Now desmond and cherie tackle a homework problem. two wave pulses travel on a string toward each other. the wave pulses can be described as y1 = 5 (kx − ωt)2 + 2 and y2 = −5 (kx + ωt − 6)2 + 2 , where k = 2 rad/m and ω = 5 rad/s. at what instant do the two cancel everywhere? (assume x is in meters and t is in seconds.)

Which statement is best supported by the information in the chart? wave y is moving the fastest. wave x is moving the fastest. all of the waves are moving at the same speed. all of the waves have the same value of wavelengths per second.

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg. how much energy e must be supplied to the device? express your answer in joules.