Final answer:
The runner covers a total distance of 1.445 meters during the acceleration phase and maintains a constant speed afterward.
Explanation:
To find the distance covered by the runner during the acceleration phase, we can use the equation: d = (1/2) * a * t^2. Substituting the values, we have: d = (0.5) * 1.7 * 1.7 = 1.445 m. Therefore, the runner covers 1.445 meters during the acceleration. To find the total distance covered, we add the distance covered during acceleration to the distance covered at constant speed. Given that distance = speed * time, the total distance covered will be 1.445 m + 7.5 m/s * (1.7 s - 1.7 s) = 1.445 m. Hence, the total distance covered by the runner during this time is 1.445 meters.
At 20.00° C, the density of copper is 8.900 g/cm³. If a section of copper pipe displaces 285.0 milliliters of water when dropped in a displacement tank, what is the mass of the pipe?
A. 0.0310 g
B. 32.00 g
C. 320.0 g
D. 2537 g
Final answer:
To find the mass of a copper pipe that displaces 285.0 mL of water, you multiply the water's volume (which equals the pipe's volume) by the density of copper. The calculation yields 2536.5 g, which is rounded to 2537 g, corresponding to answer choice D.
Explanation:
To find the mass of a section of copper pipe that displaces 285.0 milliliters of water when dropped in a displacement tank, you can use the given density of copper at 20.00° C, which is 8.900 g/cm³. Since the volume of water displaced by the copper pipe equals the volume of the pipe itself, the volume of the copper can be written as 285.0 mL (which is equivalent to 285.0 cm³ since 1 mL = 1 cm³).
The mass of the copper pipe is calculated using the formula:
mass = density × volume
Mass of copper pipe = 8.900 g/cm³ × 285.0 cm³
Mass of copper pipe = 2536.5 g
Rounding to three significant figures, the mass of the copper pipe is 2537 g. Therefore, the correct answer is D. 2537 g.
4. Susan observed that different kinds and amounts of fossils were present in a cliff behind her house. She wondered why changes in fossil content occurred from the top to the bottom of the bank. She marked the bank at five positions: 5, 10, 15, 20 and 25 m from the surface. She removed 1 bucket of soil from each of the positions and determined the kind and number of fossils in each sample.
Hypothesis:
Independent Variable:
Dependent Variable:
Constant (at least one):
Control:
Number of groups:
Number of trials per group:
Answer:
A scientific experiment is divided into two sample groups: control and the experimental. The control group lacks the key variable to be studied while the experimental group contains the sample to be studied.
The experiment contains three experiments: the variable to be studied (dependent variable), the variable which can be changed and influence the dependent variable (independent variable) and the variable which do not change in the experiment (constant variable).
In the given experiment,
1. Hypothesis: when the height changes in soil, the content of the fossil in the soil also changes.
2. Independent Variable: the height of the bank from surface
3. Dependent Variable: the number and type of fossil.
4. Constant variable: the amount of soil in the bucket
5. Control: the soil at the surface (0 cm)
6. Number of groups: 5 groups
7. Number of trials per group: should be 3
julia throws a ball vertically upward from the ground with a speed of 5.89m/s. Andrew catches it when it is on its way down at a height of 1.27m from the ground. After how much time does Andrew catch the ball?
Answer:
0.92
Explanation:
The electrons that produce the picture in a
TV set are accelerated by a very large electric
force as they pass through a small region in
the neck of the picture tube. This region is
1.2 cm in length, and the electrons enter with
a speed of 1 × 105 m/s and leave with a speed
of 2.5 × 106 m/s.
What is their acceleration over this 1.2 cm
length?
Answer in units of m/s2
We use the formula:
a = (v^2 - u^2)/2s
a = acceleration = ?
v = final velocity = 2.5x10^6
u = initial Velocity = 1x10^5
s = distance traveled. = 0.012m
To find the acceleration, we need to fill in the variables:
a = ((2.5x10^6)^2 - (1x10^5)^2)/ 2* 0.012 = 260,000,000,000,000 m/s^2
Our acceleration is 2.6 × 10^14 m/s^2
What is the likelihood that black holes exist in our galaxy? Explain your response.
