him, and
(c) the velocities of both cars at the instant she over-
takes him.
Answer:
a) 6.46 seconds
b) 334 feet
c) Kathy: 103 ft/s; Stan: 89.6 ft/s
Explanation:
At constant acceleration:
x = x₀ + v₀ t + ½ at²
where x is final position,
x₀ is initial position,
v₀ is initial velocity,
a is acceleration,
and t is time.
For Kathy, x₀ = 0 ft, v₀ = 0 ft/s, a = 16 ft/s², and t = t.
For Stan, x₀ = 0 ft, v₀ = 0 ft/s, a = 12 ft/s², and t = t + 1.
Kathy:
x = 0 + (0) t + ½ (16) t²
x = 8t²
Stan:
x = 0 + (0) (t + 1) + ½ (12) (t + 1)²
x = 6 (t + 1)²
a) When Kathy overtakes Stan, they have the same position:
8t² = 6 (t + 1)²
8t² = 6 (t² + 2t + 1)
8t² = 6t² + 12t + 6
2t² − 12t − 6 = 0
t² − 6t − 3 = 0
Solving with quadratic formula (or complete the square):
t = [ -(-6) ± √((-6)² − 4(1)(-3)) ] / 2(1)
t = [ 6 ± √(36 + 12) ] / 2
t = (6 ± √48) / 2
t = (6 ± 4√3) / 2
t = 3 ± 2√3
Since t > 0, t = 3 + 2√3 ≈ 6.46 seconds.
b) Kathy's position when she overtakes Stan is:
x = 8t²
x = 8 (3 + 2√3)²
x ≈ 334 feet
c) To find the final velocities, we use:
v = at + v₀
For Kathy:
v = (16) (3 + 2√3) + 0
v ≈ 103 ft/s
For Stan:
v = (12) (3 + 2√3 + 1) + 0
v ≈ 89.6 ft/s
How do you find velocity on a position/time graph?
Well, to find velocity, you need to divide the change in position by the change in time. So on your graph, find two points. Find the change in position and time in those two points, these can be any two points on the graph. Then you can divide the change in position by the change in time. (I know this explanation is confusing so hopefully what I included below can help.)
Velocity = x1 - x2 divided by t1 - t2
x1 = final position x2 = initial position
t1 = final time t2 = initial time
Hopefully this helps!
1. Summarize What are the four conditions of a
purely competitive market?
Answer:
Explanation:
1. Many buyers and sellers participate in the market.
2. Sellers offer identical products.
3. Buyers and sellers are well informed about products.
4. Sellers are able to enter and exit the market freely.
Which of these is an example of a labor law?
A. A limitation on building types in an industrial area.
B. A regulation against production limitation.
C. A requirement that products be truthfully labeled.
D. A restriction on when a union may call a strike.
Answer: D. A restriction on when a union may call a strike.
Explanation:
A labor law is concerned with the establishment of labor relation framework that provides peaceful relations between the employees and the organization. It usually includes the rules for forming a union. In this condition the union of labor or workers become a bargaining agent and conducts strikes and lock-outs to fulfill it's needs and present their grievances to the authorities.
Answer:
The answer is D. A restriction on when a union may call a strike.
Explanation:
What effect does distance have on the force of gravity?
A - Increasing the distance between two objects increases the gravitational force.
B - Decreasing the distance between two objects decreases the gravitational force.
C - Increasing the distance between two objects decreases the gravitational force.
D - Distance is not a factor in determining the force of gravity.
Answer:
The answer is increasing the distance between two objects decreases the gravitational force. which is C
The effect does distance have on the force of gravity is increasing the distance between two objects decreases the gravitational force. Therefore, option C is correct.
What is gravitational force ?The gravitational force, which is what pushes mass-containing objects toward one another. We frequently consider the pull of gravity from the Earth. Your body is kept on the ground by this force. However, all mass-bearing objects are pulled toward one another by gravity.
Any two mass-containing objects are attracted to one another by the gravitational force. Because it consistently attempts to pull masses together rather than pushing them apart, the gravitational force is known as attractive.
According to legend, Isaac Newton developed the theory of gravitation around 1665 or 1666 after observing an apple fall and wondering why it fell straight down rather than sideways or even upward.
Thus, option C is correct.
