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1.List important tools used in biotechnology and genetic engineering
Genetic Engineering deliberate modification of organisms genetic information by directly changing the
sequence of nucleic acids in
The eld lines associated with a uniform electric eld in a region of
space are shown in the attached gure. Imagine drawing two
equipotentials in the plane of the gure. one passing through point A
and a
Question 3 1 I 1 Pts
For the previous question, nd the electric eld [in newtonsfcoulomb
at the position of the test charge. Again. supplv a positive value if the
electric eld points to the
Question 2 1 I" 1 ts
ZC q 3#0
3cm Zero
The gure shows a test charge :1 between the two positive charges.
Find the force cfw_in newtonsl on the test charge for q = 3 HC. lGive a
positive answer if the
Question 5 0.5 I 0.5 pts
How much work cfw_in joules is done in moving a charge of 2.5 m: a
distance at 51 cm along an equipetential at 13 V? Do not include units
1with your answer.
0.0 (with ma
Question 4 0.5 f 0.5 pts
A xed system of charges exerts a force of magnitude 22 N on a 4.0 C
charge. The 4.0 C charge is replaced with a 8.0 C charge. What is the
exact magnitude of the force cfw_in N
Question 7 0.5 f 0.5 pts
Under electrcuetatic conditions. the electric eld ineide a selid conductor
points towards the surface of the cunducter.
Correct!
Summer 2017
General Physics I
Time: 12:00 14:10 Tu, Th, ISA 1051
Textbook: University Physics, by. Sears, Zemansky, Young and Freedman, 14th edition. Pearson
Instructor: Dr. Sagar A. Pandit
Office Hou
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1
2
Question:
Consider a child name Pat shown in the picture.
Pat pulls the loose end of the rope such that
the spring scale read 250 N. Pats true weight is
320 N, and the chair weighs 160 N. (a) Ca
1
1
Real rigid objects and elasticity
Real rigid objects and elasticity
So far we have assumed that objects remain rigid
when external forces act on them
Real rigid objects and elasticity
So far we ha
1
1
2
Kinetic energy
2
Kinetic energy
Kinetic energy is the energy of a particle due to its
motion
2
Kinetic energy
Kinetic energy is the energy of a particle due to its
motion
2
K
=
mv
2
Kinetic ener
1
1
2
Newtons second law or definition
= d p/dt
F
Why define force anyway? Why not some quantity
say Q = d2 p/dt2
If Newton had stopped with three laws it was a valid
question.
Newton showed in law
Current class average: ~ 56
Standard Deviation: ~ 19
1
2
2
3
Motion of system of particles
If we sum over all the internal forces, they cancel in
pairs and the net force on the system is caused only
b
Problem solving
1
Question:
Consider an object on which a net force is a resistive force proportional to
the square of its speed. e.g. f = - k m v2 where k is a constant is m is the
mass of the object
1
1
Periodic Motion
Periodic motion is where system starts in a state and returns to
that same state in finite time. A point particle starts from a
position and returns to it.
Circular motion is si
Coordinate system
-20 -10
Use d to describe the
position of a point in space
20
(20, 20)
20
10
Coordinate system consists
of
-20 -10
10
-10
-20
relative to the origin and the axes
10
y
A fixed refere
1
1
2
What are fluids?
A
fluid is a collection of molecules that are randomly
arranged and held together by weak cohesive forces
and by forces exerted by the walls of a container
Both liquids and gas
1
1
2
Energy conservation
2
Energy conservation
Energy is conserved
2
Energy conservation
Energy is conserved
This means that energy cannot be created nor
destroyed
2
Energy conservation
Energy is con
Projectile motion
Our velocity equations of motion are
vx = vx(0)
vy = vy(0) - g t
Equations of motion are
x = vx(0) t
y = vy(0) t - 1/2 g t2
Question:
A cannon is fired at 50 m/s with 60o with resp
International System of Units (abbreviated SI
from the French Le Systme International
d'Units)
The SI was developed in 1960 from the old metrekilogram-second (mks) system
Quantity
SI Unit
Length
mete
Problem solving II
1
Question:
A cylinder of uniform density with radius R is rolling down (without slipping)
on an inclined plane from rest. Let the mass of this cylinder be M and initial
height of t
1
1
2
Kinetic energy of rotating rigid body
kinetic energy is sum of kinetic energies of all the
particles
2
Kinetic energy of rotating rigid body
kinetic energy is sum of kinetic energies of all the
Position
The objects position is its
location with respect to a
chosen reference point
Consider the point to be
the origin of a coordinate
system
In the diagram, allow the
ro a d s i g n to b e t h e