Qualification > Sciences
Edexcel PHYSICS Doubts
dk bose:
Why do aircraft take off and land into the wind?
A ball on a snooker table is hit by another ball and travels at a distance of 50cm due west.it is then hit again and travels a distance of 30cm due north.Using a scale drawing,or by calculation,work out the snooker ball's displacement from its starting position.
A ship is travelling at 5m/s with a bearing of 20 deg east of north.there is a current of 1m/s flowing from the west.What is the resultant velocity of the ship?
Aristotle argued that a force was needed in order to keep an object moving.Describe some everyday situations that are consistent with this argument. Suggest a more scientific explanation for each case that you describe.
ANYONE PLZZZ TRY TO SOLVE THESE QUESTIONS AND GIVE THE SOLUTIONS AS FAST AS POSSSIBLE!!!!!! ITZZZZ URGENT!!!!!!!!
astarmathsandphysics:
aircraft take off into the wind to increase lift at low speeds. Lif depends on the speed of air over the wings.
For the second question you have to draw a scale diagram for which you need an artist.
3rd question - pushing a car uphill.
See here http://www.astarmathsandphysics.com/ib_physics_notes/history_and_development_of_physics/ib_physics_notes_aristotles_idea_of_motion.html
The scientific view would be that air resistance acts against the direction of motion to slow the velocity.
EVIL DOCTOR:
Your dog is running around the grass in your back
yard. He undergoes successive displacements 3.50 m south,
8.20 m northeast, and 15.0 m west. What is the resultant
displacement?
need asap
Malak:
--- Quote from: EVIL DOCTOR on November 20, 2011, 03:39:35 pm ---Your dog is running around the grass in your back
yard. He undergoes successive displacements 3.50 m south,
8.20 m northeast, and 15.0 m west. What is the resultant
displacement?
need asap
--- End quote ---
Draw a diagram like this (attached)
You have to resolve the pink vector into its component.
As it is in the north-east direction the angle would be 45.
So the x-component will be 8.2cos45 and y will be 8.2sin45
Now add them up as we normally do in vectors.
astarmathsandphysics:
In north direction -3.5 +8.2 cos 45=2.3
east 8.2 sin 45 -15 =-9.2
displacement= 2.3 m north and -9.2 east
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