PHYSICS 131 FINAL EXAM QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED
A+||BRAND NEW
A skydiver's terminal velocity will be greatest if she falls
a) lying flat on her stomach.
b) lying flat on her back.
c) with her parachute open.
d) head first. - ANSWER-d
Padded dashboards in cars are safer in an accident than non-padded ones because passengers hitting
the dashboard encounter
a. shorter time of contact
b. lengthened time of contact
c. decreased impulse
d. increased momentum - ANSWER-b
Two identical objects in outer space, one moving at 2 m/s, the other at 1 m/s, have a head-on collision
and stick together. Their combined speed after the collision is
a. 1 m/s
b. 0.67 m/s
c. 0.33 m/s
d. none of the above - ANSWER-d
What is the acceleration of a car that starts from rest and 5 seconds later reaches a speed of 20 m/s?
a. 1 m/s
b. 2 m/s
c. 3 m/s
d. 4 m/s
,e. 5 m/s - ANSWER-d
A block pulled to the left with 15 N and to the right with 5 n at the same time experiences a net force of
a. 5 N
b. 20 N
c. 15 N
d. 10 N - ANSWER-d
Joshua is attracted to earth by a 500 N gravitational force. The Earth is attracted toward Joshua with a
force of
a. 0
b. 250 N
c. 500 N
d. 1000 N - ANSWER-c
The chef at the infamous Fattening Tower of Pizza tosses a spinning disk of uncooked pizza dough into
the air. The disk becomes wider during its flight, while its rotational speed
a. slows
b. quickens
c. remains constant - ANSWER-a
The average braking force of a 1000 kg car moving at 10 m/s braking to a stop in 5 s is
a. 3000 N
b. 1000 N
c. 5000 N
d. 2000 N
e. 4000 N - ANSWER-d
the distance a freely falling bowling ball falls each second
a. is about 10 m
,b. is about 5 m
c. increases
d. none of the above - ANSWER-c
A ring and a disk both at rest roll down a hill together. Which accelerates slower?
a. both roll at the same speed
b. ring
c. depends on the masses
d. disk
e. need more information - ANSWER-b
A coconut and a bird's feather fall from a tree through the air to the ground below. The force of air
resistance is
a. the same on each
b. greater on the coconut
c. greater on the feather - ANSWER-b
Horses with the greatest linear speed on a merry go round are located
a. near the outside
b. anywhere, because they all move at the same speed
c. near the center - ANSWER-a
Toss a baseball bat into the air and it wobbles about its
a. geometrical center
b. heavier end
c. center of mass - ANSWER-c
A ball rolling down an incline has its maximum potential energy at
a. the top
b. the bottom
, c. a quarter of the way down
d. halfway down - ANSWER-a
An educated scientific guess is
a. theory
b. hypothesis
c. either of these
d. neither of these - ANSWER-b
A car traveling at 100 km/h strikes an unfortunate bug and splatters it. the force of impact is
a. the same for both
b. greater on the bug
c. greater on the car - ANSWER-a
If a stone falls to the bottom of a mineshaft in 6 seconds, then the depth of the shaft is about
a. 60m
b. more than 200 m
c. 180 m
d. 120 m - ANSWER-c
If a rocket initially at rest accelerates at a rate of 50 m/s^2 for one minute, its speed will be
a. 500 m/s
b. 50 m/s
c. 3600 m/s
d. 3000 m/s - ANSWER-d
A clerk can lift cylindrical packages 1 meter vertically, or can roll them up a 2 meter long ramp to the same
elevation. With the ramp, the applied force required is about
a. the same
b. twice as much
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED
A+||BRAND NEW
A skydiver's terminal velocity will be greatest if she falls
a) lying flat on her stomach.
b) lying flat on her back.
c) with her parachute open.
d) head first. - ANSWER-d
Padded dashboards in cars are safer in an accident than non-padded ones because passengers hitting
the dashboard encounter
a. shorter time of contact
b. lengthened time of contact
c. decreased impulse
d. increased momentum - ANSWER-b
Two identical objects in outer space, one moving at 2 m/s, the other at 1 m/s, have a head-on collision
and stick together. Their combined speed after the collision is
a. 1 m/s
b. 0.67 m/s
c. 0.33 m/s
d. none of the above - ANSWER-d
What is the acceleration of a car that starts from rest and 5 seconds later reaches a speed of 20 m/s?
a. 1 m/s
b. 2 m/s
c. 3 m/s
d. 4 m/s
,e. 5 m/s - ANSWER-d
A block pulled to the left with 15 N and to the right with 5 n at the same time experiences a net force of
a. 5 N
b. 20 N
c. 15 N
d. 10 N - ANSWER-d
Joshua is attracted to earth by a 500 N gravitational force. The Earth is attracted toward Joshua with a
force of
a. 0
b. 250 N
c. 500 N
d. 1000 N - ANSWER-c
The chef at the infamous Fattening Tower of Pizza tosses a spinning disk of uncooked pizza dough into
the air. The disk becomes wider during its flight, while its rotational speed
a. slows
b. quickens
c. remains constant - ANSWER-a
The average braking force of a 1000 kg car moving at 10 m/s braking to a stop in 5 s is
a. 3000 N
b. 1000 N
c. 5000 N
d. 2000 N
e. 4000 N - ANSWER-d
the distance a freely falling bowling ball falls each second
a. is about 10 m
,b. is about 5 m
c. increases
d. none of the above - ANSWER-c
A ring and a disk both at rest roll down a hill together. Which accelerates slower?
a. both roll at the same speed
b. ring
c. depends on the masses
d. disk
e. need more information - ANSWER-b
A coconut and a bird's feather fall from a tree through the air to the ground below. The force of air
resistance is
a. the same on each
b. greater on the coconut
c. greater on the feather - ANSWER-b
Horses with the greatest linear speed on a merry go round are located
a. near the outside
b. anywhere, because they all move at the same speed
c. near the center - ANSWER-a
Toss a baseball bat into the air and it wobbles about its
a. geometrical center
b. heavier end
c. center of mass - ANSWER-c
A ball rolling down an incline has its maximum potential energy at
a. the top
b. the bottom
, c. a quarter of the way down
d. halfway down - ANSWER-a
An educated scientific guess is
a. theory
b. hypothesis
c. either of these
d. neither of these - ANSWER-b
A car traveling at 100 km/h strikes an unfortunate bug and splatters it. the force of impact is
a. the same for both
b. greater on the bug
c. greater on the car - ANSWER-a
If a stone falls to the bottom of a mineshaft in 6 seconds, then the depth of the shaft is about
a. 60m
b. more than 200 m
c. 180 m
d. 120 m - ANSWER-c
If a rocket initially at rest accelerates at a rate of 50 m/s^2 for one minute, its speed will be
a. 500 m/s
b. 50 m/s
c. 3600 m/s
d. 3000 m/s - ANSWER-d
A clerk can lift cylindrical packages 1 meter vertically, or can roll them up a 2 meter long ramp to the same
elevation. With the ramp, the applied force required is about
a. the same
b. twice as much
