英语翻译
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 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
英语人气:237 ℃时间:2020-05-14 15:07:30
优质解答
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...
我来回答
类似推荐
猜你喜欢
- 1...__________?...That,s Tom,s ruler. A .Who ,s tom,s ruler? B Whose ruler is it? C What ruler is that? 请问 应该选哪个?
- 2我做了个热胀冷缩的实验,它瘪了之后,我把它放在锅里面拿热水泡(轻煮),为什么没有重新鼓起来,而是坏了呢?
- 3时针长3米,分针长5米.从上午8时到10时,时针尖端走过的路程是多少米
- 4体积相等的冰的质量比水的质量少十分之一现有一块重9kg的冰有一桶水的体积和这块冰的体积相等这桶水有多重
- 5从2000年到2012年,有_个闰年;21时是晚上_时,16时是下午_时;1996年有_个星期余_天.
- 6某车间加工8500个零件,比原计划多加工500个,比原计划多加工力百分之几?
- 7体积为Vml 密度为dg/cm3的溶液 含有相对分子质量为M的溶质mg 其物质的量浓度为cmol/L 质量分数为a% 请推导
- 8北京的冬季地上还有积雪,灰黑色的秃树枝丫叉于晴朗的天空中,而远处有一二风筝浮动,而我是一种惊异和悲哀
- 9他想参加什么俱乐部?用英语怎么说
- 10今天默写语文课文不过关被老师罚写反思500字左右,