Document MMm9zVER9GOba6EvzyX3rOLpM

For more facte circle 256 on Reader Service card, p 103 Technical briefs .Begins on poge 92; application parameters established foravailable short-circuit currents toS? 100.000- amp symmetrical. Enclosed^ safety switches and disconnects have* been tested with current-limiting fuses' for application on circuits with up to^ 200.000- amp symmetrical available!! on short circuit. AIEE 61-156 Nuclear developments Office of Technical Services, U.S.j| Department of Commerce papers interesting to energy-systems'* engineers: -'v 40-mwe prototype high-tem-^ perature gas-cooled-rcactor re*-i search and development program ~ (GA-1235), Sept 1960, 185 pp, $3.00.; Design study of sodium modu-\ Jar reactor (GE/1P-3334), Jan 1960, : 388 pp, S5.00 V Nuclear-superheat-project sec* ond quarterly progress report for Oct-Dec 1959 (GEAP-3371), Sept' 1960, 178 pp, $2.75 Quarterly status report of the; LASL plasma-thermocouple-de-; velopment program for period ending Sept 20, 1960 (LAMS' 2473), Oct 1960, 16 pp, 50^ . Liquid flui<lized*bed reactor ex periment: final report--TASK. 4.00 (MND-LFBR-2337), 136 pfr $2.75 r Thermophysical properties of irradiated polyphenyl coolants: Part II---density and viscosity (NAA-SR-4484), Dec 1960, 56 pp, S1.25 An evaluation of fossil super heat for nuclear-power plants (NY0-9400), Oct 1960, 297 pp, $3-50 Gas - cooled - reactor project quarterly progress report for pe* riod ending Sept 30, i960 (ORNL-3015), 174 pp, $2.75 Bettis Technical review: Ren* tor technology (WAPD-BT'20)i Sept 1960,131 pp, $2.50 Technical progress report** Pressurized-water reactor (p'vT) project for the period Aug 24 1960 to Oct 23, 1960 (WA?#' MRP-88), 97 pp, $2.25 Fabrication of Yankee core * prototype fuel element (YAEC` 244), May 1960, 52 pp, $1.25 Emissivity and emittance--` what are they? (PB-161-222), *>)' POWER MAY I**' INDUSTRIAL Find the Belmont Distributor nearest you in Conover-Mast Purchasing Directory or Thomas' Register Packing Sections THE MOST COMPLETE LINE OF MECHANICAL PACKINGS* Dependable Local Service Always Available Prompt Delivery ^ HIGH PRESSURE ASBESTOS ROTARY PUMP PACKINGS . VALVE PACKINGS .V-RINGS . LEATHER PACKINGS .SHEET PACKINGS AND GASKETS . HYDRAULIC & PNEUMATIC PACKINGS , METALLIC PACKINGS , PLASTIC PACKINGS . TEFLON PACKINGS & GASKETS .SPIRAL WOUND GASKETS getter Bwf BELMONT 108 For more facts circle 261 on Reader Service card, p 77 Physics refresher Begins on page 702 until it becomes zero at the horizontal ramp where the ball can't move. Success of experiments of this kind depend on having a perfectly bah.' anced, smooth ball and frictionless ramp. Timing is best done auto matically if possible. Varying initial velocity. In Fig. 5 we let the body start from rest, that is, zero velocity. Now let's study the effects of giving the body various initial velocities. We can assume up ward velocities as having a positive sign (4-) and downward velocities as negative (--). The acceleration of gravity g of course always acts in the downward or (--) direction. . J Fig. 6 shows curves of velocity vs" time for four different initial veloci ties: -j- 128.3 ft per sec, 64.4 fps,- 0 fps and -- 64.4 fps. For the first ' two the ball is initially thrown up ward, in the third the ball is simply dropped from zero velocity as in Fig. 5, and in the fourth the ball is thrown, downward at the start. Since g acts in the downward direction (--), all the velocities decrease uniformly with time in accordance with the basic equation (5). y These curves show that for the bodies thrown upward the velocities decrease steadily until they rgach zero; then they steadily increase in the downward or (--) direction. 1 Fig. 7 shows the vertical distances traveled by the bodies of Fig. 6. The body starting with 4-128.8 fps reaches a height of 257.6 ft above the starting point at 4 sec, and here its velocity becomes zero. Its velocity then grows downward or in the nega tive direction and it reaches the start ing point in 8 sec going at a velocity of -128.8 fps. The body leaving with an upward velocity of 64.4 fps reaches its high-; est point of 64.4 ft 2 sec after the; start; there its velocity becomes zero.' It returns to the starting point at 4^ sec with an = --64.4 fps and drops with increasing velocity for further fall. f The body with initial zero velocity^ drops with steadily increasing speedy The body with initial downward^ velocity of --64.4 fps uses the least^ time to reach lower elevations. Next part will deal with an motions and start on Newton's of motion. POWER JANUARY 196%