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If one object is 103 km away and a second object is 106 km away, one could say that the second object is _____ times further away than the first object.
The second object at 106 km is approximately 1.03 times further than the first object at 103 km. For proper comparison, both distances should be in the same unit, after which simple arithmetic can reveal the relation between the two.
Explanation:When comparing distances, it's essential to express both measurements in the same unit to clearly understand which is greater or by how much one is greater than the other. For example, if one object is 103 km away and a second object is 106 km away, we are actually comparing two distances that are already in the same unit, kilometers. In this case, 106 km is merely 3 km farther than 103 km; it is not a multiple times further. To establish a ratio of the greater distance to the lesser one, we can divide 106 by 103, which gives us approximately 1.0291262, meaning the second object is approximately 1.03 times further away than the first object, not a whole multiple times further.
For a better understanding, let's consider the examples given:
For the distances of 743 km and 74.3 km, once both are expressed in the same unit, it's clear that 743 kilometers is greater than 74.3 kilometers, illustrating how to compare two different distances.When comparing 2 km and 400 meters, converting the 400 meters to kilometers (0.4 km) shows that 2 kilometers is greater than 0.4 kilometers.For comparing a running race of 5000 meters with another race of 10 kilometers, once you convert 5000 meters to 5 kilometers, it is evident that 10 kilometers is greater than 5 kilometers.
Therefore, it's important to compare distances thoughtfully, ensuring they are expressed in the same units to accurately determine the comparison.
A loaf of bread weighs 1362 g. The weight in kilograms is
a. 001362 kg.
c. 01362 kg.
b. 1362 kg.
d. 1.362 kg.
A loaf of bread weighs 1362 g. The weight in kilograms is 1.362 kg. The correct option is d.
The weight of a loaf of bread is 1362 grammes, or 1.362 kilogrammes. Since there are 1000 grammes in a kilogramme, you must divide the weight in grammes by 1000 to convert it to kilogrammes. So, 1.362 kg is the weight in kilogrammes.
The conversion choice "d. 1.362 kg" gives the right weight of the bread in kilogrammes, appropriately representing this conversion.
Thus, the correct option is d.
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The graph is the path Beth took on a walk.
A graph with horizontal axis time (seconds) and vertical axis position in (meters). The line runs in 2 straight segments from 0 seconds 2 meters to 6 seconds 8 meters to 10 seconds 0 meters.
What does the line from time 6 to 10 indicate?
Beth slowed down considerably.
Beth went back toward her origin.
Beth sped up considerably.
Beth went farther away from origin.h expression is equivalent to
Answer:
Beth went back toward her origin
Explanation:
Please, see the attached image that represent's Beth's path.
She started her walk 2 meters from the origin (0) and after 6 seconds she headed back to position zero (0) the origin. Notice the second half of the graph as a segment going down, thus reducing her distance from the origin, and getting closer to it.
Answer:
Beth went back toward her origin.
Beth speed up considerably.
Explanation:
speed of the object is defined as the slope of the position time graph
here we know that
initially it moves from t = 0 to t = 6 from x = 2 to x = 8
so the slope is given as
[tex]v = \frac{x_2 - x_1}{t_2 - t_1}[/tex]
[tex]v = \frac{8 - 2}{6 - 0}[/tex]
[tex]v = 1 m/s[/tex]
similarly for next we have
again it comes to x = 0 after t = 10 s
so the speed is
[tex]v_2 = \frac{x_3 - x_2}{t_3 - t_2}[/tex]
[tex]v_2 = \frac{0 - 8}{10 - 6}[/tex]
[tex]v_2 = -2 m/s[/tex]
so here the velocity is negative which shows that it will move in reverse direction also its velocity is also increase
so correct answers are
Beth went back toward her origin.
Beth speed up considerably.
What is sound advice for people becoming better listeners?
People should show appreciation for what the speaker is saying.
People should pay attention to what the person is actually saying, not to what his or her actions and voice are implying.
People should offer advice only when it is actionable and applicable.
People should use their own words when restating the speaker’s message for understanding.
Answer:
People should show appreciation for what the speaker is saying.
Explanation:
List and Explain three ways study groups benefit your learning
Answer:
Explanation:
Find a new perspective.The other members of the study group will have different ideas and perspectives to their own, thus generating different ways of understanding a topic. When you study, you only have one vision, however, by doing it in company, your own knowledge is enriched and you can understand the concepts globally.
