Final answer:
In the biology experiment, the hypothesis predicted that older compost leads to taller bean plants, the independent variable was the age of the compost, the dependent variable was the plant height, and the control was the group with no compost.
Explanation:
Identifying Variables and Structure in a Biology Experiment
In the described biology class experiment, the hypothesis is that older grass compost will produce taller bean plants due to the necessary decomposition for the release of nutrients. The independent variable is the age of the grass compost (3 month-old, 6 month-old, and no compost). The dependent variable is the height of the bean plants measured at the end of the experiment. Constants in the experiment include the amount of sunlight and water received by the plants daily, ensuring other factors do not influence the plant growth. The control in this experiment is flat C, which received no compost. The experiment had three groups (flat A with 3 month-old compost, flat B with 6 month-old compost, and flat C with no compost), and each group consisted of 25 bean plants, which implies that there were 25 trials per group.
To address the question directly, we can summarize:
Hypothesis: Older compost produces taller bean plants.Independent Variable: Age of the grass compost.Dependent Variable: Height of bean plants.Constant: Amount of sunlight and water each day.Control: Flat with 0 g of compost.Number of groups: 3.Number of trials per group: 25.Which unit is used to measure mass? A. gram B. pound C. newton D. milliliter
The thermal energy in a heat engine is used to move a piston. Which best describes why this is possible?
Answer:
the answer is a
Explanation:
just took the test
What are groups of 1, 2, and 3 examples of on the periodic table?
A. Metals
B. Nonmetals
C. Metalloids
D. Noble gases
The elements in groups 1, 2, and 3 on the Periodic Table are mainly metals, with group 1 elements known as Alkali Metals, group 2 elements known as Alkaline Earth Metals, and group 3 elements are a part of the Transition Metals.
Explanation:The groups of 1, 2, and 3 on the Periodic Table refer to the vertical columns and represent different elements with similar properties due to their electron arrangement. Group 1 elements, excluding Hydrogen, are known as Alkali Metals, which are very reactive metals. Group 2 elements are known as Alkaline Earth Metals, also metals but less reactive than Alkali metals. Group 3 elements form a part of the transition metals, who possess properties of both metals and nonmetals. Thus, your correct answer would be A. Metals.
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What two types of scientific knowledge can be expressed as mathematical equations? (Please don't tell me the answer could you please just follow me there. Thank you!)
Which of these is an example of a chemical change ?
Combustion reactions, so as a lighted candle, is an illustration of the chemical change by the mixture of wax and oxygen in a reaction that generates heat, brightness, and carbon dioxide. Decomposition, the reverse of combination, transpires when a particular item splits down into two or more separate items.
In this case, the ice is breaking down into water by the heat generated by the skin.
A car has a mass of 1,000 kilograms. The weight of the car is blank newtons. Use g = 9.8 N/kg for gravity.
Answer:
I hope this helps
Explanation:
A collision cart runs off the edge of a lab table that is .95 meters high. How fast did the collision cart leave the tabletop if the cart lands .40 meters from the base of the table?
From the given values we can generate the equations:
x = vx*t
y = 0.95 - 1/2*g*t^2
where x refers to displacement in horizontal direction, y refers
to displacement in vertical direction, and t is time, while vx is velocity of
the cart in the x direction, and g is the acceleration due to gravity = 9.8 m/s^2
At it's landing point we have x = 0.4, y = 0:
0.4 = vx*t
0 = 0.95 - 1/2*9.8*t^2
Therefore combining the equations and
solving:
t = 0.44 s s
vx = 0.91 m/s
A bug walking on the circular rim of a flower pot completes one lap around the planter in 8.804s. If the radius of the planter is 13.4 cm, how fast was it traveling?
The formula to solve speed is:
Speed = Distance ÷ Time
= Circumference of pot (centimeters) ÷ 8.804 seconds
= 2πr ÷ 8.804 cm/s
= 2(3.14) (13.4) ÷ 8.804 cm/s
= 84.152 ÷ 8.804 cm/s
= 9.5583 or 9.56 cm/s (3 significant digits)
= 0.0956 m/s
The velocity of an object can be represented by a (n)__________ .
The length of the arrow indicates the ____________ . The arrow points
in the direction of the object’s _________.
The velocity of an object can be represented by an arrow. The length of the arrow indicates the speed of the object . The arrow points in the direction of the object’s movement.
What is velocity ?Velocity is a physical quantity that measures the distance travelled per unit time. Velocity is a vector quantity. Thus it is characterized by a magnitude and direction.
The magnitude of the velocity of an object is called speed. Thus velocity is the rate of speed. The change in speed or direction or in both causes a change in velocity.
The velocity of an object generally represented by an arrow in physics. The length of the arrow indicates the speed of the object . The arrow points in the direction of the object’s movement.
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what is the similarities between rigel star and sirius star? explain the similarities..
