Answer:
changes in genes
Explanation:
The correct answer would be changes in genes.
Variation refers to differences among living organisms of the same species. Variation in a population can be from 3 sources:
mutationrecombinationgenetic driftsA mutation refers to a sudden change in the DNA sequence of a gene. When a gene changes, new alleles are introduced into the gene pool and this creates variation within the population.
Recombination of genes arises from random mating/fertilization during sexual reproduction. Gamete formation results in gene recombination.
Genetic drifts refer to the changes to the alleles of the gene pool as a result of chance events. These changes further introduce variation into the population.
Hence, the correct answer among the options is changes in genes, also known as mutation.
What happens to the current in a circuit if a 10Ω resistor is removed and replaced by a 20Ω resistor? (voltage stays the same)
Current will increase
Current will not travel through the circuit
Current will stay the same
Current will decrease
If a 10Ω resistor is removed and replaced by a 20Ω resistor, at constant voltage, the current will decrease.
Ohms lawThis law states that, the current flowing in a conductor is directly proportional to the voltage in the conductor.
V = IR
where;
V is the voltage of the conductotI is the currentR is the resistanceI = V/R
At constant voltage, when the value of the resistance increases, the value of the current in the ciircuit wil decrease.
Thus, if a 10Ω resistor is removed and replaced by a 20Ω resistor, at constant voltage, the current will decrease.
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if the earth stops rotating about its axis then what will be the change in the value of g at a place in the equator-plane? Assume that earth is a sphere with a radius of 6.4*10*6m.
Answer:
if the earth stops rotating the value of g increases
How much work do you do when you lift a 100 N child 0.5 m?
Answer:
50 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 100 × 0.5
We have the final answer as
50 JHope this helps you
Student A says electric motors use the forces between electromagnets to make something start turning. Student B says electric motors use magnets moving near coils of wire to create a current in the wire. Which student is correct?
Answer:
Student A is correct.
Explanation:
An electromagnet can be defined as the magnet that is produced by the electric current passing through a wire surrounding a metal piece. In an electric motor, magnets surrounds the the coil carrying currents. Because of the magnetic field, the current carrying coil experiences a force and it starts to rotate. Thus the electric motors uses the forces between the electromagnets to start running.
Therefore, student A is correct.
A 50 kg ball rolls down the street at 5 m/s.
Calculate the momentum of the ball.
Answer: 250kg m/s
Explanation: You multiply 50kg and 5m/s to get 250kg m/s
The momentum of the ball is 250 Kgm/s
Given the following data;
Mass = 50 kgVelocity = 5 m/sTo find the momentum of the ball;
Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. It is a vector quantity and as such has both magnitude and direction.
Mathematically, momentum is giving by the formula;
[tex]Momentum = mass\; * \; velocity[/tex]
Substituting into the formula, we have;
[tex]Momentum = 50 * 5[/tex]
Momentum = 250 Kgm/s
Therefore, the momentum of the ball is 250 Kgm/s
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100 points
Please help me out
Answer:
hold up let me think
Explanation:
Answer: I know this is not the answer but i searched on brainly it gives the answer like search ur own question and find the right one :)
(NEED HELP PLEASE) A physics student goes to the roof of the school, 24.15 m above the ground, and drops a pumpkin straight down with an initial velocity of 0 m/s. How long does it take for the pumpkin to hit the ground?
Answer:
t = 2.2 s
Explanation:
Given that,
Height of the roof, h = 24.15 m
The initial velocity of the pumpkin, u = 0
We need to find the time taken for the pumpkin to hit the ground. Let the time be t. Using second equation of kinematics to find it as follows :
[tex]h=ut+\dfrac{1}{2}at^2[/tex]
Here, u = 0 and a = g
[tex]h=\dfrac{1}{2}gt^2\\\\t=\sqrt{\dfrac{2h}{g}} \\\\t=\sqrt{\dfrac{2\times 24.15}{9.8}} \\\\t=2.22\ s[/tex]
So, it will take 2.22 s for the pumpkin to hit the ground.
Which of the following is an opinion about
energy?
