J.J. Thomson discovered the electron by noticing that: A. molecules with the same atoms exhibited the same chemical properties.
B. a beam of particles could be influenced by an electric or magnetic force. C. chemical compounds contained various combinations of at least two atoms. D. some particles in a beam were deflected when passed through a sheet of gold foil.
1 answer:
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Answer with Explanation:
We are given that
Initial velocity,u=4.5 m/s
Time=t =0.5 s
Final velocity=v=0m/s
We have to find the deceleration and estimate the force exerted by wall on you.
We know that
Acceleration=
Using the formula
Acceleration=
deceleration=a=
We know that
Force =ma
Using the formula and suppose mass of my body=m=40 kg
The force exerted by wall on you
Force=
Explanation:
Assuming that all forces extend from the origin point, with and
lying in the xy plane, so
is along the z axis. So, we have:
The net force is:
The force () that would exactly counterbalance these three forces will be opposite in direction and equal in magnitude to the net force: