When a pendulum is at the position all the way to the left when it is swinging (at the top of the arc), what is true of the kinetic and potential energy? a) the potential energy is zero, and the kinetic energy is maximized. b) the kinetic energy is zero, and the potential energy is maximized. c) both the kinetic and potential energy are zero. d) both the kinetic and potential energy are at their maximum. d) there is no energy at this position.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Which of these statements is true? a. quarks pair with leptons to form protons and neutrons. b. quarks pair with bosons to form photons. c. quarks pair with photons to form protons and neutrons. d. quarks pair with other quarks to form protons and neutrons. e. quarks pair with electrons to form protons.

Two 1.20-m nonconducting wires meet at a right angle. one segment carries + 2.50 µc of charge distributed uniformly along its length, and the other carries - 2.50 µc distributed uniformly along it, as shown in fig. 21.50. ( a. find the magnitude and direction of the electric field these wires produce at point p, which is 60.0 cm from each wire. ( b. if an electron is released at p, what are the magnitude and direction of the net force that these wires exert on it?