David drinks a glass of water in his kitchen. The water is at room temperature, and David decides to make it colder by adding ice. Which of the following describes why the ice cubes will melt?
a. Liquid water is reacting with solid water to absorb energy
b. Water is evaporating from the surface of the water.
c. Slow-moving molecules move out of the ice.
d. Heat from the water moves into the ice.
Answer: d. Heat from the water moves into the ice.
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An object of mass 4 kg starts at rest from the top of a rough inclined plane of height 10 m as shown in Fig. 8-9
If the speed of the object at the bottom of the inclined plane is 10 m/s, how much work is done by the force of friction? Use g = 10 m/s2. A) -100 J B) 100 J C) 0 D) -200 J E) 200 J
The rigid object shown is rotated about an axis perpendicular to the paper and through point P. The total kinetic energy of the object as it rotates is equal to 1.4 J. If M = 1.3 kg and L = 0.50 m, what is the angular velocity of the object? Neglect the mass of the connecting rods and treat the masses as particles
a.
1.3 rad/s
b.
1.5 rad/s
c.
1.7 rad/s
d.
1.2 rad/s
e.
2.1 rad/s
A positive test charge is moved closer to a negative charge. The potential of the system ________ (indicate whether it increases, decreases, or stays the same).
Fill in the blank(s) with the appropriate word(s).
Resistors in Combination: Three light bulbs, A, B, and C, have electrical ratings as follows:Bulb A: 96.0 W, 1.70 ABulb B: 80.0 V, 205 WBulb C: 120 V, 0.400 AThese three bulbs are connected in a circuit across a 150-V voltage power source, as shown in the figure. Assume that the filament resistances of the light bulbs are constant and independent of operating conditions. What is the equivalent resistance of this combination of bulbs between the terminals of the power source?
A. 61.5 ? B. 15.3 ? C. 74.0 ? D. 86.2 ? E. 364 ?