the coefficient of static friction between a 40 kg picnic table and the ground below is .43. what is the greatest horizontal for
2 answers:
Answer:
The greatest horizontal force that can be exerted without moving the table is 168.56N.
Explanation:
The maximum friction force is determined from the coefficient of static friction as follows:
where the the normal force is exerted by the ground as a reaction to the weight of the table, and has same magnitude as but opposite direction to the gravitational force on the table:
This is the <em>maximum</em> static force, so the friction force will be matching and opposing any horizontal force up to 168.56N.
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Answer:
(1) passed through the foil
Explanation:
Ernest Rutherford conducted an experiment using an alpha particle emitter projected towards a gold foil and the gold foil was surrounded by a fluorescent screen which glows upon being struck by an alpha particle.
- When the experiment was conducted he found that most of the alpha particles went away without any deflection (due to the empty space) glowing the fluorescent screen right at the point of from where they were emitted.
- While a few were deflected at reflex angle because they were directed towards the center of the nucleus having the net effective charge as positive.
- And some were acutely deflected due to the field effect of the positive charge of the proton inside the nucleus. All these conclusions were made based upon the spot of glow on the fluorescent screen.
