An acrobat performs with a swing, as shown in the diagram . Which of these most likely happens as the acrobat moves from Point 1 to Point 2?
A. Potential energy decreased and kinetic energy increases.
B. Potential energy increases and kinetic energy decreases.
C. Both potential and kinetic energy increase.
D. Both potential and kinetic energy decrease.**
Even on a windy day, most plants can remain upright. Which structure plays the greatest role in providing a plant with this type of support?
A. nucleus
B. mitochondrion
C. cell wall**
D. skeleton
Which BEST describes one way igneous rocks form?
A. Sedimentary rocks erode.
B. Sedimentary rocks are compacted.
C. Metamorphic rocks are melted, then cooled.**
D. Metamorphic rocks are deposited and cemented.
Take your time! I just need to know if I am right or wrong! Thanks!
For the first question, about the acrobat's movement, the correct answer is A. Potential energy decreased and kinetic energy increases. To arrive at this answer, we need to understand the concept of potential and kinetic energy.
Potential energy is the energy possessed by an object due to its position or state. In this case, when the acrobat is at Point 1, the swing is at its highest point, which means the acrobat has the maximum potential energy.
Kinetic energy, on the other hand, is the energy possessed by an object due to its motion. As the acrobat moves from Point 1 to Point 2, the swing's height decreases, which indicates that the acrobat's potential energy is decreasing. At the same time, the acrobat's speed increases as they move downwards, which means their kinetic energy is increasing. Therefore, the correct option is A.
For the second question, asking about the structure that provides plants with support, the correct answer is C. cell wall. To arrive at this answer, we should be aware of the different structures in plant cells.
The nucleus is responsible for controlling cell activities, the mitochondrion is the powerhouse of the cell that generates energy, and the skeleton is not a relevant structure in plant cells. However, the cell wall is a major component in plant cells that provides mechanical support and helps maintain the plant's shape and rigidity. As a result, the correct option is C.
Lastly, for the third question concerning the formation of igneous rocks, the correct answer is C. Metamorphic rocks are melted, then cooled. To determine this, we must understand the processes of rock formation.
Sedimentary rocks are formed through the accumulation and compaction of sediments. Metamorphic rocks are created through intense heat and pressure acting on existing rocks. However, igneous rocks are formed when molten magma or lava cools and solidifies. Metamorphic rocks do not directly form igneous rocks; instead, they involve a different process. Therefore, the correct option is C.
So, your answers are correct for the first and third questions, while the correct answer for the second question is C. cell wall.