Han stands at the rim of the Grand Canyon and yodels down to the bottom. He hears the yodel echo back from the canyon 5.20 seconds later. If sound travels at 340 m/s in air, how deep is the canyon at this location? [Hint: The answer is not equal to 1768 meters]

1) a child holds two dogs on two separate leads. the dogs are pulling in different directions. one is pulling a force of 20n north and one is pulling 15n eastwards. calculate the resultant force on the child. state the direction. (use the parallelogram of forces) 2) a force of 20n acts horizontally on an object. a second force of 5n acts at 60 degrees to the first one. calculate the resultant force. worth 20 points, need answers asap with method you x