The first law of thermodynamics states that heat added to a closed system can change the internal energy of the system and/or do ______________
Fill in the blank(s) with correct word
work
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The idea that other civilizations are waiting for us to reach a certain technological level before revealing themselves to us is referred to as the
A) conspiracy hypothesis B) UFO hypothesis C) sentinel hypothesis D) zoo hypothesis
Which characterizes the magnetosphere/strength of magnetic fields on Jupiter?
A. the same as on Earth so that it has aurora B. completely absent C. weaker than that on Earth, but it still has aurora D. a thousand times that on Earth so that it cannot have aurora E. ten times stronger than Earth so that it has aurora
Two point charges each have a value of 30.0 mC and are separated by a distance of 3.00 cm. What is the electric field midway between the two charges? (ke = 8.99 × 10^9 N•m2/C2)
a. 40.5 × 10^7 N/C c. zero b. 20.3 × 10^7 N/C d. 10.1 × 10^7 N/C
The total number of stars in the observable universe is about
A) 100 billion. B) the same as the number of grains of sand in a school sandbox. C) the same as the number of grains of sand on all the beaches on Earth. D) the same as the number of atoms that make up the Earth.