Figure 1 above shows an athlete's forearm holding a steel ball. The forearm is supported by a contraction of the biceps muscle, which causes a torque around the elbow. Assuming that the tension in the biceps acts along the vertical direction given by gravity and the centre of gravity of the forearm is half of L. What tension must the biceps muscle exert to hold the forearm at the position shown? Sketch and label your free body diagram. (Let L= 33.5 cm, d = 3.8 cm, mass of steel ball = 280 g, mass of the forearm = 2.5 kg)

Select light for the type of wave, adjust the wavelength so that the light is red, and increase the amplitude of the light to the max. then, select the start button at the source location to begin producing the waves. light is a form of electromagnetic wave, containing oscillating electric and magnetic fields. the wave amplitude detector mentioned above shows how the electric field oscillates in time at the location of the probe. the amplitude of the wave at the location of the probe is equal to the maximum electric field measured. how does the amplitude of the wave depend on the distance from the source?