Rigel and Sirius stars share similarities in their luminosity and high energy emission compared to the Sun, with both stars being more massive and hotter. They are significant in the night sky; Sirius as the brightest star, and Rigel as the brightest in the Orion constellation.
The similarities between Rigel and Sirius stars are notable in terms of their roles as bright stars in the night sky, but they also share characteristics in the way they emit light and energy. Both Rigel and Sirius are significantly more luminous than our Sun. Sirius, well-known as the brightest star in our night sky, emits 23 times more energy than the Sun. Rigel, on the other hand, is the brightest star in the Orion constellation. Both are high-mass stars, with Sirius being more massive in its binary system compared to its companion, Sirius B.
When viewing Rigel through a telescope, we are seeing light that left the star around 800 light years ago, so in a sense, we are looking back in time. By studying starlight with a spectrometer, astronomers can determine various properties of stars, such as their composition, temperature, and velocity. For these two stars, the study of their light reveals that Sirius has an extremely high temperature, similar to Rigel, which emits in the blue spectrum, indicating a high surface temperature as well.
Though they differ in color, with Rigel being blue and Sirius slightly whiter due to temperature variances, both showcase the diverse and dynamic characteristics of stars in our universe.
Which light interaction explains why you can see things that don’t produce their own light.
In Denver, children bring their old jack-o-lanterns to the top of a tower and compete for accuracy in hitting a target on the ground. Suppose that the tower height is h = 7.40 m, and that the bulls-eye is a horizontal distance of d = 3.2 m from the launch point. If the pumpkin is thrown horizontally, what is the launch speed needed to hit the bulls-eye? (Neglect air resistance.)
The launch speed needed to hit the bulls-eye is determined as 2.6 m/s.
How to calculate the launch speed?
The launch speed needed to hit the bulls-eye is calculated by applying the following kinematic equation as shown below.
the time of motion of the pumpkin is calculated as follows;
t = √ (2h / g)
where;
h is the height of fallg is acceleration due to gravityt = √ ( 2 x 7.4 / 9.8)
t = 1.23 s
The launch speed needed to hit the bulls-eye is calculated as;
v = d/t
where;
d is the horizontal distancet is the time of motionv = 3.2 m / 1.23 s
v = 2.6 m/s
When planning your oral presenation, which of the following is an ideal location for presenting your presentation?
Question 4 options:
in front of family or friends
at a science fair
in front of your classmates
at an all-school assembly
what is the correct description of lactic acid fermentation?
is an airplane circling in preparation for a landing potential energy or kinetic energy ?
Making model involves creating representations of complex objects or processes to help people study and understand things that be observed directly
True
False
Measuring the size of a specific object might include which pair of SI units? A. gram, second B. candela, mole C. kilogram, ampere D. meter, kilometer
Which statement describes the relationship between gravitational force and strong nuclear force? (2 points) Select one: a. Strong nuclear force is the stronger force; it is related to weight. b. Gravity is the weaker force; it is related to mass. c. Strong nuclear force is the weaker force; it is related to size. d. Gravity is the stronger force; it is not related to weight.
Answer:
b. Gravity is the weaker force; it is related to mass.
Explanation:
Gravity is the force of gravitational attraction of earth on all objects near its surface
This force on all objects depends on the mass of the objects
This force is given by
[tex]F = \frac{GMm}{r^2}[/tex]
[tex]F = mg[/tex]
so here it is a weak force as it depends on mass and acceleration due to gravity while strong nuclear force is independent of mass and it only depends on the distance between the nuclei.
So as we will change the distance between the nuclei the force between them will change
So here correct answer is
b. Gravity is the weaker force; it is related to mass.
Answer:
b
Explanation:
Which of the following properties refers to the colored powder resulting from rubbing a mineral against a harder surface?
f Hardness
g Luster
h Streak
j Cleavage
Answer:
Streak is the correct answer.
Explanation:
In mineralogy, streak refers to color of the powder that results from dragging a mineral across a harder surface. The line usually has a more consistent color than the one from the mineral itself; this characteristic is very important to identify the mineral.
Science use SI because it allows them to compare data and communication with each
True
False
glass shattering in to pieces bubblegum being stretched a piece of metal expanding due to heat These are all examples of Question 13 options: phase change. temperature change. chemical change. physical change.
The physical change since the things are only undergoing a change in their outward appearance operation (A) phase change is correct.
What is a state of matter?The idea of matter's condition is surprisingly straightforward. It turns out that any substance, regardless of its composition, may exist as a solid, a liquid, or a gas. These are groups of objects with certain observable characteristics.
Particles in gases travel swiftly because they have high energy. Compared to the molecules of solids and liquids, the energy of gas molecules is the largest.
The physical change since the things are only undergoing a change in their outward appearance and not their composition.
