How to calculate the force in the process of motion
Second: the same
Third: no increase in kinetic energy of wood block
at 10 p.m. on June 30, 2020, the transaction price of radar currency is 110 yuan / piece
the price of radar currency is similar to the stock. The price changes from time to time, and it is random and irregular, so it is impossible to grasp its changing trend. Radar currency belongs to virtual currency, so we must be cautious in investment. Because it is virtual, it is difficult to guarantee its own value. Once it is not recognized, real currency will become virtual currency
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extended materials:
precautions for virtual currency investment:
1, don't borrow money to invest
first of all, you have to understand that this is a very risky investment. Therefore, please live within your income and avoid borrowing money to invest
2, refuse illegal ICO
3, do not add leverage
leveraged trading, that is to use small amount of funds to stop several times the original amount of investment. That is to say, it is possible to double the capital overnight, or it is possible that the capital will return to zero overnight
It's a long-term plan to invest in virtual currency. Because the market is too unknown, we should do our homework, choose a few coins and throw them there. After a year or even a few years, we will look back and see if there will be bitcoin wonders. Then we will knowthe specific solution depends on the change law of the force
if the relationship between the force F and the displacement f = f (x) is given, the integral calculation can be made by using the kinetic energy theorem
if the relationship between F and time is given, the integral calculation can be made by using the momentum theorem
the force analysis of the object should be done first. When the object moves at a constant speed, the external force on the object is zero. If the air friction is not taken into account, the resistance of general objects is the sliding friction with the ground. At this time, the sliding friction is equal to and opposite to other forces on the object. Then the forces in both directions add up to zero. So we're going to move at a constant speed for zero