To assess a patient who is suspected of having heart disease, the physician must examine the cardiac function when (a) the patient is at rest with a heart beating at a normal pace, and (b) when under stress, for example, after exercise. To simulate the conditions of stress, the patient exercises by walking a treadmill to increase heart beat and sustain high levels of cardiac stress. Suppose a 50 kg patient exercises on the treadmill, angled at 30◦ from the ground, exerting a constant force of 500 N up the slope of the treadmill while running a constant velocity of 4 m/s along the treadmill for 5 minutes. The coefficient of friction of the treadmill is µs = 0.45. Determine the work done by the patient.

To assess a patient who is suspected of having heart disease, the physician must examine the cardiac function when (a) the patient is at rest with a heart beating at a normal pace, and (b) when under stress, for example, after exercise. To simulate the conditions of stress, the patient exercises by walking a treadmill to increase heart beat and sustain high levels of cardiac stress. Suppose a 50 kg patient exercises on the treadmill, angled at 30◦ from the ground, exerting a constant force of 500 N up the slope of the treadmill while running a constant velocity of 4 m/s along the treadmill for 5 minutes. The coefficient of friction of the treadmill is µs = 0.45. Determine the work done by the patient.