Two protons are fired toward each other in a particle accelerator, with only the electrostatic force acting. Which of the following statements must be true about them as they move closer together? (There could be more than one correct choice.)
A) Their kinetic energy keeps decreasing.
B) Their electric potential energy keeps decreasing.
C) Their electric potential energy keeps increasing.
D) Their kinetic energy keeps increasing.
E) Their acceleration keeps decreasing.
A, C
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A book rests on a level table top. Which force does Newton's third law imply is equal in magnitude but opposite in direction to the weight of the book?
A) the force of the table on the earth B) the force of the earth on the table C) the force of the book on the earth D) the force of the table on the book E) the force of the book on the table
Outside the ice line the temperatures are too warm for ices to condense
a. True b. False Indicate whether the statement is true or false
A p-type semiconductor has a net positive charge
A) True B) False
A proton moving at a speed of 3.8 × 10^6 m/s cuts across the lines of a magnetic field at an angle of 40°. The strength of the field is 0.25 × 10^-4 T. What is the magnitude of the force acting on the proton? (qp = 1.6 × 10^-19 C)
a. 1.4 × 10^-17 N c. 9.8 × 10^-18 N b. 2.3 × 10^-17 N d. 5.1 × 10^-18 N