Modeling and Kinematics check

The linear velocity of a body rotating at ω rad/s along a circular path of radius r is given by

• ω.r

• ω/r

• ωs2.r

• ωs2/r

A balloon starts rising from rest from the ground with an acceleration of 1.25 m/s2. After 8s, a stone is released from the balloon. The stone will :

• Cover a distance of 40 m

• Begin to move down after being released

• Reach the ground in 4s

• Have a displacement of 50 m

Suppose that an object travels from one point in space to another. Make a comparison between the displacement and the distance traveled.

• The displacement is either less than or equal to the distance traveled.

• The displacement can be either greater than, smaller than, or equal to the distance traveled.

• The displacement is always equal to the distance traveled.

• none

What is a model analysis?

• Adopted structure

• A small-scale replica

• Theory structure.

• Actual structure

A car moves with a constant speed through 150 m in 5 s.What is its speed?

• 0.033 m/s

• 750 m/s

• 0 m/s

• 30 m/s

Displacement of a body is a _____ quantity.

• scalar quantity nor vector quantity

• vector quantity

• scalar quantity and vector quantity

• scalar quantity

What is a prototype?

• Actual structure

• A small-scale replica

• Adopted structure

• Theory structure.

A ball is thrown from a point on ground at some angle of projection. At the time a bird starts from a point directly above this point of projection at a height h horizontally with speed u. Given that in its flight ball just touches the bird at one point. Find the distance on ground where ball strikes:

• 2u√(h/g)

• 2u√(2h/g)

• u√(h/g)

• 2u√(h/2g)

_______ is the motion along a curved path.

• rectilinear motion

• plane motion

• curvilinear motion

• none

Why do we need a model analysis?

• For determining the dimensions

• To provide a safe design

• To check the thermal diffusivity

• To check the shear stress