英语翻译1 Which is a vector quantity?(1) electric charge(2) electric field strength(3) electric potential difference(4) electric resistance5 A machine launches a tennis ball at an angle of25° above the horizontal at a speed of 14 metersper second.The ball returns to level ground.Which combination of changes must produce anincrease in time of flight of a second launch?(1) decrease the launch angle and decrease theball’s initial speed(2) decrease the launch
英语翻译
1 Which is a vector quantity?
(1) electric charge
(2) electric field strength
(3) electric potential difference
(4) electric resistance
5 A machine launches a tennis ball at an angle of
25° above the horizontal at a speed of 14 meters
per second.The ball returns to level ground.
Which combination of changes must produce an
increase in time of flight of a second launch?
(1) decrease the launch angle and decrease the
ball’s initial speed
(2) decrease the launch angle and increase the
ball’s initial speed
(3) increase the launch angle and decrease the
ball’s initial speed
(4) increase the launch angle and increase the
ball’s initial speed
11 A 0.15-kilogram baseball moving at 20.meters per
second is stopped by a catcher in 0.010 second.
The average force stopping the ball is
(1) 3.0 × 10–2 N (3) 3.0 × 101 N
(2) 3.0 × 100 N (4) 3.0 × 102 N
12 A spring with a spring constant of 80.newtons
per meter is displaced 0.30 meter from its
equilibrium position.The potential energy
stored in the spring is
(1) 3.6 J (3) 12 J
(2) 7.2 J (4) 24 J
16 Which statement best describes a proton that is
being accelerated?
(1) It produces electromagnetic radiation.
(2) The magnitude of its charge increases.
(3) It absorbs a neutron to become an electron.
(4) It is attracted to other protons.
18 If the distance separating an electron and a
proton is halved,the magnitude of the
electrostatic force between these charged
particles will be
(1) unchanged (3) quartered
(2) doubled (4) quadrupled
21,If the amplitude of a wave traveling in a rope is
doubled,the speed of the wave in the rope will
(1) decrease
(2) increase
(3) remain the same
25 As a transverse wave travels through a medium,
the individual particles of the medium move
(1) perpendicular to the direction of wave travel
(2) parallel to the direction of wave travel
(3) in circles
(4) in ellipses
哇。。好多。。。我帮帮你把。。不过我是字典看的哦。好多专有名词哦。。
1)下列哪个是向量
1）电荷
2）电的磁场强度
3）电势差／电位差
4）电阻／ 就是对电有抵抗力
5） 一个机器在地平线上以25度的角度和14公尺／每秒的速度 扔了一 个网球。 球过了一会儿回到地上。Which combination of changes must produce an increase in time of flight of a second launch? 这句看不是很懂。 好像是“哪些改变联合一起可以让时间增多把。。
1) 扔球时减少角度并且减少扔球的速度
2) 扔球时减少角度并且增加扔球的速度
3) 扔球时增加角度并且减少扔球的速度
4) 扔球时增加角度并且增加扔球的速度
11) 一个重有0．15千克的球以每秒20公尺的速度往网飞去，可是被捕手
以0．010秒接住。那棵球平均停下的力是多少？
(1) 3.0 × 10–2 N (3) 3.0 × 101 N
(2) 3.0 × 100 N (4) 3.0 × 102 N
12) 一个弹簧，它的常数是每公尺80．牛顿。这个弹簧在离它的平衡位置 0．30公尺的地方被转移。请问在这个弹簧里面的潜在的力是；
(1) 3.6 J (3) 12 J
(2) 7.2 J (4) 24 J
16)下列哪个句子最恰当形容了一个“核]质子被加速”
(1) 它制造了电磁辐射
(2) 它的负荷量增大
3)它吸收了一个中子，然后变成一个电子（是负的）
4） 它与其他[核]质子相互吸引
18) 如果电子和[核]质子之间的距离是一半（2等份）的话， 那么
在这些粒子（＋ ＝ － 粒子有这些符号）之间的静电力的量级是：
(1) 不变 (3) 4份之1
(2) 变2倍 (4) 变4倍
21） 如果一个电波的振幅在通过一条绳子上的时候变成了2倍， 那么电波在绳子里面的速度是：
(1) 减少
(2) 增加
(3) 不变
25）当一个横波”电过， 或者通过（不知道怎么表达）一个medium 的时候，哪个medium的粒子往．．．方向动
(1) 波向垂直的地方
(2) 波向并行的地方（跟电波一样的方向）
(3) 以圆圈的方式
(4) 以椭圆形的方式
终于写好了。。。。
1,下面哪一个是矢量?（1）电压（2）电场强度（3）电势差（4）电阻5,一个机器发射一个网球,发射的方向与水平位置成25度角,速度是14米/秒.球经过飞行回到水平位置.如果要想在第二次发射时延长网球在空中的飞行时间,那...