A 2.00 m by 3.00 m plate of aluminum has a mass of 324 kg. What is the thickness of the plate? (The density of aluminum is 2.70 × 103 kg/m3.)
What will be an ideal response?
2.00 cm
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Heat Engines: A certain automobile engine takes in 4.00 kJ of heat and performs 1.10 kJ of mechanical work in each cycle.(a) Calculate the engine's efficiency.(b) How much heat is "wasted" in each cycle?
What will be an ideal response?
A major advantage of a Newtonian reflector over a refractor is:
A) its compact size. B) the elimination of chromatic aberration. C) there are only two lenses to grind. D) the central hole in the mirror is smaller. E) the elimination of the secondary mirror.
What does the exclusion principle say?
A) No two particles of any type can ever occupy the same quantum state at the same time. B) If a particle has a precisely defined position it is excluded from having a precisely defined momentum. C) The laws of quantum mechanics are excluded from our common sense. D) Two fermions cannot occupy the same quantum state at the same time.
Which is a key difference between electric charges and magnetic poles?
a. Electric charges can be separated while magnetic poles always occur together as opposite poles of equal strength. b. Magnetic monopoles exist but isolated electric charges are never found. c. Like electric charges repel but like magnetic poles attract. d. An electrically charged rod attracts an electrically neutral object but a magnet does not attract and unmagnetized chunk of iron. e. In electricity, unlike charges repel, but in magnetism, unlike poles attract.