An electron is released form rest in a region of space where a uniform electric field is present. Joanna claims that its kinetic and potential energies both increase as it moves from its initial position to its final position. Sonya claims that they both decrease. Which one, if either, is correct?
a. Joanna, because the electron moves opposite to the direction of the field.
b. Sonya, because the electron moves opposite to the direction of the field.
c. Joanna, because the electron moves in the direction of the field.
d. Sonya, because the electron moves in the direction of the field.
e. Neither, because the kinetic energy increases while the electron moves to a point at a higher potential.
e
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Which of the following characteristics are held in common by both gravitational and electrostatic forces when dealing with either point masses or charges?
a. potential energy is a function of distance of separation b. forces are conservative c. inverse square distance law applies d. all of the above choices are valid
A refrigerator transfers heat from a colder body to a hotter body while energy is used to operate the device. This is
A. impossible unless the refrigerator uses a Carnot cycle. B. allowed only if the internal energy of the refrigerator increases. C. consistent with Clausius's statement of the second law. D. possible if entropy of the contents of the refrigerator increases.
Answer the following statement(s) true (T) or false (F)
1. The space time interval ?s between two events can never be larger than the coordinate time ?t between those events as measured in any inertial reference frame.
A rock is projected from the edge of the top of a building with an initial velocity of 12.2 m/s at an angle of 53° above the horizontal. The rock strikes the ground a horizontal distance of 25 m from the base of the building. Assume that the ground is level and that the side of the building is vertical. How tall is the building?
A. 25.3 m B. 29.6 m C. 27.4 m D. 23.6 m E. 18.9 m