1) a 3kg particle with displacement r= (2t+3)i + 6j + 3t^2k
a 4 kg particle with displacement r= 2jsin(pi t) + (1-2t^2)k,
find the net force on the system.
2) consider the equation:
t= wo/a {-1 + sqrt(1+2 a theta/wo^2)}
i) is this dimensionally correct?
ii) what happens to it for wo=0?

How many molecules are present in 3 mols of silicon dioxide (sio2)?

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire