some problems from Serway/Jewett @acollieralso

acollieralso how to teach yourself physics: youtu.be/Cw97Tj5zxvA

1.A bridge of length 50 m and mass 8x104 kg is supported on a smooth pier at each end as shown in Figure. A truck of mass 3x104 kg is located 15 m from one end. What are the force on the bridge at the point of support?
2.A block of mass m is connected to two springs of force constants k1 and k2 in two ways as shown in Figure. In both cases, the block moves on a frictionless table after it is displaced from equilibrium and released. Show that in the two cases the block exhibits simple harmonic motion with periods:
3.At what temperature would the average speed of helium atoms equal (a) the escape speed from the Earth, 1.12x104 m/s and (b) the escape speed from the Moon, 2.37x103 m/s? Note: The mass of the helium atom is 6.64x10-27 kg.
4.A piece of insulated wire is shaped into a figure 8 as shown in Figure. The radius of the upper circle is 5 cm and the radius of the lower circle is 9 cm. The wire has a uniform resistance per unit length of 3 Ω/m. A uniform magnetic field is applied perpendicular to the plane of the two circles, in the direction shown. The magnetic field is increasing at a constant rate of 2 T/s. Find the magnitude and direction of the induced current in the wire.
5.Two light pulses are emitted simultaneously from a source. Both pulses travel to a detector, but mirrors shunt one pulse along a path that carries it through 6.2 m of ice along the way. Determine the difference in the pulses time of arrival at the detector.
6.Steven Chu, Claude Cohen-Tannoudji, and William Phillips received the 1997 Nobel Prize in Physics for ‘the development of methods to cool and trap atoms with laser light.’ One part of their work was with beams of atoms (mass ~ 10-25 kg) that move at a speed on the order of 1 km/s, similar to the speed of molecules in air at room temperature. An intense laser light beam tuned to a visible atomic transition (assume 500 nm) is directed straight into the atomic beam; that is, the atomic beam and light beam are traveling in opposite directions. An atom in the ground state immediately absorbs a photon. Totally system momentum is conserved in the absorption process. After a lifetime on order of 10-8 s, the excited atom radiates by spontaneous emission. It has an equal probability of emitting a photon in any direction. Therefore, the average ‘recoil’ of the atom is zero over many absorption and emission cycles. (a) Estimate the average deceleration of the atomic beam. (b) What is the order of magnitude of the distance over which the atoms in the beam are brought to a halt?

updated 9 months ago

some problems from Serway/Jewett

acollieralso 2023-12-30 | how to teach yourself physics: youtu.be/Cw97Tj5zxvA

1.A bridge of length 50 m and mass 8x104 kg is supported on a smooth pier at each end as shown in Figure. A truck of mass 3x104 kg is located 15 m from one end. What are the force on the bridge at the point of support?
2.A block of mass m is connected to two springs of force constants k1 and k2 in two ways as shown in Figure. In both cases, the block moves on a frictionless table after it is displaced from equilibrium and released. Show that in the two cases the block exhibits simple harmonic motion with periods:
3.At what temperature would the average speed of helium atoms equal (a) the escape speed from the Earth, 1.12x104 m/s and (b) the escape speed from the Moon, 2.37x103 m/s? Note: The mass of the helium atom is 6.64x10-27 kg.
4.A piece of insulated wire is shaped into a figure 8 as shown in Figure. The radius of the upper circle is 5 cm and the radius of the lower circle is 9 cm. The wire has a uniform resistance per unit length of 3 Ω/m. A uniform magnetic field is applied perpendicular to the plane of the two circles, in the direction shown. The magnetic field is increasing at a constant rate of 2 T/s. Find the magnitude and direction of the induced current in the wire.
5.Two light pulses are emitted simultaneously from a source. Both pulses travel to a detector, but mirrors shunt one pulse along a path that carries it through 6.2 m of ice along the way. Determine the difference in the pulses time of arrival at the detector.
6.Steven Chu, Claude Cohen-Tannoudji, and William Phillips received the 1997 Nobel Prize in Physics for ‘the development of methods to cool and trap atoms with laser light.’ One part of their work was with beams of atoms (mass ~ 10-25 kg) that move at a speed on the order of 1 km/s, similar to the speed of molecules in air at room temperature. An intense laser light beam tuned to a visible atomic transition (assume 500 nm) is directed straight into the atomic beam; that is, the atomic beam and light beam are traveling in opposite directions. An atom in the ground state immediately absorbs a photon. Totally system momentum is conserved in the absorption process. After a lifetime on order of 10-8 s, the excited atom radiates by spontaneous emission. It has an equal probability of emitting a photon in any direction. Therefore, the average ‘recoil’ of the atom is zero over many absorption and emission cycles. (a) Estimate the average deceleration of the atomic beam. (b) What is the order of magnitude of the distance over which the atoms in the beam are brought to a halt?

wildly biased interview increased book sales

acollieralso 2024-10-17 | This is a review of The Message by Ta-Nehisi Coates.

