A block slides on a table pulled by a string attached to a hanging weight. In case 1 the block slides without friction and in ca
2 answers:
Answer:
In case 2
Explanation:
Thinking process:
The friction is a force that tends to oppose motion.
In case 1, the block slides without friction. This means that the surface is a smooth surface. Thus, the net force needed to pull the string is minimal.
In case 2, there is kinetic friction between the sliding block and the table. Now, the kinetic friction is given by the formula:
where, = coefficient of friction and N = normal force.
Thus, the net force needed:
Thus, the force is larger in case 2.
Therefore, the tension is larger in case 2.
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Answer:
Explanation:
For the first ball, the moment of inertia and the kinetic energy is:
So, replacing, we get that:
At the same way, the moment of inertia and kinetic energy for second ball is:
So:
Then, is equal to
, so:
Finally, solving for , we get:
Answer:
a.3.20m
b.0.45cm
Explanation:
a. Equation for minima is defined as:
Given ,
and
:
#Substitute our variable values in the minima equation to obtain :
#draw a triangle to find the relationship between and
.
#where
Hence the screen is 3.20m from the split.
b. To find the closest minima for green(the fourth min will give you the smallest distance)
#Like with a above, the minima equation will be defined as:
, where
given that it's the minima with the smallest distance.
#we then use to calculate
=4.5cm
Then from the equation subtract from
:
Hence, the distance is 0.45cm