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Author Question: A physics professor pushes against a stationary wall, working up a sweat. Is he doing any actual ... (Read 70 times)

asmith134

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on: Jul 29, 2018
A physics professor pushes against a stationary wall, working up a sweat. Is he doing any actual physical work on the wall?
 
  A) No--it's a law of nature that physics profs never do any actual work.
  B) No, because the force by his hands against the wall is balanced by the force by the wall pushing back.
  C) Yes, because he is exerting a force against the wall during a period of time.
  D) No, because the wall is not moving.
  E) Yes, because his arm muscles are moving other muscles through a distance.

Question 2

A projectile is fired from ground level with a speed of 150 m/s at an angle 30 above the horizontal on an airless planet where g = 10.0 m/s2. What is the horizontal component of its velocity after 4.0 s?
 
  A) 38 m/s B) 75 m/s C) 150 m/s D) 130 m/s E) 35 m/s
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nickk12214

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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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asmith134

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Reply 2 on: Jul 29, 2018
Wow, this really help

nguyenhoanhat

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Reply 3 on: Yesterday
Excellent

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