In which of the following cases would the maximum "contact pressure" from the floor on a person be the least?
1.when the person is lying down on the floor
2.when the person is sitting on the floor
3.when the person is standing on the floor
4.when the person is standing on their tip-toes on the floor
1
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Springs: A very light ideal spring stretches by 21.0 cm when it is used to hang a 135-N object. What is the weight of a piece of electronic equipment that would stretch the spring by 44.9 cm if you hung the equipment using the spring?
A. 289 N B. 63 N C. 176 N D. 405 N
Find the how much mechanical energy was converted to internal energy in the system box-surface-Earth when a box moves in a complete circle of radius on a uniform horizontal floor
The coefficient of kinetic friction between the floor and the box is 0.25, and the box weighs A) 190 J B) 0 J C) 1800 J D) 370 J
A fully charged parallel-plate capacitor remains connected to a battery while a dielectric is slid between the plates. Does DV increase, decrease, or stay the same?
1.increase 2.decrease 3.remains the same
A large, metallic, spherical shell has no net charge. It is supported on an insulating stand and has a small hole at the top. A small tack with charge Q is lowered on a silk thread through the hole into the interior of the shell. What is the charge on the outer surface of the shell?
1.Q 2.Q/2 3.0 4.-Q/2 5.-Q