2 An a. c. source is connected to an oscilloscope. The waveform of the alternating potential
difference from the source is displayed on the oscilloscope screen as below.
a) The Y-gain setting of the oscilloscope is 2.0 V/cm. Determine the amplitude of the
alternating potential difference.
c) The time-base setting of the oscilloscope is 0.010 seconds per cm.
Determine the frequency of the alternating potential difference.

Newton's first law describes something special that results from the sum of all the external forces (including gravity) on an object. 

Distance covered, s = 8ft - 4ft = 4 ftinitial velocity, u = 34 ft/sthe acrobat is moving upwards and therefore, a = -g = -9.81 m/s^2 = 32.19 ft/s^2applying equation of motion; s = ut -1/2gt^2then,4 = 34t -1/2*32.19t^24 = 34t - 16.095t^2rearranging; -16.095t^2 + 34t - 4 = 0solving the quadratic equation; t = {-34 +/- sqrt [34^2 - 4(-16.)]}/2(-16.095) = 1.06 +/- 0.93 = 0.13 or 1.99the acrobat will take 0.13 seconds to be at 8 ft above the ground. additionally, once at the maximum height, the acrobat will move down and be at the same spot (that is height) after 1.99 seconds moving down.

B. that is the answer