Answer:
Stars produce energy from nuclear reactions, primarily the fusion of hydrogen to form helium. These and other processes in stars have lead to the formation of all the other elements.
Explanation:
Answer:
The answer is C)
Explanation:
C) Nuclear fusion
1. In a biology experiment the number of yeast cells is determined after 24 hours of growth at
different temperatures.
a) Identify the independent and dependent variables in the experiment.
Answer:
Find the answer in the explanation
Explanation:
Given that In a biology experiment the number of yeast cells is determined after 24 hours of growth at different temperatures
The dependent variable depends on the value of the independent variable.
From the question above,
The independent variable is the temperature
While the dependent variable is the number of yeast cells
a kayaker moves 32 meters northward then 6 meters southward finally 24 meters northward
Answer:
50m [N]
Explanation:
Think of these directions as if they were on a 2D plane. (if you're talking about displacement)
If you go 32m [N] then 6m [S], it's like you're moving backwards (-). (thus, 32n-6s=26m [N])
Next, you go north again, so moving forwards (+). (thus, 26n+24n=50m [N])
The distance he paddled was (32m + 24m + 6m) = 56 meters.
His displacement after that was (32m - 6m + 24m) = 50 meters north.
A student leaves his house and walks 4 m east to friend's house, and then turns and walks 7 m west to the library in 120 seconds. Determine the student's average velocity for his entire walk.
Answer:
v_average = -0.025 m / s
the minus indicates that the velocity is to the west.
Explanation:
For this exercise we use the definition of average velocity
v_average = (x₂-x₁) / Δt
Let's keep in mind that the velocity is a vector, so the displacement is
x₂ - x₁ = 4 - 7 = -3
the minus indicates that the shift is to the west.
Let's calculate
v_average = -3 / 120
v_average = -0.025 m / s
the minus indicates that the velocity is to the west.
What is the final speed of a lion initially running at a speed of 30 m/s, if it accelerates at
a rate of 3 m/s3 for 5 seconds?
Given the information in the velocity vs. time graph,
what is the displacement of the object after 1 second?
m
After 3 seconds?
m
After 5 seconds?
Answer:
Given the information in the velocity vs. time graph, what is the displacement of the object after 1 second?
3m
After 3 seconds?
9m
After 5 seconds?
15m
Explanation:
The displacement of the object after 1-second would be 3 m, the displacement of the object after 3 seconds would be 9 m, and the displacement of the object after 5 seconds would be 15 sec
What is Velocity?The total displacement covered by any object per unit of time is known as velocity. It depends on the magnitude as well as the direction of the moving object. The unit of velocity is meter/second.
The mathematical relation between displacement and velocity is given by
Total displacement=Total time×velocity
As given in the problem A velocity-time graph is shown, displaying the behavior
Velocity from the velocity time graph
velocity =3 m/s
As we know the area under the velocity time curve represents the displacement covered by the object
displacement of the object after 1-second = 3×1
= 3 m
displacement of the object after 3-second = 3×3
= 9 m
displacement of the object after 5-second = 3×5
= 15 m
Thus, The displacement of the object after one second, three seconds, and five seconds would be three meters, nine meters, and fifteen meters, respectively.
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A driver starts her car and steps on the gas pedal. The car gradually
accelerates to 60 km/hr and maintains this velocity. A few minutes later, the driver suddenly slams on the brakes to avoid hitting a squirrel. As the car comes to a stop, the driver's body appears to lurch forward in the seat until it is restrained by the seat belt.
Which graph best represents the motion of a car described in the paragraph above?
Graph C
Graph D
Graph A
Graph B
Two teams are playing tug of war. Team A pulls to the right with a force of 450 N. Team B pulls to the left with a force of 415 N.
Answer:
Two teams are playing tug of war. Team A pulls to the right with a force of 450 N. Team B pulls to the left with a force of 415 N
Answer:
A. 35 N to the right.
EXPLANATION: 450 is going to the right so you subtract what is going against it. Which gives you 35. And because 450 is bigger than 415, it'll be going to the right.
Place thermometers near the edge of the table for easy retrieval.
True
True
False
Which of the following options correctly describe electromagnetic radiation? Select all that apply. Particles of electromagnetic radiation exhibit wave behavior. A particle of electromagnetic radiation is called a quantum. All electromagnetic radiation has the same frequency. Electromagnetic radiation includes visible light. The specific amount of energy a particular photon possesses is called a quantum.
Answer:
Particles of electromagnetic radiation exhibit wave behavior
Electromagnetic radiation includes visible light
The specific amount of energy a particular photon possesses is called a quantum
Explanation:
Electromagnetic waves propagate through space perpendicularly to a oscillating magnetic and electric field producing it. Both of these fields oscillates perpendicular to one another, and to the direction of propagation of the wave.
Electromagnetic waves exhibit both wave and particle light behaviors, this phenomenon is known as the wave-particle duality.
Visible light is part of the broad spectrum of waves in the electromagnetic wave spectrum. And each particle of an electromagnetic wave is known as a photon, and they carry energy in discrete amounts called quantum.