MotivationIt is another advantage of studying in a group. Being alone, he turns around before sitting down to study, looking for excuses and wasting time. On the other hand, when having a study appointment, you must meet a schedule, taking advantage of the moment to just study. They will also encourage each other to continue studying. In short, you cannot postpone studies as you would if you were studying alone.
Eliminate boredom.Joining a study group generally makes the act of studying a little less monotonous. You should try to put together a group with those who understand the subject and are responsible, and the ideal is to enjoy the entire study process in company.
Answer:
Look at things from a different angle.
Other members of the study group will have different views and viewpoints than they do, resulting in a variety of approaches to a topic. When you study, you only have one vision; but, when you do it in a group, your knowledge expands and you may grasp topics more broadly.
Motivation
Another benefit of studying in a group is this. He turns around before settling down to study because he is alone, looking for reasons and wasting time. When you have a study appointment, on the other hand, you must stick to a timetable and use the time to study. They will also motivate one another to keep learning. In other words, you won't be able to postpone your studies like you would if you were studying alone.
Explanation:
Please help!
How did Jessica Kusher create her new material?
Jessica Kusher created a new material by b. mixing graphite, gypsum, and mica that could be painted on roof shingles.
This innovative formula aims to address two significant issues: reducing a home's cooling costs and potentially lowering ozone pollution in urban areas.
The material is notable for its environmentally friendly impact, focusing on making buildings more energy-efficient by reflecting more sunlight and thus reducing the amount of heat absorbed by the roofs.
This reduction in heat absorption could lead to a decrease in the energy required to cool buildings. The creation of this new material involved experimenting with different components to enhance its efficiency and effectiveness.
Full question:
How did Jessica Kusher create her new material?
a. harvesting rare minerals from deep-sea vents and combining them with organic polymers.
b. mixing graphite, gypsum, and mica that could be painted on roof shingles.
c. genetically engineering bacteria to produce a biodegradable substitute for plastic.
d. extracting nanoparticles from recycled plastic bottles and incorporating them into a concrete mixture for enhanced durability.
Distinction between eutrophication and artificial eutrophication
Difference between Eutrophication and Artificial Eutrophication
Eutrophication is defined as the process where there is excessive nutrients available in a water medium. There are two types of eutrophication process called as man-made eutrophication or artificial eutrophication and natural eutrophication.
As the name implies natural eutrophication occurs naturally without any external factor. Whereas artifical eutrophication is stimulated by external factor as it is forced by human activity. Eutrophication is imposed artificially so that to maintain a proper state of equilibrium is to reduce water pollution.
Eutrophication refers to the natural process of nutrient enrichment in bodies of water, while artificial eutrophication is the accelerated process caused by human activities.
1) Cause: Eutrophication occurs naturally from sources like sediment erosion and decaying organic matter. Artificial eutrophication is caused by human activities such as agriculture, sewage, and industrial discharges.
2) Rate and Timescale: Eutrophication is a slow, natural process occurring over centuries or longer. Artificial eutrophication is rapid and occurs within a shorter time frame.
3) Nutrient Sources: Eutrophication is driven by natural sources like weathering of rocks and soils. Artificial eutrophication is primarily caused by human sources such as agricultural runoff and sewage discharge.
4) Ecological Impact: Eutrophication can have ecological impacts, but artificial eutrophication often leads to more severe consequences like harmful algal blooms, oxygen depletion, and disruption of aquatic ecosystems.
5) Control and Prevention: Eutrophication is challenging to control as a natural process. Artificial eutrophication can be mitigated by implementing nutrient management practices, wastewater treatment, and land-use regulations.
In summary, eutrophication is the natural process of nutrient enrichment, while artificial eutrophication is the accelerated process caused by human activities, leading to more severe ecological impacts.
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think about Newton's second law. when designing a rocket ship, what could be adjusted in the design to provide more acceleration?
Answer:Newton's second law is not sufficient to explain rocket's design or requirements it also involves momentum
Explanation:by solving some equations involving newton's second law and momentum we get this Ma=mv M is mass of rocket and m is mass of gases so a=mv/M so as the time passes mass of rocket decreases due to burning of fuel and acceleration a increases
A heavier rocket requires more force to accelerate. Newton's second law, sometimes written as a=F/m, states that the heavier an object, the more force is required to accelerate it.
