1.单选题- (共3题)

A.小球在上升阶段的平均速度大小为10 m/s |
B.小球在t1时刻到达最高点,此时加速度为零 |
C.小球落地前匀速运动,落地速度大小v1=10 m/s |
D.小球抛出瞬间的加速度大小为20 m/s2 |

A.斜劈对物体a的摩擦力一定减小 |
B.斜劈对地面的压力一定不变 |
C.细线对物体a的拉力一定增大 |
D.地面对斜劈的摩擦力一定增大 |

A.b、卫星转动线速度大于7.9km/s |
B.a、b、c做匀速圆周运动的向心加速度大小关系为aa>ab>ac |
C.a、b、c做匀速圆周运动的周期关系为Tc>Tb >Ta |
D.在b、c中,b的动能最大,c的机械能最大。 |
2.选择题- (共1题)
My first visit to Angkor Wat was in 1980. The country had been at war for many years and the temple was deserted and falling to pieces. Plants were growing out of the roofs, and trees were growing in the courtyards.
Today, the temple is the scene of a busy repair programme. A team of 15 Indian experts are organizing a workforce of 400 Cambodians, most of them women, who are cleaning, repairing and rebuilding parts of this temple.
As I walked through the courtyards, I noticed the Cambodian women devote hours to cleaning carefully a tiny area of stone. Boards are laid down to protect the precious painted stones while the repair work is going on. There are very few machines and little heavy equipment. Workers carry building materials in buckets at the end of long poles. Piles of stones lie in a corner of the courtyard, waiting to be replaced.
The work of cleaning the stones is watched over by three Indian chemists. It is a very slow task. First they clean the stones with brushes using buckets of a weak chemical. Then gaps between the stones are filled in. Finally another material is painted onto the stones which will protect them from water forever.
Work starts every day at 7 a. m. and goes on until late afternoon six days a week, with a break at midday.
Evening is the best time to visit the temple, after the tour groups have left. As the sun sinks lower, shadows spread across the courtyard. After sunset, the sky turns pink. The grey stone towers take on a golden colour before turning pink. Nowhere else in the world can there be such a quiet, beautiful place.
3.多选题- (共3题)

A.在0- 2s内,木板Q下表面与水平面之间有摩擦力 |
B.在0-2 s内,摩擦力对Q的冲量是1N·s. |
C.P、Q之间的动摩擦因数为0.1 |
D.P相对Q静止的位置在Q木板的最右端 |

A.这列波的波速为30 m/s |
B.这列波的频率为1.25HZ |
C.从t时刻开始计时,质点c在t+0.6s时间内通过的路程等于30 cm |
D.从t时刻开始计时,质点a第一次到达平衡位置时,恰好是t+1/3s时刻 |


A.线圈中感应电动势的表达式为![]() |
B.P上移时,电流表示数减小 |
C.t=0时,电压表示数为![]() |
D.当原、副线圈匝数比为2︰1时,电阻上消耗的功率为100W |
4.解答题- (共2题)

(1)在运动中产生的焦耳热Q最多是多少?
(2)当ab棒的速度变为初速度的





(1)油滴在第三象限运动时受到的重力、电场力、洛伦兹力三力的大小之比,并指出油滴带何种电荷;
(2)油滴在P点得到的初速度大小:
(3)油滴在第一象限运动的时间。
5.实验题- (共1题)
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【1】题量占比
单选题:(3道)
选择题:(1道)
多选题:(3道)
解答题:(2道)
实验题:(1道)
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【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:2
5星难题:0
6星难题:7
7星难题:0
8星难题:0
9星难题:0