Answer:
, 6.1 s
Explanation:
The motion of the dropped penny is a uniformly accelerated motion, with constant acceleration
towards the ground. If the penny is dropped from a height of
the vertical position of the penny at time t is given by the equation
where the negative sign is due to the fact that the direction of the acceleration is downward.
We want to know the time t at which the penny reaches the ground, which means h(t)=0. Substituting into the equation, it becomes
And re-arranging it, we find an expression for the time t:
And substituting the numbers, we can also find the numerical value:
<span>Learning by assimilation is so effective for it involves a
concise and logical approach. Most people who require clear understanding and explanation
of ideas, information and abstract concepts must use this approach of learning.
The reason is that, they are more attracted to logically sound theories rather than more
focus on people approach and based on practical value. </span>
In assimilating learning, people prefer readings, listening to
lectures, exploring analytical models, and having time to think things through
on their own. With this, all the important concept and data is clearly
inculcated and stored in mind.
i'm not sure. I will find out for you and let you know as soon as possible.
<h2>
The magnitude of the average force acting on the ball during the collision is 340.57 N</h2>
Explanation:
Force is given by rate of change of momentum.
Mass of bullet = 555 g = 0.555 kg
Initial velocity = 14.9 m/s
Final velocity = -12.1 m/s - Opposite direction
Change in momentum = 0.555 x 14.9 - 0.555 x (-12.1)
Change in momentum = 14.985 kg m/s
Time taken = 0.044 s
Rate of change of momentum = Change in momentum ÷ Time
Rate of change of momentum = 14.985 ÷ 0.044
Rate of change of momentum = 340.57 N
Force = 340.57 N
The magnitude of the average force acting on the ball during the collision is 340.57 N
