100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
PHYS 204-Sections EC & EC2 Final Exam 2023 with well detailed and explained solutions;100% Correct CA$19.28   Add to cart
Quickly navigate to
Preview
  2.  
  3. Concordia Theological Seminary-Fort Wayne
  4.  
  5. PHYS 204

Exam (elaborations)

PHYS 204-Sections EC & EC2 Final Exam 2023 with well detailed and explained solutions;100% Correct
 16 views  0 purchase

PHYS 204-Sections EC & EC2 Final Exam 2023 with well detailed and explained solutions;100% Correct

Preview 2 out of 10  pages

Document information

  • November 14, 2023
  • 10
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

Subjects

  • phys 204
  • phys 204 sections ec ec2 final exam 2023 with we
  • 2 marks in a mass spring system a block oscillat
  • a cylinder with mass length and radius
  • in car accidents how do airbags save passengers

Written for

All documents for this subject (1)

Seller

avatar-seller
Wiseman

Reviews received

Content preview

Final Examination

Course: PHYS 204-Sections EC & EC2
Date: December 09/2020
Exam time: 14:00 – 16:00
Instructor: Seyyed Nima Nateghi


Multiple Choice
1. (2 marks) In a mass-spring system, a block oscillates with simple harmonic motion along
the x axis. Its displacement varies with time according to the equation 𝑥 = 5 cos(𝜋𝑡).
The magnitude of the acceleration of the body at t = 1 second is approximately:
a) 3.5 m/s2
b) 49 m/s2
c) 14 m/s2
d) 43 m/s2
e) 4.3 m/s2


2. (2 marks) A cylinder with mass 𝑚, length 𝐿, and radius 𝑅 is placed next to a disk with
mass 𝑚 and radius 𝑅 on an incline surface. If we let them roll down, which one will have
a higher speed at the bottom of the incline surface? Ignore the effect of resistive forces.
Assume that the cylinder and the disk roll without sliding. We have (𝐼 𝐶𝑀 )𝐷𝑖𝑠𝑘 =
1
(𝐼𝐶𝑀 )𝐶𝑦𝑙𝑖𝑛𝑑𝑒𝑟 = 𝑚𝑅2 .
2
a) Cylinder
b) Disk
c) They will have the same speed
d) Cannot be determined

3. (2 marks) In car accidents, how do airbags save passenger’s life?
a) They decrease the change in momentum of the passenger, compared to a car with no
air bag
b) They increase the interaction time during which the passenger is brought to rest and
hence decrease the force applied on the passenger
c) Airbags do not affect the force applied on the passenger, they only allow more time
for the body to adapt to this force.




1

, 4. (2 marks) In a figure skating tournament, Alice is spinning with her
arms fully stretched. Suddenly, a bird sits on her hand. What happens
to her angular speed?
a) It increases
b) It decreases
c) It remains constant


5. (2 marks) If a tennis ball and a bowling ball have the same momentum, which one has a
larger kinetic energy?
a) The bowling ball
b) The tennis ball
c) They have the same kinetic energy


6. (2 marks) In a mass-spring system in simple harmonic motion, a block moves back and
forth along the x-axis from 𝑥 = – 𝐴 to 𝑥 = +𝐴 with period 𝑇. If at time 𝑡 = 0 it is at 𝑥 =
3
0 and is moving in +𝑥 direction, which one is true at 𝑡 = 4 𝑇?
a) it is at 𝑥 = 0 and is traveling toward 𝑥 = +𝐴
b) it is at 𝑥 = 0 and is traveling toward 𝑥 = −𝐴
c) it is at 𝑥 = +𝐴 and is at rest
d) it is at 𝑥 = −𝐴 and is at rest
e) it is between 𝑥 = 0 and 𝑥 = −𝐴 and is traveling toward 𝑥 = −𝐴

7. (2 marks) A 5-kg mass is suspended by a string from the ceiling of an elevator that is
moving upward with a speed which is decreasing at a constant rate of 2 m/s in each
𝑚
second. What is the tension in the string supporting the mass? Take 𝑔 = 10 𝑠 2.
a) 50 N
b) 40 N
c) 60 N
d) 10 N
e) 45 N

8. (2 marks) A ball of mass 𝑚 is released from rest from a
height of 7 𝑚 on a frictionless inclined surface. Calculate
the velocity of its center of mass if it rolls down the
inclined surface without slipping (Although the surface is
𝑚
frictionless, assume that the ball rolls). Take 𝑔 = 10 𝑠 2.
2
𝐼𝐶𝑀 = 5 𝑚𝑅2 .
𝑚
a) 10 𝑠

2

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller Wiseman. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for CA$19.28. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

82871 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling

Recently viewed by you

Exam (elaborations) ·

(0)

NURS 6050: POLICY AND ADVOCACY FOR IMPROVING POPULATION HEALTH  Module 1  Introduction
CA$19.28
  • (0)
  Add to cart