What is the change in entropy (?S) when one mole of silver (101 g) is completely melted at 961°C? (The heat of fusion of silver is 8.82 × 10^4 J/kg.)
a. 9.27 J/K
b. 7.22 J/K
c. 3.61 J/K
d. 14.4 J/K
e. 5.22 J/K
b
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A car travels on a road that, if viewed from the side, has a semicircular dip. When at the bottom of the dip, the occupants of the car feel as though they weigh twice their normal weight. What is the radius of the semicircle if the speed of the car is 27 m/s?
A. 37 m B. 132 m C. 149 m D. 74 m
How strongly, and in what direction, does a 1-newton apple pull on Earth?
A) It pulls downward, with a force of 1 newton. B) It pulls upward, with a force of 1 newton. C) It pulls upward, with a force that is much smaller than 1 newton. D) The apple does not pull on Earth at all; it is Earth that pulls downward on the apple. E) It pulls upward, with a force that is much larger than 1 newton.
A puck on a frictionless air hockey table has a mass of 5.0 kg and is attached to a cord passing through a hole in the surface as in the figure. The puck is revolving at a distance 2.0 m from the hole with an angular velocity of 3.0 rad/s. The angular momentum of the puck (in kg?m2/s) is
a.
80
b.
20
c.
30
d.
60
e.
50
A 2 000-kg sailboat experiences an eastward force of 3 000 N by the ocean tide and a wind force against its sails of magnitude 6 000 N directed toward the northwest (45° N of W). What is the magnitude and direction of the resultant acceleration?