You are able to hold out your arm in an outstretched horizontal position because of the action of the deltoid muscle. assume the humerus bone has a mass m1=3.6kg, length l=0.66m and its center of mass is a distance l1=0.33m from the scapula. (for this problem ignore the rest of the arm.) the deltoid muscle attaches to the humerus a distance l2=0.15m from the scapula. the deltoid muscle makes an angle of ? =17? with the horizontal, as shown. (figure 1) (figure 2) use g=9.8m/s2 throughout the problem. find the tension t in the deltoid muscle. using the conditions for static equilibrium, find the magnitude of the vertical component of the force fyexerted by the scapula on the humerus (where the humerus attaches to the rest of the body).now find the magnitude of the horizontal component of the force fx exerted by the scapula on the humerus.

The two required components for a generator are

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0