A block is hung by a string from the inside roof of a van.Wh

什么都被用了2022-10-04 11:39:542条回答

A block is hung by a string from the inside roof of a van.When the can goes straight ahead at a speed of 28m/s,the block hangs vertically down.But when the van maintains this same speed around an unbanked curve (radius=150m),the block swings toward the outside of the curve.Then the string makes an angle A with the vertical.Find angle A.
大概是一辆车打转,半径是150m,平均速度是28m/s.车上系住的罐子也跟着动,问车子以28m/s行走的时候,罐子的角度是多少?

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凝love假笑 共回答了18个问题 | 采纳率94.4%
这是一个关于向心力的问题,
如果要保持罐子也和车一起运动则需要一向心力,也就是倾斜一个角度α,设物体质量m,向心力F,合力一定在绳子上.
见图
tgα=F/mg
F=mv^2/R代入上式中
tgα=F/mg=V^2/gR=28*28/(150*10)≈0.5227
α=27.5945度
1年前
hewei85071414 共回答了11个问题 | 采纳率
典型的向心力题。
匀速圆周运动的货车,物体的向心力和重力垂直,设物体的质量为m,角度A,关系式为:
tanA=F/mg)
-------------------)=>tanA=v^2/rg=28^2/(150*9.8)≈0.53333=>A=28.072
F=mr^2/r)
1年前

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但他有时也表现得愚蠢.
c++报错:Input string value is too large to fit into the buffer
c++报错:Input string value is too large to fit into the buffer
[DBERR 错误:Input string value is too large to fit into the buffer :
insert into temp_info (c1,c2,c3,c4,c5,c6,c7) values(:c1 ,:c2,:c3,to_date(:c4,'YYYYMMDDHH24MISS' ),:c5,:c6,:c7) :Variable::c7,datatype in operator :CHAR]
数据库中针对c7是这样定义的:
create table temp_info (
c1 NUMBER(18) not null,
c2 NUMBER(5) not null,
c3 VARCHAR2(10) not null,
c4 DATE not null,
c5 VARCHAR2(20) not null,
c6 NUMBER(5) not null,
c7 VARCHAR2(2047)
)
程序插入时:
insert into temp_info (c1,c2,c3,c4,c5,c6,c7) values(:c1,:c2,:c3,to_date(:c4,'YYYYMMDDHH24MISS'
x05x05),:c5,:c6,:c7)
光阳06031年前1
悠游aaaaa 共回答了13个问题 | 采纳率100%
可能是 SQL绑定的变量是超过长度的吧,最后一位一定要是 的 不然就会报这种错
Android开发中menu.add(1,0,0,R.string.reply)里四个参数分别代表什么含义啊
wahw20061年前1
wala0823 共回答了24个问题 | 采纳率95.8%
第一个int类型的group ID参数,代表的是组概念,你可以将几个菜单项归为一组,以便更好的以组的方式管理你的菜单按钮.
第二个int类型的item ID参数,代表的是项目编号.这个参数非常重要,一个item ID对应一个menu中的选项.在后面使用菜单的时候,就靠这个item ID来判断你使用的是哪个选项.
第三个int类型的order ID参数,代表的是菜单项的显示顺序.默认是0,表示菜单的显示顺序就是按照add的显示顺序来显示.
第四个String类型的title参数,表示选项中显示的文字.
英语翻译The index of the character in the string to begin the se
英语翻译
The index of the character in the string to begin the search with,or 0 to start from the beginning.The character at nStart is excluded from the search if nStart is not equal to 0.
这个字符的索引在字符串开始搜索,或者从0开始搜索.如果nStart不等于0,这个字符在nStart是搜索排除的.
爱我的人不爱我1年前1
didongdidong 共回答了14个问题 | 采纳率85.7%
MSDN 的全称是 Microsoft Developer Networkbf这是微软公司面向软件开发者的一种信息服务MSDN 实际上是一个以 Visual Studio 和 Windows 平台为核心整合的开发虚拟社区rt包括技术文档、在线电子教程、网络虚拟实验室、微软产品下载(几乎全部的操作系统、服务器程序、应用程序和开发程序的正式版和测试版,还包括各种驱动程序开发包和软件开发包)、Blog、BBS、MSDN WebCast、与 CMP 合作的 MSDN 杂志等等一系列服务nrv以上答案来自百度百科.说白一点.对我们普通用户来说.MSDN这个词也就是会在windows一个系统发布前会大量的进入我们的视线.比如这次的win8.win8还没有正式发售.但是MSDN会提前放出给一些专业测试人员或者一些大企业提前下载试用.普通用户是没法从MSDN下载的.但是有下载就会有泄漏.所以MSDN可以简单的认为是新系统的提前使用通道吧.
