Tasks on the movement seem difficult only at first sight. To find, for example, the speed of the movement of the vessel against the current, it is enough to present the situation stated in a task. Take the child in a small travel down the river, and the school student will learn ""to click such problems as nutlets"".
It is required to you
- Calculator, handle.
Instruction
1. According to the modern encyclopedia (dic.academic.ru), speed is the characteristic of progress of a point (body) in number equal at uniform motion to the relation of the passable way of S to interval time of t, i.e. V = S/t.
2. To find the speed of the movement of any vessels against of a current, it is necessary to know own vessel speed and speed of a current. Own speed is a speed of the movement of the vessel in still water, for example, in the lake. Let's designate it - the V sobstvo. Speed of a current is determined by on what distance the river carries a subject per unit of time. Let's designate it - the V leak.
3. To find the speed of the movement of the vessel against the current (V Ave. a leak.), it is necessary to subtract current speed from own vessel speed. So, received a formula: V Ave. leak. = the V sobstvo. - The V leak.
4. Let's find the speed of the movement of the vessel against the current of the river if it is known that own vessel speed is equal to 15.4 km/h, and watercourse speed - 3.2 km/h. 15.4 - 3.2 = 12.2 (km/h) - the speed of the movement of the vessel against the current the rivers.
5. In tasks on the movement often it is required to transfer km/h to m/s. That to make it, it is necessary to remember that 1 km = 1000 m, 1 h = 3600 pages. Therefore, x km/h = x * 1000 m / 3600 with = x / 3.6 m/s. So, to transfer km/h to m/s it is necessary to divide into 3.6. For example, 72 km/h = 72:3.6 = 20 m/s. To transfer m/s to km/h it is necessary to increase by 3.6. For example, 30 m/s = 30 * 3.6 = 108 km/h.
6. Let's transfer also km/h to m/min. For this purpose we will remember that 1 km = 1000 m, 1 h = 60 min. Means, x km/h = 1000 m / 60 min. = x / 0.06 m/min. Therefore, to transfer km/h to m/min. it is necessary to divide into 0.06. For example, 12 km/h = 200 m/min. To transfer m/min. in km/h it is necessary to increase by 0.06. For example, 250 m/min. = 15 km/h