To solve the exercise it is necessary to apply the equations necessary to apply Newton's second law and the concept related to frictional force.
An angle of 30 degrees is formed on the vertical at an applied force of 2.3N
In this way the frictional force, opposite to the movement will be given by
where,
Kinetic friction constant
N = Normal Force (Mass*gravity)
The friction force is completely vertical and opposes the rising force of 2.3 N. The Normal force acts perpendicular to the surface (vertical) therefore corresponds to the horizontal component of the applied force.
The ascending force would be given by
As the block is moving upward, the friction force acts downward, also its weight acts downward. We can have
Considering the horizontal force the normal force on the block must be balanced by the horizontal component of pishing foce
Then the frictional force
Therefore the coefficient of kinetic friction is 0.26
The definition of a scale of 1: 166 will mean that the scale of 1 in the model will be equivalent to 166 times the measurement in the real model, therefore we will have that the height would be 166 times smaller than the 179m given:
The same for the diameter,
The volume of a cylinder is given as
Therefore the volume would be
I believe it is b
Hope I helped!
Answer:
D
Explanation:
Kinetic energy = 1/2mV^2
From the formula above, we can deduce that kinetic energy is proportional to the square of speed. That is,
K.E = V^2
Graphically, the relationship isn't linear but a positive exponential. Therefore, option D is the correct answer.