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Kinematics Numerical Problems

The velocity m, v m/s, of a particle is a straight line is given by
v = 6+pt+qt³
where t is the time in seconds after the particle passes through a fixed point O.
Given that t=2 s the distance of the particle from O is 16 m and its acceleration is 32m/s², calculate

a) the value of p and of q
b) the velocity of the particle at the instant when did acceleration is zero

Numerical Problems from Pressure, Density and Floatation

1. Ramesh buys 6 bottles of syrup each containing 1litre. Each empty bottle weighs 400g. The density of syrup is 1.2 g/cm3. What weight does Ramesh have to carry home?

2. The volume of 900g of a substance is 1000 cm3. Will the substance sink or float in water if the density of water is 1g/cm3. What will be the mass of water displaced by the substance?

A few numerical problems from laws of motion

  1. A worker pulls a 200. N packing crate with an applied force of 55.0 N.  The crate accelerates at a rate of 0.250  m/s(squared).  What is the coefficient of kinetic friction between the crate and the factory floor?
  2. A student pulls a 150. N sled up a 28 degree slope at a constant speed by applying a force of 100. N.  Near the top of the hill he releases the sled.  With what acceleration does the sled go down the hill?
  3. A 200. N crate rests on a ramp; the maximum angle just before it slips is 25 degrees with the horizontal.  What is the coefficient of static friction between the crate and the surface of the ramp?
  4. A man pulls a sled with a weight of 200. N with a constant velocity across a horizontal snow surface.  If a force of 80N is being applied to the sled rope at an angle of 53 degrees to the ground, what is the coefficient of friction between the sled and the ground?
  5. A jet plane is flying with  a constant speed along a straight line at an angle of 30degree  above the horizontal. The weight of plane is 86 500N. Its engine provides a forward thrust T of 103 000N. The lift of force L(directed perpendicular to the wings)and the force R of air resistance (directed opposite to the motion)act on the plane. Find L & R

i want score max marks in physics. So how much time must be given to study it ?

Amandeep asked:

“i want to score max marks in Physics. So how much time to be given to study it”

Mathew Abraham responds:

First of all I would like to say that “Don’t study just for marks!! “.

You have to concentrate on concepts and ideas and don’t leave until you fully grasped the idea. If you have understood the basic concept and how to apply it in different situations, learning Physics is just fun.

The time you should spend for studying Physics depends on how easy you can grasp the ideas.

Having a master plan is very important.

Depending on the time available to you before exams, arrange a daily plan of revision and ensure that you reach the target.

Have a regular plan for solving numerical problems systematically. Clarifying your doubts and questions related to the topic is important. (AskPhysics is always ready to give you an answer)

If you are a candidate for the AISSCE 2011, Then the following strategy will help you.

  • Have a collection of all 3 marks and 5 marks questions and their answers prepared in the most presentable manner. (show it to your teacher for any corrections or modifications) You can consult some text books for preparing the first draft. The 3 and 5 marks alone constitute 60 % of the total marks.
  • Solve and practice all the exercises from NCERT text (including examples and exercises) Many publishers have released solutions for NCERT exercises. If you can get one, it will be helpful.
  • As a last step practice at least 5 Previous Board Papers. (The more the best)
  • If you do the above, you can easily score more than 90% marks or more.
  • If any of the questions could not be answered by you, please feel free to ask here at www.askphysics.com

Once again I would like to remain, It’s not time; but the task in hand is more important.

Wish you all the best.

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