The characteristic that a good scientific question should have is that it should lead to a testable hypothesis. This means that the question should be specific enough to allow for the formulation of a testable hypothesis that can be supported by empirical evidence.
What is another characteristic of a good scientific question?A good scientific question should also be relevant to the field of study and potentially contribute to our understanding of a phenomenon. The answer to the question doesn't need to be already known, and it may not be answerable just through investigation.
What is the empirical evidence?Empirical evidence is the information or data obtained through observation, measurement, and experimentation. The evidence is based on direct or indirect observations of the natural world, as opposed to assumptions, beliefs, or opinions.
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pls help
Can humans start to direct their own evolution and take over natural selection? Are we influencing our own evolution?
Answer:
yes they can
Explanation:
sure if they want
please I need it now
write an essay of 350 words on thank God it is a dream
Answer:
............. really?
A student does an experiment with a string vibrating at 20 hertz and observes the resonance pattern shown in the
diagram:
What is the speed of the wave on the string in Figure 24-3A?
4.0 m/s
8.0 m/s
20 m/s
100 m/s
Answer:
v = 8.0 m/s
Explanation:
The diagram clearly shows that the string is vibrating in the 5th harmonic. Hence, the length of string in terms o wavelength can be given as:
[tex]L = \frac{5}{2}\lambda\\\\\lambda = \frac{2}{5} L[/tex]
where,
λ = wavelength = ?
L = Length of string = 1 m
Therefore,
[tex]\lambda = \frac{2}{5}(1\ m)\\\\\lambda = 0.4\ m[/tex]
Now, the speed of the wave can be given by the following formula:
[tex]v = f\lambda\\[/tex]
where,
v = speed of wave =?
f = frequency of wave = 20 Hz
Therefore,
[tex]v = (20\ Hz)(0.4\ m)\\v = 8\ m/s\\[/tex]
Hence, the correct answer is:
v = 8.0 m/s
In an electrical circuit, what happens to the current flowing through the wire if the initial voltage of 18 V is doubled, and the initial resistance of 35 Ohms is reduced by a factor of 4?
ANSWER QUICKLY PLEASE! ITS URGENT!
The current is increased by a factor of 8.
From 18/35 A. to 144/35 A.
The electric current changes from 0.514 ampere to 4.14 ampere, i.e, electric current flow in the circuit increases 8 times.
What is electric current?A stream of charged particles, such as electrons or ions, travelling through an electrical conductor or a vacuum is known as an electric current. The net rate of electric charge flowing through a surface or into a control volume is how it is calculated.
Initial electric current flowing through the circuit = (18 volt ÷ 35 ohms)
= 0.514 ampere.
When the initial voltage of 18 V is doubled, and the initial resistance of 35 Ohms is reduced by a factor of 4, electric current flowing through the circuit will be = (2 × 18 volt )÷ (35 ohms÷4)
= 4.114 ampere.
Hence, electric current changes from 0.514 ampere to 4.14 ampere, i.e., electric current flow in the circuit increases 8 times.
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Electromagnetic spectrum, i need help putting them in order. And maybe get a little help understanding this subject
Explanation:
In order from highest to lowest energies the parts of electromagnetic spectrum are named as
Gamma rays,
X-rays,
ultraviolet radiation,
visible light,
infrared radiation,
and radio waves.
Microwaves are a subsections of radio waves. They are used in microwave ovens to heat the food items.
This is expected EM spectrum in field of science.
The Tennessee Valley Authority's coal-fired Kingston plant in Tennessee generates 10 billion kilowatt-hours a year by burning 13,000 metric tons of coal a day, supplying electricity to almost 700,000 homes. If all of the 7.7 billion metric tons of coal consumed worldwide in 2015 was converted to electricity, it would have produced approximately _____ billion kilowatt-hours of electricity. Assume the same efficiency as the Kingston plant.
Answer:
Approximately 16228 billion kilowatt-hours of electricity will be produced.
Explanation:
According to the statement, yearly energy production is directly proportional to amount of carbon to be burnt. Then, we proceed to estimate the yearly energy production from worldwide coal consumption ([tex]E[/tex]), in kilowatt-hours, by simple rule of three:
[tex]E = 10\times 10^{9}\,kWh\times \frac{7.7\times 10^{9}\,ton}{4.745\times 10^{6}\,ton}[/tex]
[tex]E = 16228\times 10^{9}\,kWh[/tex]
Approximately 16228 billion kilowatt-hours of electricity will be produced.
