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.
Ground coffee magnified
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