Physics, 26.07.2019 04:20, lydialinton23
Astring is wrapped around a uniform disk of mass m = 1.2 kg and radius r = 0.07 m. (recall that the moment of inertia of a uniform disk is (1/2)mr2.) attached to the disk are four low-mass rods of radius b = 0.11 m, each with a small mass m = 0.5 kg at the end. the device is initially at rest on a nearly frictionless surface. then you pull the string with a constant force f = 29 n. at the instant when the center of the disk has moved a distance d = 0.039 m, a length w = 0.023 m of string has unwound off the disk.(a) at this instant, what is the speed of the center of the apparatus? v = ? m/s(b) at this instant, what is the angular speed of the apparatus? w1 = ? radians/s(c) you keep pulling with constant force 29 n for an additional 0.022 s. now what is the angular speed of the apparatus? w2 = ? radians/s
Answers: 3
Physics, 22.06.2019 00:30, kittykat8317
There are weak or strong attractive forces between atoms of liquids with a high viscosity
Answers: 3
Physics, 22.06.2019 02:50, antcobra
20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.
Answers: 3
Physics, 22.06.2019 14:20, jeny89
4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)
Answers: 3
Astring is wrapped around a uniform disk of mass m = 1.2 kg and radius r = 0.07 m. (recall that the...
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