When a glass rod rubbed with silk acquires a positive charge, the silk acquires
A. a positive charge
B. a negative charge
C. no charge
D. it is impossible to tell which sign of charge it acquires
B. a negative charge
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What is the purpose of the European CHEOPS mission?
A) to precisely measure the properties of known extrasolar planets B) to discover new types of extrasolar planets unobservable with current instruments C) to search for signals from alien civilizations D) to search for new extrasolar planets throughout the entire sky
Consider a 2.4 kilogram feather (Big Bird) on the planet Mars. [Earth mass = 6.0 × 1024 kg = 9.3 × Mars mass; Earth radius = 6380. km = 1.89 × Mars radius]
(a) What does the feather weigh on Mars? (b) What would the same feather weigh on Earth?
How many quark colors are there?
a. 1 b. 3 c. 6 d. none of the above
Why are galaxy collisions of interest?
A. Collisions are extremely rare. B. Collisions and mergers play an important role in shaping galaxies. C. Collisions generate hundreds of black holes. D. Collisions have a strong effect on the evolution of stars.