Astronomy Astrophysics

Back-of-the-Envelope Physics by Clifford Swartz

By Clifford Swartz

Physicists use "back-of-the-envelope" estimates to envision even if an concept may very well be correct. in lots of situations, the approximate answer is all that's wanted. This compilation of one hundred and one examples of back-of-the-envelope calculations celebrates a quantitative method of fixing physics difficulties. Drawing on a life of physics learn and approximately 3 a long time because the editor of The Physics instructor, Clifford Swartz presents basic, approximate suggestions to physics difficulties that span a vast variety of issues. What observe do you get in the event you blow around the most sensible of a Coke bottle? may well you drop pounds on a nutrition of ice cubes? How can a fakir lie on a mattress of nails with out getting harm? Does draining water within the northern hemisphere fairly swirl in a special course than its counterpart less than the equator? In each one case, just a couple of traces of mathematics and some normal constants resolve an issue to inside of a number of percentage. overlaying such topics as astronomy, magnetism, optics, sound, warmth, mechanics, waves, and electrical energy, the e-book offers a wealthy resource of fabric for academics and someone attracted to the physics of lifestyle.

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Launch Vehicle: Tsyklon 2. Mass: 3800 kg. Perigee: 790 km. Apogee: 810 km. 0o. — 10 July 1987 Cosmos-1867 Programme: RORSAT. Launch Site: Baikonur. Mass: 3800 kg. Perigee: 797 km. Apogee: 813 km. 0o. The NPS used with the first of the spacecraft (Cosmos-1818) operated for 142 d and the second one (Cosmos-1867) for 342 d. In both cases the NPS operation was terminated as planned when the caesium stock was exhausted. The test programme objectives were fulfilled for both units. The flight test results confirmed the TOPAZ NPS output parameters and that operation in terrestrial conditions agreed with those in space.

RADIATOR TEMP. 43% 30 V 761 K FIG. 12. SNAP-10A power conversion system. Source: Atomics International. 20 REFLECTOR (BeO) INSULATION (ZrO2) DRIVE SHAFT RETAINER BANDS (Mo) TIE-DOWN BARS (Mo–Re) FUEL MODULES HEAT PIPE (Mo–Re/Li) FUEL LAYERS (UO2/Mo–Re) ABSORBER SEGMENT (B4C) CONTROL DRUMS (Be) DRUM BEARING REFLECTOR (Be) SAFETY PLUG CAP (Be) CORE CONTAINMENT (Mo–Re) THERMAL INSULATION (MULTIFOIL) FIG. 13. Distributed cooled (liquid metal) space reactor. Source: Los Alamos National Laboratory. However, the materials technology and proof of that technology have been completed in the non-space liquid metal fast breeder reactor programme.

By 2001, China’s capability with regard to the development of meteorological and earth resource satellites had reached the international level of the 1990s. The six telecommunication, earth resource and meteorological satellites developed and launched by China in the past few years are in stable operation and have generated remarkable social and economic returns. China also has a vigorous programme (Shenzhou) aimed at developing a manned spacecraft. The unmanned Shenzou IV space capsule orbited the earth for seven days in December 2002.

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