Electromagnetic radiation occurs when electric and magnetic fields emit radiations that travel in waves. Given this explanation, the options that correctly describe electronic radiation are;
Particles of electromagnetic radiation exhibit wave behavior.The specific amount of energy a particular photon possesses is called a quantum. Electromagnetic radiation includes visible light.Electromagnetic radiation is used to explain the disturbance that occurs when the electric and magnetic fields travel at the speed of light.
There are different frequencies of radiation that are emitted in the process. Some have high and low energies.
The radio waves, ultraviolet rays, and visible light are all examples of electromagnetic radiation
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*You water some plants with 4 different types of water (salt water, regular water, sugar water and distilled water). After a two-week period, the height of the plants is measured.
1) Independent Variable (IV):
2)Dependent Variable (DV):
3)Constants:
4)Control:
Answer:
Please find the answer in the explanation
Explanation:
Given that some plants were watered with 4 different types of water (salt water, regular water, sugar water and distilled water). After a two-week period, the height of the plants is measured.
1.) The Independent Variable (IV) are the different types of water
2)Dependent Variable (DV) are the height of the plant. Dependent variable depends on the independent variable.
3)Constant is the unchanged parameter which is the period - the two weeks
4)Control: is the quantity of water used.
Sea and land breezes over a large region that change direction with the seasons are called_____________.
A substance has density ρ, mass m, and volume V. If the volume is tripled, what is the new mass?
Since the density of the substance is ρ (rho),
==> every cm³ of this substance has ρ grams of mass.
Then
==> V cm³ of it has ρV grams of mass. That's ' m '.
and
==> 3V cm³ of it has 3ρV grams of mass. That's ' 3m '.
Question 8 of 10
Which term refers to a variable that a scientist adjusts during an experiment?
A. Dependent variable
B. Manipulated variable
C. Responding variable
D. Empirical variable
Answer:
B. Manipulated Variable
Answer:responding variable
Explanation:
Apex users
state the sources of alternating current
Answer:
hudroelectricity
..........
Answer:
generator, crystal oscillator, alternator are sources of AC current.
Which of the following is not an essential feature of scientific explanations? a. They must be subject to testing. b. They strictly pertain to the physical world. c. Their validity is judged based on objective observations. d. Once supported by observation, they can be viewed as a fact
Answer:b
Explanation:
The correct option is b.
The following are the essential feature of the scientific explanations:
It should be subjected to the testing. The validity should be judged depend upon the objective observations. Once the observation is supported afterwards it should be viewed as fact.Learn more: brainly.com/question/17429689
How can you use the position-time graphs for two in-line skaters to determine if and when one in-line skater will pass the other one?
Explanation:
Position-time graphs measure/express the position of a skater over time relative to the start or finish of the race (depends on how it is used). Note: are the skaters in line vertically or horizontally? Like is one directly behind the other or are they next to each other?
If the two skaters are in line horizontally with each other, then their position will be the same relative to the start or finish of the race. This means if one passes the other one, the position would be different for all times after they pass. On the graph, it would look like one single line at the start (as position is same) which splits into 2 (representing the new difference in position due to 1 passing the other.
If the two skaters are in line vertically, their lines on the graph will appear parallel to each other (assuming they are going same speed) because the position is changing at the same rate, one is just reaching the same point after the other. If the skater behind overtakes the one in front. The lines on the graph will cross and continue either in parallel but with the other line on top to represent the moment where their position is the same right before they pass and after, where the second skater is now in front.
Hope this helped!
a car travels at a speed of 30 mph. how far does the car travel in 2 hours
Answer:
The car would travel 60 miles in 2 hours.
Explanation:
The distance for an hour is already given, 30 miles per hour.
Given this you could multiply 30 by 2 which gives you 60.
The distance of the car is its speed times the time taken. The speed of the car is 30 miles per hour and time of travel is 2 hours. Then, the distance travelled is 60 miles.
What is speed?Speed of a moving object is the measure of the distance travelled per unit time. The rate of speed is called velocity. Velocity of an object is a vector quantity.
As the object is covering more distance within small time, then the object is said to have greater speed. Speed of an object also depends on is mass.
Given the speed = 30 mph
time taken = 2 hours
distance = speed × time
= 30 × 2 = 60 miles.
Therefore, the distance travelled by the car is 60 miles.
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What is the displacement of the elevator between 8 s and 24 s?
Answer:
The displacement of the elevator between 8 s and 24 s is 6 m.
Explanation:
Given that,
Initial time = 8 s
Final time = 24 s
We know that,
Displacement :
Displacement is the difference between initial position and final position.
In mathematically,
[tex]D=x_{f}-x_{i}[/tex]
We need to calculate the displacement
Using formula of displacement
[tex]D=x_{f}-x_{i}[/tex]
Put the value from graph
[tex]D=15-9[/tex]
[tex]D=6\ m[/tex]
Hence, The displacement of the elevator between 8 s and 24 s is 6 m.
Answer:
See attached.
Explanation:
See attached.
A train travels a 400-km route and makes five stops in seven hours. Which equation is used to calculate the train’s average speed?
A.
Average speed = Sum of instantaneous speeds
B.
