physic物理问题英文53.john pushes a loaded wheelbarrow,which is ini
brwefwf352022-10-04 11:39:543条回答
physic物理问题英文5
3.john pushes a loaded wheelbarrow,which is initially at rest,with a constant horizontal force of 10 newtons,the mass of the wheelbarrow is 15kg.Neglect friction forces.
A.what is the constant acceleration of the wheelbarrow?
B.if John pushes the wheelbarrow for 3 seconds,what distance does the wheelbarrow cover during this time?
C.What is the speed of the wheelbarrow after 3 seconds?
4.Suzie(50kg) is roller-blading down the sidewalk going 20 miles per hour.She notices a group of workers down the walkway who have unexpectedly blocked her path,and she makes a quick stop in 0.5 seconds.
A.what is Suzie’s average acceleration in meters per second?
B.what force in newtons was exerted to stop Suzie?
C.where did this force come from?
3.john pushes a loaded wheelbarrow,which is initially at rest,with a constant horizontal force of 10 newtons,the mass of the wheelbarrow is 15kg.Neglect friction forces.
A.what is the constant acceleration of the wheelbarrow?
B.if John pushes the wheelbarrow for 3 seconds,what distance does the wheelbarrow cover during this time?
C.What is the speed of the wheelbarrow after 3 seconds?
4.Suzie(50kg) is roller-blading down the sidewalk going 20 miles per hour.She notices a group of workers down the walkway who have unexpectedly blocked her path,and she makes a quick stop in 0.5 seconds.
A.what is Suzie’s average acceleration in meters per second?
B.what force in newtons was exerted to stop Suzie?
C.where did this force come from?
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tongbo666 共回答了16个问题 |采纳率100%- 3.以水平方向 10N 的力推一初速度为零,质量为 15千克 的载货手推车.（忽略阻力）
A.求手推车的加速度
a=F/m
B.如果约翰推手推车持续3秒,那么这段时间里手推车走过的路程为多少?
S=1/2 at^2
C.3秒后手推车速度为多少?
V=at
4.苏西以每小时20英里（1英里=1600米）的时速顺着人行道溜冰.她忽然发现前方有一群工人阻挡住了她的去路,于是她急刹用了0.5秒停了下来.
A.苏西的平均加速度为多少?
a=v/t
B.使苏西停下来的外力有多大?
F=ma
C.这个外力是怎么产生的?
Friction Force(摩擦力) - 1年前
- dafei868 共回答了14个问题
|采纳率 - 3.john独轮车推加载，这是最初的休息，以不断横向力的10牛顿，大众的独轮车是15千克。忽视摩擦力。
A.什么是不断加快的独轮车？
b.如果约翰推独轮车3秒，没有什么距离的独轮车覆盖在这段时间？
C.什么是速度的独轮车后3秒？
4 。苏丝（五○公斤）是滚轴旱冰下跌人行道去20英里每小时。她告示一群工人降低行人谁也阻挡她意外的道路，她提出了快速停止在0.5秒... - 1年前
- 没钱go 共回答了5个问题
|采纳率 - 4 。苏丝（50公斤）是滚轴旱冰下跌人行道去20英里每小时。她告示一群工人降低行人谁也阻挡她意外的道路，她提出了快速停止在0.5秒内。
A.什么是苏丝的平均加速每秒？ - 1年前
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n.药
vt 治疗(给...服药)
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认为医生应该能医治任何疾病的观念是错误的.
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