When water freezes, the entropy of the water
A) increases.
B) decreases.
C) does not change.
D) could either increase or decrease; it depends on other factors.
B
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Which of the following reaction energies is the least exothermic (but still an exothermic reaction)?
A) 540 kJ/mole B) -540 kJ/mole C) 125 kJ/mole D) -125 kJ/mole E) not enough information given
A projectile is projected from the origin with a velocity of 15.0 m/s at an angle of 30.0 degrees above the horizontal. What is the location of the projectile 2.00 seconds later?
A. X = 4.60 m, Y = 9.60 m B. X = -26.0 m, Y = -26.0 m C. X = -36.0 m, Y = -4.60 m D. X = 26.0 m, Y = -4.60 m E. X = 46.0 m, Y = 4.60 m
You and Mae are in free-float frames. Mae has just passed you, traveling at a speed of 60 km/hr. You throw a ball toward her at a speed of 60 km/hr. What will Mae see the ball doing?
A) She'll see the ball coming toward her at 60 km/hr. B) The ball will be stationary, floating freely in her own reference frame. C) She'll see the ball moving away from her at 60 km/hr. D) She'll see the ball coming toward her at 120 km/hr.
Two identical particles, each with a mass of 4.5 ?g and a charge of 30 nC, are moving directly toward each other with equal speeds of 4.0 m/s at an instant when the distance separating the two is equal to 25 cm. How far apart will they be when closest to one another?
a. 9.8 cm b. 12 cm c. 7.8 cm d. 15 cm e. 20 cm