Thus, the physical change since the things are only undergoing a change in their outward appearance operation (A) phase change is correct.
The question is incomplete.
The complete question is:
Glass shattering into pieces bubblegum being stretched a piece of metal expanding due to heat
These are all examples of
A) phase change.
B) chemical change.
C) physical change.
D) temperature change.
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A car drives at 30km/h around a roundabout. I still the car accelerating?
Instead of clear-cutting land and moving on, a local lumber business decides to start farming trees: cutting some of the trees and planting the fields they have just cut with saplings.
Compared to the old method of clear-cutting, the impact this new strategy will have on the environment is best described as what?
A) Positive, since the lumber company will immediately make more money.
B) Negative, since it is destroying much of the environment.
C) Positive, since it is a sustainable plan to use a renewable resource.
D) Negative, since it is a sustainable plan to use a renewable resource.
The correct answer is - C) Positive, since it is a sustainable plan to use a renewable resource.
The local lumber business, with this move, is doing good both, to the business itself, and to the environment. Since the amount of trees that will be cut, is immediately replaced with saplings that are taken care of, the lumber business is creating a sustainable business for the future, and also it is creating a renewable resource. The environment will also benefit from this, because the lumber business will only use certain amount of wooded area because it will have new wood constantly on the same area it is using, thus they will not have the need to spread out on a larger area and destroy the environment.
Can someone help me?
Elaborate on the changes in molecular motion of particles as they change from solid to liquid to gas
Answer:
Explained
Explanation:
When a solid matter changes into a liquid state, the inter molecular forces between the molecules reduces and molecules are more free to move around. hence, we can say that the molecules have freedom when a solid state of an element changes into liquid state. The molecules are less tightely packed in liquid then in solids.
How can you use your personal choices to exercise more safely
Personal choices can influence safety in exercise by choosing suitable activities, investing in proper gear, following safety protocols, and utilizing resources like ChooseMyPlate.gov to better analyze and plan diet and physical activity.
Explanation:In order to exercise more safely, personal choices play a crucial role. Firstly, you should consider the aspect of cardiovascular fitness. This involves determining the right form and level of exercise that works for you, considering factors like age and overall health. Engaging in activities that promote cardiovascular health such as brisk walking, swimming, or even biking can significantly improve your quality of life.
Risks associated with exercise such as injuries can be mitigated by investing in proper gear, following recommended safety procedures, and selecting safer routes when biking, for example. If biking doesn't suit you due to cost or storage issues, there are many other activities that can fit personal preferences and situations.
One of the valuable resources that can guide you in making these personalized choices is ChooseMyPlate.gov, which provides extensive information towards a healthy diet and lifestyle. It also includes a tool called SuperTracker that helps you analyze your diet and physical activity.
In conclusion, appropriate personal choices, based on available information, can increase the safety and efficacy of your exercise routine.
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The mass of the container holding this table salt is 3G what is the mass of this table salt
How do you get 6? Can you please explain the steps?
What is the MOST LIKELY effect of deforestation that results from urbanization of an area?
A) Trees will be replaced quickly but by different tree species.
B) There will be less land available for agriculture.
C) There will be an increase in biodiversity.
D) Soil erosion will increase.
Clear-cut logging is a method of cutting down all the trees in a particular area. This type of logging is MOST LIKELY going to effect which earth process?
A) erosion
B) climate
C) weathering
D) mountain building
A. Erosion is the answer
Answer: 1.D) Soil erosion will increase.
Explanation: Deforestation is the phenomena of removal of trees and clear cutting of the forest region so as to obtain the land for urban infrastructure, wood for furniture and for other needs. The deforestation will likely to increase and cause soil erosion due to urbanization. As, trees bind the soil with their roots which prevent the loss of soil due to erosion.
2. A) erosion
Explanation:
A clear cut logging can be define as the removal of the forested land where most of the trees are logged off. The removal of the trees from the roots will directly cause the erosion of the soil due to physical agents such as water and wind. This will deteriorate the quality of soil.
In scientific notation, (6.2x10^4)x(3.3x10^2) equals_____? answer should be written 1.0x10^2 exmple
Under which set of circumstances will the pressure of a gas DEFINITELY increase? A) Increasing the moles and increasing the volume of the gas. B) Raising the temperature and reducing the volume of the gas. C) Lowering the temperature and reducing the volume of the gas. D) Raising the temperature and increasing the volume of the gas.
Answer: Option (B) is the correct answer.
Explanation:
According to the ideal gas equation, pressure times volume equals n times R times temperature.
Mathematically, PV = nRT
where P = pressure
V = volume
n = number of moles
R = gas constant
T = temperature
Therefore, we can see that pressure is directly proportional to temperature and inversely proportional to volume.
Thus, we can conclude that by raising the temperature and reducing the volume of the gas, the pressure of a gas DEFINITELY increase.