下面的哪个选项是正确的?Class Parent{String name;String nick_name;public
下面的哪个选项是正确的?
Class Parent{
String name;
String nick_name;
public Parent(String s,String t)throws Exception{
name = s;
nick_name = t;
}
public String toString(){
return name;
}
}
public class ex2 extends Parent{
public ex2(String s,String t)throws Exception{
super(s,t);
}
public String toString(){
return name +"and"+nick_name;
}
public static void main(String args[]){
Parent a = new Parent("First","1st");
Parent b = new ex2("Second","2nd");
System.out.println("a is"+a.toString());
System.out.println("b is"+b.toString());
}
}(选择1项)
A) 运行结果为:
a is First and 1nd
b is Second and 2nd
B) 运行结果为:
a is First
b is second
C) 运行结果为:
a is First
b is Second 2nd
D) 编译时出错
AbleYang1年前1
koonhao 共回答了20个问题 | 采纳率95%
D) 编译时出错
Parent a = new Parent("First","1st"); 没有处理异常问题.
[string"302.dat"]:155:bad argumet #1 to'find'(string expecte
[string"302.dat"]:155:bad argumet #1 to'find'(string expected,got nil)@ htt
a664317381年前1
上帝之诚 共回答了22个问题 | 采纳率77.3%
这是迅雷引起的.
XP下C:Documents and SettingsAdministratorLocal SettingsApplication DataThunder Networkcloud_inst
win7下C:用户AdministratorAppDataLocalThunder Networkcloud_inst
根据相应的系统,找到文件夹,删除Thunder Network文件夹即可.
Tie some strips of cloth______the string.A on B to C at D in
Tie some strips of cloth______the string.A on B to C at D in 也帮解释下.
蝴蝶曲线1年前1
20079 共回答了14个问题 | 采纳率92.9%
B
把一些布条拴成线
英语翻译是110 South Lake Ave String Township MI 49456,之前的错了
温柔一十八刀1年前0
共回答了个问题 | 采纳率
use any method to improve the following stringy sentence
treetree3301年前1
梦里镜花 共回答了18个问题 | 采纳率83.3%
用任何方法来改进下列stringy sentence
stringy sentence是专业术语吧,不敢乱翻
1fiying,we,people,kites,there,saw连词成句 2much,there,too,string
1fiying,we,people,kites,there,saw连词成句 2much,there,too,string,is 3I,see,a,with,a,woman
(1)fiying,we,people,kites,there,saw (2)much,there,too,string,is (3)I,see,a,with,a,woman,can,sheep(4)run,please,jump,don't,or连词成句谢谢
临城老叫1年前3
着急有什么用 共回答了15个问题 | 采纳率86.7%
We saw people flying kites there.
There is too much string.
I can see a woman with a sheep.
Please don't run or jump.
一道英文物理题哦A ball of mass m is attached to a string of length L
一道英文物理题哦
A ball of mass m is attached to a string of length L .
It is swung in a vertical circle with enough speed to keep the
string taut throughout the motion. Assume the ball travels
freely in the circle with negligible loss of mechanical energy.
Determine if the following six statements are true or false;
e.g., enter 输入TTFFFF.
i) mvt
2 /L = Tt−mg , where vt and Tt are the speed of the
ball and the tension of the string at the top of the circle.
ii) The speed of the ball at the bottom of the circle is greater
than the speed at the top of the circle.
iii) The tension in the string is less at the top of the circle than
at the bottom of the circle.
iv) The difference between the tensions at the top and at the
bottom of the circle depends on the average speed of the
ball.
v) The acceleration of the ball at the top of the circle is di-
rected ‘down’.
vi) The tension in the string at the top of the circle is always
greater than the weight of the ball.
