How much work can be extracted from 5.00 × 10^4 j of heat when 2.00 × 10^4 j of heat is exhausted? a. - 7.00 × 10^4 j b. - 3.00 × 10^4 j c. 3.00 × 10^4 j d. 7.00 × 10^4 j *** you: )

Ateam of astronauts is on a mission to land on and explore a large asteroid. in addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. with what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? assume that the asteroid is approximately spherical, with an average density p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

Achemistry student needs of 40ml diethylamine for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of diethylamine is 0.7 . calculate the mass of diethylamine the student should weigh out. round your answer to significant digits.

What type of light does this light bulb produce most (i. e. at what wavelength does the spectrum have maximum intensity)?