Describe a process in which energy changes forms at least twice. Are there any unwanted forms of energy that are produced during the energy transformations?
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Explanation:
Consider the example of the electric fan. The electrical energy used in the electric fan is greater than the kinetic energy of the moving fan blades.
According to the law of conservation of the energy, the energy is neither created nor destroyed. It always remains same.
The electrical energy used in the electric fan is also used in the producing unwanted sound energy.
The electrical energy in the electric fan is converted into any unwanted forms of energy. Like in producing unwanted sound energy and the heat energy. If the electric fan shakes then some of the electric energy is converted into unwanted kinetic energy.
Here, the electrical energy changes into sound energy, heat energy and kinetic energy.
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1. A teacher challenges.students to study moon phases to determine if what they have learned from the textbook is accurate. How might a student investigate claims made in a textbook that moo. phases occur in a 28-day cycle?
A. observe the phase of the moon each night until a full moon can be seen.
B. Compare the textbook phases to the actual moon phases seen in the night sky each night in 28 days periods over a three month time frame.
C. Compare diagrams of moon phases from the textbook to diagrams of moon phases on-line
D. Observe the moon phases seen in the night sky as often as possible over a six month period.
2. What causes the apperance of the moon change overtime?
A. The orbit of the Earth around the Moon and its distance from the sun.
B.The Moons position relative to the sun and earth as it revolves around sun.
C. the rotation of the moon on its axis
D. The distance of the moon to the sun
thank you
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2. The moon changes in appearances from the perspective of people on earth because it's revolving around the planet and the earth is revolving around the sun, so A. Hoped this helped.
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Answer:
An atom that loses a electron is called a cation and has an overall positive charge.
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The correct answer is C. Velocity is a vector and requires a direction.
Explanation:
In physics both speed and velocity are used to study the motion of a body; however, they are slightly different. In the case of speed, this describes the rate of change in position based on distance and time, because of this, speed is based on a magnitude or quantity. On the other hand, velocity is a vector because it does not only includes a change of position but the direction of motion usually based on a specific location reference.
Considering this, it can be concluded the difference between speed and velocity is that "velocity is a vector and requires a direction" because velocity includes both the distance and time (speed) along with the direction while speed focuses only on time and distance.
The difference between speed and velocity is that C) velocity is a vector and requires a direction
Further explanation
Vector is a quantity that has a value and direction
Vector can be symbolized in the form of directed line segments
while the length of the vector is denoted by | a |
Vectors can be written in the form of sequential pairs which shows their coordinates in the Cartesian plane: a (a₁, a₂)
with length
If the direction of the vector is reversed, we get the vector -a which has the same length but in the opposite direction
Operations on vectors include addition and subtraction. Addition of vector a and vector b can be done in a triangular way where the base point of vector b coincides with the endpoint of vector a
The sum of the two is obtained by pulling the line segment from the base point of the vector a to the endpoint of the vector b which results in a new vector c
So a + b = c
If vector a is added by inverse b (-b) then the sum becomes a + (- b) = a-b
If a vector is multiplied by a scalar number (eg denoted by k) then the new vector becomes k | a |.
If k> 0, the new vector is in the direction of vector a, but if k <0 it will be in the opposite direction
A vector has a direction and a magnitude, while a scalar has only a magnitude.
Examples of scalars are: length, mass, time, speed
Examples of vectors are: force, acceleration, velocity
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the average velocity
resultant velocity
the coin velocity
Keywords: vector, speed, velocity
2.5 m/s2
B.
-2.5 m/s2
C.
0.4 m/s2
D.
-0.4 m/s2 PLZZZ HELP ASAP!
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|acceleration| = (change in speed) / (time for the change)
= (10 m/s - 0) / (4 s)
= (10 / 4) (m/s²)
= 2.5 m/s² .
The direction of the acceleration is west.
Identify the cause of foliation in rocks?
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