Assume that m = 0.40 kg and L = 1.65m. What
is the difference in tension, Tb−Tt , between when the ball is
at the bottom and when it is at the top?
heaven19801年前1
耳东ww阿里ww 共回答了15个问题 | 采纳率86.7%
答案的话是FTTFTF
计算题
Tb-Tt=6mg=23.52N
过程需要的话说一声
Two rocks are tied together with a string of
Two rocks are tied together with a string of
negligible mass,and thrown into the air.At a
particular instant,rock 1,which has a mass of
0.1 kg,is moving with velocity v1 = (6,−5,4)
m/s,and rock 2,which has a mass of 0.35 kg,
is moving with velocity v2 = (−7,3,2)m/s.
What is the magnitude of the momentum
of the system of the two rocks?
Answer in units of kg · m/s
东北大饭店1年前3
蓝啡sun 共回答了11个问题 | 采纳率100%
把用一根质量忽略不计的绳子绑住的两块石头抛向空中.在一个特定的距离远处,石头1,质量为0.1kg,速度为(6,-5,4)m/s.石头2,质量0.35kg,速度为(-7,3,2)m/s.这时这两个石头组成的系统的动量是多少?答案用kg.m/s表示
不用我帮你计吧.这么简单
class Person{private String name;private int age;private cha
class Person
{
private String name;
private int age;
private char sex;
Person(String name)
{
this.name=name;
}
Person(String name,int age,char sex)
{
this.name=name;
this.age=age;
this.sex=sex;
}
public void show(){
String str="下面展示姓名和年龄还有性别";
System.out.println(str);
System.out.println("姓名:"+name+"年龄:"+age+"性别:"+sex);
}
}
class Stu extends Person
{
long id;
private String name;
private char sex='M';
public Stu(String name,int age,long id,char sex){
supper(name,age,sex);
this.id=id;
}
}
class Teacher extends Person
{
String course;
private String name;
private char sex='M';
public Teacher(String name,int age,String course,char sex)
{
supper(name,age,sex);
this.course=course;
}
}
public class PersonApp
{
public static void main(String[] args)
{
Person p=new Person("噢噢"+22+'M');
Stu s=new Stu("王强",23,2009,'M');
Teacher t=new Teacher("小强",24,'M');
p.show();
s.show();
t.show();
}
}
草小率1年前1
yangwj666 共回答了14个问题 | 采纳率85.7%
注意关键词是super 不是supper
你有两个地方都是这么写的,改过来就好了
求告诉我错在哪里,public class zhishu {public static void main(String
求告诉我错在哪里,
public class zhishu {
public static void main(String[] args){
for(int i=0;i
白色的青春1年前1
毒王贝贝 共回答了11个问题 | 采纳率100%
你的代码有问题,在里层循环中,明显存在矛盾,循环条件是 j
Dim I As Byte,J As Byte,K As String
Dim I As Byte,J As Byte,K As String
Open App.Path & "WORLD " & Text1.Text & ".nes" For Binary As #1
For I = 1 To 175
Get #1,CLng("&HD66" + I),J
If J >= 10 And J < 190 Then
J = J + 55
K = K & Chr(J)
Else
K = K & Str(J)
End If
Next
Close #1
Text2.Text = K
段氏黄硕1年前1
koye0123 共回答了16个问题 | 采纳率87.5%
好像是把文本1的文字加密后存入文本2
阅读下面的程序,回答问题。public class Person{ String name; public void s
阅读下面的程序,回答问题。
public class Person{
String name;
public void show(){
System.out.print(name);
}
public void show(String s){
System.out.print(s+":"+name;
}
}
public class Student extends Person{}
问题:
(1)类Student和类Person是什么关系?___________
(2)类Person中声明了两个同名的show方法的用法,这种现象在面向对象中称为_____
zidanezhong1年前1
chenqitao 共回答了18个问题 | 采纳率94.4%
1 类Student和类Person是什么关系?___:是继承关系 Student继承Person
2 类Person中声明了两个同名的show方法的用法,这种现象在面向对象中称为_____重载 一个类中 方法名相同 参数不同 是重载
python中,关于list和string的说法,错误的是
python中,关于list和string的说法,错误的是
Alist可以存放任意类型
Blist是一个有序集合,没有固定大小
C用于统计string中字符串长度的函数是string。len()
Dstring具有不可变性,其创建后值不能改变
ykplmm1年前1
Egirl888 共回答了17个问题 | 采纳率94.1%
选 B。 list可以存放任意类型,但不是有序的,否则也不会有sort方法了。len实际上通过__len__来实现的,对string 和list都支持。string、list都可变,python不可变的是tuple
She tied the string (to a tree) and put the wet clothes on i
She tied the string (to a tree) and put the wet clothes on it
括号等于划线部分 对划线部分提问!
