PHY 111 PART 1 FINAL EXAM
QUESTIONS AND ANSWERS
A runner travels 2.5 north, jogs 4 miles south, and runs 1.5 miles north once more.
Which of the following is a true statement? - ANSWERSThe magnitude of the total
displacement is less than the distance traveled.
On which of these hills does the ball roll down with increasing speed and increasing
acceleration along the path? - ANSWERSThe hill on the right (starts at top like roller
coaster) look at notes for picture
A tourist accidentally trips drops a croissant from a 60.0 m ledge on the Eiffel tower that
takes 3.2 seconds to hit the ground. If g=9.81 m/s2, air resistance is disregarded, and
the tourist's tripping provides the croissant an initial velocity downward, what is the initial
speed provided by the tourist's tripping? What speed does the croissant hit the ground?
- ANSWERSlook at notes for work, 3 m/s A. B= 34.4 m/s
Which of the following is NOT an example of accelerating motion? - ANSWERSA car
traveling in cruise along a straight road. (Centripetal motion) (Change in velocity)
Use the following v/t graph to answer parts a and b. (LOOK AT NOTES FOR GRAPH)
At what point does the object return to its starting position? - ANSWERSt=9.5 s
A boat is moving to a point directly across a 100 m wide river. If the boat is moving at 10
m/s relative to the water, how long will it take the boat to cross the river if the river is
flowing 5 m/s perpendicular to the boat? (Look at notes for image) - ANSWERSgreater
than ten seconds
A ball is thrown into the air at some angle between 10 and 80 degrees. At the very top
of the path, the horizontal component of acceleration is: - ANSWERSzero/ only vertical
acceleration (9.81) no horizontal acceleration
A boat travels 250 km west on a lake. Upon reaching 250 km, it immediately turns right
to go 125 km North to stop and dock. What is the resultant displacement from where the
boat started to its dock? - ANSWERS280 km, 27degrees north of west. (LOOK AT
NOTES FOR WORK)
How does the speed of the ball at three points shown on the figure below compare?
(LOOK AT NOTES FOR IMAGE) - ANSWERSsB<sA=sC
, Car A initially at x=0 moves east at a speed of 30 m/s, while car B initially 400 m east of
car A moves west at a speed of 10 m/s. At what time will the cars meet? - ANSWERSt=
10 sec. LOOK AT NOTES FOR WORK
A car is first observed going 20 m/s east. Then 5 seconds later, the same car is
observed going 15 m/s north. What is the direction of the average acceleration of the
car during the 5 second interval? - ANSWERSNorthwest (LOOK AT NOTES FOR
WORK)
An elevator has a downward acceleration of 2 m/s2. A person, having weight of 800 N
as measured by a scale at rest on the ground, steps on a scale in the elevator. What
does the scale read? - ANSWERS636.9 kg (LOOK AT NOTES)
A 300 N sign is hanging in two wires both making an angle of 55 degrees with the
vertical. What is the horizontal component of the tension of the left cable? LOOK AT
NOTES FOR IMAGE - ANSWERS214.2 N(LOOK AT NOTES FOR WORK)
A thrown stone hits a window and breaks, which of the following the best explanation of
this scenario? - ANSWERSThe force of the stone on the glass=the force of the glass on
the stone.
A 40 N force and a 30 N force are acting concurrently on a 5 kg box. Which of the
following is not a possible acceleration of the box? - ANSWERS1 m/s (LOOK AT
NOTES)
A 14 kg box and 6 kg box are tied together and placed on a frictionless surface. A
second string is attached to the 14 kg box and a horizontal force of 10 N is applied to
the second string. Find the tension in the string between the two boxes. - ANSWERS3
N (LOOK AT NOTES)
A sled weighs 14 kilograms. It is held in place on a frictionless 22 degree slope by a
rope attached to a stake at the top; the rope is parallel to the slope. Find the tension in
the rope. Assume down the incline is the positive direction. - ANSWERS-51.45 N(LOOK
AT WORK)
A box with a mass of m sits on a frictionless inclined plane at an angle of 36 degrees. At
what acceleration does the block slide down the plane? Assume down the plane is the
positive direction. - ANSWERS5.77 m/s (LOOK AT WORK)
A person on a roof throws ball A directly downward, and an identical ball B at an angle
of 35 degrees above the horizontal at the same speed. Ball A hits the ground with a
velocity v. How does the vertical component of the velocity of ball B compare with the
velocity of ball A in which they both strike the ground? - ANSWERSless than v
Student A with mass M walks up a set of stairs of total height H in a time T. Student B
with mass 2m walks up the same set of stairs in a time of 2T. How does the power by
QUESTIONS AND ANSWERS
A runner travels 2.5 north, jogs 4 miles south, and runs 1.5 miles north once more.
