Which source is most likely an authority on the subject? dr. vale, a pediatrician, discusses electrical circuitry on her home-improvement website. jonah, an amateur cook, teaches his son how to make the best grilled cheese sandwiches. susan, an architect, presents her hand-made quilts at the quilting society. dr. patel, a cardiologist, presents her findings on heart disease.

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to:

Aheavy piece of hanging sculpture is suspended by a90-cm-long, 5.0 g steel wire. when the wind blows hard, the wire hums at its fundamental frequency of 80hz. what is the mass of the sculpture?