If a species experiences a helpful mutation, like camouflage, explain how that mutation would help the species to better survive and flourish. Again, be sure to explain how and why that mutation would be helpful.
Help me please I need it fast, I’ll give b if correct!!!
Links = reported
Wrong answer= report (depends if it’s a whole different answer)
Answer:
A helpful mutation like camoflage would immensely help a species survive and flourish. The reason being the appliances of such a mutation. Camoflage is one of the most apllicable of abilities. It can be used as a defense mechanism, to hide in plain sight, it can be used offensively to avoid being seen while hunting and it can even be used as a form of communication between the species. All of these appliances would greatly benefit the species and would most definitely help it survive and flourish.
HELP ME PLSSS What are the possible genotypes
of the F, offspring? What are the
possible phenotypes of the F,
offspring?
Answer:
the answer is b i think
Answer:Within an individual organism, the specific combination of alleles for a gene is known as the genotype of the organism, and (as mentioned above) the physical trait associated with that genotype is called the phenotype of the organism.
Explanation:
The phenotype is the trait those genes express. ... Looking at the possible offspring, each box (or possible offspring) has two copies of the dominant gene. This means there is a 100% chance of the offspring having brown eyes, or being BB. It's important to note here that each box represents a possible offspring.
what do you mean by efficiency of a machine?
Answer:
Efficiency in general means How well an object does with respect to its designated purpose for example a battery with Voltage of 10 volts won't exert 10 volts but slightly less due to internal resistance let's say 8V so efficiency will be 8/10 x100 = 80%
Same thing with a machine/engine If an engine is designed to produce 150 horsepower it won't give you the full energy due to part of the energy being dissipated in form of heat due to friction so let's say 145 hp is produced which is 96% efficiency
19.5 J
10. A ball is traveling at 20 m/s and has a kinetic energy of 40 J. Calculate the mass of
the ball.
a) 8.6 kg
b) 0.2 kg
c) 34.6 kg
Answer: Sorry I don’t have time to give calculate it but I have a PowerPoint that could help.
Explanation: https://web.njit.edu/~gary/111/assets/HW8_sol.pdf
any help would be appreciated! :)
Answer:
primary voltage/secondary voltage = number of turns on primary coil/number of turns on secondary coil
V1/V2= N1/N2
1.5/5 = 150/N2
0.3 = 150/N2
N2= 150/0.3
N2 = 500
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Could Mars be a suitable alternative to Earth as a second home for humans? Explain your answer.
Answer:
yes
Explanation:
After the Earth, Mars is the most habitable planet in our solar system due to several reasons: Its soil contains water to extract. It isn't too cold or too hot. ... Gravity on Mars is 38% that of our Earth's, which is believed by many to be sufficient for the human body to adapt to.
HELP!!! 50 POINTS
4. Predicting What would have happened, in terms of thermal energy transfer, if the water temperature had originally been10.0°C? Explain your reasoning.
Context:Background InformationThe quantity of energy transferred by heat from a body depends on anumber of physical properties of the body and its surroundings. For a given substance, the rate at which thermal energy is transferred by conduction depends on temperature difference, cross-sectional area,and a thermal conductivity constant that is unique to the substance.By choosing one of these properties as a manipulated variable and making the other properties controlled variables, the effect of the manipulated variable on thermal conduction can be determined experimentally.In this investigation, you will study the rates of cooling of three containers of water of equal volume but different surface area.
Answer:
do u have a picture of the question?
Explanation:
it would be easier to solve
If the angle of reflection is 25 degrees, the angle of incidence is
Answer:
25 degrees
Explanation:
The angle of incidence equals the angle of reflection
PLEASE ANSWER ASAP bbb
Answer:
if one bulb burns out the other bulbs will also turn off because they are connected to each other.
Can someone please help me with science.
Answer:
I believe the answer it D
Explanation:
pls answer this right I will give you a brainiest.
Answer:
i would pick c
Explanation:
because, w and y it is very bright and bright can be very conductive like it said.
A starting system voltage drop test is being done. Technician A says the higher the voltage drop, the lower the resistance in the circuit. Technician B says a high-voltage drop in the cranking circuit wiring can cause slow engine cranking. Which technician is correct?
1. Technician A only
2. Technicia B only
3. Both technian
4. Neithr A nor B
Answer:
2. Technician B only
Explanation:
Given that a starting system voltage drop test is being done. Technician A says the higher the voltage drop, the lower the resistance in the circuit. Technician B says a high-voltage drop in the cranking circuit wiring can cause slow engine cranking. Which technician is correct?
1. Technician A only
2. Technicia B only
3. Both technian
4. Neithr A nor B
According to ohms law, the current is directly proportional to the voltage and inversely proportional to the resistance.
Increase in voltage drop will surely cause increased in resistance in the circuit.
Therefore, Technician A is not correct.
A drop in voltage will surely reduce the efficiency of a machine which will cause slow engine cranking.
Therefore, Technician B is correct.
So the right answer is 2 only B is correct.
Please help will mark brainliest
Why is the melting of ice a physical change?
A.
It changes the chemical composition of water.
B.
It does not change the chemical composition of water.
C.
It creates new chemical bonds.
D.
It forms new products.
E.
It is an irreversible change that forms new products.
Answer:
b
Explanation:
it melts yes but it's still water [same element] so there fore it's a physical change
Answer:
It does not change the chemical composition of water. Explanation: A physical reaction is defined as the reaction in which a change in shape, size takes place. No new substance gets formed in these reactions.
Explanation:
Hope this helped
Photos A and B both show the same field of view containing a star-forming molecular cloud. One of the photos was taken in visible light and the other in infrared light. Which one is the visible-light photo, and how do you know?
Hello. You did not present the photos to which the question refers, which makes it impossible for your question to be answered. However, I will try to help you in the best possible way.
Your question informs us that the photos are of a star-forming molecular cloud. The molecular cloud has dust, especially when the star is forming. In this case, we must keep in mind that in photos taken in visible light, the dust is able to appear, especially in space, where this dust would not reflect light, unlike the star in formation. In this case, we can conclude that in the case of the photo taken in visible light, we could see the molecular cloud as a dark spot, due to the dust. However, it would not be possible to view it in a photo taken with infrared light.
a force of 1.8 extends a wire by 0.4. what force will extend wire by 1.25cm if the elastic limit is not exceeded.
Answer:0.27
Explanation:
A DC generator is the same as a(n)
A. electric motor.
B. AC generator.
C. armature.
D. electric current.
Answer:
A DC generator is the same as a(n)
C. armature
what is a underwater mountain that rises above sea level called
Answer:
Undersea mountain ranges are mountain ranges that are mostly or entirely underwater, and specifically under the surface of an ocean. If originated from current tectonic forces, they are often referred to as a mid-ocean ridge. In contrast, if formed by past above-water volcanism, they are known as a seamount chain.
Explanation:
Which of the following is an example of potential energy?
A. The plant sitting on the desk
B. The airplane Flying in the air
C. The car driving on the Street
D. The person standing up
Answer:
A
Explanation:
potential energy is energy due to position
Why is your weight the same any place on Earth?
Answer: A person can weigh differently at various place on Earth because of the fluctuations in Earth's gravity, according to a new high-resolution map. ... Earth's gravity is weaker at the equator due to centrifugal forces produced by the planet's rotation
Explanation:
other quanto
Dalex when
the face
into that one dan
a Explains why fish can
Survive under
Horan
I'm not sure what you were trying to put here
The infrasound waves were at just the right ________________ to vibrate the human eye. no frikin links!!!
Answer:
pitch
Explanation:
The spring to launch a pinball in a pinball machine is compressed 25 cm and has a spring constant of 140 N/m.
a. How much energy is stored in the spring when it is fully compressed?
b. If friction removes 3.75 J of energy while the spring launches, how much energy will the pin ball end up having?
Answer:
I think it is 5.6. This is my answer
the object having uniform velocity has zero acceleration why
Because that's what "uniform velocity" means.
Uniform velocity means constant speed in a straight line.
Acceleration means changing speed OR changing direction.
Can someone please help me with this
Answer:
B because the earth rotational axis tilt away from the sun.