A) Power plants and batteries supply us with electrical energy
B) Kinetic energy is the energy of motion
C) Chemical energy is the most important source of
energy
D) Solar energy can be used to power people's
homes
Answer:the answer is c:chemical energy is the most important source of energy
Explanation:
The other three are proven facts.
b. Both cars passed a gas station 120km from the school. When did each car pass the gas
station?
What is an electromagnet and what are they used for?
Answer:
Electromagnets are used in all kinds of electric devices, including hard disk drives, speakers, motors, and generators, as well as in scrap yards to pick up heavy scrap metal. They're even used in MRI machines, which utilize magnets to take photos of your insides!
Explanation:
A magnet placed against the wall of a metal shed falls to the ground, where it attracts a nail. What is the most likely explanation for this observation?
The wall is the opposite pole from the magnet.
The shed is not made of iron or steel.
The magnet is not magnetized.
The nail pulled the magnet to the ground.
Answer:
the answer is B but I'm not completely sure
The reason for this observation is that the shed is not made of iron or steel.
The special magnetic property of iron is called ferromagnetism. As a result of this special magnetic property, iron can be attracted easily by a magnet. Steel is made from iron so it is also highly magnetic.
In the question, a magnet placed against the wall of a metal shed falls to the ground, where it attracts a nail. The reason for this is that the shed is not made of iron or steel.
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The table below provides information about several mineral samples that were used during an investigation.
mineral, color, streak, luster, hardness, apatite, pale, green, white, glassy, 5, halite, gray, white, glassy, 2.5, calcite, light, green, white, glassy, 3, feldspar, gray, white, glassy, 6,
Students were given a mineral sample to identify, and they made several observations about the sample. The mineral was green and made a white streak on a streak plate. It also had a glassy luster. The students were able to scratch the mineral with a sample of fluorite. Because of this, they determined that the mineral had a hardness of less than 4. The students summarized this information in the table below.
student, observations, color, green, streak, white, luster, glassy, hardness, less, than, 4,
Based on these observations, what is the identity of this mineral sample?
Apatite
Halite
Calcite
Feldspar
Answer:calcite
Explanation:
Based on these observations, Calcite is the identity of this mineral sample. Therefore, the correct option is option C among all the given options.
What is mineral?Typically created by inorganic processes, a mineral is a naturally occurring homogenous solid having a specific chemical composition as well as a highly organized atomic arrangement. About 100 of the known mineral species—the so-called rock-forming minerals—make up the majority of the known mineral species, which number in the thousands.
A mineral is different from its laboratory-produced synthetic counterparts since it must by definition develop through natural processes. Based on these observations, Calcite is the identity of this mineral sample.
Therefore, the correct option is option C among all the given options.
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WIISAS AVIOS HI HSNO&HI SNISInd) SI 1IWO) V AT A SPEED OF 50,000 KILOMETERS PER HOUR FOR U HOURS. WHAT IS THE DISTANCE TRAVELED BY THE COMET DURING THIS TIME?
Answer:
50,000U km
Explanation:
Given
Speed = 50000km/hr
Time of travel = U hours
Required
Distance covered
Using the formula;
Speed = Distance/Time
Distance = speed × time
Substitute the given values;
Distance = 50000 × U
Distance covered = 50,000U km
Hence THE DISTANCE TRAVELED BY THE COMET DURING THIS TIME is 50,000U km
what involves gathering and analyzing information related to the terrain and environment of enemy forces.
Answer:
Intelligence
Explanation:
Intelligence involves gathering and analyzing information related to the terrain and environment of enemy forces.
Intelligence is a very important tool in warfare which are often used by Army Generals and other war specialists. This also helps to make adequate plans and preparations in ensuring success and victory is achieved.
what is the weight of an object with a force of 35 pounds ?
Answer:
Wouldn't it be 17.5. Force doubles in weight.
Explanation:
Smithers thinks that a special juice will increase the productivity of workers. He creates
two groups of 50 workers each and assigns each group the same task (in this case,
they're supposed to staple a set of papers) Group A is given the special juice to drink
while they work, Group B is not given the special juice. After an hour, Smithers counts
how many stacks of papers each group has made. Group A made 1,587 stacks, Group
B made 2,113 stacks
What should Smithers conclusion be?
