A fluid flows through a pipe whose cross-sectional area change from 4.00 m2 to 0.30 m2. If the fluid's speed in the wide part of the pipe is 2.5 m/s, what is its speed when it moves through the
narrow part of the pipe?
a. 0.071 m/s
b. 33.31/s
c. 1.1 m/s
d. 14 m/s

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

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

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)