Recent content by Kile

The ## {H_2^+}## molecule consists of two hydrogen nuclei and a single electron.What kind of molecular bond do you think holds this molecular together? Explain.

Problem Statement: What's your result of ##X_A##? I find mine is different from the standard answer. Relevant Equations: My answer for $$X_A =5 kN$$ Problem Statement: What's your result of ##X_A##? I find mine is different from the standard answer. Relevant Equations: My answer for $$X_A...

You mean $$X_A = X_ B$$ It may not equals to 0. We just can't calculate it from the information already given. Is that what you are trying to say here?

Because point B has a pulley on the ground, ##N_B## is vertical. Choose A be centroid $$\sum m_A (F)=0, ~2a N_B + m=0$$ $$\Rightarrow N_B=\frac {-m} {2a},$$ So it's downward. X-axis, $$X_A=0$$ Y-axis, $$Y_A=0 $$ $$N_B + Y_A=0$$ $$\Rightarrow Y_A= -N_B = \frac {m} {2a}$$ So ##Y_A## it's upward.

How can u get it? can u help me out?

Why should it be like that? There are 2 situations Full load, W=200 kN. let ##Q_{min}## stands for the minimum weight requirement of Q. $$\sum m_B(F)=0, (6+2)Q_{min} + 2P - (12-2) W=0, N_A=0$$ No load, W=0 kN. let ##Q_{max}## stands for the maximum weight requirement of Q $$\sum m_A(F)=0...

Here is diagram for Tower Crane. The Rack weight P=700kN, and the maximum load capacity for this crane is W=200kN. The long beam length is 12 metres, and the balance object weighs Q. The short beam length is 6 metres. What is the weight of Q to keep the crane's balance at all situation?

How did u get ##N_A## ? Can u draw a diagram to illustrate?

Yes. You did it in the right format. Do u know how to get this official answer?

R_A= \frac m 2a, R_E=\frac \sqrt {{2} m} a,

The official answer just doesn't match mine.

1. The illustrated structure is affected by a known couple, and try to figure out the restraining reaction force of the hinge A and hinge E. We should analyse ECD instead. Since arm CD is a two force members, so N(C) in in the direction where CD connects by these two points. The distance from...