28. A boat leaves the dock at t = 0 and heads out into a lake with an acceleration of 2.0m/s2i^. A strong wind is pushing the boat, giving it an additional velocity of
2.0m/s iº+1.0m/s jº. (a) What is the velocity of the boat at t = 10 s? (b) What is the
position of the boat at t = 10s? Draw a sketch of the boat's trajectory and position at
t = 10 s, showing the x- and y-axes.

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

How much energy is supplied to each coulomb of charge that flows through a 12-v battery?

Which is the most accurate name for the ionic compound cas?