Which quantity may be calculated directly using Newton’s second law of motion?
2 answers:
a. weight
Explanation:
Newton's second law of motion states that:
where
F is the force acting on an object
m is the mass of the object
a is the acceleration of the object
If we take an object and we want to measure its weight, we can directly use this formula. In fact, the weight of an object is just equal to the force of gravity acting on the object, which is F in the previous formula. The acceleration, in this case, is g, the acceleration due to gravity, so the formula becomes
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Answer:
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Explanation:
For any question related to newons law of motion first draw the free body diagram(FBD),
The frequency is the number of complete oscillations per second. One complete oscillation corresponds to 1 push. Converting the time into seconds:
we can find the frequency of the swing:
we can find the frequency of the swing:
I will assume here that the well is sufficiently short so that the time the sound takes to come from the bottom of the well to our ear is negligible.
Since the pebble moves by uniformly accelerated motion, the distance it covers is given by
where
is the gravitational acceleration
is the time the pebble takes to reach the bottom of the well
Therefore, the depth of the well is
and the correct answer is B.
Since the pebble moves by uniformly accelerated motion, the distance it covers is given by
where
Therefore, the depth of the well is
and the correct answer is B.