A charged particle (q = ?8.0 mC), which moves in a region where the only force acting on the particle is an electric force, is released from rest at point A. At point B the kinetic energy of the particle is equal to 4.8 J. What is the electric potential difference VB ? VA?
a. ?0.60 kV
b. +0.60 kV
c. +0.80 kV
d. ?0.80 kV
e. +0.48 kV
b
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A hockey puck traveling at speed v on essentially frictionless ice collides with one end of a straight stick lying flat on the ice and sticks to that end. In this collision
a. momentum is conserved. b. angular momentum is conserved. c. energy is conserved. d. all of the above are conserved. e. only momentum and angular momentum are conserved.
During the Carboniferous Period,
A) the carbon dioxide cycle started to operate for the first time B) carbon-rich meteorites impacted the Earth C) the first carbon-based life appeared D) land was covered with dense forests with the appearance of the first insects and amphibians
An object attached to an ideal spring executes simple harmonic motion. If you want to double the total energy of the object-spring system, you could
A) double the amplitude of vibration. B) double the spring constant of the spring. C) double both the amplitude and spring constant. D) double the mass of the object. E) double both the mass of the object and amplitude of vibration.
The basic function of an electromotive force in a circuit is to do which of the following?
a. Convert electrical energy into some other form of energy. b. Convert some other form of energy into electrical energy. c. Both choices (a) and (b) are valid. d. None of the above choices are valid.