A 1200-kg automobile moving at 25 m/s has the brakes applied with a deceleration of 5.0 m/s2 . How far does the car travel before it stops?
a. 39 m
c. 55 m
b. 31 m
d. 63 m
D
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Although neutron stars are very hot, they are faint and not easy to see at visual wavelengths because
a. light does not escape from their event horizon. b. most lie beyond dense dust clouds. c. they have only a small surface area from which to emit. d. the peak of their thermal emission is at much shorter wavelengths than visual. e. they have only a small surface area from which to emit and the peak of their thermal emission is at much shorter wavelengths than visual.
What was Cecilia Payne's discovery?
A. She showed how to calculate the level in which an atom's electrons were most likely to be found. B. She proved that stars are composed mainly of hydrogen. C. She classified stellar spectra by temperature. D. All of these choices are correct.
A parallel-plate capacitor consists of a set of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery that maintains a constant potential difference across the plates
A slab of a dielectric material is inserted in the region between the plates and completely fills it. What changes would you observe as the dielectric is inserted? (There could be more than one correct choice.) A) Both the charge on the plates of the capacitor and its capacitance would change. B) The potential difference across the plates would increase. C) Only the charge on the plates of the capacitor would change. D) Nothing would change. E) Only the capacitance would change.
The frequency of a body oscillating from a spring on the moon is___________ the frequency of the same body oscillating from the same spring on earth
a. the same as b. larger than c. smaller than d. not related to e. depending on the mass, smaller or larger than