Why do nearly all the naturally occurring isotopes lie above the N = Z line in the figure below?
The points on the chart representing stable nuclides define rather narrow stability region. For the mass numbers, the
numbers of protons and neutrons are appr
Name: 611 751: bg t Lecture Section: El Sam 53 11am [:1 2pm 52?
PHYS 141- Written Homework #07 -
Due Date: 11:59pm On Wednesday, October 12, 2016 -
For full credit, clear, legible, and correctly-rotated pages must be submitted to the correct location.
1.
Name: All 1&1th
4. (4 points) Of the 3 standards for the fundamental units discussed in section 1.3, which
standard does NOT meet the ideal criteria of being widely available?
Total Score a
you are more carefree about the egg drop.
55 it straight-up at a casual speed of
elease the egg?
2. (6 points) Repeat Problem 2.70, but this time,
Rather than simply releasing it from your hand, you to
1.41 m/s. In this case, where should the professor be
3. (8 points (Like 2.88) In a relay race, runner #1 (already in motion) must hand a baton to
runner #2 (who is waiting as runner #1 completes the first part of the race). Runner #1 is
moving at a constant speed v; 2 8.47 m/s. Runner #2 begins from rest, a
. L-nv
Name; H2! ZMZQi Section: :1 Barn Id 11am E! 2pm $3.
PHYS 141 - Written Homework #01
Due Date: 11:59pm on Wednesday, August 31, 2016
All remaining Written Homework assignments are for credit. Black ink is recommended for a clear Pdf
submission; uncl
Name: HI: FRI/70 SectionctlBam I11am [32pm l:|
PHYS 141 - Written Homework #03
Due Date: 11:59pm on Wednesday, September 14, 2016 _
Black ink ls recommended for a clear pdf submission; unclear work cannot receive credit.
1. (8 points) Solve problem 3.52 i
m, an Farina/l" _ Section; Beam lttam apm
PHYS 141 - Written Homework #00
Due Date: 11:59pm on Friday. August 26. 2018
This assignment is not for credit. Rather. it is practice for using the Crowdmark grading
system. It will be practice-run for everyone:
2. (6 points) Consider problem 3.71:
3.71 " An airplane pilot sets a compass course due west and
- maintains an airspeed of 220 km/h. After flying for 0.500 h. she
finds herself over a town 120 km west and 20 km south of her
starting position. Helpil info
3. (6 pts) Solve this problem using work-energy methods.
Let f (x) = 50.0N - (2.30%): represent a force applied to a 52 kg skater as she slides on
frictionless ice, initially at the origin and at rest. What would be her speed after moving 7 m in
the posit
Name: in" hair LectureSeciion:E38em I11Im L'l2pm
PH 141 - Written Homework #05
Due Date: 11:59pm on Wednesday, September 28, 2016 . 1- ,
Black Ink is recommended for a clear pdf submission. All four pages must be submitted, and In order!
- cfw_319(le .
23
3. (8 pts) (Like 7.19) A spring of negligible mass has a constant k = 800 Mm.
a) (2 pts) How far should you compress the spring to store 6.8.! of energy in it?
b) (6 pts) You place your spring vertically and drop a [0 kg dictionary on it from a height o
2. (6 points) (Comparable to 6.39, 6.45) Solve this problem using work-energy methods.
A 5 kg bowling ball moves at 10 m/s on a at and frictionless surface. It hits a massless bumper
with a spring constant of 100 Mm. How far (in cm) will the spring compre
" um will
Name: a | cfw_El 0* Sectlon: Beam I11am 32pm WEI-
Dumber
Where.
2. (4 points) In addition to section 1.3 in the textbook, take note of page A-S in Appendix F, the
Prexes for Powers of I 0 table. Rewrite the following values without the prexes:
1
Name: If M Section: CI Earn I 11am D 2pm cfw_:1
PHYS 141 - Written Homework #02
Due Date: 11:59pm on Wednesday, September 7, 2016
Black ink is recommended for a clear pdf submission; unclear work cannot receive credit.
. 25 ; 1. (6 point
3. (6 pts) (Like 5.50, but symbolic) The Giant Swing"
at a county fair consists of a vertical central shaft with a
number of horizontal arms attached at its upper end.
Each arm supports a seat suspended from a cable of
length L2 and the upper end of the c
Name: L lCM Lecture Section: El 8am E 11am El 2pm
PHYS 141- Written Homework #06
Due Date: 11 59pm on Wednesday, October 5; 2016 , ' i ' - -
Black ink is recommended for a clear pdf submission. All four pages must be submitted and' in orderl.
1. (8 points
Name: All Lecture Section: El 8am I 11am El 2pm [:1
PHYS 141 - Written Homework #04
Due Date: 11:59pm on Wednesday, Sept. 21, 2016
Black ink is recommended for a clear pdf submission; unclear work cannot receive credit.
1. (8 points) Like problem 4.33, ex
3. (6 points) A car drives on a circular road or radius R. The distance drlven by the car ls
given by d(t) = at + b [where t in seconds will give din meters]. In terms of a, b. and R,
and when t = 2 seconds, nd an expression for the magnitudes of (l) the
2. (4 points) (Based upon 4.19) The largest piece of equipment that an astronaut on Earth can
lift has a weight of 392 N. (in the Moon, the acceleration due to gravity is only 1.62 m/Sz-
-> =>
F=ma
(a) What is the mass and weight of that same piece of equ
3' (8 points) Consider a book, mum on a desk, which is on the oor. Clearly name and give
the direction of eight FORCES, in four PAIRS, which are related by Newtons Third Law, WhiCh
involve the book and/or the desk.
6) (erviha on boot.
) Glrawihj on hick
2. (6 points) cfw_Similar to 1.48) For the vectors shown
In the gure, find (1) the scalar product 5- D. and (Ii) 5mm m
the vector product if x a. cfw_In the figure, +1 would
be out-of the page]
(n .8?- (47- 60315.142' 6!! 35') 611mm
._)
C' =(lOoq / 5-)
2. (7 pts) (Compare with 7. 31-7. 33) A force acts on a particle moving along the x-axis This
force produces a potential energy U(x)= -C/x. such that C= 23 3 J m is a constant. What' is
the acceleration of the particle (mass = 2. I kg) when it IS located
Problem 1. [15 points]
Source 1 in the figure emits electromagnetic radiation of 15 MHz
in every direction. The radiation is detected at point P located
40m away from the source. At P the wave delivers an average of
4 10-4 W of power on a small square of
Physics 142
Quiz 9
Spring 2016
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Phys 142
Quiz 9
p. 1 of 3
1) (a) A 25-mWlaser puts out a narrow beam 1.00mm in diameter. Find the rms values of E and B in the
beam. (5 points)
Erms=_
Brms=_
!
b