A: Mx=0,My=0,Mz≠0
B: Mx=0,My≠0,Mz=0
C: Mx≠0,My=0,Mz=0
D: Mx≠0,My=0,Mz≠0
举一反三
- 力F作用在OABC平面内,x轴与OABC平面成q 角(q = 90°),如图,则力F对三轴之矩为( )。[img=169x144]17e0ae97851da76.jpg[/img] A: Mx = 0,My = 0,Mz≠0; B: Mx = 0,My≠0,Mz = 0; C: Mx≠0,My = 0,Mz = 0; D: Mx≠0,My = 0,Mz≠0。
- 一力F作用在平面OABC上(如图所示),于是力F对OX、OY、OZ三轴之矩应为()。 A: mx(F)=0,my(F)=0,mz(F)=0 B: mx(F)=0,my(F)=0,mz(F)≠0 C: mx(F)≠0,my(F)≠0,mz(F)=0 D: mx(F)≠0,my(F)≠0,mz(F)≠0
- 图示力F的作用线在OABC平面内,此力对各坐标轴之矩为()。[img=566x480]17e0ba674f72d05.png[/img] A: Mx(F)≠0,My(F)≠0,Mz(F)≠0 B: Mx(F)≠0,My(F)≠0,Mz(F)=0 C: Mx(F)≠0,My(F)=0,Mz(F)=0 D: Mx(F)=0,My(F)=0,Mz(F)=0
- 若一个空间力与x轴相交,但不与y轴、z轴平行和相交,则它对三个坐标轴之矩应是()。 A: Mx(F)≠0、My(F)≠0、Mz(F)≠0 B: Mx(F)=0、My(F)≠0、Mz(F)≠0 C: Mx(F)=0、My(F)=0、Mz(F)≠0 D: Mx(F)=0、My(F)≠0、Mz(F)=0
- 图示力F作用线在OABC平面内,则力F对空间直角坐标系Ox,Oy,Oz轴之矩,正确的是( )。[img=274x233]17e0ba6794e0fd7.png[/img] A: mx(F)=0,其余不为零 B: my(F)=0,其余不为零 C: mz(F)=0,其余不为零 D: mx(F)=0,my(F)=0,mz(F)=0
内容
- 0
如图所示,在边长为a的正六面体的棱边CD上,作用着与其重合的力F,则力F对x、y、z轴的矩为[img=351x334]17de8f8200fff66.png[/img] A: Mx(F)= -Fa, My(F)=Fa, Mz(F)=0 B: Mx(F)=0 My(F)=0 Mz(F)=Fa C: Mx(F)=Fa My(F)= -Fa Mz(F)=0 D: Mx(F)=0 My(F)=0 Mz(F)=0
- 1
若已知力F对直角坐标系原点O的力矩矢的大小∣MO(F)∣,方向沿Oy向,则此力对此坐标系中各轴的矩为()。 A: Mx(F)=0, My(F)=0,Mz(F)=0 B: Mx(F)=0,M y(F)= ∣MO(F)∣,Mz(F) =∣MO (F)∣ C: Mx(F)=0,My(F)= ∣MO(F)∣,MZ(F)=0 D: Mx(F)=0,My(F)=0, Mz(F)= ∣MO(F)∣
- 2
图示力F对各坐标轴之矩为( )。[img=308x273]1803c3479387f13.jpg[/img] A: My(F)=0,其余不为零 B: Mx(F)=0,My(F)=0,Mz(F)=0 C: Mz(F)=0,其余不为零 D: Mx(F)=0,其余不为零
- 3
空间任意力系的平衡方程为:________。 A: ∑Fx=0,∑Fy=0,∑Fz=0 B: ∑Mx(Fi)=0, ∑My(Fi)=0, ∑Mz(Fi)=0 C: ∑Fx=0,∑Fy=0,∑Fz=0,∑Mx(Fi)=0, ∑My(Fi)=0, ∑Mz(Fi)=0 D: 没有正确答案
- 4
杆件ABC在B点和C点受荷载作用如图所示,则固定端A的约束反力和反力矩分别为( )。[img=549x413]1802f402fc5e2d7.png[/img] A: Fx=0, Fy=600N, Fz=450N, Mx=-1350Nm, My=0, Mz=800Nm B: Fx=0, Fy=450N, Fz=600N, Mx=-1350Nm, My=0, Mz=800Nm C: Fx=0, Fy=600N, Fz=450N, Mx=-1350Nm, My=0, Mz=0 D: Fx=0, Fy=450N, Fz=600N, Mx=-1350Nm, My=0, Mz=0