The uncertainty in the position of a proton is 250 pm. What is the minimum velocity of the proton when its position has been measured to this precision?
A. 0.29c
B. 0.10c
C. 0.39c
D. 0.21c
C. 0.39c
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Escape speed from Mars is
A) about the same as from Earth. B) greater than from Earth. C) less than from Earth.
What does the law of conservation of momentum tell us about collisions?
a. Collisions increase the momenta of the colliding objects because the impacts add momentum. b. Collisions decrease the momenta of the colliding objects because the friction of the impact decreases momentum. c. The total momentum in the system does not change because of a collision. d. The total momentum in the system goes to zero at the time of the collision. e. The momentum of each colliding object goes to zero upon collision.
What is the power factor for a series ac circuit containing a 50-? resistor, a 10-?F capacitor, and a 0.45-H inductor, when connected to a 60-Hz power supply?
A) 0.00 B) 0.46 C) 1.0 D) 0.79
The laws of thermodynamics can be related to the following: (i) the measurement of temperature, (ii) the lowest temperature possible, (iii) conservation of energy, and (iv) only part of heat energy available may be turned into work. Which of these involve the first and second law?
a. (i) and (ii) c. (i) and (iii) b. (ii) and (iv) d. (iii) and (iv)