The document provides instructions for a physics exam with two parts: an objective section with multiple choice questions and a problem solving section requiring numerical solutions. It details exam policies like writing solutions in the test booklet and indicates the perfect score is 100 points. The 16 problem solving questions cover topics like thermal expansion, density, buoyancy, heat transfer, and fluid dynamics. Solutions to sample problems are provided in the answer key.

1. SANTIAGO CAMPUS
Prelim Exam
NSCI0309 Physics 2
Instructions:
(PLEASE READ BEFORE THE EXAM STARTS)
No ID, No test booklet, No permit means NO EXAM.
Write your set letter on the upper right corner of the booklet.
For the objective part, AVOID ERASURES. Erasures will render you answer wrong.
For the problem solving part, write your solution on your test booklet. NO SOLUTION, NO POINT. Enclose your final answer
with a box. NO BOX NO POINT.
Write your answers and solutions in your test booklet.
The Perfect Score is 100 points.
SET A
I. Objective: Write the best answer which best satisfy the question asked.(1 point each)
1. It is defined as the change in the dimension of a substance due to change in temperature
2. It is the expansion in length of solid bodies on heating
3. It is a nonsolid state of matter in which the atoms or molecules are free to move past each other, as in a gas
or a liquid.
4. It is considered the concentration of matter of an object.
5. The objects with greater density than the fluid where it is immersed will _________.(sink or float)
6. It is the amount of energy needed to raise the temperature of 1kg of the substance by 1K (or 1 ºC)
7. It is the energy required to raise the temperature of a substance by 1 degree Celsius
8. When solids are heated up, they ___________.(compress or expand)
9. Water is the densest at how many degrees Celsius?
10. The upward force that fluid exerts on an objects that are partially or completely submerged in it.
11. It states that any object completely or partially submerged in a fluid experiences an upward buoyant force
equal in magnitude to the weight of the fluid displaced by the object.
12. Buoyancy can be changed by changing __________________.
13. The density of hydrogen is about ________of the air.
14. It is the magnitude of the force on a surface per unit area.
15. 1 bar is equivalent to how many torr?
16. It is the experimental technique that measures the heat transferred in a chemical or physical process
17. It states that the pressure applied to a fluid in a closed container is transmitted equally to every point of the
fluid and to the walls of the container.
18. It is the pressure due to the weight of the column of liquid on top of the object.
19. It is the sum of the gauge pressure and atmospheric (barometric) pressure which is about 14.7 pounds per
square inch (PSI)at sea level.
20. It is the internal friction of a fluid
II. Problem Solving: Solve the following problems and enclose your final answer in a box. (10 points each)
3
1. A tapered pressurize tank for a rocket contains 0.5m of kerosene, which has a mass of 200kg. The pressure at the
5
top of the kerosene is 2.05x10 Pa. The kerosene exerts a force of 16.4kN on the tank’s bottom, which has an area of
2
0.100m . Find the depth of the kerosene.
3
2. A 100kg rock of density 2500kg/m is immersed in a lake and must be moved from near a boat dock. Calculate the
force needed to lift the rock while it is under the water.
3. Calculate the flow rate of water moving at an average speed of 50cm/s through a garden hose of radius 2cm.
Calculate the speed of the water in a second hose of radius 0.5cm that is connected to the first hose.
4. The large pipe of a waterline has radius 0.1m and feeds 20 smaller pipes of radius 0.01m that carry water to homes.
-3 3 5 2
The flow rate of water in each of the smaller pipes is to be 6.0x10 m /s and the pressure is 5.0x10 N/m . The homes
are 10.0m above the main pipes. Calculate the average speed of the water in a) a smaller pipe and b) in the main pipe
c) Calculate the pressure on the main pipe. (density of water 1000 kg/m^3)

2. 5. How much taller is the Eiffel Tower on the hottest day of the summer (39 °C) than the coldest day of the winter (1 °C)?
The tower is 330 m tall measured (on the coldest day) from the top of the flagpole. Assume the tower is built of
-6 -1
structural steel α = 12 x 10 ⁰C .
6. What amount of change in temperature did a 0.5 kg copper metal undergo when it is initially 10.0 m long and
expanded by 0.00004 m? - ^-1
7. Determine the quantity of heat that must be added to raise the temperature of Mrs. Markham’s coffee (250 mL) from
20 ºC to 98.6 ºC. Assume that water and coffee have the same density and specific heat capacity.
(1ml=1cm^3;1000l=1m^3) - )
8. C C , what is the specific heat
capacity of the water. (1W=1J/sec)
GOOD LUCK!!!
MERRY CHRISTMAS AND HAPPY NEW YEAR
Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.
-- Samuel Johnson –
Prepared by: Checked by:
Engr. Michael F. Ancheta, ECE Engr. Edward Panganiban, MSIT, MCP
Instructor College Dean
ANSWER KEY
Prelim Exam
NSCI0309 Physics 2
SET A
I. Objectives
1. Thermal expansion 7. Heat capacity 14. Pressure
2. Linear thermal 8. Expand 15. 750.08
expansion 9. 4 degrees Celsius 16. Calorimetry
3. Fluid 10. Buoyant force 17. Hydrostatic
4. Density 11. Archimedes pressure
5. Sink principle 18. Gauge pressure
6. Specific heat 12. Average density 19. Absolute pressure
capacity 13. ¼ 20. Viscosity

3. II. Problem Solving
9. A tapered pressurize tank for a rocket contains 0.5m3 of kerosene, which has a mass of 200kg. The pressure at
the top of the kerosene is 2.05x105 Pa. The kerosene exerts a force of 16.4kN on the tank’s bottom, which has
an area of 0.100m2. Find the depth of the kerosene. Ans: 10.45m
10. A 100kg rock of density 2500kg/m3 is immersed in a lake and must be moved from near a boat dock. Calculate
the force needed to lift the rock while it is under the water. Ans: 588N
11. Calculate the flow rate of water moving at an average speed of 50cm/s through a garden hose of radius 2cm.
Calculate the speed of the water in a second hose of radius 0.5cm that is connected to the first hose. Ans: a)
628.32 cm3/s, b) 800cm/s
12. The large pipe of a waterline has radius 0.1m and feeds 20 smaller pipes of radius 0.01m that carry water to
homes. The flow rate of water in each of the smaller pipes is to be 6.0x10-3 m3/s and the pressure is 5.0x105
N/m2. The homes are 10.0m above the main pipes. Calculate the average speed of the water in a) a smaller pipe
and b) in the main pipe c) Calculate the pressure on the main pipe. Ans: a)19.1m/s b) 3.82m/s c)422891/m2
13. How much taller is the Eiffel Tower on the hottest day of the summer (39 °C) than the coldest day of the winter
(1 °C)? The tower is 330 m tall measured (on the coldest day) from the top of the flagpole. Assume the tower is
built of structural steel α = 12 x 10-6 ⁰C-1. Ans: 330.15m
14. What amount of change in temperature did a 0.5 kg copper metal undergo when it is initially 10.0 m long and
expanded by 0.00004 m? Ans: 0.235°C
15. Determine the quantity of heat that must be added to raise the temperature of Mrs. Markham’s coffee (250 mL)
from 20 ºC to 98.6 ºC. Assume that water and coffee have the same density and specific heat capacity. Ans:
82137J
16. A 60 W immersion heater takes 2.5 minutes to heat 0.5 kg of water from 21 to 25, what is the specific heat
capacity of the water. Ans: 4500J/kg°C