It is virtually certain that supermassive black holes exist in our galaxy, with compelling evidence for a massive black hole at the Milky Way's center. Accretion disks around black holes release the tremendous energy seen in quasars. The Milky Way is unlikely to become as luminous as a quasar in the near future.
Explanation:The likelihood that black holes exist in our galaxy is very high. Ground-based observations and data from the W. M. Keck telescopes have provided compelling evidence of a supermassive black hole at the center of the Milky Way. This black hole has a mass of about 4 million times that of the Sun, crammed into an extremely small volume that could fit within the orbit of Mercury. Considering alternatives to a black hole, such as a cluster of stars, would lead to frequent stellar collisions and eventually form a black hole anyway due to the immense mass in such a confined space.
Regarding the question about the energy emitted from quasars, an accreting black hole can explain this phenomenon. As matter falls into a black hole, it forms a hot accretion disk around it, which emits tremendous amounts of energy before the matter is swallowed by the black hole. Thus, while black holes pull matter in, they can also account for the energetic outpourings seen from quasars.
As for whether the Milky Way could become as luminous as a quasar, it is unlikely in the near future since quasars are thought to be the early active stages of galaxies with supermassive black holes rapidly accreting mass. The Milky Way's central black hole does not currently exhibit such intense activity.
Final answer:
It is highly likely that black holes exist in our galaxy, with strong evidence supporting a supermassive black hole at the center of the Milky Way with a mass of about four million times that of the Sun.
Explanation:
The likelihood that black holes exist in our galaxy is very high. Observations have provided compelling evidence for a massive black hole at the center of the Milky Way. This black hole has a mass approximately four million times that of the Sun and fits within a space smaller than the orbit of Mercury. Such a concentration of mass in a small space could not be accounted for by normal stars or clusters of stars as it would result in continuous collisions and eventually lead to the formation of a black hole. Thus, a supermassive black hole is the most plausible explanation for the observed data, including the orbits of stars near the galactic center and the immense gravitational influence within that region. Additionally, similar evidence is found in the centers of other galaxies, reinforcing the existence of these enormous gravity wells.
determine the mechanical energy of this object: 1-kg ball rolls on the ground at 2 m/s
A. The ball is on the ground, so the mechanical energy is zero
B. 2 J
C. 1 J
D. 4 J
The answer is 2 Joules.
What electrical appliance was invented in 1910
The electrical appliance invented in 1910 that became widely recognized is the electric toaster. This early toaster is credited with being one of the first to commercially use electricity for cooking purposes.
The invention of the electric toaster in 1910 was a result of the technological advancements and understanding of electricity dating back to the works of scientists like Michael Faraday and James Maxwell. In the late 19th century and early 20th century, electricity began to revolutionize households, leading to the creation of many household appliances we recognize today. The electric toaster was one of the pioneering electric appliances that harnessed the power of electricity for a daily household task, making it a significant invention in the history of domestic technology. Electricity used in these early appliances, though efficient, presented challenges with the electrical infrastructure of the time. Household appliances now typically use a standard voltage of 220 - 240 V, but back then, there were different standards, and the voltage distribution for appliances varied greatly, which contributed to the evolution of electric appliances and today's electrical standards.
The theory of global warming states that the average temperature of the earth has been increasing over time.
a.allow the measurement of the earth’s temperatures at the poles.
b.reveal how the earth’s temperature has fluctuated in the past.
c.reveal how the earth’s temperature varies from location to location.
d.allow the measurement of the earth’s temperature with greater precision.
There are many different types of scientific investigations. Which of the following forms requires the identification and control of variables?
