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Asteroids with a diameter of ~50m are estimated to collide with Earth every ~750 years. Such an event is expected to generate an airburst (atmospheric explosion) with an energy equal to 5.2 Megatons of TNT (or roughly 3250x the energy of the nuclear bomb dropped on Hiroshima in World War II).
a) Without any information about past events, what is the probability that such an event will happen in your lifetime? (Assume that the future average longevity of Americans is 80 yrs.)
b) The last time an asteroid of this size hit Earth was fairly recently, in 1908 over Tunguska, Siberia. This event is estimated to have knocked over ~80 million trees and is the largest impact event in recorded history, easily capable of obliterating a large city. Given that this event occurred, what is the probability of a second impact of this magnitude during your lifetime?
c) Cities cover approximately 0.5% of the Earth's land area, which itself constitutes 29% of the total surface of the planet. What is the probability that the second explosion in part (b) occurs over a city? Assume an equally likely probability of impact over the entire surface.
Describe in your own words the three strengthening mechanisms i.e., grain size reduction, solid solution strengthening, and strain hardening. Be sure to explain how dislocations are involved in each of the strengthening techniques.
A four-lane freeway is on a mountainous terrain with 11-ft lanes, a 5-ft right-side shoulder, and a 3-ft left side shoulder. During the peak hour there are 12% trucks and buses and 6% recreational vehicles.
The grade of the highway, Suppose that a highway rises a distance of 269 feet in a horizontal distance of 2647 feet.
What difference does the tightening of bolt in the friction grip joint make to the load at first slip and the failure load.
What is the concentration of tracer in the reactor 1 h after tracer addition is terminated? The reactor had an initial concentration of tracer of 1.0 mg/L when tracer addition commenced.
Ernst & young is currently providing support to various sectors. In this regards it was felt that if this report is able to document good practices currently being adopted or planned in ceramic sector.
Under the 200% DB depreciation, what is the cumulative depreciation through the end of year four? The useful life of the mixing tank is 9.5 years.
Water flows steadily through a horizontal nozzle. The nozzle inlet diameter is 6 in. At the nozzle outlet, where the pressure is atmospheric, the diameter is 2 in. Determine the pressure head at the nozzle inlet to produce a water jet velocity of ..
A four- lane undivided multilane highway ( two lanes in each direction) has 11- ft lanes and 5- ft shoulders. At one point along the highway there is a 4% upgrade that is 0.62 mi long.
Writing case study about bridge collapse
The block has a mass of 150 kg and rests on a surface for which the coefficients of static and kinetic friction are 0.5 and 0.4, respectively. If a force F = (60t^2) N, where t is in seconds, is applied to the cable, determine the power developed ..
The inlet of loe pressure turbine is 500Kpa and 500°C. Condenser operates at 10 Kpa. Determine the mass flowrate through boiler needed to produce 5000KW of power.
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