A 6.0 kg box slides down an inclined plane that makes an angle of 39° with the horizontal. If the coefficient of kinetic friction is 0.19, at what rate does the box accelerate down the slope?
A) 4.7 m/s2
B) 5.2 m/s2
C) 5.5 m/s2
D) 6.2 m/s2
Answer: A
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A fixed charge of 10 nC sits at the origin. A charge of 9nC is places at (4m, 3m).
a) Find the electric potential energy of the 9 n charge b) Find the work required to move the 9 n charge from its initial position to (-6m, 8m).
Characteristic x-rays can be produced by bombarding targets with electrons. These x-rays occur when
a. electrons from higher shells fill the vacant lower shell b. electrons fill the vacant valence shell c. photons are emitted with energies on the order of 103 eV d. photons are emitted with wavelengths on the order of 103 nm
Based on the observed amount of deuterium in the universe, we can conclude that
A) neutrons outnumber protons 7 to 1 in the universe. B) most of the deuterium that was created during the era of nucleosynthesis has since been destroyed. C) we live in a critical-density universe. D) the density of ordinary (baryonic) matter is about 5 percent of the critical density. E) ordinary (baryonic) matter makes 75 percent of the mass of the universe.
As a particle's uncertainty in position gets smaller, its uncertainty in velocity
A) must remain unchanged. B) must decrease enough to satisfy the uncertainty principle. C) must increase enough to satisfy the uncertainty principle.