1) When a 518-g spring is stretched to a total length of 23 cm, it supports transverse waves propagating at 3.0 m/s. When it's stretched to 62 cm, the waves propagate at 15 m/s. Calculate the spring's constant. Please report k in N/m to 0 decimal places. 2) You're working for the summer with an ornithologist who knows you've studied physics. She asks you for a noninvasive way to measure birds' masses. You propose using a bird feeder in the shape of a 48-cm-diameter disk of mass 388 g, suspended by a wire with torsional constant 5.8 Nm/rad. Two birds land on opposite sides and the feeder goes into torsional oscillation at 2.8 Hz. Assuming the birds have the same mass, calculate the mass of a single bird. Please report your mass in grams to 1 decimal place