A particle moves along a path and its speed increases. In which of the following cases are its acceleration and velocity vectors parallel?
1.when the path is a parabola
2.when the path is straight
3.when the path is circular
4.never
2
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Mars may have been more Earth-like in the past because
A) its atmosphere was thicker and warmer B) it was rotating more rapidly C) the Sun was dimmer, putting out less solar radiation D) it was not as close to the Sun
We do not yet know when (in what year) the maximum amount of crude oil produced per year worldwide will occur
What will be an ideal response?
Convective heat transfer can only occur if fluids mediate the energy transfer
Indicate whether the statement is true or false
Which of the following forms of energy is the greatest for a system of a comet in orbit about the Sun during perihelion (the comet's closest approach to the Sun)
1.the total mechanical energy 2.the potential energy 3.the kinetic energy 4.none of these