Palestinian Children’s Relief Fund: pcrf.net

CBS Mornings Interview: youtube.com/watch?v=qgWt-QcPYMo

Ta-Nehisi Coates on the Daily Show:
youtube.com/watch?v=d0-y0X51Xtw

Ta-Nehisi Coates on Trevor Noah’s podcast:
youtube.com/watch?v=IPbD9PZ5FP4

00:00 Introduction

01:00 The Interview

16:50 Book Review of The Message

26:39 A bad thing.

fall book list (and first DNF of the year!)

acollieralso 2024-10-03 | Books in this video:
Howl’s Moving Castle by Jones
The Halloween Tree by Bradbury
A Wizards Guide to Defensive Baking by Kingfisher
The Legend of Sleepy Hollow by Irving
Practical Magic by Hoffman
The Ghost in the House by O’Leary
Penance by Clark
The Final Girl Support Group by Hendrix
Pet Semetery by King
The Postmortal by Magary
The Haunting of Hill House by Jackson

a ghost in the house

acollieralso 2024-09-24 | Books mentioned:
A Ghost in the House by Sara O’Leary
Outline by Rachel Cusk

Podcast mentioned: @BooksUnbound

Main channel: @acollierastro
Link to Patreon — one exclusive science video per month:
patreon.com/acollierastro

I have merch: store.dftba.com/collections/angela-collier

Chapters:
00:00 Introduction
01:28 The Pitch
02:38 Thoughts (no spoilers)
05:33 Spoilers and a story time
09:43 Outline by Rachel Cusk

shame stack afraid to leave the stack

acollieralso 2024-09-06 | Shame stack TBR!
Pile 1:
There There by Tommy Orange
The Grapes of Wrath by John Steinbeck
How to Suppress Women’s Writing by Joanna Russ
Hope in the Dark by Rebecca Solnit
The Year of Magical Thinking by Joan Didion
The Hours by Michael Cunningham
Stoner by John Williams
Arcadia by Tom Stoppard

Pile 2:
By Any Means Necessary by Malcolm X
Twelve Years a Slave by Solomon Northup
Say Nothing by Patrick Radden Keefe
The Rape of Nanking by Iris Chang
The Things They Carried by Tim O’Brien

Pile 3:
Woman at Point Zero by Naval El Saadawi
Kappa by Ryunosuke Akutagawa
The Golem by Gustav Mayrink
China in Ten Words by You Hua
Storm by George R. Stewart
Sense & Sensibility The Diaries by Emma Thompson

Pile 4:
Master and Commander by Patrick O’Brien
Remains of the Day by Kazuo Ishiguro
Lucy by the Sea by Elizabeth Strout

Pile 5:
A Swim In A Pond In The Rain by George Suanders
So Long A Letter by Mariana BäThe Fire Next Time by James Baldwin
Severance by Ling Ma

Link to Patreon — one exclusive science video per month:patreon.com/acollierastro

I have merch: store.dftba.com/collections/angela-collier

00:00 Introduction
01:35 Recommendations from Booktube and real life.
06:42 Books I should read to learn but they will make me feel sad.
10:11 Books I know nothing about but seem interesting.
14:11 I bought these books for weird reasons.
16:26 Books I know that I will like.

if your satire fails you just made the thing

acollieralso 2024-08-30 | Books in this video:The Final Girl Support Group — Grady Hendrix
The Bitter Southerner: bittersoutherner.com
The story— Woman in the Woods by Holly Hayworth
The English Understand Wool — Helen DeWitt

new books new me

acollieralso 2024-08-01 | Books mentioned in this video:
Sipsworth by Simon Van Booey
The Once and Future Sex by Eleanor Jangea
All Fours by Miranda July
Moonbound by Robin Sloan
Sourdough by Robin Sloan
Mr Prenumbra’s 24-Hour Bookstore by Robin Sloan
The Final Girl Support Group by Grady Hendrix
Horrorstör by Grady Hendrix
The Last Sane Woman by Hannah Regal
Peach by Amanda Green

I have merch: store.dftba.com/collections/angela-collier

Books that feel like the Twilight Zone

acollieralso 2024-07-11 | #booktube
Books mentioned:

A Short Stay in Hell by Steven L. Peck

The Mustache by Emmanuel Carrère

The Factory by Hiroko Oyamada

The Yellow Wallpaper by Charlotte Perkins Gilman

The Hike by Drew Magary

Redshirts by John Scalzi

reading classic books to convince people Im smart

acollieralso 2024-06-28 | Age of Innocence by Edith Wharton

Orlando by Virginia Woolf

The Master and Margarita by Mikhail Bulgakov

O Pioneers! by Willa Cather

Pudd'nhead Wilson by Mark Twain

Mrs. Dalloway by Virginia Woolf

Something Wicked this Way Comes by Ray Bradbury

Of Mice and Men by John Steinbeck

Gentleman Prefer Blondes by Anita Loos

The Yellow Paper by Charlotte Perkins Gilman

True Grit by Charles Portis

Despair by Vladimir Nabokov

Grendel by John Gardner

reading classic sci-fi until the world makes sense

acollieralso 2024-06-12 | Canticle Review: youtu.be/WxZp9soM6U4

Stepford Review: youtu.be/womJxiWG6Q0

Link to Patreon — one exclusive video per month:patreon.com/acollierastro

I have merch: store.dftba.com/collections/angela-collier

#booktube

the scariest book scene

acollieralso 2024-05-16 | In this video:

The Handmaid's Tale by Margaret Atwood (1985)

Why Don't Worry Darling Doesn't Work by @Princess_Weekes
Link: youtube.com/watch?v=VDN7YTBuaNY

The Stepford Wives by Ira Levin (1972)

#booktube

this book made me mad though

acollieralso 2024-05-05 | Big recommend.

A Canticle for Liebowitz by Walter M. Miller Jr (first published in 1957)

#booktube

amazon is ruining books and readers will not escape

acollieralso 2024-04-22 | I talk about that book in this video: youtube.com/watch?v=DM5qBRwU5EU

The book is fine. The copy I have is absolute garbage.

#booktube

google sucks now

acollieralso 2023-12-05 | ...