Air is pumped into a bicycle tire at constant temperature. The pressure increases because:
A. more molecules strike the tire wall per second
B. the molecules are larger
C. the molecules are farther apart
D. each molecule is moving faster
E. each molecule has more kinetic energy
Answer: A. more molecules strike the tire wall per second
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A certain automobile engine takes in 4.00 kJ of heat and performs 1.10 kJ of mechanical work in each cycle
(a) Calculate the engine's efficiency. (b) How much heat is "wasted" in each cycle? What will be an ideal response?
Which of the following best characterizes electrical insulators?
a. charges on the surface don't move b. high tensile strength c. electric charges move freely d. good heat conductors
Film behind a double slit is exposed to light in the following way: First one slit is opened and light is allowed to go through that slit for time ?t. Then it is closed and the other slit is opened and light is allowed to go through that slit for the same time ?t. When the film is developed the pattern will be
a. one single slit pattern. b. two superimposed single slit patterns, their centers displaced from each other by the distance between the two slits. c. one double slit pattern. d. two double slit patterns, their centers displaced from each other by the distance between the two slits. e. random darkening of the film. (no pattern at all)
If the velocity of an object is zero, does it mean that the acceleration is zero? Support your answer with an example
A) no, and an example would be an object starting from rest B) no, and an example would be an object coming to a stop C) yes, and an example would be an object sitting at rest D) yes, because of the way in which velocity is defined E) yes, because of the way in which acceleration is defined