Suppose we take a disk of radius R and remove the material from r = 0 to r = R, making a hole at the center of the disk. Note that this decreases the mass of the disk. Will the value of ? for the new object be larger, smaller, or the same as that for the original object?
A. The value of ? will be larger for the new object.
B. The value of ? will be smaller for the new object.
C. The value of ? is the same for both objects.
D. We need to know the disk’s thickness to answer.
A. The value of ? will be larger for the new object.
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An ideal gas at a temperature of 39
has a pressure of 2.00 atmospheres and a volume of 2.10 liters. What is the temperature if the pressure is halved and the volume is tripled?
A. 155
B. 175
C. 188
D. 195
E. 204
A certain automobile tire has a volume of 0.0185 m3. If the absolute (or total) pressure in the tire is 500 kPa and the temperature is 298 K, how many molecules are there inside the tire? (R = 8.31 J/mol ? K, NA = 6.022 × 1023 molecules/mol)
A) 2.25 × 1023 molecules B) 2.25 × 1024 molecules C) 3.25 × 1023 molecules D) 3.25 × 1024 molecules E) 3.25 × 1025 molecules
The thermal conductivity of a certain concrete is 0.80 W/m . K and the thermal conductivity of a certain wood is 0.10 W/m ? K
How thick would a solid concrete wall have to be in order to have the same rate of heat flow through it as an 8.0-cm thick wall made of solid wood? Both walls have the same surface area and the same temperature difference across their faces. A) 53 cm B) 71 cm C) 85 cm D) 64 cm
Which of the following statements is true of Kuiper Belt Objects?
A) They are associated with the Jovian planets. B) Most of them are composed of liquid helium. C) Some of them have moons of their own. D) They are found in regions surrounding Jupiter's orbit.