How could this experiment be improved?
Answer:
1. Group B
2. The juice
3. The number of stacks of paper
4. the juice did not help improve a quicker process
5. Group A can be given the juice, Group B can be given the juice without the special ingredient
USE QUIZLET FLASH CARDS IT CAN HELP YOU WITH A LOT OF QUESTION
This suggests that the special juice did not have a positive impact on productivity, and it may even have had a negative effect.
To improve the experiment: Randomized assignment, Control group considerations, Double-blind design, Larger sample size.
1. Smithers' conclusion should be that the special juice did not increase the productivity of the workers. Group B, which did not receive the special juice, actually produced more stacks of paper (2,113 stacks) compared to Group A, which had the special juice (1,587 stacks).
2. To improve the experiment, Smithers could consider implementing the following:
a. Randomized assignment: Ensure that the assignment of workers to groups is done randomly. Random assignment helps minimize any potential bias or confounding variables that could affect the results.
b. Control group considerations: In this experiment, Group B serves as the control group since they did not receive the special juice.
c. Double-blind design: To eliminate potential biases, both the workers and the person assessing their productivity should be unaware of which group received the special juice.
d. Larger sample size: Increasing the sample size can enhance the statistical power of the study and improve the reliability of the results. With a larger sample size, any differences between the groups can be more confidently attributed to the intervention.
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which two types of energy does a book have as it falls to the floor?
Answer:
the guy above me is correct
Explanation:
just did test
If you want to make a strong battery, should you pair two metals with high electron affinities, low electron affinities, or a mix? Explain your answer.
I’ll give brainliest please helppppppp
Answer:
A mix
Explanation:
A battery is an electrochemical cell that converts chemical energy into electrical energy. The chemical reactions in a battery ensures that current is produced.
A battery is made up of two electrodes which are the cathode and anode.
The cathode is the positive electrode and the anode is the negative one.
These electrodes are made up of metals.
Electrons moves from the anode to the cathode and current flows from cathode to anode.
At the anode oxidation occurs because electrons are produced here.
It needs to have low electron affinity.
At the cathode where reduction occurs, the electron affinity must be high.
This is the driving force for the production of electricity in electrochemical cells.
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Explanation:
A ball is thrown horizontally at 25.8m/s from 54 meter high cliff. How far from the base of the cliff does the ball land?
Answer:
85.66m
Explanation:
Given the following data;
Horizontal velocity = 25.8m/s
Height = 54m
Initial velocity = 0
We would first of all, solve for the time taken using the formula for maximum height of a projectile.
H = ½gt²
Where;
H is the maximum height measured in meters. g represents the acceleration due to gravity measured in meters per seconds square. t represents the time taken measured in seconds.We know that acceleration due to gravity is 9.8m/s²
Substituting into the equation
54 = ½*9.8t²
54 = 4.9t²
t² = 54/4.9
t² = 11.02
t = 3.32 secs
To find the distance;
Distance, x = velocity * time
x = vt
Substituting into the equation, we have;
x = 25.8*3.32
x = 85.66m
Qs # 1. A satellite orbits earth with a mean altitude of 361 Km. If the orbit is
circular, what are the satellite's time period and speed?
Qs # 2. The same satellite from problem # 1 orbits Jupiter at the same altitude
as before i.e 361 Km. what are the new Time Period and speed?
Answer:
40.6789km
243.098km
Explanation:
what did mosa and her team do to conduct the experiment
Answer:
time and complete a hands-on team challenge to gather evidence to support this idea. ... Using this data, students come up with ways in which they can mitigate their ... Learners will help Mosa figure out how Lystrosaurus fossils were found on
Explanation:
In the Make Extension, students conduct experiments to determine the role
How do molecules behave in a solid?
Answer:
In the solid state particles are held closely together and vibrate slightly. They exist in a regular arrangement - there is no regular arrangement in the other states.
Answer:
The motion and vibration of the atoms pull the individual molecules apart from each other
Explanation:
:)
Which of the following explains how an executive order differs from a law?
