Consider two charged spheres, one with charge +2 C and the other with ?2 C. A proton (a positively charged particle) is at the point halfway between the spheres. What is not zero?
a. the potential energy of the proton
b. the work to move the proton from infinity to that point
c. the force on the proton
d. all of the three above are zero
c
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A car travels counterclockwise around a flat circle of radius 0.25 km at a constant speed of 20 m/s. When the car is at point A as shown in the figure, what is the car's acceleration?
A. 1.6 m/s2, south B. Zero C. 1.6 m/s2, east D. 1.6 m/s2, north E. 1.6 m/s2, west
The second law of thermodynamics implies that
A) non-thermal forms of energy cannot be entirely converted into thermal forms of energy. B) thermal energy cannot be entirely converted into non-thermal forms of energy. C) from the microscopic point of view, thermal energy is just kinetic energy of individual atoms and molecules. D) in physical process in which heat is produced, the total amount of energy is reduced by an amount equal to amount of heat produced. E) in every physical process, the total amount of energy must remain unchanged.
How is it possible that the Moon might have some water ice today?
A) Ice brought by comet impacts may be frozen in craters near the Moon's poles. B) Ice is continually supplied to the Moon by impacts, and some of this ice will therefore be found almost anywhere on the Moon at all times. C) Some cold regions of the Moon may still have ice that originally formed from the condensation of water released by outgassing. D) The Moon has significant amounts of water bonded in its surface rock, so some of this water is frozen as ice.
Tycho Brahe relied on the use of telescopes to record his accurate positions for the planets.
Answer the following statement true (T) or false (F)