不知道怎么水字数,就来点我这边的考试内容吧!
好东西要和大家分享
化学:The random error is the fluctuating part of the overall error that varies from measurement to measurement. Normally, the random error is defined as the deviation of the total error from itsmeanvalue.
Definitions of system error.an instruction that is either not recognized by an operating system or is in violationof the procedural rules. type of: command, instruction, program line, statement. (computer science) a line of code written as part of a computer program
物理:A BMX rider is travelling through a dip on a track where the dip is part of a vertical circle of
radius 5.0 m. At the bottom of this dip, the rider experiences a reaction force from the
ground of 1075 N. Calculate the speed of the rider through this part of the track. The
10751
combined mass of the rider and bicycle is 75 kg. (Note: ignore the effects of friction)
science teacher was twirling a ball on a string as a demonstration of horizontal circular
motion. One of the students noticed that the string always dipped at an angle below the
horizontal. Let 6 be the angle the string makes with the horizontal. Assume the string has
negligible mass.
(a)
With reference to specific forces, explain why the string always makes an angle