Answer:
Executive Orders state mandatory requirements for the Executive Branch, and have the effect of law. They are issued in relation to a law passed by Congress or based on powers granted to the President in the Constitution and must be consistent with those authorities.
Explanation:
A string is being pulled with a force of 20 N and moves a 5 kg block to the left at a constant speed. What is the coefficient of friction for between the floor and the block? Enter your answer as a decimal value (Example: 0.72) * I think the answer is 20 but this question is starting frustrating me
Answer:
μ = 0.4
Explanation:
As, the object is moving at a constant speed. Therefore, the unbalanced force on it must be equal to zero. So, the frictional force on the object must be equal to the force applied to it:
F = frictional force
F = μR = μW = μmg
where,
F = Applied Force = 20 N
μ = coefficient of friction between wall and floor = ?
m = mass of block = 5 kg
g = 9.8 m/s²
Therefore,
20 N = μ(5 kg)(9.8 m/s²)
μ = 20 N/49 N
μ = 0.4
A honeybee leaves the hive, traveling at a speed of 4 mph and returns 1 hour later. What was the distance traveled and the displacement of the honeybee in miles.
Answer:
This question appear incomplete
Explanation:
This question appear incomplete because of the absence of the time the honeybee spent while travelling from the hive. However, if we are to assume that the honeybee spent the same amount of time leaving/travelling as when it was returning. Then the formula to be used is
Speed = distance ÷ time
distance = speed × time
distance = 4 × 1
distance = 4 miles
To determine the displacement of the honeybee, the total distance covered by the honeybee in both to and fro journey will have to be summed (this is because displacement is a vector quantity).
Assuming the the speed and time spent while returning is the same with those spent while leaving, then the displacement will be distance × 2 (sum of all the distance covered)
Thus; 4 × 2 = 8 miles
What cloud type signals the coming of a warm front?
(I don't think it's physics but I couldn't find a subject that fit)
Answer:
altocumulus, cirrocumulus and cumulonimbus are cloud types that signals a warm front
Explanation:
The subject is geography
A toy car sits motionless at the top of a ramp. What will happen to the car if a balanced force acts upon it?
Answer:
kinetic energy because when the car moves again it will be faster then it was before
Please pass this on... ( #helpsavelives )
Who ever is reading this: I love u. U matter.
The world needs u hang in there ik it may be bad but u deserve the world
Answer:
Awww <3 you too! You matter too! thanks for the message!
Explanation:
Which item could you use in place of an ammeter to demonstrate that a
moving magnet causes an electric current to flow in a wire coil?
O A. A permanent magnet
B. A coil of aluminum wire
O c. A battery
O D. A lightbulb
Answer:
the answer is D
Explanation:
To test the flow of electric current through a circuit we can use a lightbulb. If a current is generated the bulb will light with brightness. Thus, option D is correct.
What is an ammeter?An ammeter is an electric device used to measure the current through a circuit. The current in ampere, milliampere or microampere is recorded by the ammeter through the deflection of its needle.
A magnetic field is always associated with an electric field where, the fields will be right angled to each other. A moving magnet in turn causes an electric current like a moving charge make an electric current.
To light a bulb electrical energy is needed. Thus, we can test the deflection in electric field using a a light bulb connected to the circuit. If there is a fine passage of electricity, the bulb will lighten. Thus, option D is correct.
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You are driving down a street in a car at 55 km/hr. Suddenly, a child runs into the street. If it takes you .75 s to react and apply the brakes, how many meters will you have moved before you begin to slow down?
Answer:
s = 11.46 m
Explanation:
Since, the reaction time is 0.75 s. Hence, the brakes shall be applied after this time. So, the car will start to slow down after covering a distance at the constant speed during this time. This distance can be given as follows:
s = vt
where,
s = distance covered by car before slowing down = ?
v = speed of car = (55 km/h)(1 h/3600 s)(1000 m/1 km) = 15.28 m/s
t = reaction time = 0.75 s
Therefore,
s = (15.28 m/s)(0.75 s)
s = 11.46 m