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Chapter 1: Q21P (page 9)
Question:Earth has a mass of . The average mass of the atoms that make up Earth is 40 u. How many atoms are there in Earth?
Answer
The number of atoms in Earth is .
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During heavy rain, a section of a mountainside measuring 2.5 km horizontally, 0.80 km up along the slope, and 2.0 m deep slips into a valley in a mud slide. Assume that the mud ends up uniformly distributed over a surface area of the valley measuring 0.40 km 脳 0.40 km and that mud has a density of. What is the mass of the mud sitting above a 4.0 m2 area of the valley floor?
A projectile is shot directly away from Earth鈥檚 surface.Neglect the rotation of Earth. What multiple of Earth鈥檚 radius gives the radial distance a projectile reaches if (a) its initial speed is of the escape speed from Earth and(b) its initial kinetic energy is of the kinetic energy required to escape Earth?(c)What is the least initial mechanical energy required at launch if the projectile is to escape Earth?
Question: Figure shows the output from a pressure monitor mounted at a point along the path taken by a sound wave of single frequency traveling at343 m/sthrough air with a uniform density of 1.12 kg/m3 . The vertical axis scale is set by .If the displacement function of the wave is what are (a) sm (b) k (c) ? The air is then cooled so that its density is 1.35 kg/m3 and the speed of a sound wave through it is 320 m/s. The sound source again emits the sound wave at the same frequency and same pressure amplitude. Find the following quantities (d) sm (e) k (f) ?
A 10 kg brick moves along an x axis. Its acceleration as a function of its position is shown in Fig.7-38. The scale of the figure鈥檚 vertical axis is set by as 20.0 m/s2. What is the net work performed on the brick by the force causing the acceleration as the brick moves from ?
A unit of time sometimes used in microscopic physics is the shake. One shake equals s. Are there more shakes in a second than there are seconds in a year? (b) Humans have existed for about years, whereas the universe is about years old. If the age of the universe is defined as 鈥渦niverse day,鈥� where a universe day consists of 鈥渦niverse seconds鈥� as a normal day consists of normal seconds, how many universe seconds have humans existed?
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