Suppose that vector c = a - b . under what circumstances is the length of c equal to the sum of the lengths of a and b?
1-when a and b are parallel
2-when a and b are in opposite direction
3-always
4-never

Which surface feature of the moon is characterized by mountainous areas? terrae craters maria regolith

What is the name for the remnant of an asymptotic giant that has lost its shells? black dwarf white dwarf yellow giant black hole

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.