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, 21.06.2019 15:30
Which of the following statements are true of solids? a.the particles do not vibrate. b.the particles are in a fixed location. c.they have strong intermolecular forces between the atoms or molecules. d.the particles have less kinetic energy than those of liquids or gases.
Answers: 1
Physics, 22.06.2019 12:30
Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=
Answers: 2
Physics, 22.06.2019 15:00
Amoving company collects data about couches they move and displays the data in a table. the force along the ramp, the angle of the ramp, and the height the couch is raised to are shown. which statements correctly compare the work done to move the couches? check all that apply. the same amount of work is done for couches 1 and 3. the same amount of work is done for couches 2 and 3. the work for couch 1 is greater than the work for couch 2. the work for couch 2 is less than the work for couch 3. the work for couch 3 is greater than the work for couch 1. the work for couch 2 is greater than the work for couch 1.
Answers: 1
Physics, 22.06.2019 21:30
The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? a b c d
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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