A jogger with mass m= 55 kg uses energy at a rate of P = 558 W when she jogs on horizontal ground at a constant speed of s = 3.2 m/s. The efficiency of her "human engine" however, is e = 0.37. (In other words, the power used for locomotion is e = 0.37 times the total power.) Required:
a. Write an expression for the rate of energy expenditure when she jogs at the same constant speed up a slope of φ = 5.95 degrees. Assume whatever frictional or drag forces are the same in each case.
b. What is the rate of energy expenditure when she jogs up the slope, in watts?

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?

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600

Which of the following is a measure of the amount of light a star directly emits?               a.  luminosity    b.  intensity    c.  wavelength    d.  brightness