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1. ### physics

...v+u)t/2 30=xt/2 x=60/t----------(1) s=(v+u)t/2 70=x(10-t)/2--------(2) put (1) into (2) 70=(60/t) (10-t) /2 140=(60/t)(10) -(60/t)t 140=600/t-60 200=600...

2. ### al applied(friction)

...(d/2)cos(@ + \$) = R2(d)sin(@ + \$) W = 2R2 tan(@ + \$) ... (3) Put (3) into (2): R1 cos\$ + F1 sin\$ = 2R2 tan(@ + \$) ... (4) Put ...

3. ### A question

... on a street, you can&#39;t turn back if you don&#39;t stop. Your feet will not keep moving when you are trying to turn back.

4. ### electric shock

Q:would the person receive electric shock if he puts his finger at the place indicated by...floor in a bathroom. By standing with bare feet on the wet floor, the person has, in fact...

5. ### ways to reduce air pollutants

...of pollution in the air that many people may not be aware of is to put plants in your home that naturally clean the air. ... plants can help to purify approximately 100 square feet of space.

6. ### phy problems 1

... at the point that is directly opposite to S1, i.e. at the foot of the perpendicular from S1 to the line OQ. Point O ...

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1. ### 相關詞

 put foot down