Is it possible for heat to travel from a cold object to a hotter object?
What will be an ideal response?
Yes (your refrigerator does this all the time), but only with the expenditure of work.
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Suppose you have two small photographs of the Moon. Although both look the same at small size, when you blow them up to poster size one of them still looks sharp while the other one becomes fuzzy (grainy) looking
Which of the following statements is true? A) The one that still looks sharp at large size has better (smaller) angular resolution than the one that looks fuzzy. B) The one that looks fuzzy at large size has better angular resolution (smaller) than the one that looks sharp. C) Both photographs have the same angular resolution, because they were both printed at the same sizes in each case. D) Both photographs have the same angular resolution, because they are both photographs of the same object.
One morning you discover that a tire on your auto is in need of air. As you add air to the tire, which of the following statements is true?
A. The density of the air in the tire gets smaller B. The number of atoms of air in the tire stays the same C. The pressure of the air in the tire increases D. All of these statements are true
Although stars much more luminous than our Sun have wider habitable zones, planets around them are unlikely to have developed life because high luminosity stars
A) have extremely short lifetimes of the order of millions of years B) are not expected to form rocky, terrestrial planets C) emit very high levels of short wavelength radiation D) are very unstable
Your weight is
A) another word for your mass. B) the gravitational attraction between you and Earth. C) a property of mechanical equilibrium. D) the same in all locations.