BILIRAN PROVINCE STATE UNIVERSITY
SCHOOL OF ENGINEERING
BACHELOR OF SCIENCE IN ELECTRICAL ENGINEERING
PHYSICS FOR ENGINEERS
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MIDTERM EXAMINATION
A.Y. 2022 – 2023 2ND SEMESTER
NAME: ______________________________________
COURSE/SECTION: ____________________________
DATE: ______________________________________
I. Problems solving: Solve for the following problems. Show your solution in
proper order.
1. A horizontal force of 300lb pushes a 200lb block up
an incline whose slope is 3 vertical to horizontal.
If coefficient of friction is 0.2, determine the time
required to increase the velocity of the block from
10 to 50 ft per sec.
2. The power winch A hoists the 800-lb log up the 30
deg incline at a constant speed of 4 m/s sec. If
the power output of the winch is 6 hp, compute the
coefficient of kinetic friction between the log and
the incline. If the power is suddenly increased to
8 hp, what is the corresponding acceleration a of
the log?
3. The crawling wrecking crane is
moving with a constant speed of
2 mi/hr when it is suddenly
brought to a stop. Compute the
maximum angle theta through
which the cable of the wrecking
ball swings.
4. The 120-lb woman jogs up the flight of
stairs in 5 seconds. Determine her average
power output. Convert all given information
to SI units and repeat your calculation.
5. The 20-lb block is moving to the right with
a velocity of 2 ft/sec on a horizontal surface when a force P is applied to
it at time t = 0. Calculate the
velocity v of the block when t = 0.4
sec. The coefficient of kinetic
friction is μk = 0.3.
6. The loaded 150 kg skip is rolling down the
incline at 4 m/s when a force P is applied to
the cable as shown at time t = 0. The force P
is increased uniformly with the time until it
reaches 600 N at t = 4 s, after which time it
remains constant at this value. Calculate (a)
BILIRAN PROVINCE STATE UNIVERSITY
SCHOOL OF ENGINEERING
BACHELOR OF SCIENCE IN ELECTRICAL ENGINEERING
PHYSICS FOR ENGINEERS
the time t’ at which the skip reverses it direction and (b) the velocity v
of the skip at t = 8 s. Treat the skip as a particle.
P
II. Multiple Choice. Encircle the letter of the correct answer.
1. A vehicle accelerates at a constant rate from 20 m/s to 35 m/s while it
travels 300 m. Find the time needed to achieve this speed.
A. 9.12 s C. 11.17 s
B. 10.9 s D. 12.87 s
2. A kid throws a stone upward with 10 m/s initial speed and took 5 seconds to
strike the ground. Find the height the stone was thrown.
A. 42 m C. 62 m
B. 52 m D. 72 m
3. The acceleration of a system at any instant has two components, radial and
tangential components. These two components will be
A. Parallel to each other
B. Perpendicular to each other
C. Inclined at 45 degrees
D. Opposite to each other
4. A particle remains at rest or continues to move with uniform velocity (in a
straight line with a constant speed) if there is unbalanced force acting
upon it. This is stated in
A. Newton’s Third Law of Motion
B. Newton’s Second Law of Motion
C. Newton’s First Law of Motion
D. None of the above
5. It is the quantitative measure of the inertia or resistance to change in
motion of a body.
A. Mass C. Weight
B. Force D. Acceleration
