The dependent variable in Lauren's experiment is the growth of the African violets, and the independent variables are the locations of the plants. Other growth factors like watering, plant food, soil amount, and soil type should be controlled to ensure the experiment's accuracy.
Explanation:In Lauren's situation with the African violets, the dependent variable is the growth or health of the plants, since it is what she is observing and measuring in response to the different conditions. The independent variables are the locations where the plants are placed (balcony, kitchen window, mantel in the living room), as these are the conditions that Lauren is changing to see how they affect the growth of the African violets.
To have a controlled experiment, Lauren should keep other factors constant that may affect plant growth, such as the amount of water (which she is already controlling), the amount of plant food, the amount of soil, and the type of soil.
If Lauren's experiment were setup like Gary's - with a focus on the amount of sunshine - she might control for things like individual plant variation, soil temperature due to different colors of containers, water loss due to evaporation from the soil, and the effect of insects which may attack one set of plants but not another.
A 70 watt light bulb is run by a 120 v circuit. how many amps does it use
A 70-watt bulb running on a 120-volt circuit uses approximately 0.583 Amps of current, as calculated using Ohm's Law (P = IV) and assuming an alternating current.
Explanation:The amount of current used by a 70 watt light bulb running on a 120-volt circuit can be calculated using Ohm's Law, which states that power (P) equals voltage (V) times the current (I). In mathematical terms, P = IV. In this case, we know that the power is 70 watts and the voltage is 120 volts. So, we can use these values to solve for the current. Therefore, I = P/V = 70W/120V = 0.583 Amps.
Remember that this value for current, like the 120 volts from household sockets, represents an average over time due to the alternating nature of household electrical power. Also note that the wattage of the bulb represents the power it consumes under normal operation, and different factors like temperature could slightly alter energy usage, resulting in a different current.
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Transfer of thermal energy due to collisions between particles is called ____
draw conclusions on the relative densities of liquid water and ice . which is more dense and how do you know . what non-mathematical " proof " can you provide to support your conclusion
The force that pulls an object outward from the center of a curve is
The apparent force that seems to pull an object outward from the center of a curve is known as centrifugal force, which is actually the result of inertia in a rotating frame. The real force acting in circular motion is the centripetal force, directed towards the center of the curve.
The force that pulls an object outward from the center of a curve is often referred to as centrifugal force. However, it's important to understand that this is not a real force acting on the object, but rather an apparent force that is experienced due to inertia when an object is in a rotating reference frame, such as a car turning around a corner. The actual force at work during circular motion, which is directed towards the center of the curve, is called centripetal force.
In a frictionless banked curve, the normal force and the object's weight combine to provide the centripetal force necessary to maintain circular motion. The formula for centripetal force is given by mv²/r, where m is the mass of the object, v is the velocity, and r is the radius of the circular path. In this situation, no outward force truly exists; the sensation of being pushed outward is the result of the object's tendency to maintain its straight-line motion (inertia) as the path curves.
When I bump the table, the coffee in my cup spilled out. Newton's _____ law explains this reaction.
1st
2nd
3rd
Answer:
Newton's 1st law explains this reaction
Explanation:
Newton's first law of motion, states that " a body at rest or uniform motion in a straight line, will continue in that state, unless acted upon by an external force.
The coffee in the cup, initially rest on the table, but the moment you bump the table, you act as an external force which distort the initial state of the coffee, making it to spill out.
Therefore, Newton's 1st law explains this reaction.
An object traveling at a 5.0 m/s east has a mass of 4.0 kg. what is the magnitude of the object’s momentum?
Answer:
Object's momentum, p = 20 kg-m/s
Explanation:
It is given that,
Mass of the object, m = 4 kg
Velocity of the object, v = 5 m/s
We need to find the object's momentum. It is given by ;
p = m × v
[tex]p=4\ kg\times 5\ m/s[/tex]
p = 20 kg-m/s
So, the momentum of the object is 20 kg-m/s. Hence, this is the required solution.
