![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
How many tons of tire oil can a 3 m long and 1.2 m wide rectangle hold? The density is 0.5
3 * 1.5 * 1.2 * 0.89 = 4.806 tons
A classroom is 6 m long and 5 m wide, and the air density is 1.29 kg / m3, so the air quality in the classroom is about 5_ ．
Mass = density * Volume
=6*5*3*1.29
=116.1
The monument to the people's Heroes is 40m high and made of 413 granite stones. The stone in the center of the monument is 15m long, 3M wide and 1m thick
What is the quality of the stone? The density of granite is 2.6g/cm
The stone is 15.3 meters long, 3.55 meters wide, 2.1 meters thick and weighs 300 tons. After the first processing, the top of the stone is flattened and the weight is reduced to 280 tons. On the 10th, the large stone is transported from the mining site to the mountain farm (the flat part of the hillside) for 60 meters. The next afternoon, the stone is put down the mountain. After turning, turning over and the second processing, the stone is 14.7 meters long, 2.92 meters wide, 1.0 meters thick in the middle, 0.8 meters thick on both sides and weighs 102 tons
RELATED INFORMATIONS
- 1. A granite stone with school motto has a mass of 3.18 × 104 & nbsp; kg and a density of 2.65 × 103 & nbsp; The density of brick is known to be 2.05 × 103kg / m3, and the density of cement mortar in the base brick joint is the same as that of brick (G is 10N / kg) (1) The volume of granite stone; (2) the pressure of stone on base; (3) the ratio of stone to base and base to ground
- 2. Is giraffe's heart very good? Why is its blood pressure so high Please give a scientific answer
- 3. Is a giraffe the tallest animal on land, or an elephant?
- 4. Giraffe is the tallest animal on the earth at present, so its blood pressure is also the highest among the animals. The average height of an adult giraffe can reach 4.3m, its mass can reach 2T, and the landing area of one sole of a giraffe is 250cm2? (2) If the blood density of a giraffe is 1.05 × 103kg / m3, when its heart contracts, it is necessary to press the blood to the head 3M higher than the heart, then at least how much pressure should be produced when the giraffe's heart contracts? (systolic pressure refers to the pressure produced when the heart contracts. Atmospheric pressure is not taken into account in calculation. In this problem, G is taken as 10N / kg.)
- 5. Which one is more dense, granite or basalt?
- 6. To the south of the park, a 15 meter long, 24 centimeter wide and 3 meter high wall will be built. If 525 bricks are used per cubic meter, how many bricks are used in this wall?
- 7. A stone tablet, 50 m long, 20 cm wide, 3 m high and 75 t in mass, is of high density____ Kg / m3? RT
- 8. If a stone tablet is 50cm in length, 20cm in width and 0.7T in weight, what is its density kg / M? If 1 / 4 of it is removed, what is the density of the remaining part kg / M It's urgent,
- 9. On the physical problems of measuring the density of eggs Using spring dynamometer, beaker, water and thin wire, a scheme of measuring egg density is designed, and the experimental steps and expression of egg density are written Can you make it clear? What is the specific gravity?
- 10. How to measure the density of eggs with beaker, water, flat bottom test tube, fine sand, scale and salt
- 11. A rectangular granite is 10 meters high, 3 meters wide and 2 meters thick, with a density of 2.5 x 10 cubic kilogram per cubic meter. The maximum bearing capacity on the ground is
- 12. As shown in the figure, PQ is a thin metal sheet in a uniform magnetic field, and its plane is parallel to the direction of the magnetic field. A charged particle shoots out from a certain point at a velocity V perpendicular to PQ, and the kinetic energy is e. the trajectory of the charged particle after shooting is shown in the figure. The ratio of its trajectory radius on both sides of the metal sheet is 10:9. If the resistance and electric quantity of the particle are constant in the process of passing through the plate, it can be seen as follows, Then () A. Charged particles must be positively charged. B. the velocity of charged particles decreases by 1102emc every time they pass through the metal sheet. The kinetic energy of charged particles decreases by 0.19ed every time they pass through the metal sheet. The charged particles are trapped in the metal sheet after they pass through five times
- 13. As shown in the figure, the uniform electric field in a certain space is vertically downward, the uniform magnetic field is vertically inward, and a metal bar AB falls freely from high h, then () A. A end first landing B. B end first landing C. both ends simultaneously landing D. the above statements are not correct
- 14. As shown in figure a, the smooth parallel guide rails Mn and PQ are placed horizontally without resistance. The distance between the two guide rails is d = 10cm. The conductor rods AB and CD are placed on the guide rails and perpendicular to the guide rails. The resistance of each rod between the guide rails is r = 1.0 Ω. The two rods are tied with insulated wire with length of L = 20cm. When the whole device is in a uniform magnetic field. T = 0, the magnetic field direction is vertical and downward, and the wire is just in the ungrounded position After that, the change of magnetic induction intensity B with time t is shown in Fig. B. the influence of the induced current magnetic field is not taken into account. The whole process of the wire is not broken
- 15. As shown in the figure, in a uniform magnetic field, the resistance of two parallel metal guide rails Mn and PQ is ignored, AB and CD are two metal slide rods As shown in the figure, in a uniform magnetic field, the resistance of two parallel metal guide rails Mn and PQ is not included, AB and CD are two metal slide rods, and the resistance rabf2 and UAB
- 16. As shown in Figure 1, two long enough straight metal guides Mn and PQ are placed in parallel. The distance between the two guides is l0, m and P, and there is a resistance of R indirectly. A uniform straight metal rod AB with mass of M is placed on the two guides and perpendicular to the guide rail. The whole device is in a uniform magnetic field with magnetic induction intensity of B, and the magnetic field direction is perpendicular to the inclined plane downward. The resistance of the guide rail and the metal rod can be ignored Let the AB rod slide down along the guide rail from rest, and the guide rail and the metal rod have good contact, regardless of the friction between them. (1) the device seen from B to a direction is shown in Figure 2, in which the force diagram of AB rod at a certain time in the process of sliding is drawn; (2) when the speed of AB rod is V, the current and acceleration of AB rod at this time are calculated; (3) when the speed of AB rod is V, the force diagram of AB rod is obtained In the process of sliding, the maximum velocity can be reached by ab bar
- 17. How to measure the diameter of 100cm wire
- 18. A wire with a length of 50cm is tightly wound on the pencil rod for 30 turns, and the width of 30 turns is measured with a scale, then the diameter of the wire is () mm (2) μ M
- 19. A piece of wire is wound on the pencil for 20 turns, and the width of 20 turns is 20 mm measured with a scale. The diameter of the wire is? Mm I'm in a hurry
- 20. In order to measure the diameter of the thin copper wire, a student arranged the thin copper wire tightly on the pencil for 30 turns, as shown in the figure. From the figure, we can see that the length of the coil is______ Cm, the diameter of copper wire is______ cm．