72 In the two-dimensional collision in Fig. 9-21, the projectile particle has mass m = m, initial speed v1 = 3vo, and final speed v
= V5vo. The initially stationary target particle has mass m = 2m
and final speed vze=v2. The projectile is scattered at an angle given
by tan 6 = 2.0.(a) Find angle Oz. (b) Find vz in terms of vo- Is the
collision elastic?
be some

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

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.

The junction rule describes the conservation of which quantity? note that this rule applies only to circuits that are in a steady state.