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Author Question: The speed of sound through the ground is about 6.0 km/s while the speed of sound in air is 343 m/s. ... (Read 138 times)

mwit1967

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on: Jul 29, 2018
The speed of sound through the ground is about 6.0 km/s while the speed of sound in air is 343 m/s. A very powerful explosion occurs some distance away and you feel the ground vibrate 60 seconds before you hear the sound of the explosion.
 
  How far away is the explosion? A) 20 km
  B) 22 km
  C) 25 km
  D) 27 km
  E) 30 km

Question 2

A mountain climber encounters a crevasse in an ice field. The opposite side of the crevasse is a height h lower, and is separated horizontally by a distance w.
 
  To cross the crevasse, the climber gets a running start and jumps in the horizontal direction. If the height of the crevasse increases but the width remains the same, then, A) the minimum speed needed to cross the crevasse increases.
  B) the minimum speed needed to cross the crevasse decreases.
  C) the minimum speed needed to cross the crevasse stays the same
  D) the minimum speed needed to cross the crevasse will depend on the mass of the mountain climber.
  E) the minimum speed needed to cross the crevasse will depend on the weight of the mountain climber.
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shaikhs

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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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mwit1967

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Reply 2 on: Jul 29, 2018
Excellent

ricroger

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Reply 3 on: Yesterday
Gracias!

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