Physics, 05.07.2019 01:20 samantha9430
Achild of mass 3m sits on a swing, the base of which has mass m, while the rope (of length l) q34. has a negligible mass. an adult pulls back the swing (with the child) until the rope makes an angle of half-a-radian with the vertical, and, then, pushes with a force mg along the arc of a circle until the rope is exactly vertical and releases it. if the rope was always taut, for how long did the adult push? 20 (а) л 3g 20 (d) 3g (b) 3 g g q49. two tuning forks with natural frequencies v, and v, respectively, are struck at the same time with equal force. the intensity, of the resulting sound, waxes and wanes with time period of 1.5 seconds while the frequency of the sound is 256 hz. hence v, and v, respectively are (a) 256.333 hz and 255.667 hz (b) 256.55 hz and 255.55 hz (d) 256.5 hz and 257 hz (c) 256 hz and 256.5 hz
Answers: 2
Physics, 22.06.2019 01:30
An object of dimensions 50 cm x 40 cm x 0.20 cm has a mass 60g. find its density in g/cm3 and kg/ m3
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Physics, 22.06.2019 06:30
Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)
Answers: 1
Physics, 22.06.2019 12:10
Energy flows from the producer level to the level. is called
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Physics, 22.06.2019 13:40
An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.
Answers: 2
Achild of mass 3m sits on a swing, the base of which has mass m, while the rope (of length l) q34. h...
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