An object of radius R and moment of inertia I rolls down an incline of height H after starting from rest. Its total kinetic energy at the bottom of the incline:
a. is gR/I.
b. is I/gH.
c. is 0.5Ig/H.
d. cannot be found from the given information alone.
d
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A 24.0-kg crate, initially at rest, slides down a ramp 4.0 m long and inclined at an angle of 20° with the horizontal. If there is no friction between ramp surface and crate, what is the kinetic energy of the crate at the bottom of the ramp? (g = 9.8 m/s2)
a. 880 J b. 940 J c. 644 J d. 322 J e. 161 J
a science fiction writer needs an environment for her latest story where stars are as crowded together as possible which of the following would be a good place to locate her story?
What will be an ideal response?
Consider our Moon, a white dwarf, and a neutron star. Which of the following lists them in the correct order of size (diameter), from smallest to largest?
A) neutron star, Moon, white dwarf B) Moon, white dwarf, neutron star C) white dwarf, neutron star, Moon
What is the net power that a person with surface area of 1.20 m2 radiates if his emissivity is 0.895, his skin temperature is 300 K, and he is in a room that is at a temperature of 290 K? The Stefan-Boltzmann constant is 5
67 × 10-8 W/(m2?K4). A) 60.3 W B) 62.6 W C) 65.7 W D) 68.4 W E) 64.8 W