A 100 watt bulb emits light at p = 1 w light power. What is the power density at a distance of r=0. 1 and 1 m?.

magnitude and direction

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

wavelength divides in half and speed stays the same.

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.