9th MT3

the mass per unit volume has the dimensions of ......

• $M\ L^{-2}$

•  $M\ L^{-3}$ 

• $M$

• $M^{\ -1}\ L^{ }$

the dimensions of force are

• $M\ L^{-1}\ T\ ^{-2}$

• $M\ L^{-2}\ T\ ^{-2}$

• $M\ L^2\ T\ ^{-2}$

•  $M\ L^{ }\ T\ ^{-2}$ 

Which of the following is the unit of latent heat:

• J

• J mol^-1

• J Kg^-1

• J Kg^-1 mol^-1

The unit of force and length are doubled, the unit of energy will be :

• 1/4 times

• 1/2 times

• 2 times

• 4 times

Find the magnitude of the vector <2, -3>.

• √11
• 13
• √-4
• √13

Find the magnitude of the vector <5, 5>

• 0
• 10
• 25
• 7.07

Given u = <3, 7> and v =<-5, 4>, find 2v - 3u

• <21, 2>
• <-19, -13>
• <-15, 3>
• 23

What is the net force?
100 N        230 N
<------        --------->

• 30 N to the right
• 230 N to the right
• 130 N to the right
• This is a balanced force

A ball is thrown into the air. At the highest point, the ball has zero velocity and zero acceleration.

• True
• False

A train travels 6 meters in the first second of travel, 6 meters again during the second second of travel, 6 meters again during the third second. It's acceleration is __ m/s²?

• 0

• 6

• 12

• 18