Docsity
Log inSign up
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search Store documents

The best documents sold by students who completed their studies

Search through all study resources
Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

University Rankings

Discover the best universities in your country according to Docsity users

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

From our blog

Exams and Study
Go to the blog

Net Torque - Physics - Exam Paper, Exams of Physics

Banasthali VidyapithPhysics

These are the notes of Exam Paper of Physics. Key important points are: Net Torque, Positive Torques, Moment of Inertia, Constant Torque, Angular Speed, Total Kinetic Energy, Youngs Modulus of Steel

Typology: Exams

2012/2013

Uploaded on 02/08/2013

sheth_kim55
sheth_kim55 🇮🇳

4

(2)

62 documents

1 / 6

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Physics 124 - Analytical Physics
FIRST COMMON HOUR EXAM
Monday, Feb. 23, 2009
Professor Ron Gilman
⇒⇐
Your name sticker with exam code. SIGN HERE NOW:
1. The exam will last from 9:40 - 11:00 p.m. Use a #2 pencil to make entries
on the answer sheet. Enter the following ID information, items 2-5,
now, before the exam starts...
2. In the section labeled NAME (Last, First, M.I.) enter your last name, then
fill in the empty circle for a blank, then enter your first name, another
blank, and finally your middle initial.
3. Under STUDENT # enter your 9-digit RUID Number.
4. Enter 124 under COURSE; you may ignore the section number.
5. Under CODE enter the exam code given above.
6. During the exam, you may use pencils, a calculator, and one 8.5 x 11 inch
sheet (both sides) with formulas and notes.
7. There are 15 multiple-choice questions on the exam. For each question,
mark only one answer on the answer sheet. There is no deduction of points
for an incorrect answer, so even if you cannot work out the answer to a
question, you should make an educated guess. At the end of the exam,
hand in the answer sheet and this SIGNED cover page. Retain the
exam questions attached for future reference and study.
8. When you are asked to open the exam, make sure that your copy contains
all 15 questions. Raise your hand if this is not the case, and a proctor will
help you. Also raise your hand during the exam if you have a question.
9. Please have your student ID ready to show to the proctor during the exam.
10. Possibly useful constants: the acceleration due to gravity on the earth’s
surface is g = 9.8 m/s2, the universal gravitational constant G = 6.67×10−11
Nm2/kg2, the mass of the Earth is 6×1024 kg, and the radius of the Earth
is 6.4×106m.
pf3
pf4
pf5

Partial preview of the text

Download Net Torque - Physics - Exam Paper and more Exams Physics in PDF only on Docsity!

Physics 124 - Analytical Physics

FIRST COMMON HOUR EXAM

Monday, Feb. 23, 2009

Professor Ron Gilman

Your name sticker with exam code. SIGN HERE NOW:

  1. The exam will last from 9:40 - 11:00 p.m. Use a #2 pencil to make entries on the answer sheet. Enter the following ID information, items 2-5, now, before the exam starts...
  2. In the section labeled NAME (Last, First, M.I.) enter your last name, then fill in the empty circle for a blank, then enter your first name, another blank, and finally your middle initial.
  3. Under STUDENT # enter your 9-digit RUID Number.
  4. Enter 124 under COURSE; you may ignore the section number.
  5. Under CODE enter the exam code given above.
  6. During the exam, you may use pencils, a calculator, and one 8.5 x 11 inch sheet (both sides) with formulas and notes.
  7. There are 15 multiple-choice questions on the exam. For each question, mark only one answer on the answer sheet. There is no deduction of points for an incorrect answer, so even if you cannot work out the answer to a question, you should make an educated guess. At the end of the exam, hand in the answer sheet and this SIGNED cover page. Retain the exam questions attached for future reference and study.
  8. When you are asked to open the exam, make sure that your copy contains all 15 questions. Raise your hand if this is not the case, and a proctor will help you. Also raise your hand during the exam if you have a question.
  9. Please have your student ID ready to show to the proctor during the exam.
  10. Possibly useful constants: the acceleration due to gravity on the earth’s surface is g = 9.8 m/s^2 , the universal gravitational constant G = 6.67× 10 −^11 Nm^2 /kg^2 , the mass of the Earth is 6× 1024 kg, and the radius of the Earth is 6.4× 106 m.
  1. Calculate the net torque about point O for the two forces applied as in Figure 1. The rod and both forces are in the plane of the page. Take positive torques to be counterclockwise.

a) 12 N·m b) -12 N·m c) 28 N·m d) -28 N·m e) -52 N·m

  1. An artist constructs the mobile shown in Figure 2. In the illustrated con- figuration, the mobile is perfectly balanced. If the artist decides to make the star twice as massive, and not change the length of any crossbar or the location of any object, what does she have to do with the mass of the smiley face to keep the mobile in perfect balance? Note that she may have to change masses of other objects to keep the entire structure balanced.

a) make it eight times more mas- sive b) make it four times more mas- sive c) make it twice times more mas- sive d) nothing e) impossible to tell

  1. The flywheel of an engine has moment of inertia 3.0 kg/m^2 about its rotation axis. What constant torque is required to bring it up to an angular speed of 10rad/s in 10s, starting from rest? a) 1.5 N·m b) 3 N·m c) 6 N·m d) 30 N·m e) 150 N·m
  1. A circular steel wire 2m long must stretch no more than 0.3cm when a tensile force of 500N is applied to each end of the wire. What minimum diameter is required for the wire? (Youngs modulus of steel is 2× 1011 Pa.)

a) 7.3× 10 −^4 m b) 1.46× 10 −^3 m c) 2.05× 10 −^3 m d) 2.91× 10 −^3 m e) 4.61× 10 −^3 m

  1. Very far from the Sun (at R ≈ ∞), a spacecraft has run out of fuel and its kinetic energy is zero. If only the gravitational force of the Sun were to act on it (neglect the forces from other solar system objects), the spacecraft would eventually crash into the Sun. The mass of the Sun is 2× 1030 kg and its radius is 7× 108 m. Find the speed of the spacecraft when it crashes into the Sun. a) 8.0× 103 m b) 1.2× 104 m c) 3.4× 104 m d) 7.8× 104 m e) 6.2× 105 m
  2. Rhea, one of Saturn’s moons, has a radius of 8× 105 m and an acceleration due to gravity of 0.3m/s^2 at its surface. At what distance above Rheas surface is the acceleration due to gravity 0.1 m/s^2? a) 1.1× 106 m b) 0.6× 106 m c) 1.8× 106 m d) 1.4× 106 m e) 3.0× 106 m
  3. The acceleration due to gravity at the north pole of a planet is 10 m/s^2. The planet has radius 25× 106 m. The apparent weight of objects at the planets equator is zero. Find the angular frequency of the planets rotation around its axis. a) 3.8× 10 −^4 rad/s b) 4.1× 10 −^4 rad/s c) 6.3× 10 −^4 rad/sm d) 8.7× 10 −^4 rad/s e) 1.2× 10 −^3 rad/s
  1. Consider a steady laminar flow of an incompressible water (ρ=1000kg/m^3 ) in a horizontal pipe with changing cross-sectional area (see Figure 5). Area 1 is 2m^2 , area 2 is 0.5m^2 , and the flow speed at point A is 1m/s. Find the pressure difference between points A and B.

a) 1.5× 103 Pa b) -1.5× 103 Pa c) 7.5× 103 Pa d) -7.5× 103 Pa e) 1.5× 104 Pa

  1. Consider the following statement: The magnitude of the buoyant force is equal to the weight of the amount of fluid that has the same total volume as the object. Under what circumstances is this statement true? a) for an object that is partially submerged in a fluid b) only for an object that floats c) for an object completely submerged in a fluid d) for no object partially or completely submerged in a fluid e) none of the above
  2. A flask of water rests on a scale that reads 100 N (see Figure 6). Then, a small block is held completely submerged in the water. The block does not touch any part of the flask, and the person holding the block will not tell you whether the block is being pulled up (keeping it from falling further) or pushed down (keeping it from bobbing back up). What is the new reading on the scale?

a) greater than 100 N b) 100 N c) between 0 N and 100 N d) less than 0 N e) it is impossible to determine.