) A position vector of a particle of 2kg mass at any time t is given by r =3ti+2t²j+t³k find at t =1 ...velocity and acceleration vectors,

b) the torque on the particle,

c) the kinetic energy,

d) Power,

e) Find the work done on the particle between t=0 and t=1

An element becomes a positively charged ion when itloses protons.loses electrons.gains electrons.gains neutrons.

Suppose that a mass of 2 kg is attached a spring whose spring constant is 50. the system is damped such that b = 12 . the mass is set in motion with an initial velocity of -8 m/s at a position 0 meters from equilibrium. set up and solve a differential equation that models this motion. write your solution in the form a cos ( ω t − α ) where α is a positive number. use your solution to fill in the information below: what is the amplitude of the motion? what is the value of ω ? what is the phase shift?

How many astronauts have walked on the moon?