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
StraighterLine PHY 250 General Physics Latest Exam With Verified Questions & Answers CA$31.06   Add to cart
Quickly navigate to
Preview
  2.  
  3. StraighterLine PHY 250Physics
  4.  
  5. StraighterLine PHY 250Physics

Exam (elaborations)

StraighterLine PHY 250 General Physics Latest Exam With Verified Questions & Answers

1 review
 133 views  3 purchases
  • Course
  • StraighterLine PHY 250Physics
  • Institution
  • StraighterLine PHY 250Physics

StraighterLine PHY 250 General Physics Latest Exam With Verified Questions & Answers What is the acceleration of a skydiver at terminal velocity whose mass is 80 kg and cross-sectional area is 14 m2. The density of the air he is fallingthrough is 0.9984 g / m3. The drag coe_cient has a value of...

[Show more]

Preview 4 out of 46  pages

Document information

  • June 26, 2023
  • 46
  • 2022/2023
  • Exam (elaborations)
  • Questions & answers

Subjects

  • straighterline phy 250
  • straighterline phy 250 general physics latest exa
  • straighterline phy 250 general physics latest
  • straighterline phy 250 general physics
  • straighterline phy 250 general

Written for

  • StraighterLine PHY 250Physics
All documents for this subject (1)

1  review

review-writer-avatar

By: mzstrong03 • 7 months ago

Seller

avatar-seller
BESTEXAMINER1

Reviews received

Content preview

StraighterLine PHY 250 General
Physics Latest Exam With
l Verified Questions &Answers
PHY250_TW | Chapter 3: Dynamics




Question 1
What is the acceleration of a skydiver at terminal velocity whose mass is 80 kg and cross-sectional area is 14 m2. The density of the air he is fallingthrough is 0.9984 g /
Correct m3. The drag coe_cient has a value of 0.485.
6.00 points outof
6.00 Select one:
a. 15.2 m /sec2
b. 56.4 m /sec2
c. 0 m /sec2
d. 481 m /sec2
e. None of the above



The correct answer is: 0 m /sec2




Question 2 1 2
Calculate x = vt + at , where v = 0.227 m/s, t = 11.1s, and a = 9.80 m/s2 .
Incorrect
2

0.00 points outof
6.00
Select one:
a. 606.2487 m
b. 606 m
c. 605.5 m
d. 606.249 m


The correct answer is: 606 m




Question 3
Which of the following statements concerning an object in free fall through the atmosphere is incorrect?
Correct

6.00 points outof Select one:
6.00 a. Air resistance opposes the motion of an object moving through air and exists because a moving object collides with air molecules.
b. The speed of a falling object increases due to the frictional force of air drag.
c. Given two spherical objects made of the same material and dropped from the same height, the one with the larger cross-sectional area willexperience
increased air resistance.
d. When the magnitude of the air drag equals that of the object's weight, the net force on the object is zero. The object then falls with amaximum
constant velocity called the terminal velocity.



The correct answer is: The speed of a falling object increases due to the frictional force of air drag.

, StraighterLine PHY 250 General
Physics Latest Exam With
l Verified Questions &Answers
Question 4 A woman drives 2 blocks north, stops, continues on for another 4.5 blocks, and then makes a U-turn and drives south 3.25 blocks. After stoppingmomentarily she
Correct drives 5.75 blocks north. Which of the following is the magnitude of the woman’s displacement and distance traveled?
6.00 points outof
6.00 Select one:
a. Displacement: 15.5 blocks
Distance: 15.5 blocks
b. Displacement: 15.5 blocks
Distance: 9 blocks
c. Displacement: 9 blocks
Distance: 15.5 blocks
d. Displacement: 9 blocks
Distance: 9 blocks



The correct answer is: Displacement: 9 blocks
Distance: 15.5 blocks




Question 5
Which of the following is a correct statement concerning the velocity of a particle in uniform circular motion?
Correct

6.00 points outof Select one:
6.00 a. The velocity is in the same direction as the angular velocity.
b. The velocity is directed radially inward.
c. The velocity is in the same direction as the centripetal acceleration.
d. The velocity is constantly changing directions.



The correct answer is: The velocity is constantly changing directions.




Question 6
Why is A · B = AxBx + AyBy
Incorrect

0.00 points outof
6.00
Select one:
a. It isn’t.
b. All the cross-terms are equal to zero.
c. The vectors are 90° apart.
d. The vectors are pointing in the same direction.



The correct answer is: All the cross-terms are equal to zero.
An airplane travels 600 m down a runway for take off. It starts from rest and moves with constant acceleration. It is in the air in 23 s. What is itsspeed when it takes
off?

Select one:
Question 7 a. 7.2 m /s
Correct b. 2.3 m /s
6.00 points outof c. 52 m / s
6.00
d. There is not enough information provided to answer the question.

, StraighterLine PHY 250 General
Physics Latest Exam With
l Verified Questions &Answers
The correct answer is: 52 m /s

, Question 8 Two children are playing catch in a passenger train. An observer on the ground measures that the train is traveling at 70 mph. As the train passes the observer, he
Correct measures that the ball is thrown with half of the speed as the passenger train. What velocity do the children measure for the ball?(Assume the positive direction is
6.00 points outof
the direction in which the train is moving.)
6.00
Select one:
a. −105 mph
b. −70 mph
c. −35 mph
d. 105 mph



The correct answer is: −35 mph




Question 9
What is the scalar product of two perpendicular vectors?
Correct

6.00 points outof Select one:
6.00 a. the total of their magnitudes
b. the product of their magnitudes
c. zero
d. the difference of their magnitudes



The correct answer is: zero




Question 10 An airplane has an initial velocity with respect to the ground of 200 mph in an eastward direction. A strong wind begins to blow with a velocity of 80mph from north to
Correct south. What are the x-and y-components of the total velocity of the plane when the wind is taken into account? Let north be the positive y-direction and east be the
6.00 points outof
positive x-direction.
6.00
Select one:
a. vx = +200 mph
vy = +80 mph
b. vx = +200 mph
vy = −80 mph
c. vx = +80 mph
vy = +200 mph
d. vx = +215 mph
vy = −80 mph



The correct answer is: vx = +200 mph
vy = −80 mph




Question 11
Consider a basket with 3.046 kg of fruit. When you weigh the whole package (fruit + basket), the reading on the scale is 4.2 kg. What is the mostrealistic weight of the
Correct basket alone?
6.00 points outof
6.00 Select one:
a. 1.2 kg
b. 1.154 kg
c. 1.15 kg
d. 1 kg



The correct answer is: 1.2 kg

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 BESTEXAMINER1. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for CA$31.06. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

78252 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
CA$31.06  3x  sold
  • (1)
  Add to cart