Q # 1: Consider a box that is placed on different surfaces. Marks = 10
a) In which situation (s) is there no force acting on the box?
b) In which situation (s) is there a static friction force acting on the box?
c) In which situation (s) is there a kinetic friction force acting on the box?
Various possible situations are as under:
I. The box is at rest on a rough horizontal surface.
II. The box is at rest on a rough tilted surface.
III. The box is on the rough-surfaced flat bed of a truck- the truck is moving at a constant velocity on a straight, level road and the box remains in the same place in the middle of the truck bed.
IV. The box is on the rough-surfaced flat bed of a truck- the truck is speeding up on a straight, level road, and box remains in the same place in the middle of the truck bed.
V. The box is on the rough-surfaced flat bed of a truck- the truck is climbing a hill, and the box is sliding towards the back of the truck.
Q # 2 A spaceship is moving in the vacuum of outer space, far from any planet, when its engine dies. As a result, the spaceship slows down and stops. What does Newton‘s first law say about this event? Marks = 5
Solution:-
In this situation there are no forces acting on the spaceship, so according to Newton’s first law, it will not stop. It continues to move in a straight line with constant speed, some science fiction movies have made use of very accurate science; this was not one of them.
Q # 3: A traffic light of weight W hangs from two light cables; one on each side of the light. Each cable hangs at a 450 angle from the horizontal. What I the tension in each cable? Marks = 5
Tuesday, October 26, 2010
Saturday, October 16, 2010
What is MDB & GDB?? Carries Marks??
We are still receiving many email from 1st semester students regarding GDB & MDB.
It is to informed you that in your Graded Discussion Board (GDB) VU will announce a topic & you have required to give the answer of that topic/question within due time (2-4 days from announcement). After due date VU announce result and give you marks, these marks included in your CGPA in the end of that course.
On the other hand, Moderated Discussion Board (MDB) is the environment in which you'll ask the questions (in which you are facing problem to understand) to your instructor and after some time your instructor give you answer of that question. Its just a discussion board for all of you and has NO MARKS. In this board you are encourage to ask maximum Questions in which confused.
Best of luck..
VuFlankerz HelpDesk..
It is to informed you that in your Graded Discussion Board (GDB) VU will announce a topic & you have required to give the answer of that topic/question within due time (2-4 days from announcement). After due date VU announce result and give you marks, these marks included in your CGPA in the end of that course.
On the other hand, Moderated Discussion Board (MDB) is the environment in which you'll ask the questions (in which you are facing problem to understand) to your instructor and after some time your instructor give you answer of that question. Its just a discussion board for all of you and has NO MARKS. In this board you are encourage to ask maximum Questions in which confused.
Best of luck..
VuFlankerz HelpDesk..
Monday, September 27, 2010
Saturday, September 25, 2010
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