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Unformatted text preview: Dr. Huerta Phy 101 ANSWER KEY Final Exam Form 1 8 December 2004 CORRECT CHOICES ARE MARKED BY [X]
Fall Semester 2004, Sections S and T
THIS IS FORM ONE (1)
IN THE COMPUTER GRADING SHEET MARK YOUR LAST NAME,
I.D. NUMBER, AND FORM NUMBER (FM). USE A #2 PENCIL.
BUBBLE IN YOUR BEST ANSWER FOR All 30 QUESTIONS.
EACH QUESTION IS WORTH 5 POINTS.
TURNING IN THE ANSWER SHEET WILL CONSTITUTE YOUR HONOR PLEDGE
THAT YOU HAVE NEITHER GIVEN NOR RECEIVED ANY AID ON THIS TEST.
YOU MAY ONLY USE A SIMPLE CALCULATOR, NOT CAPABLE OF STORING TEXT.
YOU MAY BE ASKED TO SHOW YOUR PHOTO ID DURING THE EXAM.
ALWAYS USE g = 10 m/s2 .
 A ﬂoating ship has a mass of 107 kg. When the ship is loaded with 3 × 106 kg of cargo,
how much more of the ship’s volume will become submerged?
[X] 3 × 103 m3 . [B] 3 × 102 m3 . [C] 10.3 × 104 m3 . [D] 3 × 103 kg. [E] 3 × 102 kg.
 A pipe carries water in steady ﬂow. The speed of the water is 0.5 m/s at a place where
the diameter is 2 inches. The pipe then splits into two thinner pipes of diameter 1 inch
each. The speed of the water in one of the thin pipes is
[A] 0.13 m/s [B] 0.25 m/s [C] 0.5 m/s [X] 1 m/s [E] 2 m/s
 A manometer consists of a U-shaped tube with water in it. One end of the U-tube is
connected to a container ﬁlled with a gas at a pressure Pgas . The other end is open to the
atmosphere. The water is 50 cm higher in the part open to the atmosphere than in the
part connected to the gas. Find the gauge pressure of the gas Pgauge ≡ Pgas − Patm .
[A] 105,000 Pa [B] -105,000 Pa [C] 95,000 Pa [X] 5 × 103 Pa [E] −5 × 103 Pa
 A jogger did 400,000 J of work and gave oﬀ 360,000 J of heat to the environment. The
change ∆U in the internal energy of the jogger was
[A] -40,000 J [B] 40,000 J [X] -760,000 J [D] 760,000 J [E] zero
 A steel tank with a volume of 50.0 gallons is ﬁlled with gasoline when the temperature is
5.00◦ C. It is ﬂown the next day to a place where the temperature is 30.0◦ C. How much
gasoline will spill from the tank if it has an escape valve? The volume expansion coeﬃcient
for gasoline is β = 950 × 10−6 ◦ C−1 ; for steel it is β = 36.0 × 10−6 ◦ C−1 .
[X] 1.14 gallons [B] 1.19 gallons [C] 1.23 gallons [D] 1.37 gallons [E] none of the above
 The Celsius and Fahrenheit temperatures will have the same numerical value when
[A] TC = −5◦ C [B] TC = 5◦ C [X] TC = −40◦ C [D] TC = 40◦ C [E] no such temperature. Physics 101 Final Exam Form 1 8 December 2004 Dr. Huerta Phy 101 ANSWER KEY Final Exam Form 1 8 December 2004  The spring in a pop gun with a spring constant of k = 100 N/m is compressed 0.1 m and
suddenly released as it pushes a 0.25 kg ball. With what speed will the ball leave the gun?
[X] 2 m/s [B] 1.4 m/s [C] 4 m/s [D] 20 m/s [E] 40 m/s
 How much sweat would have to evaporate from the body of the above jogger in problem
 to get rid of all the heat by evaporation?
[A] 0.34 kg [X] 0.16 kg [C] 0.18 kg [D] 0.018 kg [E] 0.016 kg
 A 350-gm piece of metal at 100◦ C is dropped into a 100-gm aluminum cup containing 500
gm of water at 15◦ C. the ﬁnal temperature of the system is 40◦ C. What is the speciﬁc heat
of the metal, assuming no heat is exchanged with the surroundings. The speciﬁc heat of
water is 4186 J/(kg·K) and of aluminum it is 900 J/(kg·K).
