Determine the length of the lake

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Q. A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. She hears the echo 1.44 s after shouting. Determine the length of the lake. Assume the speed of sound to be 340 m/s.

Q. A 3.0-m-long rigid beam with a mass 140 kg is supported at each end. An 75 student stands 2.0 m from support 1.

How much upward force does support 1 exert on the beam?

How much upward force does support 2 exert on the beam?

Reference no: EM1357114

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