It would be easier to pull evacuated Magdeburg hemispheres apart if they were
A) held upside down.
B) at sea level.
C) 2 km beneath the ocean surface.
D) 2 km above the ocean surface.
E) none of the above
Answer: D
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Addition by 1. Components: Vector 
has a magnitude of 6.0 m and points 30° east of south. Vector 
has a magnitude of 4.0 m and points 30° west of north. The resultant vector 
+ 
is given by
A. 2.0 m at an angle of 30° north of west. B. 2.0 m at an angle of 30° east of south. C. 10.0 m at an angle of 60° north of west. D. 10.0 m at an angle of 60° east of south. E. 1.0 m at an angle of 60° north of west.
A diffraction grating has 5000 lines per cm. The angle between the central maximum and the fourth order maximum is 47.2°. What is the wavelength of the light?
A) 138 nm B) 183 nm C) 367 nm D) 452 nm E) 637 nm
A bus is designed to draw its power from a rotating flywheel that is brought up to its maximum speed (3000 rpm) by an electric motor. The flywheel is a solid cylinder of mass 250 kg and radius 0.500 m (Icylinder = MR2/2). If the bus requires an average power of 10.0 kW, how long will the flywheel rotate?
a. 154 s c. 463 s b. 308 s d. 617 s
The maximum magnification of a typical light optical microscope is
(a) 100,000 times (b) 10,000 times (c) 1000 times (d) 100 times