[A] 4636 J/(kg·K) [B] 3600 J/(kg·K) [C] 3300 J/(kg·K) [X] 2600 J/(kg·K)
[E] 1900 J/(kg·K)
 What volume is occupied by 2 moles of gas at 546 K and twice atmospheric pressure?
[A] 89.6 × 10−3 m3 [B] 179.2 × 10−3 m3 [C] 11.2 × 10−3 m3 [D] 22.4 × 10−3 m3
[X] 44.8 × 10−3 m3
 If you double the absolute temperature of an ideal gas, the average kinetic of the molecules
[A] is multiplied by 4 [X] is multiplied by 2 [C] is multiplied by 1
[D] is multiplied by √2 [E] is multiplied by 2
 An empty box in the shape of a cube of side L stands on the ﬂoor. The top of the box is
missing. Neglecting the thickness of the material, ﬁnd how far from the ﬂoor is the center
of mass of the box.
[A] 0.1L [B] 0.2L [C] 0.3L [X] 0.4L [E] 0.5L
 A system consisting of an ideal gas at the constant pressure of 2 × 105 Pa gains 5000 J of
heat while in the process the internal energy increases by 3000 J. Find the change ∆V in
the volume of the system.
[A] −40−2 m3 . [B] 40−2 m3 . [C] 25−2 m3 . [X] 10−2 m3 . [E] −10−2 m3 .
 A molecule of mass m collides with a wall that is normal to the x axis as shown in the
ﬁgure below. Initially the molecule has a positive x component of velocity, vx > 0. The
molecule bounces from the wall with the same vy and vz as initially, but the x component
is reversed. The molecule receives an impulse Imol , and the wall receives an impulse Iwall
due to the collision. The impulse to the wall, Iwall , is given by m ˆ
[A] − 2m|vx |x
[X] 2m|vx |x
[D] m|vx |x
[E] zero Physics 101 Final Exam Form 1 wall ˆ
[C] − m|vx |x
x 8 December 2004 Dr. Huerta Phy 101 ANSWER KEY Final Exam Form 1 8 December 2004  Circle the answer that best represents the vector Q − P in the ﬁgure below.
P [X] [B] [C] [D] Q [E]
[A] [B] [C] [D] [E]  Two cars, A and B, traveling in the opposite directions are 500 m apart. The speed of B
is 20 m/s, and the speed of A is 30 m/s. In how much time will they meet?
[A] 4 s
[B] 5 s
[X] 10 s
[D] 20 s
[E] 50 s
 The three men called A, B and C are at rest. Each man weighs 1000 N. Each man exerts
a force of 100 N toward the left against the ﬂoor. The horizontal force that C exerts on
the wall is
A [A]100N [B]200N [X]300N [D]400N C B [E]600N  A 100 kg man pulls his 50 kg dancing partner toward himself with a force of 100 N. While
she is being pulled, the force that the 50 kg woman exerts on the man is
[A] 150 N
[X] 100 N
[C] 50 N
[D] 0 N
[E] not enough information to answer.
 Three blocks of equal mass m are sliding with acceleration a on a frictionless surface. The
tension in ropes A, B, and F are
m A m B m F [A] TA = ma, TB = ma, F = ma [B] TA = ma, TB = ma, F = 2ma
[C] TA = ma, TB = ma, F = 3ma [D] TA = ma, TB = 2ma, F = 2ma
[X] TA = ma, TB = 2ma, F = 3ma
 A 100 kg man pushes a 50 kg box with an acceleration of 0.2 m/s2 along a horizontal
surface while exerting a horizontal force of 200 N. The force of friction on the box is
[A] 10 N
[X] 190 N
[C] 200 N
[D] 210 N
[E] insuﬃcient information.