Which of the following is a true statement? - ANSWERSThe magnitude of the total
displacement is less than the distance traveled.
On which of these hills does the ball roll down with increasing speed and increasing
acceleration along the path? - ANSWERSThe hill on the right (starts at top like roller
coaster) look at notes for picture
A tourist accidentally trips drops a croissant from a 60.0 m ledge on the Eiffel tower that
takes 3.2 seconds to hit the ground. If g=9.81 m/s2, air resistance is disregarded, and
the tourist's tripping provides the croissant an initial velocity downward, what is the initial
speed provided by the tourist's tripping? What speed does the croissant hit the ground?
- ANSWERSlook at notes for work, 3 m/s A. B= 34.4 m/s
Which of the following is NOT an example of accelerating motion? - ANSWERSA car
traveling in cruise along a straight road. (Centripetal motion) (Change in velocity)
Use the following v/t graph to answer parts a and b. (LOOK AT NOTES FOR GRAPH)
At what point does the object return to its starting position? - ANSWERSt=9.5 s
A boat is moving to a point directly across a 100 m wide river. If the boat is moving at 10
m/s relative to the water, how long will it take the boat to cross the river if the river is
flowing 5 m/s perpendicular to the boat? (Look at notes for image) - ANSWERSgreater
than ten seconds
A ball is thrown into the air at some angle between 10 and 80 degrees. At the very top
of the path, the horizontal component of acceleration is: - ANSWERSzero/ only vertical
acceleration (9.81) no horizontal acceleration
A boat travels 250 km west on a lake. Upon reaching 250 km, it immediately turns right
to go 125 km North to stop and dock. What is the resultant displacement from where the
boat started to its dock? - ANSWERS280 km, 27degrees north of west. (LOOK AT
NOTES FOR WORK)
How does the speed of the ball at three points shown on the figure below compare?
(LOOK AT NOTES FOR IMAGE) - ANSWERSsB<sA=sC
, Car A initially at x=0 moves east at a speed of 30 m/s, while car B initially 400 m east of
car A moves west at a speed of 10 m/s. At what time will the cars meet? - ANSWERSt=
10 sec. LOOK AT NOTES FOR WORK
A car is first observed going 20 m/s east. Then 5 seconds later, the same car is
observed going 15 m/s north. What is the direction of the average acceleration of the
car during the 5 second interval? - ANSWERSNorthwest (LOOK AT NOTES FOR
WORK)
An elevator has a downward acceleration of 2 m/s2. A person, having weight of 800 N
as measured by a scale at rest on the ground, steps on a scale in the elevator. What
does the scale read? - ANSWERS636.9 kg (LOOK AT NOTES)
A 300 N sign is hanging in two wires both making an angle of 55 degrees with the
vertical. What is the horizontal component of the tension of the left cable? LOOK AT
NOTES FOR IMAGE - ANSWERS214.2 N(LOOK AT NOTES FOR WORK)
A thrown stone hits a window and breaks, which of the following the best explanation of
this scenario? - ANSWERSThe force of the stone on the glass=the force of the glass on
the stone.
A 40 N force and a 30 N force are acting concurrently on a 5 kg box. Which of the
following is not a possible acceleration of the box? - ANSWERS1 m/s (LOOK AT
NOTES)
A 14 kg box and 6 kg box are tied together and placed on a frictionless surface. A
second string is attached to the 14 kg box and a horizontal force of 10 N is applied to
the second string. Find the tension in the string between the two boxes. - ANSWERS3
N (LOOK AT NOTES)
A sled weighs 14 kilograms. It is held in place on a frictionless 22 degree slope by a
rope attached to a stake at the top; the rope is parallel to the slope. Find the tension in
the rope. Assume down the incline is the positive direction. - ANSWERS-51.45 N(LOOK
AT WORK)
A box with a mass of m sits on a frictionless inclined plane at an angle of 36 degrees. At
what acceleration does the block slide down the plane? Assume down the plane is the
positive direction. - ANSWERS5.77 m/s (LOOK AT WORK)
A person on a roof throws ball A directly downward, and an identical ball B at an angle
of 35 degrees above the horizontal at the same speed. Ball A hits the ground with a
velocity v. How does the vertical component of the velocity of ball B compare with the
velocity of ball A in which they both strike the ground? - ANSWERSless than v
Student A with mass M walks up a set of stairs of total height H in a time T. Student B
with mass 2m walks up the same set of stairs in a time of 2T. How does the power by
