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Physics Question?
Suppose that we have 40 x 1023 atoms of a radioactive substance with a half-life of 30 min.
(a) How many atoms of that element remain after 2 hours?
(b) How many atoms remain after 16 hours?
2 AnswersPhysics1 decade agoPhysics Question?
When we measure the rate of radioactivity of a given isotope 18 days after making an initial measurement, we discover that the rate has dropped to one-eighth of its initial value. What is the half-life of this isotope?
1 AnswerPhysics1 decade agoCan anyone tell me where in San Fracisco has Volunteering services for animal shelters for peole under 18?
Every place seems to require you to be be at least 18 years old, and I'm only 16! Can anyone please help!
2 AnswersDogs1 decade agoAre there any volunteer openings for a 16 year old who wants to work with animals?
For example: SPCA, Paws...
10 AnswersDogs1 decade agowhat is 2 iambic pentameter sentence having to do with love with 10 syllabal?
Poem form
1 AnswerWords & Wordplay1 decade agoHow do you do this physics problem?
Light with a wavelength of 500 nm (5 10-7 m) is incident upon a double slit with a separation of 0.25 mm (2.5 10-4 m). A screen is located 1.8 m from the double slit. At what distance from the center of the screen will the first bright fringe beyond the center fringe appear?
1 AnswerPhysics1 decade agoHow do I go to John A. O'Connell High School By bus?
How can I go from 1150 Francisco St San Francisco, CA 94109 to John A. O'Connell High School
2355 Folsom St, San Francisco, CA 94110 by bus??
2 AnswersSan Francisco1 decade agoGive the work required to accelerate the rock.?
Which requires more work: lifting a 7 kg rock to a height of 4 m without accelerating, or accelerating the same rock over the same distance horizontally from rest to a speed of 11 m/s? Assume firction is negligible.
2 AnswersEngineering1 decade agoAn ice skater with a mass of 83 kg pushes off against a second skater with a mass of 33 kg.?
Both skaters are intially at rest. (a) What is the total momentum of the system after they push off?(b) If the larger skater moves off with a speed of 1.8 m/s, what is the corresponding speed of the smaller skater?
1 AnswerPhysics1 decade ago