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Com plete the follow ing with the scientific exp iration

1)The four basic physical quantities are
,.......,.........and..........

2)the velocity of an object after 3 second initially at rest and moves with cons tant acceleration of 10 m/sec2 is…………………..

3)If 1 mile =1609.344 meters and 1hour = 3600 secnds then the 55 mph equal ...................M/sec

4)We have a vector A of 3.0 units in length and points along the positivex axis,and vector B of 4.0 units in length and points along the negative yaxis the magnitude and direction of the vector C which equal to a+b are …………………….. and

2-Answer the follow ing question
· 1-which of the equations below are dimensionally correct ?
+at B)y=(2m)cos (kx) A)v=v0


· 2- Avector has xcom pon ent of -15units and y com pon ent of 20 units.find the magnitude and direction of this vector ?

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· 3- A stone is dropped from rest at the top of building of height 50 m. after 3 sec of free fall, what is the displacement of the stone fare from the ground?
· 4- If you walk exactly 5 times around a quarter – mile track , what are the distance and displacement ?

3- What the correct answer:
o 1- on an x-versus – t plot the slope of a tangent line equals

* a- average velocity ,
* b- average velocity,
* c- average velocity,
* d- average velocity,

o 2- which of the following numbers is proper scientific notation for 25,300?

* a- 2.53 10$
* b- 25.3 10#
* c - 2.53 10#
* d- 0.253 10%

o 3- Given that the quantities X (m), V(m/s), and T (s) are measured in the units shown in parentheses. The correct dimensional analysis on the following equations:

* a- X=V/T
* b- X=2V/T
* c- X=V/T
* d- X=VT+3At@

o 4- An object moves east with a speed of 3.0 m/s, if its acceleration is westward , the object is

* a- speeding up
* d- slowing down
* c- maintaining constant speed
* d- none of these

o 5- How long does it take a person on a bicycle to travel exactly one kilometer if she rides at a constant velocity of 20m/s?

* a- 20000s
* b- 0.020s
* c- 50s
* d- 20s

o 6- Starting from rest, an object accelerates with 3.32m/s@ . what will its instantaneous velocity be 3.00 s later?

4- The period T of simple pendulum is measured in times units and given by:
T= 2∏√ (ι/g)
Where is the length of the pendulum and g is the acceleration due to gravity . Show that the equation is dimensionally correct.

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