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Calculate. Work and energy
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Remember what you have studied in this section and answer the questions: How much work is done by a person who moves a piano (which is parallel to the ground) 10 m using a force of 200 N? A person does…
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How to…Find the exact location of places
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Parallels and meridians form an imaginary grid over the surface of the Earth. Any place on the planet can be precisely located by identifying its latitude and longitude. Measuring parallels Each…
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The movements of the Earth and the seasons
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The planet Earth is round, like a ball. We call this shape a sphere. We use imaginary lines to study it. The Earth moves in two ways. It orbits (moves around) the Sun and it rotates on an imaginary line…
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The Earth (I)
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The planet Earth is round, like a ball. We call this shape a sphere. We use imaginary lines to study it. The Earth moves in two ways. It orbits (moves around) the Sun and it rotates on an imaginary line…
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The arm and leg bones
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Arms Our arms are joined to our body by the two bones that form our shoulder: the clavicle and the scapula. The upper arm only has one bone, called the humerus. The forearm has two parallel bones,…
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Select. The mountain ranges surrounding the Meseta
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Match each characteristic with the correct mountain range: It is located to the north of the Meseta. ➝ It separates the Meseta from the Guadalquivir river basin. ➝ It runs parallel to the Bay of…
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Work and energy. Machines
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2.1. Forces do work A force does work on a body when it displaces it (figure 1). This is because it changes its energy. For example, if we apply a force to a moving object, the velocity of this object…
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