Answer:
Laboratory experiments
Explanation:
:)
About 3% of the water on Earth is freshwater. Only about 40% of that freshwater is available for human use. Why is so much freshwater unavailable for human use?
A) It is frozen.
B) It is polluted.
Eliminate
C) It is salt water.
D) It is in aquifers.
How is chemical activity used to separate copper from its ore?
The diameter of the Moon is 3480 km. What is the surface area of the Moon?
Answer:
Surface area of the moon is [tex]S=3.8\times 10^{13}\ m^2[/tex]
Explanation:
It is given that,
Diameter of the moon, d = 3480 km
Radius of the moon, [tex]r=1740\ km=1740\times 10^3\ m[/tex]
Moon is in the form of sphere. The surface area of the moon is given by :
[tex]S=4\pi r^2[/tex]
[tex]S=4\pi \times (1740\times 10^3)^2[/tex]
[tex]S=3.8\times 10^{13}\ m^2[/tex]
So, the surface area of the moon is [tex]3.8\times 10^{13}\ m^2[/tex]. Hence, this is the required solution.
We have that for the Question "The diameter of the Moon is 3480 km. What is the surface area of the Moon?" it can be said that the surface area of the Moon
A=38045943.67km
From the question we are told
The diameter of the Moon is 3480 km. What is the surface area of the Moon?
Generally the equation for the surface area of a Sphere is mathematically
given as
[tex]A=4\pir^2\\\\Therefore\\\\A=4\pir^2\\\\A=4\pi( 3480 /2)^2\\\\[/tex]
A=38045943.67km
Therefore
the surface area of the Moon
A=38045943.67km
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which of the following best describes the velocity of an object?
Option C, "30m/s east," offers the most accurate and complete description of the object's velocity, encompassing both magnitude and direction, essential for understanding the object's motion comprehensively.
The best description of velocity includes both magnitude and direction. Option C, "30m/s east," provides this information. Velocity is a vector quantity, indicating both speed and direction. In this case, the magnitude of the velocity is 30 m/s, and the direction is specified as east. This comprehensive description allows us to understand both how fast the object is moving and in which direction it is moving.
Option A, "30m/s," only provides the magnitude of the velocity, leaving out the crucial directional information. Option B, "30m east," provides direction but lacks clarity regarding the speed; it could imply the object traveled 30 meters east over some unspecified period. Option D, "30m/s^2," represents acceleration, not velocity. It indicates a change in velocity over time, rather than describing the velocity itself.
In summary, option C, "30m/s east," offers the most accurate and complete description of the object's velocity, encompassing both magnitude and direction, essential for understanding the object's motion comprehensively.
The question probable may be:
Which of the following best describes the velocity of an object ?
A.) 30m/s
B.) 30m east
C.) 30m/s east
D.) 30m?s^2
When a psychologist is making a determination regarding whether or not a study is ethical, one should first consider __________ versus the demand or desire for increased knowledge in a particular field of study.
Answer:
c
Explanation:
A bicycle, a motorcycle, a sports car, and a pickup truck are traveling at the same velocity. Which vehicle requires the greatest amount of force to change its velocity?
A.a bicycle
B.a motorcycle
C.a sports car
D.a pick-up truck
Answer:
D.a pick-up truck
Explanation:
Force required to move an object is given by
F = ma
Where,
m = Mass
a = Acceleration
Here, the acceleration is constant as all the velocities are same so the mass varies the force required. From the equation it can be seen that force varies directly with mass i.e., if mass increased the force will also be increase.
Out of the options here the pick up truck has the most mass so the amount of force will be greatest here.
Which is a common unit of density?
A. The g
B. G/ml
C. Cm3
D. G/s
Making model involves creating representations of complex objects or processes to help people study and understand things that be observed directly
True
False
Answer:
True.
Explanation:
Modeling involves the making of representation of anything. The creation of tiny functional volcano is an example of modeling. The representation of anything else on a smaller scale is defined as modeling. Military commanders can use physical and computational modeling to plan an offensive.
