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A 6.2 mg sample of 90Sr (half-life 29.12 y) is in secular equilibrium with its daughter 90Y (half-life 64.0 h). (a) How many Bq (becquerels) of 90Sr are present? (b) How many Bq of 90Y are present? (c) What is the mass of 90Y present? (d)What will the activity of 90Y be after 100 years?
how to calculate rupture point of a sample in four point bending, given dimensions, Young's modulus, Yield strength and I(Moment of inertia area)
The compression ratio of an air-standard Otto cycle is 9.5. Prior to the isentropic compression process, the air is at 100 kPa, 17 C, and 600 cm2
a large number of concrete slabs each 0.6 m in length are lined up with a spacing of 0.1nbspmm between them. the
Determine the specified data for water at the states indicated and locate each state on a P-v and T-v diagram.
sludge is wet solids that result from the processing in municipal sewage systems. the sludge has to be dried before it
a circular cylinder of tantalum with an initial diameter of 3.1 mm is fired at a target. during impact the base of the
a 14 mm diameter 50 mm long mild steel rod undergoes a stress test. a tensile force of 18800 n is applied and the rod
determine the minimum no of teeth required on pinion in order to avoid interference which is to gear with 1 a wheel to
you are given a task of compressing a fixed quantity of gas from P1,T1 to P2,T1. you wish to do this using a polytropic process coupled with a constant pressure P2 heat-transfer process. determine the polytropic process that minimizes the entropy ..
two kg of superheated steam contained in piston cylinder at 400 c and 600 kpa are cooled at a constant pressure by
Determining initial acceleration of a projectile How can I proceed to solve the problem below?
initially 1.361 kg of steam is contained in a piston-cylinder device at 260 oc with a quality of 0.7. determine the
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