Atrained singer can release 4 liters of air from his/her lungs after each deep breath. from the triangular waveform (rossing, fig. 15.6), we can estimate that each puff of air contains 2.0 cm3 (2.0 x 10-3 liters). if the singer sounds the e3 note (165 hz), there are air puffs emitted per second.

Brutus, the dog, is pulling a bone to the left with a force of 20 n. lassie, another dog, is pulling a bone to the right with a force of 18n. what is the net force? a. b. c.

Inside of a windmill or a dam is a that is used to transform one type of energy into electrical energy. a. motor b. generator c. transformer d. power pack

Which statement correctly describes the current in a circuit that is made up of any two resistors connected in parallel with a battery? a. the current in the battery and in each resistor is the same b. the current the battery equals to the sum of the currents in the resistors c.the current in the battery is less than the current in either resistor d. the current in the battery equals to the product of the currents in the resistors