Once a terrestrial planet had formed from a large number of planetesimals, heat could have melted it and allowed it to differentiate into a metallic core of ____________density and a rocky mantle or crust of ____________ density
a. higher; lower
b. lower; higher
c. Wrong! The interior stays solid.
d. Wrong! There is no separation according to density.
a
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A bucket of water with total mass 26 kg is attached to a rope, which in turn is wound around a 0.04-m radius cylinder at the top of a well. A crank with a turning radius of 0.20 m is attached to the end of the cylinder and the moment of inertia of cylinder and crank is 0.11 kg·m2 . If the bucket is raised to the top of the well and released, what is the acceleration of the bucket as it falls
toward the bottom of the well? (Assume rope's mass is negligible, that cylinder turns on frictionless bearings and that g = 9.8 m/s2.) a. 1.9 m/s2 b. 2.7 m/s2 c. 9.8 m/s2 d. 7.9 m/s2 e. 7.1 m/s2
A proton is moving in an electric field. The direction of the acceleration of the proton is
A. in the direction the proton is moving. B. opposite the direction the proton is moving. C. perpendicular to the direction the proton is moving. D. in the direction of the electric field. E. opposite the direction of the electric field.
A brake pad is used to give a normal force of 150N to the outer surface of a 0.25kg spinning disk, in order to slow it down from 250rpm to rest. The disk’s radius is 0.25m. If the coefficient of friction between the pad and the disk is 0.45, how much time was required for the disk to slow from 250 rpm to rest?
A. 0.19s B. 0.55s C. 2.4s D. 12s
Suppose you find a meteorite made almost entirely of metal. According to current science, which of the following statements must be true?
A) Your meteorite is a fragment of an object from the Kuiper belt. B) Your meteorite is a fragment from the core of a large asteroid that shattered in a collision. C) Your meteorite was blasted off the surface of Mars by an impact. D) Radiometric dating will show the age of your meteorite to date to the formation of our solar system.