 A riﬂe of mass M ﬁres a bullet of mass m and recoils. Let the kinetic energy of the bullet
in ﬂight be Kb and the kinetic energy of the recoiling riﬂe be Kr . The kinetic energies are
[A] Kr = 1 [B] Kr = −1 [C] Kr = M
[X] Kr = M
[E] Kr = M 2
 Fluid is ﬂowing steadily along a wide pipe that becomes narrower. As the ﬂuid passes from
the wide part to the narrow part
[A] the speed decreases and the pressure decreases.
[B] the speed decreases and the pressure increases.
[C] the speed increases and the pressure remains the same.
[D] the speed increases and the pressure increases.
[X] the speed increases and the pressure decreases.
Physics 101 Final Exam Form 1 8 December 2004 Dr. Huerta Phy 101 ANSWER KEY Final Exam Form 1 8 December 2004  A particle undergoes a displacement ∆r = −2x + 5y meters while it is being acted upon
by a total force F = 7x + 4y Newtons. The initial kinetic energy of the particle was 8 J.
The kinetic energy after the displacement is
[A] 6 J [X] 14 J [C] 28 J [D] 20 J [E] insuﬃcient information.  A riﬂe is aimed horizontally at the center of a target located 100 meters away. The bullet
leaves the riﬂe with a speed of 1000 m/s. How far below below the center of the target
does the bullet hit?
[X] 5 cm [B] 10 cm [C] 50 cm [D] 1 cm [E] 0 cm
 A particle with a mass of 0.5 kg is oscillating attached to a spring. Its position is given
by x(t) = (0.05 m) cos[(10 rad/s)t]. Find the maximum speed, vmax , of the particle in its
motion and the k constant of the spring. Note that x is in meters, and t is in seconds.
[A] vmax = 0.05 m/s, and k = 5 N/m [B] vmax = 0.05 m/s, and k = 100 N/m
[X] vmax = 0.5 m/s, and k = 50 N/m [D] vmax = 5 m/s, and k = 50 N/m
[E] vmax = 0.5 m/s, and k = 5 N/m
 A wheel of a car has a diameter of 2 ft. The car is moving with a speed of 60 miles/hour.
If the wheel is rolling without slipping, the angular velocity of the wheel is approximately
(1 mile = 5280 ft)
[A] 176 rad/sec [X] 840 rpm [C] 14 rad/sec [D] 44 rad/sec [E] 14 rpm
 The rigid L-shaped object in the ﬁgure below consists of three small (point) masses
connected by light (massless) rods of lengths a and b. What torque τy must be applied to
make this object rotate about the y axis with an angular acceleration αy ?
y m3 z axis out of the paper a m b
1 m x
2 [A] τy = (m1 + m2 + m3 )a2 αy [B] τy = (m2 b2 + m3 a2 )αy
[D] τy = (m1 + m3 )a2 αy [X] τy = m2 b2 αy [C] τy = m3 a2 αy  A space traveler weighs 1000 N on Earth. What will the traveler weigh on another planet
with the same mass density as the earth, but whose radius is twice that of the Earth?
[A] 1000 N [B] 500 N [C] 4000 N [X] 2000 N [E] 250 N Physics 101 Final Exam Form 1 8 December 2004 Dr. Huerta Phy 101 ANSWER KEY Final Exam Form 1 8 December 2004  A mass m hangs from a massless rope wound around a cylindrical shaft of mass M , radius
R and moment of inertia I = M R2 /2, as shown in the ﬁgure below. The mass is released
from rest and falls as the rope unwinds without slipping and the shaft rotates without
friction around its axis. Use energy considerations to ﬁnd that after the mass has fallen a
height h, the speed v is given by
R [A] v = 2gh [B] v = D] v = 2mgh
M [X] v = [C] v = 4mgh
2m + M h  An amusement park ride swings a rider of mass m on a horizontal circle of radius R with
a constant speed v as shown in the ﬁgure below. Given θ, g, R, and m, the speed v is given
θ T R
[A] v = rg sin θ
[E] v = rg [B] v = √ rg cos θ Physics 101 Final Exam Form 1 [X] v = √ v rg tan θ [D] v = rg
tan θ 8 December 2004 ...
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This note was uploaded on 10/11/2011 for the course PHY 101 taught by Professor Ashkenkai during the Fall '08 term at FIU.
- Fall '08