Answer: the correct answer is option d.
Explanation:
Validity is concerned with the extent to which differences in scores reflect true differences in the characteristic.
Answer:
d. concerned with the extent to which differences in scores reflect true differences in the characteristic.
Explanation:
Validity is the level of accuracy of a measurement under research or test. A measurement is said to be valid if its result is closely related to real world values. Validity in research shows how sound one's research is. In data it means getting a true representation of the data a researcher is claiming to measure. To measure validity, the measurement must have internal consistency and good test-retest reliability.
Types of validity.
Validity can be content, construct, face and criterion.
(1) Kinetic energy decreases and total mechanical energy increases.
(2) Kinetic energy decreases and total mechanical energy remains the same.
(3) Kinetic energy remains the same and total mechanical energy increases.
(4) Kinetic energy remains the same and total mechanical energy remains the same.
Taking into account the definition of kinetic, potencial and mechanical energy, kinetic energy decreases and total mechanical energy remains the same.
Kinetic energy is a form of energy. It is defined as the energy associated with bodies that are in motion and this energy depends on the mass and speed of the body.
Kinetic energy is defined as the amount of work necessary to accelerate a body of a given mass and at rest, until it reaches a given speed. Once this point is reached, the amount of accumulated kinetic energy will remain the same unless there is a change in speed or the body returns to its state of rest by applying a force.
On the other hand, potential energy is the energy that measures the ability of a system to perform work based on its position. In other words, this is the energy that a body has at a certain height above the ground.
Gravitational potential energy is the energy associated with the gravitational force. This will depend on the relative height of an object to some reference point, the mass, and the force of gravity.
Finally, mechanical energy is that which a body or a system obtains as a result of the speed of its movement or its specific position, and which is capable of producing mechanical work. Then:
Potential energy + kinetic energy = total mechanical energy
The principle of conservation of mechanical energy indicates that the mechanical energy of a body remains constant when all the forces acting on it are conservative (a force is conservative when the work it does on a body depends only on the initial and final points and not the path taken to get from one to the other.)
Therefore, if the potential energy decreases, the kinetic energy will increase. In the same way, if the kinetics decreases, the potential energy will increase.
The principle of conservation of mechanical energy can be applied in this case. When a block is pulled at constant speed up an incline, the potential energy increases because it increases the height.
Then, if by the principle mentioned above, the total mechanical energy remains the same, the kinetic energy decreases.
In summary, the correct answer is option (2)Kinetic energy decreases and total mechanical energy remains the same.
Learn more about mechanical energy:
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Answer:
(2) Kinetic energy remains the same and total mechanical energy increases.
Explanation:
A body has kinetic energy due to its speed. A body has potential energy due its position or configuration. The sum of kinetic energy and potential energy is known as mechanical energy.
As the block is pulled up at constant speed, the kinetic energy remains the same. With increase in the height, the potential energy of the body increases. Thus, due to increase in potential energy, there is increase in the total mechanical energy.
The rate of the reaction is approximately 0.248 grams per second.
The rate of a reaction is determined by the change in the concentration of reactants or products with respect to time. In this case, the mass of a reactant decreases by 58g over a time interval of 233 seconds. To calculate the rate, we can divide the change in mass by the time elapsed:
Rate = Change in mass / Time
Rate = 58g / 233s ≈ 0.248 g/s
This value represents the rate at which the reactant is being consumed during the reaction. It's important to note that the units of the rate are consistent with the units of the given data (grams and seconds). This rate provides insight into how quickly the reaction is progressing in terms of reactant consumption.
To know more about reactant consumption, here
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I've just been doing that now, this might be a bit late but the answere is 0.25g/s
B. Air
C. Water
D. Steel
Answer:
steel i think
Explanation: