Problem #2: An apple is thrown upward with an initial velocity of +24.0 m/s. a. Sketch the apple’s trip and label what you know.

b. How high will the apple go? (Ans: +29.4 m)

c. What is the total time needed for the apple to return to its original position? (Ans: 4.90 s)

Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v

Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?

Observations show that interstellar clouds can have almost any shape and