100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
PHY 111 Midterm Questions With Complete Solutions $12.99   Add to cart

Exam (elaborations)

PHY 111 Midterm Questions With Complete Solutions

 5 views  0 purchase

PHY 111 Midterm Questions With Complete Solutions

Preview 3 out of 18  pages

  • August 23, 2024
  • 18
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
All documents for this subject (9)
avatar-seller
Classroom
PHY 111 Midterm Questions With Complete Solutions

You could solve this graphically, but you will use algebra for
this example.

Solve for all the velocity vector components. The first vector is
the plane's initial velocity vector.

cos angle = adjacent / hypotenuse
cos 25 = vx / (246 m/s)
vx = 223 m/s

The plane is traveling 223 m/s to the east.

sin angle = opposite / hypotenuse
sin 25 = vy / (246 m/s)
vy = 104 m/s

The plane is traveling 104 m/s to the north.

Plane velocity = <223, 104> m/s

The second vector is the velocity from the wind:

Velocity due to wind = <0, 40 m/s>

The final plane speed is the vector sum of these two velocities:

Σvx = (223 m/s) + (0 m/s) = 223 m/s
Σvy = (104 m/s) + (40 m/s) = 144 m/s

,Final airplane velocity = <223, 144> m/s

Solve for the final velocity magnitude using Pythagorean
theorem and the direction using trig:

a2 + b2 = c2
(223 m/s)2 + (133 m/s)2 = v2
v = 260 m/s
Tanθ = (144 m/s) / (223 m/s)
θ = 33°

The plane's velocity with the tailwind is 260 m/s at 33°

`Equation for volume Correct Answers Volume = length x
width x height

a = Correct Answers = Δv / Δta
= (final velocity - initial velocity) / change in time

A 5.0 kg box accelerates down a 20° ramp with negligible
friction. What is the acceleration of the box? Correct Answers
W = mg = (5 kg)(9.8 N/kg) = 49 N
W┴ = (49 N)(cos 20) = 46 N
W// = (49 N)(sin 20) = 16.8 N

For this problem you only need to consider the forces parallel to
the ramp (the direction the box accelerates).
ΣF// = ma
W// = ma
(16.8 N) = (5.0 kg)(a)

, a = 3.36 m/s/s at -30° (along the surface of the ramp)

A box has a mass of 15 kg. What is the weight of the box?
Report the answer in both newtons and pounds. Correct
Answers W = mg
W = (15 kg)(9.8 N/kg)
W = 147 N

There are 4.4 N = 1lb
(147 N)(1 lb / 4.4 N) = 33.4 lb

A car moves forwards at a speed of 20 m/s for 5 seconds. What
is the distance the car has traveled? What is its displacement?
Correct Answers x = vt + xox - xo = (20 m/s)(5 s)Δx = 100 m
forwards

A car moving at a speed of 10 m/s slows to a stop over a
distance of 30 m. What was the acceleration of the car? Correct
Answers v2 = 2aΔx + vo2
0 = 2(a)(30 m) + (10 m/s)^2
a = -1.7 m/s2

A car moving at a speed of 20 m/s slows to a stop over 5
seconds. What is the acceleration of the car? Correct Answers
v = at + vo
0 = (a)(5 s) + (20 m/s)
a = -4 m/s/s

A car traveling at a speed of 20 m/s slows at a rate of 5 m/s/s for
2 seconds. How far did the car travel while stopping? Correct
Answers x = 1/2at2 + vot + xo

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 Classroom. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $12.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

71498 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
$12.99
  • (0)
  Add to cart