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Author Question: A 7.5 1014 Hz laser emits a 7.7-s pulse, 5.0 mm in diameter, with a beam energy density of 0.51 ... (Read 88 times)

nramada

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on: Jul 29, 2018
A 7.5  1014 Hz laser emits a 7.7-s pulse, 5.0 mm in diameter, with a beam energy density of 0.51 J/m3.
 
  What is the amplitude of the electric field of the emitted waves? (c = 3.00  108 m/s, 0 = 4  10-7 T  m/A, 0 = 8.85  10-12 C2/N  m2)
  A) 120 kV/m B) 340 kV/m C) 480 kV/m D) 240 kV/m E) 150 kV/m

Question 2

A child is trying to throw a ball over a fence. She gives the ball an initial speed of 8.0 m/s at an angle of 40 above the horizontal. The ball leaves her hand 1.0 m above the ground and the fence is 2.0 m high.
 
  The ball just clears the fence while still traveling upwards and experiences no significant air resistance. How far is the child from the fence? A) 0.73 m
  B) 1.6 m
  C) 2.7 m
  D) 3.8 m
  E) 7.5 m
Physics ¦ Walker ¦ 5th Edition
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courtney_bruh

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Reply #1 on: Jul 29, 2018
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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nramada

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Reply 2 on: Jul 29, 2018
Excellent

cam1229

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Reply 3 on: Yesterday
:D TYSM

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