The presently known laws of physics clearly describe the conditions inside a black hole's event horizon
Indicate whether the statement is true or false
FALSE
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The Himalayan Mountains are rugged, jagged peaks and the Appalachians are smooth and rolling. Why is there a difference?
a. The Himalayas are much older and the rocks have begun breaking off. b. The Himalayas are volcanic mountains and the Appalachians are not. c. The Appalachians are much older and have been smoothed by erosion. d. The Appalachians are younger and just started to be thrust upward by plate tectonics. e. a and d
An electron inside a hydrogen atom is confined to within a space of about 0.12 nm
What is the uncertainty in this electron's speed? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s) A) 3.1 × 105 m/s B) 3.1 km/s C) 4.8 × 106 m/s D) 4.8 m/s E) 9.6 × 105 m/s
A light ray goes through two thick rectangular slabs of glass, each of the same uniform thickness. The first slab has index of refraction n1 and the second n2 . If n1< n2. How does the original angle of incidence 
into the first slab compare to the final angle of refraction where the ray leaves the second slab going back into air?
A. 
B. 
C. 
D. 
E. more information is needed
How long will it take a 7.08 hp motor to lift a 250 kg beam directly upward at constant velocity from the ground to a height of 45.0 m? Assume frictional forces are negligible. (1 hp = 746 W)
A) 20.9 s B) 1.56 × 104 s C) 2.18 × 104 s D) 39.7 s