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Chapter 1: Q48P (page 11)
The common Eastern mole, a mammal, typically has a mass of , which corresponds to about of atoms. (A mole of atoms is.) In atomic mass units (u), what is the average mass of the atoms in the common Eastern mole?
The average mass of the atoms in the common Eastern mole is.
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Figure shows a flat construction of two circular rings that have a common center and are held together by three rods of negligible mass. The construction, which is initially at rest, can rotate around the common center (like a merry-go-round), where another rod of negligible mass lies. The mass, inner radius, and outer radius of the rings are given in the following table. A tangential force of magnitude is applied to the outer edge of the outer ring for .What is the change in the angular speed of the construction during the time interval?
Ring | Mass (kg) | Inner Radius (m) | Outer Radius (m ) |
1 | 0.120 | 0.0160 | 0.0450 |
2 | 0.24 | 0.0900 | 0.1400 |
Question: Antarctica is roughly semicircular, with a radius of 2000 km (Fig. 1-5). The average thickness of its ice cover is 3000 m. How many cubic centimeters of ice does Antarctica contain? (Ignore the curvature of Earth.)
Figure 1-5Problem 9
Question: Horses are to race over a certain English meadow for a distance of. What is the race distance in (a) rods and (b) chains? ( 1 furlong = 201.168m, 1 rod = 5.0292 m and 1 chain =20.117 m)
Four identical particles of mass 0.50kg each are placed at the vertices of a square and held there by four massless rods, which form the sides of the square. What is the rotational inertia of this rigid body about an axis that (a) passes through the midpoints of opposite sides and lies in the plane of the square, (b) passes through the midpoint of one of the sides and is perpendicular to the plane of the square, and (c) lies in the plane of the square and passes through two diagonally opposite particles?
You are to fix dinners for 400 people at a convention of Mexican food fans. Your recipe calls for 2 jalapeño peppers per serving (one serving per person). However, you have only habanero peppers on hand. The spiciness of peppers is measured in terms of the scoville heat unit (SHU). On average, one jalapeño pepper has a spiciness of 4000 SHU and one habanero pepper has a spiciness of 300000 SHU. To get the desired spiciness, how many habanero peppers should you substitute for the jalapeño peppers in the recipe for the 400 dinners?
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