Fysik - Kraft Och Tryck

Isaac Newton is credited with discovering the concept of gravity in the 1660s. According to the popular story, Newton was sitting under an apple tree when an apple fell on his head, leading him to ponder why the apple fell straight down instead of sideways or upwards. This event supposedly sparked his curiosity and eventually led to his formulation of the laws of gravity. While the story may be slightly exaggerated, Newton's work on gravity and his laws of motion revolutionized the field of physics.

The statement "The unit for pressure is km/h" is false. The correct unit for pressure is typically expressed in pascals (Pa) or other units such as pounds per square inch (psi) or atmospheres (atm). Kilometers per hour (km/h) is a unit used to measure speed or velocity, not pressure.

If the center of gravity of an object is outside its base of support, the object will become unstable and topple over. This is because the center of gravity is the point where the weight of the object is concentrated. When the center of gravity is not within the base of support, there is an imbalance of forces, causing the object to lose its stability and fall. Therefore, the statement "Om tyngdpunkten hamnar utanför ett föremåls stödyta kommer föremålet att välta" (If the center of gravity is outside an object's base of support, the object will topple over) is true.

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The statement "Detta är ett kommunicerande kärl" is true. This means that the object being referred to is a communicating vessel, which is a type of container or system where the liquid inside can flow freely between different compartments.

A kommunikerande kärl, or communicating vessel, is a system of interconnected containers or tubes where the water level is the same in all parts of the system because the pressure exerted by the water is equal in all directions. Since the vessels are connected at the bottom, the water will distribute itself equally among them, resulting in the same water level in each part.

The statement is true because both newton per square meter (N/) and pascal (Pa) are units of pressure. Newton per square meter is the SI unit for pressure, while pascal is a derived unit that is equal to one newton per square meter. Therefore, both units can be used interchangeably to measure pressure.

Arkimedes kom på att den mängd vatten som trängs undan är det samma som vattnets lyftkraft genom att bada i ett badkar och se hur vattennivån höjde sig när han klev i.

The correct answer is that the ball has a lower density than water and displaces a large amount of water, causing the water to lift it up with its buoyant force.

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Massa är samma sak som vikt eftersom massa är en mätning av den mängd materia som ett objekt innehåller, medan vikt är kraften som dras på ett objekt på grund av gravitationen. I vardagligt tal används ofta termerna massa och vikt omväxlande, men i vetenskapliga sammanhang skiljer man på dem.

Dragningskraft is the Swedish term for gravitational force, which is the force that attracts objects towards each other due to their mass. Therefore, the correct answer is "tyngdkraft" which translates to "gravitational force" in English.

The weight of an object is equal to its mass multiplied by the acceleration due to gravity. In this case, the woman has a mass of 68 kg. Therefore, her weight would be 68 kg multiplied by the acceleration due to gravity, which is approximately 9.8 m/s^2. This gives us a weight of approximately 666.4 N. However, since the answer options provided are 680 N, 680, and 680 n, none of them accurately represent the correct weight.