Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degrees frictionless incline. The vertically hanging mass is 4.0 kg and the mass on the incline is 6.00 kg. The acceleration of the 4.00 kg mass is
A. 0.980 
B. 3.92
C. 5.75
D. 6.86
E. 7.84
A. 0.980
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The rotation of a body in which different parts of the body have different periods of rotation is referred to as _____
A) translational rotation B) periodical trajectory C) partial trajectory D) differential rotation
The surface area of Antarctica is 13.2 million square kilometers. If 1 acre is equivalent to 4047 
what is the surface area of Antarctica in acres?
a. 
b. 
c. 
d. 
e. 
f. 
As a star's evolution approaches the Type II supernova, we find:
A) the heavier the element, the less time it takes to make it. B) the heavier the element, the higher the temperature to fuse it. C) helium to carbon fusion takes at least 100 million K to start. D) photodisintegration of iron nuclei begins at 10 billion K to ignite the supernova. E) All of the above are correct.
Electrons with a speed of 2.1 × 106 m/s are directed towards a 1.0-?m wide slit. An electron detector is placed 1.0 m behind the slit
How wide is the central maximum of the electron diffraction pattern on the detector? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg) A) 690 ?m B) 350 ?m C) 1,000 ?m D) 1,400 ?m