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A plastic ball with internal diameter of 1.00 m is filled with air. The ball is attached to a uniform steel cable that has a radius of 1.00 cm and 10.0 m long. A) What mass of lead weight must be attached to the bottom of the cable to have the ball exactly half submerged when thrown into a fresh water lake? B) What is the gauge pressure at the top of the lead block? Assume that the weight of the ball is negligible and that the lake is deep enough that it does not hit the bottom.
The densities of air, steel and lead are 1.20, 7800 and 11300 kg/m3 respectively.
A 200-Volt battery is connected to a parallel-plate capacitor that has a dielectric slab (k= 2) filling the space between the plates. The plates are 10cm x 10cm and are 3mm apart.
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Frank and Mary are twins, and Mary wants to travel to our nearest star system, Alpha Centauri (4.30 lightyears away). How old will Frank be when she returns
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