Physics 6A - Summer 2017
2nd Midterm - Chapters: 5-8 (50-minute exam; one 3 x 5 card allowed)
Dr. Nassar
PRINT NAME:_
Multiple-choice questions:
M1. (2.5 points) A block of weight W is pushed along a
horizontal surface at constant speed v by a force F, wh
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PRACTICE FOR SUMMER FINAL 2017
PHYSICS 6A FINAL EXAM SUMMER 2016
Dr. Nassar (two 3x5 cards allowed)
Answers
Multiple Choice: Choose the best answer (2 points each).
M1. An Atwood machine is shown below, in which a mass m 1 = 500 g on a frictionless plane
6.
16.
(a) Here is a eebodyr diagram for the box at rest on the plane. The
force afiction is a STATIC frictional force, since the box is at rest.
(31) Ifthe box were sliding down the plane, the only,r change is that
the force of iction would be a KJNETIC
E The spacecraft is at 3.00 Earth radii oor the center of the Eartln or three times as far from the
Earths center as when at the surface of the Earth. Therefore? since the force of gravity decreases as
the square of the distance, the force of gravity on t
4. The vectors for the problem are drawn approximately to scale. The
resultant has a length of and a direction north of east. If
calculations are done, the actual resultant should be 1? In at 23 norn of
east.
5. (a) See the accompanying_ (1133;113thS
_.
11. The piano is moving with a constant velocity down the plane. Fl, is the
force of the man pushing on the piano.
(a) Wiite Newtons second law on each direction for the piano. with an
acceleration of D.
ZFrzFNmgcosz ) Fzmgcos
ZzmgsinEsz >
F1, =mgsin
For a constant force, Eq. 92 can be written as sf; : am. For a constant mass object, sf: : moi.
Equate the two expressions for nii.
* is:
FM : ma? > 15"? :
m
If the skier moves to the right, then the speed will decrease, because the friction force is to
11. (a) 231mm 2ss.sx111'3m 11.235511:
(a) 35211.! ssmtv
(1:) T1512 mg Tx l'kg t kg (if last zero is net signicant)
(at) 511.11 ps and): 112112 s ones can one use a s
(a) 22.5 n 22524112145111 oncacacmacaaa22s m
(1) 2.50 gigavolts 2.5)( 109 volts 2. S vclt
3. The average velocity is given by Eq. 2.2.
?_ Ax _8.5c1n 4.3cn1_4.2cn1:-
a: 4.55(2.05) 6.55
[The average speed cannot be calculatedl To calculate the average speed, we would need to know the
actual distance traveled and it is not given. We only have the
10. (a) The 201) kg box resting on the table has the eebody diagram shown. Its weight *
is mg 2 (20.0 kg) (9.30mi?) = -. Since the box is at rest, the net force on
the box must be 0, and so the normal force must also be 196N .
o-
(b) Free-body.r diagrams
PRACTICE FOR SUMMER FINAL 2017
PHYSICS 6A FINAL EXAM SUMMER 2016
Dr. Nassar (two 3x5 cards allowed)
Answers
Multiple Choice: Choose the best answer (2 points each).
M1. An Atwood machine is shown below, in which a mass m1 = 500 g on a frictionless plane i
Physics 6A 2nd Midterm
Summer 2016
Practice
Dr. Nassar (50-minute exam - One 3 x 5 card is allowed)
NAME:_
Multiple Choice: Choose the best answer (2.5 points each).
M1. (2.5 points) An object is attached to a spring and oscillates with amplitude A and
pe
ANSWERS
Physics 6A - 1st Midterm 2017
Dr. Nassar (one 3 x 5 card with notes is allowed)
NAME:_
MULTIPLE-CHOICE QUESTIONS:
M1. At its peak of flight (point A), which of the following is
true, neglecting air resistance? Choose two answers.
(a)
(b)
(c)
(d)
(
Physics 6A - Spring 2017
M E #2
READ THIS BEFORE YOU BEGIN
You are allowed to use only yourself and a writing instrument on this exam.
If you finish more than 5 minutes before the end of the exam period, please raise your
hand and a proctor will collect
4/9/17
How do we know if a
popula4on is evolving?
Microevolu*on:
a change in the rela4ve frequencies of alleles
or genotypes in a gene pool over 4me
[email protected]:/evolu4on.berkeley.edu
Mechanisms
of Evolu4on
1.Natural Selec4on
2.Gene Flow
3.Muta4on
4.G
Physics 6A
Practice Midterm Exam #2
Spring 2017
READ THIS BEFORE YOU BEGIN
Complete this practice exam in 50 minutes to get an accurate feel for exam day. We recommend
completing the exam in the recommended time, then going over your answers without a ti
Physics 6A - Spring 2017
M E #1
READ THIS BEFORE YOU BEGIN
You are allowed to use only yourself and a writing instrument on this exam.
If you finish more than 5 minutes before the end of the exam period, please raise your
hand and a proctor will collect
5/13/17
Phylogeny of Major
Animal Phyla
Choanoflagellates
Fungi
ANIMALIA
Porifera
(sponges)
Choanoflagellates
ANIMALIA
Based on DNA sequence data.
Multicellularity
Ctenophora
(comb jellies)
Cnidaria
(jellyfish, corals,
sea anemones)
Diploblasty
Acoela
5/9/17
Fungi
Mushrooms, Sac Fungi, Lichens,
Yeast, Molds, Rusts, Etc.
superkingdom
Opisthokonta
Fungal Morphology
hyphae are filaments used for taking in materials
1
5/9/17
Fungal Morphology
fungi are eukaryotic, byt they have pores in their hypha
5/28/17
Ecology
The study of the rela5onships of organisms
to one another and to their environment
Where organisms are found (distribu5on)
How many occur there (abundance)
WHY they occur where they do Causa5on
Interac5ons between abio+c & bio+c
Physics 6A Spring 2017
Midterm 2 Rubric
Problem
1a
1b
1c
2ai
2aii
2aiii
2b
2c
2d
2e
2f
2g
Item
Correctness of ranking
Recognition that Favg = m v / t or equivalent
but ranking only depends on v / t since masses same
computations and/or reasoning justifyin
Rachel Elsanadi
Name _
Chemsitry 14A
Name _
Session 9: 11/2/15
HOMONUCLEAR MOLECULAR ORIBTAL DIAGRAMS
Quantum theories of bonding regard which types of bonds? Covalent/ionic/metallic (circle one)
These theories include molecular orbitals and hybridizatio