Q. A student's head is bent over her physics book. The head weighs 50.0N and is supported by the muscle force Fm exerted by the neck extensor muscle and by the contact force Fc exerted at the atlantooccipital joint. Given that the magnitude of Fm is 60.0N and is directed 35 degrees below the horizontal, find (a) the magnitude and (b) the direction of Fc.
Q. A magnetic computer disk 8.0 cm in diameter is initially at rest. A small dot is painted on the edge of the disk. A small dot is painted on the edge of the disk. The disk accelerates at 600 rad/s^2 for 1/2 s , then coasts at a steady angular velocity for another 1/2 s .
what is its speed at 1s?
How many revolutions?