Curiousity. - A scientist shows interest and pays particular attentions to objects or events.
Honesty. - A scientist gives a truthful report of observations.
Open-Mindedness. - A scientist listens to and respects the ideas of others
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
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.
A(n) _____ is a mass of living protoplasm.
amoeba
paramecium
euglena
virus
Answer: The correct answer for the blank is-
amoeba.
Protoplasm is considered as the living part of cell, which includes cell membrane, cytoplasm, and the nucleus.
Amoeba ( it is a protozoan, which is a group of kingdom protista) is the simplest living form of unicellular eukaryotic organisms. It does not have any specified shape. All the cellular activities that are essential for its life, takes place in the protoplasm. As all the properties of protoplasm can be readily observed in this simple organic form ( Amoeba), therefore, it is considered as the mass of living protoplasm.
There are many different types of scientific investigations. Which of the following forms requires the identification and control of variables?
Answer:
Laboratory experiments
Explanation:
:)
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.
HELP ASAP!!
Which of the following actions will decrease the gravitational force between two objects?
Increasing the mass of the objects
Increasing the density of the objects
Increasing the distance between the objects
Increasing the temperature of the objects
the answer would be c
Increasing the distance between the objects will decrease the gravitational force between two objects. So, the correct option is C.
What is Gravitational force?According to Newton's universal law of gravitation, the force of attraction between any two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
It is defined as the fundamental interaction which causes mutual attraction between all things that have mass or energy. It is represented as :
[tex]F = G * [M_1M_2]/r^2[/tex]
Where, f(r) is a variable denoting a Conservative Force, The f(r) here is the inverse law force because it varies inversely as a square of ‘r’. In the above equation, ‘G’ is the Gravitational Constant. According to this formula, when distance increases then the gravitational force decreases.
Therefore, the correct option is C.
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How is sound detected by the brain? A.electromagnetic waves
B. Bones amplifying sound
C. Vibrations
D. Electrical impulses from the ear
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:
you push a sled of mass 15 kg across the snow with a force of 180 N for a distance of 2.5 m. There is no friction. if the sled started at rest. what is the velocity of the sled after you push it?
The velocity of the sled after being pushed is determined through the application of the work-energy theorem, calculating the work done as the force times distance and equating this to the change in kinetic energy. This results in a velocity of approximately 7.9 m/s.
Explanation:The subject of this problem pertains to the area of physics known as kinematics, specifically the forces and acceleration involved when an object is set into motion. To solve this problem, we can utilize the work-energy theorem. The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy.
In this case, the work done is the force applied to the sled times the distance the sled is pushed or W = Fd. Substituting the given values into the equation, we get W = 180 N * 2.5 m = 450 Joules.
The work done on the sled results in a change in the sled's kinetic energy. The kinetic energy (KE) of an object is given by KE = 0.5*m*v^2, where m is the mass of the object and v is its velocity.
Setting the work equal to the change in kinetic energy (since the sled starts at rest, the change in kinetic energy is just its final kinetic energy), we get 450 J = 0.5*15 kg*v^2. Solving for v gives a velocity of approximately 7.9 m/s.
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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.
How is chemical activity used to separate copper from its ore?
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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
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.
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
The process of heat radiation is the ONLY method of heat transfer that can occur
B.through space
Radiation is the process of heat transfer through electromagnetic waves, which does not require a medium. This is the only method of heat transfer in space, as heat from the Sun reaches Earth and space suits maintain astronaut body temperature. Highly reflective materials are often used to harness or minimize heat transfer by radiation.
Heat transfer by radiation
Heat transfer by radiation is a fundamental concept in physics where electromagnetic waves carry energy through space without the need for a medium. This method of heat transfer is especially relevant in space, where there is a lack of matter to support conduction or convection. A familiar example of radiation is the heat from the Sun reaching the Earth, despite the vast emptiness of space in between. Objects that absorb radiation, such as humans or the Earth itself, will eventually emit that energy, mostly as infrared radiation which is a form of electromagnetic waves with longer wavelengths compared to visible light.
Space suits, for example, combat the cold of space not through thick insulation, but by reflecting the infrared radiation that would otherwise escape from the astronaut's body. Since no material medium exists in space, heat cannot be transferred by conduction or convection, making radiation the only viable method of heat transfer in such environments. The effectiveness of radiation as a heat transfer method is harnessed and minimized using highly reflective materials.
Radiation is thus crucial for understanding how heat is transferred in situations where the other forms of heat transfer - convection and conduction - cannot occur. Learning about these modes of heat transfer is essential for fields ranging from engineering to environmental science.
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.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.
Adding energy or increasing the speed of the particles at very low pressure in a solid would cause
A) boiling.
B) condensation.
C) melting.
D) sublimation.
what best describes the degree to which a material can transmit heat
- melting point
- boiling point
- thermal conductivity
- electrical conductivity
Answer:
thermal conductivity
Which is a common unit of density?
A. The g
B. G/ml
C. Cm3
D. G/s
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
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:
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
Can you help me with number 4 plz
What is the value of -2 + 100 - (-50)?
Scientific models A. help to predict future events B. Prove that an object exists C.determine the distance to far off stars D. Show that the scientific method works
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.
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?
The x-coordinates of two objects moving along the x-axis are given as a function of time (t). x1= (4m/s)t x2= -(161m) + (48m/s)t - (4 m/s^2)t^2 Calculate the magnitude of the distance of closest approach of the two objects. x1 and x2 never have the same value.
To calculate the magnitude of the distance of closest approach of the two objects, we need to find the minimum distance between the x1 and x2 functions. The minimum distance occurs when the derivative of the difference between x1 and x2 is zero. We can find this point by equating the derivatives of x1 and x2 and solving for t.
Explanation:To calculate the magnitude of the distance of closest approach of the two objects, we need to find the minimum distance between the x1 and x2 functions. The minimum distance occurs when the derivative of the difference between x1 and x2 is zero. We can find this point by equating the derivatives of x1 and x2 and solving for t. Once we have the value of t, we can substitute it back into either x1 or x2 to find the minimum distance.
Take the derivative of x1 with respect to t: x1'(t) = 4 m/sTake the derivative of x2 with respect to t: x2'(t) = 48 m/s - 8 m/s^2 * tSet x1'(t) = x2'(t) and solve for t: 4 m/s = 48 m/s - 8 m/s^2 * tSolve the equation: t = 5 sSubstitute t=5s into x1 or x2 to find the minimum distance: x1(5s) = 20 mTherefore, the magnitude of the distance of closest approach of the two objects is 20 meters.
Which value is equivalent to 178 centimeters?
1.78 millimeters
17.8 millimeters
1.78 meters
1.78 × 10-2 micrometers
1.78 × 10-5 kilometers
Answer:
1 centimetres = 10 millimetres
178 centimetres = 10 × 178 = 1780 millimetres
1 meters = 100 centimeters
178 centimeters = 178 ÷ 100 = 1.78 meters Plato answer
1 cm = 10 mm
1 mm = 1000 micrometers
1 cm = 10000 micrometers
178 cm = 178 × 10⁴ micrometers
1 kilometre = 1000 metres
1 metre = 100 cm178 cm = 178 ÷ 100 = 1.78 metres
1.78 metres = 1.78÷1000 = 1.78 × 10⁻³ kilometres
Explanation: