USING CONSERVATION OF ENERGY AND WORK ENERGY PRINCIPLE:
A block of mass m=1.8 kg on a table is pushed against a spring
that has a force constant of k=250 N/m, compressing it 20 cm (the
block is not attached to the spring). The block is then released,
and the spring pushes the block to move to the right. The
coefficient of kinetic friction between the block and the table is
0.45.
(a) Find the distance the block will travel before...
Bernoulli’s Principle
This activity will allow you to see Bernoulli’s Principle in
action. Some of the effects of fast moving air can be rather
surprising.
Equipment
Cup
Straw
Index cards
Blow Here
Water
Figure 1: The straws for Procedure 1
Procedure 1
Fill a small cup with water.
Cut the plastic straw in half. Hold one piece vertically in the
water, and the other in your hand.
Position the straws so that they are perpendicular to each
other, and arranged...
Understand and be able to state the followings:
• Archimedes’ Principle• Pascal’s Principle
• Bernoulli’s Principle• Hooke’s Law
• Newton’s Law of Cooling
• First Law of Thermodynamics
• Second Law of Thermodynamics
Principle of Conservation Energy is always being applied to
solve engineering mechanic analysis. Explain what is Principle of
Conservation Energy and when it is suitable to use this principle.
Use appropriate real life application in your discussion.
1. Conservation of Momentum Principle – In your own
words, explain the conservation of momentum, and the condition of
its application.
2. In your understanding, what real world applications could
benefit from the study of momentum and impulse?
1. For airflow through a fan, the mechanical energy balance with
fan work along with conservation of mass are:
-W(dot)fan=sum((m(dot)_exit)*(e_exit)) -
sum((m(dot)_inlet)*(e_inlet))
so...
0=sum(m(dot)_exit) - sum(m(dot)_inlet)
Using the mechanical energy balance and conservation of mass,
show that the theoretical fan power added to the air is flow rate
multiplied by the pressure rise:
W(dot)fan=?*?*P