An airplane starts at rest and accelerates down the runway for 20 s. at the end of the runway, its velocity is 80 m/s north. what is its acceleration?

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

Photoelectrons with a maximum speed of 6.50 x 107 m/s are ejected from a surface in the presence of light with a frequency of 6.75 x 1014hz. if the mass of an electron is 9.10 x 10-31 kg, calculate in joules the maximum kinetic energy of a single electron. 3.84 x 10-15 j 1.92 x 10-15 j 5.92 x 10-23 j 3.07 x 10-16 j

Observations show that interstellar clouds can have almost any shape and