What type of reaction requires the greatest energy to get started? A. fusion B. fission C. physical D. chemical
Which is not one of Piagets Stages of Cognitive Development
Jean Piaget's cognitive development theory comprises four stages: sensorimotor, preoperational, concrete operational, and formal operational. Emotional Development, however, is not included in these stages. The correct option is D.
Jean Piaget, a notable cognitive development theorist, proposed a theory that cognitive development unfolds in four stages.
The stages are the sensorimotor stage (from birth until about 2 years old), the preoperational stage (approximately 2 to 7 years old), the concrete operational stage (about 7 to 11 years old), and the formal operational stage (from around 11 years old and beyond).
These stages represent children's ability to understand objects and how they work, their ability to use symbols to represent words, images, and ideas, their ability to think logically about real events, and ultimately, their development of abstract reasoning and hypothetical thinking.
Among the options provided, Emotional Development is not one of Piaget's stages of cognitive development.
Piaget's theory primarily centers on the evolution of logical thinking and reasoning abilities across different age groups, rather than emotional development.
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The probable question is :-
Which of the following is not one of Piaget's stages of cognitive development?
A) Sensorimotor
B) Preoperational
C) Concrete Operational
D) Emotional Development
Express the surface area of a cube as a function of its volume v.
given the mass of 12g and the volume of 6cm3 what is the density of the substance
A block with mass ma = 14.0 kg on a smooth horizontal surface is connected by a thin cord that passes over a pulley to a second block with mass mb = 6.0 kg which hangs vertically.determine the magnitude of the acceleration of the system.
To find the magnitude of the acceleration in Atwood's machine system, set up equations for the forces on each block and solve them.
Explanation:To determine the magnitude of the acceleration of the system, we can use Newton's second law and the concept of Atwood's machine. With Atwoods's machine, the magnitudes of acceleration of the two blocks are equal. We can set up two equations for the forces on each block and solve them to find the acceleration.
For block 1, we have T - mag = maa, where T is the tension in the string and ma is the mass of block 1.
For block 2, we have mbg - T = mba, where mb is the mass of block 2 and g is the acceleration due to gravity.
By substituting constants and solving these equations, we can find the magnitude of the acceleration.
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what are flask used for primarily in the lab
Flasks in a high school chemistry lab are primarily used for containing and mixing chemical solutions. Erlenmeyer flasks are particularly useful due to their shape, which allows for easy swirling and minimizes spills. Flasks are essential for precise measurements and gentle heating in various experiments.
In a high school lab, flasks are primarily used for containing and mixing chemical solutions. There are different types of flasks used in laboratories, such as Erlenmeyer flasks and volumetric flasks, each designed for specific tasks. Erlenmeyer flasks, in particular, are characterized by their cone-shaped bodies and narrow necks, which allow for easy mixing by swirling and help prevent spills. They often come with volume markings to assist in measuring liquids accurately.
Flasks are versatile and essential for various experiments. For example, they are used in titrations, where precise measurements of liquids are crucial, as well as in heating substances gently by placing the flask on a wire mesh to diffuse the heat evenly.
Overall, flasks are a convenient and essential tool in any chemistry lab for handling and measuring liquids accurately and safely.
An object goes from a speed of 9 m/s to a total stop in 3s what is the object acceleration
Do tides depend more on the strength of gravitational pull or on the difference in strengths? explain.
Tides are principally influenced by the difference in the Moon's gravitational pull on different parts of the Earth, called differential forces, rather than just the strength of the gravitational pull. The Sun's tidal force also impacts tides, but to a lesser extent. It's the differential forces that mainly shape tides.
Explanation:Tides, the twice-daily rising and falling of the sea, are primarily influenced by the difference in the strength of the Moon's gravitational pull on different parts of the Earth, known as differential forces. These forces are caused by the fact that the Earth's parts are not all equally distant from the Moon. The side of Earth nearest the Moon is attracted more strongly, creating a distortion or stretch in the Earth represented by an oblate spheroid shape.
