You are traveling quickly along a freeway. Your car has kinetic energy. You suddenly skid to a stop because of congestion in traffic. Where is the kinetic energy that your car once had?
1.All of it goes into internal energy in the road.
2.All of it goes into internal energy in the tires.
3.Some of it goes into internal energy of the road and some into internal energy of the tires.
4.Some of it goes into internal energy of the road, some to internal energy of the tires, some to other internal energy, and some is transferred away by mechanical waves.
4
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The reason that we observe more distant galaxies to be moving away from us at higher speeds than nearby galaxies is that
A) the more distant galaxies were flung outward faster by the Big Bang. B) the more distant galaxies are smaller and less massive, so they can move faster. C) the nearby galaxies are slowed by our own galaxy's gravitational pull. D) there is more space to expand between us and the distant galaxies.
After seeing a flash of lightning, if one counts the seconds before hearing the thunder, one can estimate the distance to the flash. How many seconds delay
(a) per mile? (b) per kilometer?
Synchrotron radiation produces a(n) ________ spectrum
A) continuous nonthermal B) emission line C) absorption line D) continuous, with some absorption lines E) continuous, with some emission lines
Which of the following is true?
1.Dimensional analysis can never give you the numerical value of constants of proportionality that may appear in an algebraic expression, but it can sometimes give the proper mathematical forms for the variables (such as whether they are squared, multiplied by each other, divided by each other, added together, or subtracted from each other). 2.Dimensional analysis can sometimes give you the numerical value of constants of proportionality that may appear in an algebraic expression, and it can sometimes give the proper mathematical forms for the variables (such as whether they are squared, multiplied by each other, divided by each other, added together, or subtracted from each other). 3.Dimensional analysis can never give you the numerical value of constants of proportionality that may appear in an algebraic expression and it can never give the proper mathematical forms for the variables. 4.Dimensional analysis can sometimes give you the numerical value of constants of proportionality that may appear in an algebraic expression, but it can never give the proper mathematical forms for the variables (such as whether they are squared, multiplied by each other, divided by each other, added together, or subtracted from each other).