1177450867

# 1177450867 - HW Chapter 7 7.10 Jumping Flea. High-speed...

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HW Chapter 7 7.10 Jumping Flea . High-speed motion pictures (3500 frames/second) of a jumping 210 μ g flea yielded the data to plot the graph shown in Fig. 7.26. This flea is about 2 mm long and jumped at a nearly vertical take-off angle. a) Find the maximum height above the ground reached by the flea. (Can you ignore the distance traveled by the flea before its speed becomes constant? Explain.) b) How much work was done by the flea in launching itself into the air? Fig. 7.26 7.14 Pendulum . A small rock with mass 0.12 kg is fastened to a massless string with length 0.80 m to form a pendulum. The pendulum is swinging so as to make a maximum angle of 45 ° with the vertical. Air resistance is negligible. a) What is the speed of the rock when the string passes through the vertical position? b) What is the tension in the string when it makes an angle of 45 ° with the vertical? c) What is the tension in the string as it passes through the vertical? 7.17

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## This note was uploaded on 09/08/2008 for the course PHYS 4A taught by Professor D.v during the Spring '07 term at Evergreen Valley.

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1177450867 - HW Chapter 7 7.10 Jumping Flea. High-speed...

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