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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.
An object is thrown downward from a 150-ft cliff with a velocity of 45m/hr so that it makes an angle of 60° with vertical face of the cliff.
A 4 X 8-ft solar collector has water circulating through it at the rate of 1.0 gallon per minute while exposed to sunlight with intensity 300 Btu/ft^2-hr.
A 4000-m 3 /day conventional activated sludge plant has an influent with a BOD5 of 190 mg/L and SS of 225 mg/L. What population would this plant serve?
Pore water pressure is to be observed during the construction of the embankment. Calculate the pore water pressure which must not be exceeded at any point in the clay layer 9 m below the surface of the embankment to ensure a shear strength of 100 ..
Conduct a Case Study on this disaster identifying safety management, safety audits, accident investigation, and industrial hygiene issues. Your Case Study should be a minimum of 500 - 600 words and contain the components listed above.
If the time required to pay for parking is exponentially distributed with a mean of 15 seconds, find the average time in system.
As the piston is compressed, the pressure also increases by 2000000 Pa. If there is 4 times as many atoms of nitrogen as helium, how many moles of helium are in the cylinder?
Determine the differential settlement between the centre line of the ring beam and under the centre of beam. The inner and outer radii of the ring beam are 8m and 12m respectively.
Determine the required pumping rate. the aquifer has T= 1600 m 2 /day and the wells each have radius of influence of 600m.
Determine the number of man-hours required to form the structure using data from R. S. Means or other appropriate reference. What is the difference between labor cost and labor pro-ductivity?
Assuming a standard driver reaction time of 2.5 seconds, what is the probability that the vehicle pulling out will get in an accident with oncoming traffic?
Calculate the force (in Kn) a punch press must exert if it is to punch out a large washer from a strip of 5-mm thick sheet steel with an ultimate shear strength of 400 MPa.
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