Models of the first star-forming clouds indicate that they had a temperature of roughly 200 k and a particle density of roughly 300,000 particles per cubic centimeter at the time they started trapping their internal thermal energy. estimate the mass at which thermal pressure balances gravity for these values of pressure and temperature. how does that mass compare with the sun's mass? what is the estimated lifetime of a star with that mass?

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change? work power gravitational energy chemical energy

A3.9 g aluminum foil ball with a charge of +4.1×10−9 c is suspended on a string in a uniform horizontal e⃗ field. the string deviates to the right and makes an angle of 30∘ with the vertical. part a part complete what information about the e⃗ field can you determine for this situation? what information about the field can you determine for this situation? only the magnitude of e⃗ only the direction of e⃗ both the magnitude and the direction of e⃗ none of the above previous answers correct part b determine the magnitude of the electric field. express your answer with the appropriate units. e e = nothing nothing request answer part c determine the direction of the electric field. determine the direction of the electric field. to the right to the left away from you toward you