A guitar string has a mass per length of 2.33×10−3kg/m and a fundamental frequency of 146.8 hz when it is under a tension of 82.4 n. the string breaks, and its owner has only a spare string of mass per length 6.70×10−3kg/m.
A 15 kg child is sitting on a playground teeter-totter, 1.5 m from the pivot. what is the magnitude of the minimum force, applied 0.3 m on the other side of the pivot that is needed to make the child life off the ground
An rlc circuit has a resistance of 200 ???? and an inductance of 15 mh. its oscillation frequency is 7000 hz. at time t = 0 the current is 25 ma and there is no charge on the capacitor. after five complete cycles the current is:
A series rlc circuit consists of a 92.0 ω resistor, a 0.160 h inductor, and a 35.0 μf capacitor. it is attached to a 120 v/60 hz power line. what is the peak current i at this frequency
A roller-coaster car has a mass of 494 kg when fully loaded with passengers. (a) if the vehicle has a speed of 20.7 m/s at point a, what is the force in newtons exerted by the track on the car at this point?
A solid uniform disk of diameter 3.20 m and mass 42 kg rolls without slipping to the bottom of a hill, starting from rest. if the angular speed of the disk is 4.27 rad/s at the bottom, how high did it start on the hill?
A thick copper wire connected to a voltmeter surrounds a region of time-varying magnetic flux, and the voltmeter reads 13 volts. if instead of a single wire we use a coil of thick copper wire containing 21 turns, what does the voltmeter read?
A stream of air at 37°c and 50% relative humidity flowing at a rate of 1250 kg/h is to be cooled to 15°c and dehumidified in a spray tower. the air is saturated as it emerges from the tower. liquid water leaves the tower at 12°c; some is withdrawn, and the rest is cooled and […]
(8c32p7) suppose that a parallel-plate capacitor has circular plates with radius r = 70.0 mm and a plate separation of 5.7 mm. suppose also that a sinusoidal potential difference with a maximum value of 400 v and a frequency of 120 hz is applied across the plates; that is
Ball is thrown eastward into the air from the origin (in the direction of the positive x-axis). the initial velocity is 60 i + 80 k, with speed measured in feet per second. the spin of the ball results in a southward acceleration of 10 ft/s2, so the acceleration vector is a = −10 j […]
