When a car is weighed, it is allowed to move over a scale which records a reading as the front wheels go over the scale, and a second reading when the rear wheels go over the scale. The weight of the car is equal to
A) the weight under the front wheels.
B) the weight under the rear wheels.
C) the average of the two weights.
D) the sum of the two weights.
E) the difference of the two weights.
D
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A neutron star, which generates gamma-ray bursts due to "starquakes" on its surface, is called a(n) _______________
Fill in the blank(s) with correct word
How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10-19 J, mH ? mproton = 1.67 × 10-27 kg)
A) 44.2 km/s B) 21.7 km/s C) 66.5 km/s D) 113 km/s E) 51.0 km/s
The discovery that the Universe is expanding faster today than in the past was possible because of observations of
A. Cepheid variable stars. B. Type II (core collapse) supernovae. C. galaxy rotation curves. D. Type Ia (white dwarf) supernovae.
In a p-type semiconductor, a hole is
A) an extra proton supplied by a donor atom. B) an extra electron supplied by a donor atom. C) a donor atom. D) a region where an electron is missing. E) a missing atom in the crystalline structure.