homework work mastering physics assignments study for exam rotational motion torque and angular...
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HomeworkHomework Work Mastering Physics Assignments Study for Exam
rotational motion torque and angular momentum static equilibrium gravity
Review Session - 7 PM - HL 188 Work Reading Assignment for Friday Work on Lab Presentation
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ExampleExample A 150 kg satellite is in circular orbit of radius 7.3 Mm
about the earth. Determine the potential energy.
U = -8.2 x109 J Determine the orbital speed.
v = 7400 m/s Determine the kinetic energy.
K = 4.1x109 J What is the escape speed from
this altitude?
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ExerciseExercise
Why are rocket launch sites located nearer to the equator (rather than the poles)?
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Angular Momentum in the Bohr Model of the
Atom
Angular Momentum in the Bohr Model of the
Atom
In the Bohr model:
The electron orbits like a planet.
The electron can only have certain values of angular momentum.
L = n (h/2) where n is an integer
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Angular Momentum in Quantum MechanicsAngular Momentum
in Quantum Mechanics
L = (h/2)gives length of angular momentum vector
Lz = ml (h/2)gives orientation of the angular momentum vector The Bohr quantum number
)1( ll
LLz
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Quantum Numbers determine the shape of the state
Quantum Numbers determine the shape of the state
1s2s
2pl = 0 for s-state
l = 1 for p-state
l = 2 for d-state
LL = rr x mvv
Only s-states (L = 0) can have electrons at the origin.
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More Static EqulibriumMore Static Equlibrium How does a truck scale work?
If the front wheels give a weight of 10000 N, the middle wheels (which are 3 m back) give a weight of 30000 N and the rear wheels (which are 10 m further back) give a weight of 25000 N, where is the center of mass of the truck?
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Opening the paint can
Opening the paint can
A man tries to pry the lid off a can of paint with a very light screwdriver.
A force F is applied a distance L from the edge of the can. The screwdriver pushes up on the lid a distance d from edge of the can.
What is the upward force on the lid? What is the normal force supplied by edge of the can on
the screwdriver?
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ExampleExample If the wall is
frictionless, the floor is not, what are the forces acting on the ladder?
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FollowupFollowup
If the wall is frictionless, the coefficient of static friction between the ladder and the floor is 0.8, how large is the force of static friction?
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ExampleExample
At what angle will the contents spill?
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ExampleExample
A 9 m flagpole hangs in a horizontal position from the side of a building. It is supported by a hinge and a 15 m cable. Find the tension in the cable and the magnitude and direction of the force supplied by the hinge if the flagpole weighs 1500 N?