Weekly Feedback Blog
Each day readers send in questions and feedback concerning the various lessons in the School for Champions website. A total of 11039 letters have been answered.
Although you can access the questions and feedback from the specific lessons, this blog is a listing of 2 letters answered during the week from today (7/4/09) to 7 days ago (6/27/09).
You can also select another week to view.
List of letters
Date |
Title(Click to jump to item) |
Subject |
Topic |
| 6/29/09 | About the force to throw an object upward | Science | Gravity Equations for Falling Objects |
| 6/29/09 | What happens if a neutron and an anti-proton collide? | Science | Antiparticles |
You can also select another week to view.
Science - Gravity Equations for Falling Objects
About the force to throw an object upward
June 29, 2009
Question
Why the obejct throughing upward has constant acceleration that is equal to (-g m/s^2)
I draw the free body of this object and from the dynamic equilibrium i found that acceleration 'a'= - g m/s^2.
but my doubt is, because for throughing object upward we need to apply force more that of its weight. it means acceleration somewhat more than g.Ashish - India (17952)
Answer
Throwing an object upward gives it a velocity due to an initial force, which would be greater than F = mg. But that is usually not of much concern unless you ant to measure that force. That upward force = v/t + mg, where t is the time that force is applied.
Once the object is moving upward, the effect of the force due to gravity takes over, which pulls the object down at F = mg, where m is the mass of the object.
Science - Antiparticles
What happens if a neutron and an anti-proton collide?
June 29, 2009
Question
what happens if a neutron and an anti-proton collide?
what happens if a proton and an anti-neutron collide?martin - USA (17953)
Answer
When a neutron and proton collide, as in a particle accelerator, they change directions as an elastic collision. If at high energies, x-rays or gamma rays are given off, due to the change in direction and deceleration.
An anti-proton is simply a proton with a negative (-) electrical charge, so the result would be similar to that of a neutron-proton collision.
An anti-neutron has an opposite spin as a neutron. A collision with a proton would be similar to a neutron-proton collision.
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