Consider a series RLC circuit with R =15 , L = 200 mH, C= 75F, and a maximum voltage of

120 V. (a) What is the impedance of the circuit at resonance? (b) What is the resonance frequency

of the circuit? (c) When will the current be greatest—at resonance, at ten percent below the

resonant frequency, or at ten percent above the resonant frequency? (d) What is the rms current in

the circuit at a frequency of 60 Hz

Which is an example of gaining a static charge by conduction? a) rubbing a balloon against your hair. b) shuffling your shoes across a carpet. c) bringing a charged rod near an electroscope. d) touching your car on a cold day and getting a shock.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?