A. +x direction
B. -x direction
C. +y direction
D. -y direction
E. +z direction
F. -z direction
T. The field is zero.
F. -z direction
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Potential Energy: Two protons are released from rest, with only the electrostatic force acting. Which of the following statements must be true about them as they move apart? (There could be more than one correct choice.)
A. Their electric potential energy keeps increasing. B. Their kinetic energy keeps increasing. C. Their electric potential energy keeps decreasing. D. Their kinetic energy keeps decreasing. E. Their acceleration keeps decreasing.
A ball of mass 5 kg attached to a string is swung in a horizontal circle of radius 0.5 m. If the tension in the string is 10 N, the work done by the tension in one revolution is ________ J.
Fill in the blank(s) with the appropriate word(s).
A 900-kg car traveling east at 15.0 m/s suddenly collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together after the collision. What is the speed of the wreckage just after the collision?
A) 6.10 m/s B) 12.2 m/s C) 25.0 m/s D) 35.0 m/s E) 17.3 m/s
When considering human metabolism in terms of the 1st law of thermodynamics, which of the following represents the metabolic rate?
a. ?U / ?t b. ?Q / ?t c. W / ?t d. ?W / ?t