— — she — — —and put the wet clothes on it
zzhou0000001年前1
新巴客 共回答了15个问题 | 采纳率73.3%
where;did;tie;the;string
哪位可以帮我检查一下这个句子His six String Quarters is the most importang
哪位可以帮我检查一下这个句子
His six String Quarters is the most importang works in the genre since Beethoven's.
这句话包括语法和大小写等谁可以帮我检查一下有没有错误,若没有错误则帮忙翻译一下,谢谢
important打错了不好意思
bianjie1111年前2
6195593 共回答了19个问题 | 采纳率94.7%
他的第六春天交响曲是继贝多芬时代之后最重要的作品.
没有语法错误的
string怎么造句,麻烦造两个!
宝贝琳驮1年前1
玩勿丧志0101 共回答了15个问题 | 采纳率80%
string[striN]
n.
1、线,带,绳子,[美]鞋带
2、(穿珠、钱等的)串线[绳],串在线上的东西,一串东西,项链
3、一连串,一系列,一串,一行
4、[集合词]一群赛跑的马,马队,牛群,一群
5、(弓,乐器的)弦,[the strings]弦乐器(演奏者)
6、纤维,卷须,(豆荚壳等的)筋,腱
7、根据技巧排列的运动员
8、属于同一公司的人员或机构
9、[pl.][美口](附带)条件,限制
10、[美俚]谎话
11、【台球】得分数,计分器
12、【建】束带层,短梯基
13、特约记者所投之稿的剪裁
vt.
(strung [strQN])
1、(用绳等)缚,扎; 挂,(用线)穿,串起,使排成一列
2、上弦于(弓,乐器上),调弦
3、抽去(豆荚的)筋
4、伸展,拉直
5、使紧张,使作好准备; 使兴奋,使敏感(up)
6、[美口]戏弄,愚弄,欺骗(along)
vi.
1、排成一串; 蜿蜒排成行,列成一行前进
2、[美俚]欺骗,撒谎,戏弄
造句:(1)He made the second string on the football team.
他只是足球队的候补队员.
(2)You're always harping on the samestring.
你总是老调重弹.
(3)She is stringing the beads.
她在串珠子.
(4)These houses were strung along the thoroughfare.
这些房子沿着大街排成一行.
请问以下句子哪句正确?为什么?①I pulled the string tightly②I pulled the str
请问以下句子哪句正确?为什么?
①I pulled the string tightly
②I pulled the string tight
挟持天使1年前1
悠游的蓝 共回答了17个问题 | 采纳率100%
第二个是正确的,第一个是错的.因为tight的副词形式是它本身,修饰动词时时不用加ly.
英语翻译这个词组出自某国外原产化妆品的说明,原句是is an alternative to drying astring
英语翻译
这个词组出自某国外原产化妆品的说明,原句是is an alternative to drying astringents.
96302581年前1
avbvcv 共回答了16个问题 | 采纳率81.3%
astrigent的意思是收缩毛孔的
这里作名词,意思是那些用来收缩毛孔的东西,护肤品里来说,一般是指收敛化妆水,那种化妆水一般含有酒精或是金缕梅提取物用来帮助收缩毛孔,所以会伴随着产生干燥皮肤的现象,也就是drying,使干燥
这句话的意思是,你这个产品是一个可以用来代替那些使皮肤干燥的收敛物的产品
简单来说,就是这个产品可以收敛毛孔但是不会干燥皮肤
Tie the shapes with some string.
红云蓝天1年前1
彻夜uu 共回答了17个问题 | 采纳率94.1%
把那些模型用绳子捆起来.