Strontium−90 is one of the products of the fission of uranium−235. this strontium isotope is radioactive, with a half-life of 28.1 yr. calculate how long (in yr) it will take for 1.00 g of the isotope to be reduced to 0.600 g by decay.

How many neutrons does element x have if it’s stormy umber is 33 and it’s mass number is 95?

Aleaky 10-kg bucket is lifted from the ground to a height of 15 m at a constant speed with a rope that weighs 0.7 kg/m. initially the bucket contains 45 kg of water, but the water leaks at a constant rate and finishes draining just as the bucket reaches the 15-m level. find the work done. (use 9.8 m/s2 for g.) show how to approximate the required work by a riemann sum. (let x be the height in meters above the ground. enter xi* as xi.) lim n → ∞ n (9.8)(45−3 xi) i = 1 δx express the work as an integral. 0 dx evaluate the integral. (round your answer to the nearest integer.) j

Would it be correct to say the doppler effect is the apparent change in the speed of a wave due to the motion of the source? be sure to fully explain your position using at least 3 complete content related sentences.