1.We can estimate how long Titanic was floating on the frozen Atlantic before it completely sank. If we consider a model for the short time of bouncy, we can write the time as the following: t= Here h=6.67 1034 is Planck's constant. For energy E we can consider only weight of the ship, defined as E=mg, here g =9.81 2 , the mass for Titanic is 60 000 Tons. How long in (s) approximately takes for ship to be completely sank?

A)10^-35

B)10^-42

C)10^-27

d)10^-26

2.In classical mechanics , the total energy E has dimensions as 22. An useful function to study is called action, is defined by =21 here 1,2 are initial and final times. What is the dimension of the phase factor , defined as = ? The fundamental constant = is Planck's constant .

A)21

b)23

C)Dimensionless

D)2

3. If vectors A and B are orthogonal, what is the component of B along the direction of A? What is the component of A along the direction of B?

A)B.A,ZERO

B)A.B, B.A

C)ZERO,ZERO

D)ZERO, A.B

4. If the cross product of two vectors vanishes, what can you say about their directions?

A)They are parallel

B)They are orthogonal

C)They are same vectors

D)Either to be parallel or same vectors .

5. Given the displacement vector =(3 4 ) find the displacement vector so that + =4 , here =||| |||

3 16

3

3 8

6. If = then always:

A is parallel to (B-F)

A=0 is null vector

All of the above are correct.

B=F

7. Vector B is 5.0 cm long and vector A is 4.0 cm long. Find the angle between these two vectors when |A+B|=5.0 cm and |A-B|=4.0 cm.

90 degree

0

83 degree

180 degree