Making model is representation of creation complex objects or may be processes. Models help people understand those things that are complex and they can not detect directly.
A neutral atom of an element has the same number of __________ and ________. Question 6 options: Neutrons and electrons Protons and neutrons Protons and electrons Save
A biologist formulates a hypothesis, performs experiments to test his hypothesis, makes careful observations, and keeps accurate records of his findings. In order to complete this process, the biologist should?
Which explains what happens to a warm air mass at an occluded front? A. Cold air trapped between two warm air masses is pushed upward and cut off from the surface. As the air rises, it warms, and the water in the air condenses to form clouds and precipitation. B. Warm air trapped between two cold air masses is pushed upward and cut off from the surface. As the air rises, it cools, and the water in the air condenses to form clouds and precipitation. C. Cold air trapped between two warm air masses is pushed upward and cut off from the surface. As the air rises, it cools, and the water in the air condenses to form clouds and precipitation. D. Warm air trapped between two cold air masses is pushed downward. As the air sinks, it warms, and the water in the air condenses to form clouds and precipitation.
Final answer:
At an occluded front, warm air trapped between two cold air masses is forced upward, leading to cooling and condensation that forms clouds and precipitation. The correct explanation is option B: Warm air trapped between two cold air masses is pushed upward and cut off from the surface. As the air rises, it cools, and the water in the air condenses to form clouds and precipitation.
Explanation:
The correct explanation of what happens to a warm air mass at an occluded front is given by option B: Warm air trapped between two cold air masses is pushed upward and cut off from the surface. As this warm air rises, it cools, and the water vapor within it condenses to form clouds and precipitation. This lifting of the warm air occurs because cold air is denser than warm air, leading to the warm air being forced above the cold air masses.
In an experiment in which the volume of sand is measured by the displacement of water, the sand was slightly wet to begin with. What effect would this have on the volume of air space that was calculated? On the percentage of the volume that was air space?
Wet sand reduces calculated air space volume and lowers the percentage of total volume attributed to air space.
If the sand was slightly wet at the beginning of the experiment, it would have the following effects:
Volume of Air Space: The presence of water in the sand would reduce the amount of air in the sand particles. Therefore, the volume of air space calculated would be underestimated because some of the air spaces are already filled with water.
Percentage of Air Space: Since the volume of air space is underestimated, the percentage of the total volume that is air space would also be **lower** than it actually is.
How is a scientific law alike as a societal law
compared to the density of liquid water, the density of an ice cube is
Answer:
less than the water
Explanation:
Since the volume of ice grows while it develops, it has a lower density than water since water's mass doesn't change during the cooling and freezing process.
What is density of an ice cube?Ice has a density that is around 90% that of water, however this might change since ice can also include air.
Accordingly, only 10% of an ice cube (or iceberg) will be above the surface of the sea, water is more thick than ice.
In comparison to water of the same volume, ice of the same volume or ice that barely reached the line on the cup would have less substance (water).
Therefore, compared to the density of liquid water ice grows while it develops, it has a lower density than water.
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Mary Sue is making caramel ice cream. In the first part of the process, she combines a cup of sugar and a cup of water in a saucepan. She cooks the mixture over medium heat until the sugar melts and browns to a light amber color. Then she adds the same amount of water to the mixture along with a cup and a half of cream and milk. Which part of the preparation indicated a chemical change? A. adding cream and milk to the mixture B. mixing the sugar with water C. melting the sugar D. sugar changes from white to a light amber color
Answer:
The correct answer is D my guy
Explanation:
Match these items.
1. Ca
2. H2O
3. nuclear decay
4. nuclear synthesis
5. η
6. positive charge
7. e
8. number of protons in nucleus
proton
atomic number
element
compound
fission
electron
neutron
fusion
Explanation:
1. Ca → element
Ca is a symbol of calcium element categorize as alkali earth metal.
