Physics

D Question 8 2 pts There is a 249 m high cliff at Half Dome in Yosemite National Park in California. Suppose a boulder breaks loose from the top of this cliff. Assuming a reaction time of 0.29 s, how long will a tourist at the bottom have to get out of the way after hearing the sound of the rock breaking loose (neglecting the height of the tourist, which would become negligible anyway if hit)? The speed of sound is 338 m/s on this day. Please use g = 9.80 ms 2 and give your answer to 3 significant figures. D Question 9 2 pts An express train passes through a station. It enters with an initial velocity of 25.0 m/s and decelerates at a rate of 0.131 ms"2 as it goes through. The station is 167 m long. How long did the nose of the train stay in the station? Please give your answer to three significant figures. D Question 10 2 pts In World War II, there were several reported cases of airmen who jumped from their flaming airplanes with no parachute to escape certain death. Some fell about 6000 m, and some of them survived, with few life-threatening injuries. For these lucky pilots, the tree branches and snow drifts on the ground allowed their deceleration to be relatively small. If we assume that a pilot's speed just prior to impact was 38.7 m/s, and that the trees and snow stopped him over a distance of 11.3 m then what was his acceleration during impact? Please give your answer to 3 significant figures