The problem of the over under balls landing at the same time betting .

Unfortunately, I can only tell you that your choice is wrong, because air and water are different mediums, and the resistance of air to the size of the two balls is so small that it can be ignored, so the size of the ball can land at the same time, if there is a professional instrument to measure, it should be said that the size of the ball is not at the same time, but the difference between the size and the ball is too small, so small that it is ignored, because the air resistance is too small and too small, but the resistance of water is much greater than the air, and the obstruction surface of the size ball is not the same, There are two other influencing factors in the water, buoyancy influence, those who know physics know that the size of buoyancy is related to the volume, the volume of the size of the ball is of course different, then it is easy to conclude that the ball of different sizes will definitely not land at the same time in the water, but if you say that the difference between the size of the two balls is not big, then the gap between the landing will not be very large, and the impact of buoyancy and drag will not be large, or it can also be small enough to ignore, what I stated above is just to say, When the difference in the size of the two goals is obvious. Hopefully, this answer will satisfy you.

In the case of negligible resistance, the large and small balls in the air can land at the same time, and the resistance can not be ignored at the same time, now it depends on what is the specific gravity of buoyancy relative to gravity, if it is only a small part (generally speaking) it should also be ignored, after all, it is an iron ball, and the density is very large.

If you have not learned to find a derivative, it is not recommended to directly do the problem of using derivatives to find extremums.

Safe bai, I've always used my phone (

The English screen prompts that no bootable operating system can be found. Since it is a problem after replacing the power supply, it is more likely that the hard disk data cable and the power cable are not connected properly, you check it. If there is no problem with the wiring, this prompt still appears, that is, the operating system on the hard disk is damaged.

If the computer has been backed up or is a genuine system, you can try to restore the factory system; Otherwise, you can use the system disk to boot the computer and reinstall the operating system, which can solve the problem.

The more you wear the silver bracelet, the rougher it becomes, which may be the reason why you usually don't pay attention to protection and are scratched. As for the discoloration, that's normal. You can go to their after-sales service to clean it. Under normal circumstances, there will be no problems if you buy it through regular channels.

Young clothes are more beautiful to wear, and women should not be inferior at any time.

1. Enter anything you want to find in the built-in Cortana of the system, here we search for [Bluetooth], and you will see [Bluetooth Settings], select and click on it; 2. After opening, you will find that Bluetooth is on by default, of course, if your system is turned off, please click to the right position with the mouse, after turning on Bluetooth, the computer will automatically search for Bluetooth devices in the area, which also shows our Bluetooth device model; 3. Find your Bluetooth device, there will be a [Pairing] option, and click it; 4. Next, the computer will automatically pair with the Bluetooth device. If the pairing is successful, it will be displayed here in the Bluetooth device.