Physics, 10.11.2019 03:31 imantahir1200345
In a massive-star supernova explosion, a stellar core collapses to form a neutron star roughly 10 kilometers in radius. the gravitational potential energy released in such a collapse is approximately equal to g m2/r, where m is the mass of the neutron star, r is its radius, and g is the gravitational constant. using this formula, estimate the amount of gravitational potential energy released in a massive -star supernova explosion. how does it compare with the amount of energy radiated by the sun during its entire main-sequence lifetime?
Answers: 1
Physics, 21.06.2019 14:00
Atransverse wave is traveling on a string stretched along the horizontal x-axis. the equation for the vertical displacement y of the string is given by y = (1.8 x 10-3)cos[π(13x - 60t)], where all quantities are in si units. what is the maximum speed of a particle of the string
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Physics, 21.06.2019 16:30
Bone-strengthening physical activity done increases bone-mineral content and bone density in youth.
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Physics, 22.06.2019 18:00
Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.
Answers: 1
Physics, 22.06.2019 18:30
Examples of states of consciousness include a. daydreaming b. dreaming during sleep c. hypnosis d. all of the above
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In a massive-star supernova explosion, a stellar core collapses to form a neutron star roughly 10 ki...
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