A hand applies a 500 N force to a head during a slap. The area of the hand that directly came in contact to the head was 0.85 m2. a) What is the pressure applied by the hand to the face?
b) What is the pressure applied to the hand by the face during the slap?

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Within a pendulum, as potential energy decreases, energy increases. a. heat b. kinetic c. frictional d. gravitational

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants