Stable equilibrium position
Fixed to the origin is a charge q = -0.320 nC. Is there a location, including the effects of gravi- ty, where a proton can be in equilibrium? Explain. If so, what is that location and is it a stable equilibrium position?
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A certain black box contains unknown resistances and sources of emfs connected in an unknown way such that (1) a 10 n resistor accrpss the terminals draws 1.0A and (2) and 18n resistor draws .60A. WHat resistance will draw 0.10A?
Air at 1 atm and 30 °C flows over a 15 cm square plate at a velocity of 10 m/s. Calculate the maximum boundary layer thickness.
Helium at atmospheric pressure and 30 °C flows across a square plate at a free stream velocity of 15 m/s. Calculate the boundary layer thickness at a position where Re = 250,000.
When you move up from the surface of the earth the gravitation is reduced as g = 9.807 - 3.32 × 10-6 z, with z as the elevation in meters. How many percent is the weight of an airplane reduced when it cruises at 11 000 m?
Two cylinders are filled with liquid water, ? = 1000 kg/m3, and connected by a line with a closed valve. A has 100 kg and B has 500 kg of water, their cross-sectional areas are AA = 0.1 m2 and AB = 0.25 m2 and the height h is 1 m. Find the pressur
The plate is heated over its total length to a temperature of 55 °C. The fluid velocity is measured 30 cm from the edge of the plate and found to be 22.5 m/s. Is the flow laminar or turbulent? Justify your answer.
The air above water is cooled as a result of the water absorbing heat from the air. The density of air is 1.29 kg/m3 and the specific heat of air is 1000 J/kg oC. How large a volume of air would be cooled by 1 degree Celsius if 1.57kg of water incre
Suppose that you save for retirement by contributing the same amount each month from your 25th birthday until your 65th birthday, in an account that pays a steady 6% annual interest, compounded monthly. How much will be in your fund at age 65, if
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