Lv 5

# 徵求物理高手 20點

1.A basketball player grabbing a rebound jumps 76.0cm vertically.How much total time(ascent and descent) does the player spend (a) in the top 15.0cm of this jump and (b) in the bottom 15.0cm ? Do you results explain why such player seem to hang in the air at the top of a jump?

2. Two particles move along an Χaxis. The position of particle 1 is given by X=6.00 +3.00t+2 (in meters and seconds) ;the acceleration of particle 2 is given by a=-8.00t(in meters per secons squared and seconds) and,at t=0,its velocity is 20m/s. When the velocities of the particles match , what is their velocity?

3.The Χ components of vector is -25.0m and the Уcomponent is +40m (a)What is the magnitude of ? (b)What is angle between the direction of and the positive direction of Χ?

4.A person desires to reach a point that is 3.40km from her persent location and in a direction that is 35.0 north of east .However,she must travel along streets that are oriented either north-south or east-west .What is the minimum distance she could travel to reach her destination?

5.IN a game of lawn chess,where pieces are moved between the centers of squares that are each 1.00m on edge,a knight is moved in the following way(1)two squares forward,one square rightward; (2)two squares leftward , one square forward; (3)two squares forward ,one square leftward .What are (a)the magnitude and (b) the angle (reative to’’for-ward’’) of the kinght’s overall displacement for the series of three moves?

6.In Fig. 3-32, a cube of edge length a sits with one corner at the origin of an XYZ coordinate system. A body diagonal is a line that extends from one corner to another through the center. In unit-vector notation, what is the body diagonal that extends from the corner at (a) coordinates (0,0,0) , (b) coordinates (a,0,0) , (c) coordinates (0,a,0) , and (d) coordinates (a,a,0)? (e) Determine the angles that the body diagonals make with the adjacent edges. (f) Determine the length of the body diagonals in terms of a.

Update:

Rating

所列1.a籃球運動員搶反彈跳七十六點零厘米vertically.How多的總時間（上升和下降）不花的球員（a）在最高15.0厘米本跳，（b）在底部15.0厘米？你解釋為什麼這些結果的球員似乎在空中懸掛在頂部的跳躍？

2。兩個粒子沿著一&Chi;axis。粒子的位置給出一經X = 6.003.00噸2（米，秒），加速粒子二是給予1 =-8.00噸（米每平方和secons秒），並在t = 0，其速度是20米/秒當粒子速度的比賽，他們的速度？

3，&Chi;組成部分向量，二十五點○米和Уcomponent為+40米（1）什麼是幅度？ （二）什麼是夾角指導和積極方向&Chi;？

4，實行人渴望達到的一點是三點四○公里她度百分比的位置和方向是35.0北東。然而，她必須沿著街道要么是面向南北或東西。是什麼最小距離，她才能到達她的目的地？

5.IN遊戲棋的草坪，在那裡件的中心之間移動的平方是每個一點○○米邊緣，騎士移動通過以下方式（1）兩個廣場前進，向右一平方米;（2）兩個廣場向左，一平方米前進;（3）兩個廣場前進，一平方米的移動。什麼是（a）的嚴重性和（二）角（reative to&#039;&#039;for -病房&#039;&#039;）的騎士的整體位移的系列三招？

6.In圖。 3-32，一個立方體的邊長一坐在一個角落在原點的XYZ坐標系統。甲體對角線是一條線，擴展從一個角落到另一個通過該中心。在單位矢量符號，什麼是身體對角的範圍從一角（1）坐標（0,0,0），（二）坐標（1，0,0），（三）坐標（0，1， 0），和（d）坐標（1，1，0）？ （五）確定該機構的角度作出對角線與毗鄰的邊緣。 （f）確定的長度體對角線的條件答：

• 嗯哼
Lv 4