What is Newton's second law?It implies that the time rate of change of a momentum is equal in magnitude and direction to the force applied to it. A body's momentum is equal to the product of its mass and velocity.
The amount of force produced by a rocket engine is determined by the amount of rocket fuel burned and the rate at which gas escapes the rocket (second law).
The reaction, or motion, of the rocket is equal to and in the opposite direction of the engine's action, or force (third law).
To accelerate, a heavier rocket requires more force. Newton's second law, sometimes written as a=F/m, states that the more force required to accelerate an object, the heavier it is.
Thus, this way, it could be adjusted in the design to provide more acceleration as a greater force will result in a greater acceleration, so a greater force will accelerate a rocket more.
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Which statement best explains why elements are matter?
A) The building blocks of elements are small particles called atoms.
B) Elements are pure substances that cannot be divided chemically.
C) Each element is a pure substance composed of one type of atom.
D) An element is a physical substance that has mass and takes up space.
An observation is received directly or indirectly by
Hearing
Seeing
Tasting/touch
All of the above
Answer:
All of the above
Explanation:
because these are all senses of the body and therefore you're receiving signals from all of them all the time
Answer:
D. All of the above.
Explanation:
An observation is received directly or indirectly by all of the above. When observing things, you need to visually be able to see what is being observed, and be able to touch hear and even taste. This ensures that you can get the best out of the observation.
True or false a mixture of soil has the same chemical composition throughout ?
Answer:
false
Explanation:
A mixture of soil does not have the same chemical composition through out.
at some point we begins to see different chemical composition
A car travels 12 kilometers due north and then
8 kilometers due west going from town A to
town B. What is the magnitude of the displacement
of a helicopter that
ies in a straight line from
town A to town B?
Answer:
14.42km
Explanation:
Given that the car traveled 12km due north, then 8 km due west going from town A to B, this can be represented on x-y plane as ( vectors) 12 units up and the 8 units to the left .
In doing so , the magnitude of displacement will be the square-root of the sum of squares of the two vectors
Magnitude =[tex]\sqrt{12^2+8^2} \\\\=\sqrt{144+64} \\\\\\=\sqrt{208} \\\\\\=14.42km[/tex]
If a car travels 12 kilometers due north and then 8 kilometers due west going from town A to town B. The magnitude of the displacement of a helicopter that flies in a straight line from town A to town B will be 14 km
Using this formula
Magnitude of the displacement=√North kilometers ²+West kilometers ²
Where:
North=12 kilometers
West=8 kilometers
Let plug in the formula
Magnitude of the displacement=√12²+8²
Magnitude of the displacement=√144+64
Magnitude of the displacement=√208
Magnitude of the displacement=14 km
Inconclusion If a car travels 12 kilometers due north and then 8 kilometers due west going from town A to town B. The magnitude of the displacement of a helicopter that flies in a straight line from town A to town B will be 14km
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Jose gets up from his seat on the bus to move closer to the front. Just as he begins to walk forward, the bus stops at a light. What is the best explanation of what happens to Jose?
Answer:
According to first law of motion, a body continues to be in state of rest or motion unless an unbalanced force acts on it.
When the bus stops, Jose feels a sudden forward motion. This is due to the inertia of motion. In the bus, Jose has same speed as the bus while sitting. When she gets and starts moving, the bus stops at the light. But due to the inertia of motion, Jose feels a sudden forward motion before she finally stops.
An experiment is conducted using 2 plants to determine if the amount of sunlight they receive affects how fast they grow. Which should be true about this experiment, based on good experimental design? An experiment is conducted using 2 plants to determine if the amount of sunlight they receive affects how fast they grow. Which should be true about this experiment, based on good experimental design?
Each of the plants should be planted with different types of soil.
Both plants should receive the same amount of sunlight each day.
Each of the plants should be planted with different types of fertilizer.
1 plant should receive sunlight each day, and 1 plant should never receive sunlight.
Greetings!
The correct answer choice is Choice 4.
Why?
In a scientific experiment the only thing being changed is the independent variable. Everything else should stay the same.
In this experiment, the independent variable is the amount of sunlight each plant should receive. Here's a tip- when looking for and independent variable look for whats being changed on purpose.
Hope this helps!
~Fluerie