Average speed = Total distance x Total time
C.
Average speed = Total distance + Total time
D.
Average speed = Total distance ÷ Total time
If you add 50.0 mL of water to a beaker containing 22 mL of water, then how much water do you have in the beaker?
Answer:
72 mL
Explanation:
if you add 50.0 mL of water to a beaker containing 22 mL of water, then the total in the beaker is 50.0 + 22 = 72 mL
action and reaction are equal in magnitude and opposite in direction then why do they not balance each other.
Answer:
Newton’s third law of motion states that every action has an equal and opposite reaction. This indicates that forces always act in pairs. Reaction forces are equal and opposite, but they are not balanced forces because they act on different objects so they don’t cancel each other out.
What is the power of 10 when 0.00503 is written in scientific notation
A perfect bouncy ball would continue bouncing the same height forever. But in reality, the ball stops bouncing because energy is "lost" to ...
A.sound energy
B.compression of the ball
C.heat energy absorbed by the ball
D.all answers are true
Answer:
D. all answers are true
The ball stops bouncing because energy is to sound energy, compression of the ball, and heat energy absorbed by the ball. Thus, the correct option is D, i.e. all of the above.
How energy is lost in a physical state?The law of conservation of energy, it states that energy can neither be created nor be destroyed in any physical state, although it may get transformed into another form.
The same principle is followed by the bouncing ball. In a closed system, its energy is never lost but it may get transformed into sound energy, heat energy which is absorbed by the ball, and compression which stimulates the process of bouncing the ball.
It is a principle of physical science that due to some characteristics the energy may be transformed into other form.
Therefore, the correct option is D, i.e. all of the above.
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A race car starts from rest and speeds up uniformly to the right until it reaches a maximum velocity of 60m/s^2
What is the acceleration of the race car?
Question:
A race car starts from rest and speed up uniformly to the right until it reaches a maximum velocity of 60m/s in 15 secs
Answer:
4m/s²
Explanation:
The acceleration of a body in uniform motion can be found by using one of the equations of motion as follows;
v = u + at ------------------(i)
Where;
v = final velocity of the body
u = initial velocity of the body
a = acceleration of the body
t = time taken for the motion
From the question, the body is the race car and has the following:
v = 60m/s²
u = 0 [since the car starts from rest]
t = 15 secs.
Now, substitute these values into equation(i) as follows;
60 = 0 + a(15)
60 = 15a [Divide through by 15]
[tex]\frac{60}{15}[/tex] = [tex]\frac{15a}{15}[/tex]
a = 4
Therefore, the acceleration of the race car is 4m/s²
a mineral has a mas of 53grams. Its volume is 12millileters. What is the
density?
Answer:
636
Explanation:
Answer:
4.45 g/mL
Explanation:
to get density, you simply divide the volume by the mass, so your equation would look like p= 53/12
P being density, which is what you are solving for! Hope this helps!!
on, Inc., publishing as pe
6. Circle the letter before each element that is a gas at room temperature.
a. carbon
c. mercury
d. nitrogen
b. oxygen
How is data recorded in science?
Answer:
Yes
Explanation:
You need data to be able to compare experiments and come up with predictions.
If a train (travelling from Albuquerque to Atlanta) is moving 33.9 meters per second when it accelerates at -2.02 m/s^2 for 1.01 seconds, what is the final velocity
Answer:
The final velocity is 31.86 m/s.
Explanation:
The final velocity can be found using the following equation:
[tex] V_{f} = V_{0} + at [/tex]
Where:
[tex]V_{f}[/tex] is the final velocity =?
[tex]V_{0}[/tex] is the initial velocity = 33.9 m/s
a is the acceleration = -2.02 m/s²
t is the time = 1.01 s
[tex] V_{f} = V_{0} + at = 33.9 m/s + (-2.02 m/s^{2})*1.01 s = 31.86 m/s [/tex]
Therefore, the final velocity is 31.86 m/s.
I hope it helps you!
Un cuerpo de m=0,5 Kg se desplaza horizontalmente con v=4m/s y luego de un lapso de tiempo se mueve con v=20 m/s. ¿cual ha sido la variación de la energÍa cinética?
Responder:
64 JuliosExplicación:
La energía cinética se expresa mediante la fórmula KE = 1 / 2mv² donde;
m es la masa del cuerpo
v es la velocidad del objeto
Dado que el cuerpo se mueve horizontalmente con v = 4 m / sy después de un período de tiempo se mueve con v = 20 m / s, entonces la variación en la velocidad será de 20 m / s - 4 m / s = 16 m / s.
Parámetros dados
masa del objeto m = 0,5 kg
Variación de velocidad = 16 m / s
Variación de la energía cinética = 1/2 * 0,5 * 16²
Variación de la energía cinética = 1/2 * 0,5 * 256
Variación de la energía cinética = 0,5 * 128
Variación de la energía cinética = 64 Julios
What teaching methods help you the most (direct instruction, watching videos, teaching others) and why?
Explanation:
for me its teaching others. I find it really helpful to go over something then recite all the info to my mum or sister after without looking at notes to see how much I could remember