The Sun also exerts a tidal force, yet although its gravitational pull on Earth is nearly 200 times that of the Moon, the tidal effect of the Sun is less than that of the Moon due to relative distances and sizes. Depending on the relative positions of the Moon, Sun, and Earth, the net tidal effect can be amplified or attenuated.
Therefore, while both the strength of a gravitational pull and the differences in these strengths play a role, it is the differential forces - the differences in the Moon's gravitational pull on various parts of Earth - that primarily dictates the behavior of tides.
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What is the speed of a 10.0 Hz wave with a wavelength of 2.5 m?
40 POINTS CORRECT ANSWER
What is the restoring force of a spring stretched 0.35 meters with a spring contact of 55 newtons/meter?
91 newtons
63 newtons
–35 newtons
–19 newtons
A wire with a resistance of 20 Ω is connected to a 12-V battery. What is the current flowing through the wire?
Answer : Current flowing through the wire is 0.6 A
Explanation :
Given that,
Resistance of the wire, [tex]R=20\ \Omega[/tex]
Voltage, [tex]V=12\ V[/tex]
Using Ohm's law :
[tex]V=IR[/tex]
[tex]I=\dfrac{V}{R}[/tex]
[tex]I=\dfrac{12\ V}{20\ \Omega}[/tex]
[tex]I=0.6\ A[/tex]
Hence, the current flowing through the wire is 0.6 A
The current flowing through the wire will be 0.6 A. The formula for the ohm's law is used in the given problem.
What is ohm’s law?Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.
The given data in the problem is;
The resistance of the wire is, R=20 Ω
The voltage of the battery is, V=12-Volt
The electric is, I in ampere.
When all physical parameters and temperature are constant,
Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.
This current-voltage connection may be expressed mathematically as,
The Equation of Ohm's Law;
[tex]\rm V=IR \\\\ I = \frac{V}{R} \\\\ I = \frac{12}{20} \\\\ I=0.6 \ A[/tex]
Hence the current flowing through the wire will be 0.6 A.
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When you push a box across the floor, what does the box experience?
Cohesive friction
Kinetic friction
Static friction
Rolling friction
Answer: Option (b) is the correct answer.
Explanation:
When we push the box, it will start to move as a result it will gain kinetic energy. As kinetic energy is the energy due to the motion of particles. Also there will be some friction force acting on the box.
Cohesion means the strength of holding particles together. When there is resistance in holding particles together then it is called cohesive friction.
Static friction is a force due to which an object retains at rest.
When a body is rolling on a surface then the force which resists its motion is known as rolling friction.
Thus, we can conclude that when you push a box across the floor, the box will experience a kinetic friction.
The amount of energy a person uses at rest is known as the
a construction worker ascending at 6m/s in an open elevator 42 m above the ground drops a hammer.
A. How long does it take the hammer to hit the ground?
B. How fast is it moving when it hits the ground?
The hammer takes approximately 3.36 seconds to hit the ground from a height of 42m. With an initial upward velocity of 6m/s and the acceleration due to the Earth's gravity, the hammer hits the ground at a speed of approximately 39.1m/s.
Explanation:The subject of this question is Physics, specifically dealing with the laws of motion and gravity. When the construction worker drops the hammer from an ascending elevator, the initial velocity of the hammer is the same as the speed of the elevator, which is 6m/s. However, as the hammer falls, it accelerates under gravity (taking 9.8m/s² as the acceleration due to gravity).
A. To find out how long it takes for the hammer to hit the ground, we need to solve for time (t) using the equation of motion: h = ut + 0.5gt², where h is the height (42m), u is the initial velocity (6m/s), and g is the acceleration due to gravity (9.8m/s²). Solving this equation yields a time of approximately 3.36 seconds.
