The masses mi are located at the points Pi. Find the moments Mx and My and the center of mass of the system. m1 = 4, m2 = 3, m3 = 2, m4 = 5; P1(−4, 2), P2(0, 5), P3(3, 1), P4(1, −2)

Abird sitting high in a tree is an example of what type of wnergy

Frequency of electromagnetic waves that a radio station is assigned is called

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.