What is the density of granite?

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• 1. There is a granite monument with a height of 38m, a length of 15m and a thickness of 3M. In order to know its gravity, a small sample of granite is taken and its mass is 39.2g measured by a balance. It is tied with a thin line and immersed in a measuring cylinder filled with 70ml water. The water surface rises to the position where the scale is 84ml. The gravity of the monument is calculated
• 2. If a stone tablet is 50cm in length, 20cm in width and 0.75T in mass, its density is () kg / M cubic?
• 3. The mass of a piece of granite is 6.5 tons, and its volume is the cubic of 2.3 meters
• 4. A granite stone with school motto has a mass of 31.8t and a density of 2.65 times 10 cubic kilogram per cubic meter
• 5. Measuring egg density Please use the spring dynamometer beaker water thin line to design a program to measure the density of eggs. Write the experimental steps Note: apply the knowledge of mass density instead of force Please use spring dynamometer beaker and water thin line measuring cylinder to design a scheme for measuring egg density. Write out the experimental steps Note: apply the knowledge of mass density instead of force
• 6. Measure the density of eggs with a densimeter, beaker, water and salt
• 7. How to measure the density of eggs at home? If you really can't think of it, you can do one of the following: 1: How to wash clothes with the least water and clean? 2: Explore what color has strong heat absorption ability? Thank you!
• 8. Please use spring dynamometer, beaker, water and thin wire to design a scheme for measuring the density of eggs Find the experimental steps and density expression
• 9. How to measure the density of eggs A cup, enough water and salt, a glass rod, a dropper, a densitometer, design an experiment to measure the density of an egg
• 10. What is the density of eggs
• 11. Giraffe is the tallest animal with an average height of 4.3 meters and a blood density of about 1.05 × 103kg / m3. When the giraffe's heart contracts and presses the blood into the brain which is 3 meters higher than the heart, the pressure is at least 10%______ Pa．
• 12. The mass of a granite stone with school motto is 31.8t and the density is 2.65 × 103kg / m3. It is erected on a horizontal base with a length of 4m, a width of 2M and a height of 0.5m (as shown in the figure). The contact area between the stone and the base is 2.12m2. The density of the known brick is 2.05 × 103kg / m3. The density of the cement mortar in the base brick joint is the same as that of the brick. (G is 10N / kg) Volume; (2) the pressure of stone to base; (3) the ratio of stone to base and base to ground
• 13. The height, width and thickness of a rectangular flower rock monument are 10m, 3M and 2m respectively, the Rou is 2.5 × 103 times, and the maximum pressure on the ground is 1.2 × 103 times. In order to make the ground bear the monument, the height of the monument is 1m, the Rou is 2 × 103 times, so that it can be put on the rectangular cornerstone? 2 if the monument stands directly on the ground, the pressure on the ground is?
• 14. The height, width and thickness of a rectangular flower jar monument are 10m, 3M and 2m respectively, and the density is 2500kg / M & sup3; the ground can bear the maximum pressure of 150000pa. In order to make the ground can bear the monument, the monument is erected on the rectangular cornerstone with the height of 1m and the density of 2000kg / M & sup3 (1) What is the quality of the monument? (2) If the monument stands directly on the ground, what is its pressure on the ground? (3) what is the minimum bottom area of the cornerstone?
• 15. This granite is 14.7 meters long, 2.4 meters wide and 1 meter thick. What's its mass? The density of granite is 2.8 * 10 cubic kg / M cubic
• 16. There is a monument with a mass of 10t standing on the foundation stone of a cuboid, as shown in the figure. The density of the foundation stone is 2 × 103kg / m3, and the design height is 1m. If the maximum pressure on the ground at the place where the monument is erected is 1.4 × 105Pa, what is the bottom area of the foundation stone? (take g = 1On / kg)
• 17. There is a monument. The total mass of the upper stone is 100t, and the height of the lower cornerstone is 1m. If the density of the cornerstone is 2 * 10 cubic kg / m3, and if the ground can bear the pressure of 68600, what is the bottom area of the cornerstone at least Another question: a piece of wood has a density of 400kg / m3 and a volume of 0.000056 m3. Put a frog on the block and the block floats on the water. The upper surface of the block is just level with the water surface. How much does the frog weigh?
• 18. As shown in the figure, the metal bar PQ moves to the left () A. When the rod is moving at a constant speed, the potential difference between a and B is not equal to zero. B. when the rod is accelerating, the current direction in coil N changes from a through n to B. C. when the rod is accelerating at a constant speed, there may be C → D current in bulb D. when the rod is decelerating, there may not be C → D current in bulb L
• 19. As shown in the figure, the smooth U-shaped metal frame is still on a horizontal plane in a vertical downward uniform magnetic field. Now the AB rod suddenly obtains an initial velocity V and moves to the right A. B. the current in the circuit decreases uniformly. C. the potential of point a is lower than that of point B. D. the U-shaped frame moves to the right
• 20. As shown in the figure, the distance between two sufficiently long parallel smooth metal guide rails Mn and PQ is, the angle between the guide rail plane and the horizontal plane = 30 °, the resistance of the guide rail is not included, and the magnetic resistance is not included The uniform magnetic field with the strength of B is perpendicular to the plane of the guide rail and upward. The metal plate AB with the length of D is perpendicular to Mn PQ and placed on the guide rail, and always has good contact with the guide rail. The mass of the metal bar is m, and the resistance r = R. a bulb is connected to the upper end of the guide rail of the two metal bars, and the resistance RL = R of the bulb and the acceleration of gravity is g, A constant force of F = mg is applied to the metal rod in the direction perpendicular to the rod and parallel to the plane of the guide rail to make the metal rod move from static state. When the metal rod reaches the maximum speed, the bulb can just reach its rated power (1) The maximum velocity VM that metal bar can reach (2) Rated power of bulb pl (3) Acceleration a when the metal bar reaches half of the maximum speed (4) If the maximum sliding distance of the metal bar is l, calculate the electric heat QR generated on the metal bar during the process of the metal bar sliding up 4L from static state