If the inner and outer radii of the groove on
an LP are 10 cm and 5 cm, what is the linear speed of the phonograph needle at the
beginning and at the end of play, respectively? (A standard LP rotates at the speed
of 33.3333 rev/min.)
1. 17.5 cm/s at both
2. 35 cm/s and 17.5 cm/s
3. 17.5 cm/s and 8.75 cm/s
4. 70 cm/s and 35 cm/s
5. 35 cm/s at both

1. a camcorder has a power rating of 19 watts. if the output voltage from its battery is 7 volts, what current does it use?answer units 2. a 1.5m wire carries a 6 a current when a potential difference of 57 v is applied. what is the resistance of the wire? your

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants

How can you measure the amplitude of a longitudinal wave?