A 53.0 kg sled is sliding on snow with μk=0.110. how much friction force does it feel?
2 answers:
Answer:
Force, F = 57.134 N
Explanation:
It is given that,
Mass of the sled, m = 53 kg
Coefficient of kinetic friction,
We need to find the force of friction felt by sled. The force of friction is given by :
F = 57.134 N
So, the force of friction felt by the sled is 57.134 N. Hence, this is the required solution.
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Answer:
Resistivity
It depends upon cross sectional area and length of material
Explanation:
The resistance of any material is given by , here
is the resistivity of material , l is length of material and A is cross sectional area
So resistivity
So resistuivity of any material depends upon area of cross section and length of material
If cross sectional area will be more then resistivity will be more. And is length of the material will be more then resistivity will be less
Answe
given,
mass of the bar, m = 30 Kg
distance of rise, h = 0.60 m
Assuming the efficiency = 25 %
energy from the pizza slice = 300 C = 1260 kJ
To consume Energy from the pizza bar is to be pulled several number of time.
( energy from pizza ) x (efficiency) = n m g h
n is the number of lift
( 1260 x 10³) x (0.25) = n x 30 x 9.8 x 0.6
n = 1786 times.
Weightlifter should lift bar 1786 times to burn off the energy.
To solve this problem it is necessary to apply the continuity equations for which it is defined that the proportion of Area in the initial section is equal to the final section. In other words,
Where,
Cross sectional area at each section
Velocities of fluid at each section
The total area of the branch is eighteen times of area of smaller artery. The average cross-sectional area of each artery is
Therefore the Cross-sectional area at the end is
Applying the previous equation we have then
The ratio of the velocities then is
Therefore the factor by which the velocity of blood will reduce when it enters the smaller arteries is 0.1349