Case 1: a dj starts up her phonograph player. the turntable accelerates uniformly from rest, and takes t₁ = 11.9 seconds to get up to its full speed of f₁ = 78 revolutions per minute. case 2: the dj then changes the speed of the turntable from f₁ = 78 to f₂ = 120 revolutions per minute. she notices that the turntable rotates exactly n₂= 15 times while accelerating uniformly. t₁ = 11.9 secondsn₂ = 11 timespart (a) calculate the angular speed of the turntable while it is turning at f₁ = 78 in radians/second in case 1.part (b) how many revolutions does the turntable make while accelerating in case 1? part (c) calculate the magnitude of the angular acceleration of the turntable in case 1, in radians/second².part (d) calculate the magnitude of the angular acceleration of the turntable (in radians/second²) while increasing to 120 rpm (case 2).part (e) how long (in seconds) does it take for the turntable to go from f₁ = 78 to f₂ = 120 rpm?
Answers: 3
Physics, 22.06.2019 02:50
Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.
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Physics, 22.06.2019 03:00
Dinate system, and a charge q = - 2.00 nc is placed s2 10 n> c. (a) what is the change in electric potential energy when the dipole moment of a molecule changes its orientation with respect to es from parallel to perpendicular? (b) at what absolute temperature t is the average translational kinetic energy 32 kt of a molecule equal to the change in potential energy calculated in part(: abovethistemperature,thermalagitationprevents the dipoles from aligning with the electric field.) placed in a uniform electric field e with magnitude 1.6 * 6 on the positive x-axis at x = 4.00 cm. (a) if a third charge q3 = +6.00 nc is now placed at the point x = 4.00 cm, y = 3.00 cm, find the x- and y-components of the total force exerted on this charge by the other two. (b) find the magnitude and direction of figure p21.62 ll uu 21.55 . torque on a dipole. an electric dipole with dipole moment ps is in a uniform external electric field es. (a) find the orientations of the dipole for which the torque on the dipole is zero. (b) which of the orientations in part (a) is stable, and which is unstable? (hint: consider a small rotation away from the equi- librium position and see what happens.) (c) show that for the stable orientation in part (b), the dipole’s own electric field tends to oppose the external field. 21.62 ..
Answers: 1
Physics, 22.06.2019 09:30
Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z
Answers: 3
Case 1: a dj starts up her phonograph player. the turntable accelerates uniformly from rest, and ta...
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