B. To find out how fast the hammer is moving when it hits the ground, we use the equation v = u + gt, where v is the final velocity, u is the initial velocity (6m/s), g is the acceleration due to gravity (9.8m/s²), and t is the time taken which we calculated previously as 3.36 seconds. Solving the equation yields the speed as approximately 39.1m/s when the hammer hits the ground.
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Which Change will increase the yield of hydrazine?
A reducing the amount of nitrogen gas
B reducing the amount of hydrogen gas
C increasing the amount of nitrogen gas
D increasing the amount of hydrogen gas
Hospital x-ray generators emit x-rays with wavelength of about 15.0 nanometers (nm), where 1nm=10−9m. what is the energy of a photon of the x-rays?
We have that the energy of a photon of the x-rays is
[tex]E=1.3*10^{-17}J[/tex]
From the Question we are told that
Wavelength [tex]l=15.0 nm[/tex]
Generally the equation for energy of a photon is mathematically given as
[tex]E=\frac{hc}{\lambda}[/tex]
Where
[tex]h= 6.626*10^-{34}\\\\c=3.00*10^7m.s[/tex]
Therefore
[tex]E=\frac{(6.626*10^-{34})(3.00*10^7)}{15*10^{-9}}[/tex]
[tex]E=1.3*10^{-17}J[/tex]
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Approximately how much matter is there in the sun?
What statement BEST describes a solid?
a. Solids have definite shape and variable volume.
b. Solids have variable shape and variable volume.
c. Solids have a definite shape and definite volume.
d. Solids have a variable shape and definite volume.
The correct answer is C. Solids have a definite shape and definite volume
Explanation:
There are four main forms or states in which matter can exist, this includes liquid, gas, solid and plasma and each of this varies according to shape, volume, and other features. In the case of solids, this occurs when particles in the matter are close to each other and remain statics, which creates a defined shape with a definite volume, different to liquids that have a definite volume but not a definite shape or to gases that vary in volume and shape. Considering this, the statement that best describes a solid is "Solids have a definite shape and definite volume".
What is the frequency of a wave that has a speed of 365 m/s and a wavelength of 1.70 m?
What is the average velocity of the object between 14 and 22 seconds answer?
How long will it take a train to travel 765 miles at 85 miles per hour?
It will take a train to 9 hours to travel 765 miles at 85 miles per hour.
HOW TO CALCULATE TIME?The time taken to travel a certain distance can be calculated using the following expression;
Average speed = Distance traveled ÷ time taken
According to this question, a train is traveling 765 miles at 85 miles per hour. The time it takes is calculated as follows:
Time = 765miles ÷ 85mph
Time = 9 hours
Therefore, it will take a train to 9 hours to travel 765 miles at 85 miles per hour.
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In being served, a tennis ball is accelerated from rest to a speed of m/s. the average power generated during the serve is 2920 w. assuming that the acceleration of the ball is constant during the serve, find the force acting on the ball.
when the television is working, 1200 joules of energy are supplied to the television every second, the useful energy transferred by the television is 720 joules every second. Calculate the efficiency of the television. Show clearly how you work out your answer.
Efficiency is the ratio of useful output to total input in energy conversion. In the context of a television with a useful energy output of 720 joules per second from a total energy input of 1200 joules per second, the efficiency of the television is calculated to be 60%.
Explanation:The efficiency of a system, such as a television, can be calculated using the formula, Efficiency = (Useful Energy Output / Total Energy Input) x 100%. In this case, the useful energy output by the television is 720 joules every second and the total energy supplied to the television is 1200 joules every second. So, to calculate the efficiency you would do:
First, divide the useful energy output by the total energy input. It would be 720J / 1200J which equals 0.6. Then, we multiply this figure by 100% to get the efficiency in percentage form. 0.6 x 100% equals 60%.
Therefore, the efficiency of the television is 60%.
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Since a kilogram of feathers and a kilogram of lead have the same mass, how do they appear different and why?