Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
1. If an immersed object displaces 8 N of fluid, what is the buoyant force on the block?
EXPLAIN.
2. How should you place a screw on a table such that it exerts the smallest pressure against it?.
EXPLAIN WHY.
3. An object with a volume of 100cm^3 is submerged in a swimming pool. What is the volume
of water displaced?. Why?.
4. You apply a flame to 1 L of water for a certain time and its temperature rises by 2°C. If you
apply the same flame for the same time to 2L of water, by how much does its temperature
decrease? . Why?
5. Which has greater kinetic energy?
A) a car traveling at 30 km/hr.
B) a car of half the mass traveling at 60 km/hr
C) both the same.
D) need more information
EXPLAIN.
6. A melon is projected into the air with 100 J of kinetic energy in the presence of air resistance.
When it returns to its initial level its kinetic energy is
A) less than 100 J.
B) more than 100 J.
C) 100 J.
D) need more information
EXPLAIN
7. Two identical golf carts move at different speeds. The faster cart has twice the speed and
therefore has
A) twice the kinetic energy.
B) four times the kinetic energy.
C) eight times the kinetic energy.
D) none of the above..
EXPLAIN.
8. What is the change in momentum that occurs when a 1.0 kg ball traveling at 3.0 m/s strikes a
wall and bounces back at 1.0 m/s?.
9. What would be your gravitational potential energy at the top of 20 meter tree if your mass was
60kg?.
10. How much energy would you consume daily if you kept a lightbulb of 20 watts on all day
long?.
11. What is the density of an object of mass 2kg and a volume of 0.5 cubic meters?.
12. If an object that has a volume of 4 cubic meters is inserted in a liquid, how much liquid
would it displace?. Explain.
13. An object that is 1 meter under water, experiences a pressure of 10 kg*m/s2.
A. What is the density of the liquid?.
B. What would be the pressure if it was 2 meters under water?
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