The density is 0.6 × 103 kg / m3, and the volume is 100 cm 3. The bottom of the container is tied with a rope, as shown in the figure As shown in Fig. 4, if the water level is just level with the surface of the block when water is injected into the container, the tension on the rope is 0______ Cattle

The density is 0.6 × 103 kg / m3, and the volume is 100 cm 3. The bottom of the container is tied with a rope, as shown in the figure As shown in Fig. 4, if the water level is just level with the surface of the block when water is injected into the container, the tension on the rope is 0______ Cattle

A thin-walled cylindrical container with a weight of 2 N and a bottom area of 200 cm square contains 20 cm deep water. If a piece of wood with a weight of 5.88 N and a density of 0.6 * 103 kg / m3 is placed in the water
After putting in the wood, the pressure of the container on the table increases

If the water is full, the water will overflow after the wood block enters, because the density of the wood block is less than that of the water, so the wood block floats, f floating = g row = g wood, that is: the total weight of the container remains unchanged, so the pressure of the table top does not increase at this time; if it is not full, and there is no water overflow after the wood block enters: at this time, the increased pressure is equal to the weight of the wood block, and the increased pressure is

A, B and C are 300 meters apart in turn (as shown in the figure). A, B and C walk 100 meters, 90 meters and 85 meters per minute in turn. If a, B and C start at the same time, they will pass by______ For the first time, the distance between a and B, C is equal

Suppose that after X minutes, the distance between a and B and C is equal for the first time, we can get: 300 × 2 - (100-85) x = (100-90) x-300, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 25X = 900, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; &Answer: after 36 minutes, the distance between a and B, C is equal for the first time