Lesson 7 Problems Involving Momentum and
Energy
Monday, December 09, 2013
1:59 PM
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Unit 4 Momen
Physics 12
Name:_
Score: _/12
Momentum Quiz #2
Version 1
Show work clearly, including all substitutions, etc. Make clear diagrams where necessary. Check
your sig figs!
1.
A 1200 kg car is moving East at 30.0 m/s and collides with a 3600 kg truck moving at
Lesson 5 1-Dimensional Momentum
Monday, December 09, 2013
1:59 PM
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Throw the camera directly opposite to the space
shuttle, and use conservation of momentum
b) find
Lesson 6 2-Dimensional Momentum
Monday, December 09, 2013
1:59 PM
Unit 4 Momentum Page 1
The lighter can moves off twice as fast in the opposite
direction.
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Lesson 8 Explosions and Other Problems
Monday, December 09, 2013
2:00 PM
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b) Find the change in KE.
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1. Take home quiz
Physics 12
Name:
The Ultimate Vector Momentum Assignment
Key Formulae:
p = mv
and
p = F t
REMEMBER, MOMENTUM IS A VECTOR! YOU WILL BE DRAWING TIP-TOTAIL VECTOR DIAGRAMS FOR MOST QUESTIONS, UNLESS NO ANGLES ARE
MENTIONED!
9401
1.
2.
3.
9406
4.
5.
9501
6.
9
Lesson 4 Friction
Friday, November 22, 2013
6:03 PM
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a=0, so net force must be zero.
(Newton's First and Third laws)
Little Kid
Parallel P.
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Yup. It's c
Lesson 6 Universal Gravitation
Friday, November 22, 2013
6:11 PM
Unit 4 Forces Page 1
Inertia
(Why Eart.
Inertia
(Why Eart.
Newton's 3rd (forces come in pairs)
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4 times weaker
9 times weaker
16 times weaker
2 times
Lesson 3 Types of Forces
Friday, November 22, 2013
6:03 PM
Unit 4 Forces Page 1
Towards the center of the gravitational body
The Forces
On You (I.
A scale measures the normal force!
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First Roller
Coaster Ri.
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a and
Lesson 1 Introduction to Forces
Friday, November 22, 2013
11:55 AM
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Applies a force in the opposite direction of motion
Newtons1st
ice car cr.
Subway
Sleeper .
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Unit 4 Force
Lesson 5 Many Body Problems
Friday, November 22, 2013
6:11 PM
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Three
Incorrect .
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d) Find tension!
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Lesson 2 Free Body Diagrams
Friday, November 22, 2013
6:02 PM
Space
Station Re.
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SemiTruckSt
oppedbyS.
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Unit 4
Another radioactive isotope found in the earth is 92U238 . Since it is well
above the 209 mass limit, it gives rise to a whole series of radioactive
isotopes with mass numbers 238, 234, 230, 226, 222, 218, 214, 210. The
226 isotope is 88Ra226, which is th
To give some scale to the radiation levels in relation to their health effects,
lets consider the background radiation.
Plants take up carbon, including radioactive carbon-14, from the air.
Therefore, all the food we eat and even our bodies have carbon-14
In some cases, a very heavy nucleus, instead of undergoing alpha decay,
will spontaneously split in two. Example:
U238
92
Sn129 + 42Mo106 + 30n1 + energy
50
This fissioning of uranium does not always result in these two resultant
atoms - there is a whole
Since nuclear forces do not have the long range of gravity and
electromagnetism, we can treat the forces as simply do they act or dont
they. This is like a target: we either hit the target or we dont.
The probability of hitting a target depends on the siz
Example of carbon dating:
The present day ratio of C-14 to C-12 in the atmosphere is 1.3x10-12 . The
half-life of C-14 is 5,730 years. What is the activity of a 1 gm sample of
carbon from a living plant?
A = lN = [ln(2)/5730 years]*[6x1023 atoms/mole * 1m
Review:
N(t) = No e-lt
A = lN = Aoe-lt
T(half life) = ln(2) / l .
If the half life is large, l is small. This means that if the radioactive
isotope will last a long time, its activity will be small; if the half life is
small, the activity will be large bu
The longest lived isotope in the fourth series is 93-Np-237 with a half life
of 2.2 million years. Note: million NOT billion. We do not find any of this
atom or this series on the earth (unless we ourselves make it).
Together this data on half lives and a
Can we devise a way to measure the health effects of radiation?
In addition to measuring ionization ability in air, we can also measure the
energy that is absorbed by a biological material:
Rad = .01 J/kg
MKS: Gray (Gy) = 1 J/kg = 100 rads.
This is called
Note: the gamma rays emitted in nuclear processes are NOT related to the
electron orbits - they are energy emitted by the nucleus and not the atom.
High energy photons interact with material in three ways: the
photoelectric effect (which dominates at low
At the cellular level, a dose of 100 millirems of ionizing radiation gives on
average
1 "hit" on a cell. (So the background radiation gives about 2
hits per year to each cell.)
There are five possible reactions to a hit.
1. A "hit" on a cell can cause DNA