2. [tex]H_2O[/tex] → compound
Compound is a substance made up of two more than two different elements.
3. Nuclear decay → fission
Fission is defined as process in which heavier unstable nucleus divide itself into two or more smaller stable nuclei with release of large amount of energy.
4. Nuclear synthesis → fusion
Fusion is defined as process in which two or more nuclei combines together to form an larger nucleus with release of large amount energy.
5. η → neutron
One of the subatomic particle of an atom located in the nucleus of an atom with no electrical charge.
6. Positive charge → proton
One of the subatomic particle of an atom located in the nucleus of an atom with positive electrical charge.
7. e → electron
One of the subatomic particle of an atom located inside an atom and outside the nucleus of an atom with negative electrical charge.
8. Number of protons in nucleus → atomic number
Atomic number of an atom is equal to the total number of protons present in the nucleus if the an atom.
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Chemical energy is stored in our food. What form of energy did this chemical energy start out as?
Question 5 options:
light energy from the sun
chemical energy from the plants it came from
kinetic energy from moving from a plate to your mouth
heat energy from being cooked on the stove
Unlike a theory, a scientific law describes an observed pattern without attempting to _____ it. prove explain test verify
Answer:
its explain
Explanation:
Unlike a theory, a scientific law describes an observed pattern in nature without attempting to explain it.
what is the meaning of Choreography for Aerobic Dance?
Choreography in aerobic dance refers to the planned and rehearsed arrangements of dance movements that provide a cardiovascular workout and incorporate artistic elements in sync with music.
Explanation:Choreography refers to the art of creating, arranging, and recording dance movements to convey a specific aesthetic or theme in a dance performance. In the context of aerobic dance, choreography involves designing routines that combine fitness and dance elements to provide an effective cardiovascular workout. Unlike improvised or random dancing, choreography in aerobic dance is planned and rehearsed to ensure that each movement aligns with the music and enhances the overall cardio exercise experienced by participants.
Within aerobic dance, choreography plays a crucial role in ensuring that participants engage in continuous motion, which helps to maintain the aerobic nature of the exercise. This type of exercise is characterized by its reliance on aerobic metabolism, utilizing oxygen to meet energy demands during the workout. Choreography for aerobic dance is often synchronized with upbeat music, which motivates participants and adds enjoyment to the workout.
Effective choreography in aerobic dance also considers the safe execution of movements to avoid injury, making the role of a choreographer essential. The choreographer is the person responsible for not only the artistic vision of the dance but also the practical aspects such as ensuring all movements are achievable by participants at various levels of fitness and skill.
3. After studying about recycling, members of John’s biology class investigated the effects of various recycled products on plant growth. John’s lab group compared the effect of different aged grass compost on bean plants. Because decomposition is necessary for the release of nutrients, the group hypothesized that older grass compost would produce taller bean plants. Three flats of bean plants (25 per flat) were grown for 5 days. The plants were then fertilized as follows: flat A = 450. g of 3 month old compost; flat B = 450. g of 6 month old compost; flat C = 0 g of compost. The plants received the same amount of sunlight and water each day. At the end of 30 days, the group recorded the height of the plants in cm.
Hypothesis:
Independent Variable:
Dependent Variable:
Constant (at least one):
Control:
Number of groups:
Number of trials per group:
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.A 400g sample of water absorbs 500j of energy. how did the water temperature change if the specific heat of water is 4.18j/g©. Show your work. please help me.
In general, the quantity of heat energy, Q, required to raise a mass m kg of a substance with a specific heat capacity of c J/(kg °C), from temperature t1 °C to t2 °C is given by:
Q = mc(t2 – t1) joules
So:
(t2-t1) =Q / mc
As we know:
Q = 500 J
m = 0.4 kg
c = 4180 J/Kg °c
We can take t1 to be 0°c
t2 - 0 = 500 / ( 0.4 * 4180 )
t2 - 0 = 0.30°c