SOLUTION TO UNIT 4 PHYSICS TASK!
49.
Frequency of EMW,
f
speed , c
wavelength,
Maximum frequency,
f max
c
3 108
1.5 1015 Hz
min 200 109
Minimum frequency,
f min
c
max
3 108
7.5 1014 Hz 0.75 1015 Hz
9
400 10
Hence, frequency range of UV radiation:
0.

Physics Concepts
In order to solve the following physics problems for homework, you will need to have the following
physics and math concepts first at hand, then in your long term memory, ready to bring to bear
whenever they are needed. Every week (or day

Friction
So far, our picture of natural forces as being the cause of the acceleration of mass seems fairly
successful. In time it will become second nature to you; you will intuitively connect forces to all changing
velocities. However, our description th

Newtons Laws
Mathematics is the natural language and logical language of physics, not for any particularly deep reason
but because it works. The components of the semantic language of physics are thus generally expressed
as mathematical or logical coordin

Motion in Two Dimensions
The idea of motion in two or more dimensions is very simple. Force is a vector, and so is acceleration.
Newtons Second Law is a recipe for taking the total force and converting it into a differential equation of
motion: ~a = d 2~r

Atwoods Machine
Atwoods Machines consists of a pair of masses (usually of different mass) connected by a string that
runs over a pulley as shown. Initially we idealize by considering the pulley to be massless and frictionless,
the string to be massless an

A Constant Force in One Dimension
This time well imagine a different problem. A car of mass m is travelling at a constant speed v0 as it
enters a long, nearly straight merge lane. A distance d from the entrance, the driver presses the
accelerator and the

Turbulent Drag
Rayleigh, or Turbulent Drag On the other hand, if one moves an object through a fluid too fast where
the actual speed depends in detail on the actual size and shape of the object, how bluff or streamlined it
is pressure builds up on the lea

Force Balance Static Equilibrium
Before we start using dynamics at all, let us consider what happens when all of the forces acting on an
object balance. That is, there are several non-zero (vector) forces acting on an object, but those forces
sum up to ze