Một vật bằng nhôm khi nhúng chìm trong nước thì số chỉ của lực kế là 40N. Hỏi khi vật ở ngoài không khí thì số chỉ của lực kế bằng bao nhiêu. Cho trọng lượng riêng của nước là 10000N/m3, trọng lượng riêng của nhôm là 27000N/m3

(1 point) match the differential equations and their vector valued function solutions. you may wish to multiply at least one solution out fully, to make sure that you know how to do it. you can get the other answers quickly by process of elimination and just multiply out one row element.

What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?

The path of a satellite orbiting the earth causes it to pass directly over two tracking stations a and b, which are 51 miles apart. when the satellite is on one side of the two stations, the angles of elevation at a and b are measured to be 87 degrees and 84 degrees, respectively. (a) how far is the satellite from station a? (b) how high is the satellite above the ground?