7316082
Description
Flashcards by hagar hany, updated more than 1 year ago
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Created by hagar hany
over 7 years ago
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| Question | Answer |
| 7 base units? | time,t,(s) length,l,(m) mass,m,(Kg) Temp,T,theta,(K) Electric current,I(A) amount of subs,n,(mol) Luminous intensity(cd) |
| Prefixes of the following multipliers: a)10^12 b)10^9 c)10^6 d)10^3 e)10^-1 f)10^-2 g)10^-3 h)10^-6 i)10^-9 j)10^-12 k)10^-15 | a-tera b- giga c-mega d-kilo e-deci f-centi g-milli h-micro i-nano j-pico k-femto |
| How to add scalar quantities? | using simple arithmetic Add |
| How to add vectors along the same straight line? | RESULTANT=F1+F2 |
| vectors in opposite direction? | Resultant= F1 - F2 |
| How to calculate perpendicular forces? (Magnitude+Direction) | *the resultant is the diagonal of the rectangle *MAGNITUDE: using Pythagoras' *DIRECTION: using tan(theta)=Opp/Adj |
| EXAMPLE: If a trampolinist's initial speed at A is 6 m/s(down) & final speed at B is 10 m/s(Up) What is the change in VELOCITY? | ANSWER 1) Change in speed: new speed-old speed 10-6=4 m/s 2) change in velocity(Vector) => vector subtraction =new-old =10-(-6) =+16 m/s |
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