The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively. An object is placed at 0.30 cm
from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain (with the eye focused at the far point). The near point of the person using the microscope is 25 cm and the far point is at infinity. What is the final overall magnification of the microscope?
A) -190 x
B) -240 x
C) -300 x
D) -320 x
E) -470 x
C
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Jupiter gives back into space twice the energy it gets from the distant Sun. Where is this energy coming from, for the most part?
A) the impact energy of comets like SL-9 B) helium rain descending into its mantle and core C) the slow escape of gravitational energy left from its formation D) the radioactive decay of U-238 in its iron-rich core, just as with the Earth E) the combined tidal stress of all four large Galilean moons
King Kong falls from the top of the Empire State Building, through the air (air friction is present), to the ground below
How does his kinetic energy (K) just before striking the ground compare to his potential energy (U) at the top of the building? A) K is equal to U. B) K is less than U. C) K is greater than U. D) It is impossible to tell.
If the distance between a point mass and the pivot point is tripled, the rotational inertia of the object about that point is multiplied by
A. 9 B. 3 C. 1/3 D. 1/9
The wheelbase on a 50,000-kg truck is 2.40 m wide and the truck's center of mass is located along the vertical centerline of the truck and 2.00 m above the bottom of the tires. The truck is going around a horizontal turn with a radius of 180 m
What is the maximum speed at which the truck can go around the curve without some of its tires lifting off the road? A) 44.3 m/s B) 38.2 m/s C) 32.5 m/s D) 28.2 m/s E) 25.0 m/s