英语翻译1 Which is a vector quantity?(1) electric charge(2) elec

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

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,那么应该选择以下的哪一个组合?
（1）降低发射角度,降低球的初速度
（2）降低发射角度,增加球的初速度
（3）提高发射角度,降低球的初速度
（4）提高发射角度,增加球的初速度
11,一个0.15千克的篮球以20米/秒的速度飞行,接球手花了0.10秒接住了这个球（使这个球停止飞行）.
那么阻止来球的阻力是多少?
(1) 3.0 × 10–2 N (3) 3.0 × 101 N
(2) 3.0 × 100 N (4) 3.0 × 102 N
12,两个具有80牛/米(功率）的弹簧被连接在一起,拉开0.3米保持均势.
那么这个弹簧潜在的能量（功)是多少?
(1) 3.6 J (3) 12 J
(2) 7.2 J (4) 24 J
16,下列关于质子加速的表述,哪一个是正确的?
(1) 引起强辐射.
(2) 电势差大大增加.
(3) 吸收一个中子转变成电子.
(4) 被其他质子所吸引.
18,如果将电子与质子之间的距离减半 ,那么在这些激烈的粒子之间存在的大量静电力将会
(1) 不变 (3) 变为原来的1/4
(2) 变为原来的2倍 (4) 变为原来的4倍
21,如果将电磁波的振幅提高两倍,那么电磁波的速度将会
(1) 减小
(2) 增大
(3) 保持不变
25,横波穿过某种媒介物质,那么这种媒介物质里特有的粒子将会移动,路线将是
(1) 与横波方向相垂直
(2) 与横波方向相平行
(3) 环圆行移动
(4) 呈椭圆形状移动
呵呵,参考一下