Question

The Hubble time is deﬁned as t_{H} = 1/H_{0}.
Consider a Closed model for the Universe without a cosmological
constant, so that the mass density parameter is Ω_{M} >
1. Give an expression for the age t_{max} (in units of
t_{H}) of a Closed model at the time when the Universe has
reached its maximum size, is no longer expanding, and is about to
start contracting.

Answer #1

Consider a closed FRW universe (K = H02 [
? 1] > 0) in which a(t) ? t. How long does it take a light ray
to go around the universe if it is sent at time ti?

A model of rocket weighing 0.2 lbs is initially at
rest at time t = 0 when launched vertically
upwards using a propulsive force of 2 lbs. This propulsive force is
applied from 0 <t ≤ 1 sec.
When t> 1 sec, the propulsive force stops acting. By neglecting
the resistance of the air and assuming that the
mass of the rocket remains constant, determine
a) The time required for the rocket to reach its
maximum height.
b) The maximum...

ch 6
1:
It is generally a good idea to gain an understanding of the
"size" of units. Consider the objects and calculate the kinetic
energy of each one.
A ladybug weighing 37.3 mg
flies by your head at 3.83 km/h
.
×10
J
A 7.15 kg
bowling ball slides (not rolls) down an alley at 17.5 km/h
.
J
A car weighing 1260 kg
moves at a speed of 49.5 km/h.
5:
The graph shows the ?-directed force
??...

Please summarize the below article in approximately 100
words:
Monumental function in British Neolithic burial practices
Ian Kinnes
The high-risk rate of survival for the non-megalithic series of
Neolithic funerary monuments, recently re-emphasized by Piggott
(1973: 34), introduces a further variable into the deductive study
of burial practices. In Britain and Europe the overall distribution
of monumental forms present both lacunae and a marked preponderance
of cairns over earthen mounds which are in ill accord with the
known or predicted...

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