Daisy raises 10.Kg to a height of 2.5 meters in 2.0 seconds. (a) How much work did she do? (b) How much power was expended? (c) If she raises it in 1.0 s rather than 2.0 s, how do the work and power change?
What will be an ideal response?
(a) 0.25 kJ
(b) 0.12 kW
(c) same work but power doubles
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If you release a single molecule in an evacuated region it will initially
A) fall just as a baseball would. B) move in any direction. C) convect upward. D) be buoyed upward. E) none of the above
The image of a convex mirror is always
a. virtual, inverted, and larger. b. virtual, upright, and smaller. c. real, upright, and smaller. d. real, inverted, and larger.
A single brick falls with acceleration g. The reason a double brick falls with the same acceleration is
A) that in free fall all accelerations are g. B) its ratio of force to mass is the same. C) an experimental fact tested many times. D) none of the above
What is "excluded" by the Pauli exclusion principle?
a. certain values of angular momentum b. precise values of both position and momentum c. electrons in the same quantum state d. none of the above